com 1-800-831-4242. These are very simple devices that are often real time savers. But when it is reverse biased above a certain voltage known as zener breakdown voltage or zener voltage or avalanche point or zener knee voltage the voltage remains constant for a wide range of current. Here we have a 5v rail, a resistor and a zener diode with a 3v3 reverse voltage. Jameco Part Number 36097VIS. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales. Zener diodes are primarily designed to regulate the output voltage of a power supply. 5V zener diode, Z1, is used to clamp VDD to 5. Suitable for use with high output single phase stator. Its characteristics are otherwise very similar to common diodes. Standard Zener voltage tolerance suffix A for 5 % tolerance. The computer "sees" boost by providing the map sensor with a 5 volt signal and based on the amount of pressure (or vacuum) the sensor is reading returns a voltage between 1. A zener diode voltage regulator is inefficient when the supply is used with equipment that draws high current. Tell us what product you were looking for and couldn't find. 5V (Red) and 12V (Yellow) You can also combine two or more batteries in series and get the sum of their voltage Make sure you are using a DC (direct current) power source such as batteries, wall transformers and PC power supplies. SMD Code Package Device Name Manufacturer Data Datasheet; AC SOT-23 BCW60C: Zetex (Now Diodes) NPN transistor: AC SOT-89 BCX51-10: Zetex (Now Diodes) PNP transistor. Darlington Transistors. 35V for Schottky diodes. Attractive die cast finned aluminum heat sink. Silicon diodes when conducting current forward reduces the voltage by. this has happened due to the usual 5V standby circuit blowing up which is now fixed and supplying 5v as it should I just need to replace this zener and transistor to see if psu works, if not its going to be IC101 and i will get the kit, dont want to spend out £40 on the kit if i dont need the IC's!. Parts Warranty: 90 Days. Solar Cells. 350mW, 45mA, Silicon Planar Zener Diode (AA Enabled) mmsz5221bt1 : 500mW 2. Available in both single phase and three phase. 1V across it. Zener Diodes Ideal for industrial, military and aerospace applications, our Zener diodes are hermetic, non-cavity, double-plug construction with category I metallurgical bonds. The diode consists of a special, heavily doped p-n junction, designed to conduct in the reverse direction when a certain specified voltage is reached. Zener diodes are useful for creating a reference voltage or a voltage stabilizer. 4GHz Dual-Mode WiFi+Bluetooth Antenn JG. Two basic methods for generating electricity from light, using photodiodes are photovoltaic and photoconductive operation. Free Next Day Delivery. 5V Fast Ideal Diodes in 3mm × 3mm DFN The LTC®4413-1 and LTC4413-2 each contain two mono - lithic ideal diodes, each capable of supplying up to 2. 8 we have a Zener diode regulator for a negative polarity power supply. As stated earlier, the relationship is extremely non-linear, and it will cause us a some grief when analyzing diodes. They are suitable for operation at temperatures ranging from -65°C to 175°C. 1V 10V 11V 12V 13V 15V 16V 18V 20V 22V 24V 27V 30V 33V 36V 39V 43V 47V) Assortment Set. Light-Emitting Diodes (LEDs) So if you have a 5V power supply and each of your LEDs have a forward voltage drop of 2. Shop our range of 7. Diode LED is the wholesale and manufacturing division of Elemental LED and is a premier wholesale supplier of LED lighting, providing a wide variety of linear, task, and accent lighting solutions for both residential and commercial applications. Parts Warranty: 90 Days. The computer "sees" boost by providing the map sensor with a 5 volt signal and based on the amount of pressure (or vacuum) the sensor is reading returns a voltage between 1. AI-2304-TF-LW120-5V-R offered from PCB Electronics Supply Chain shipps same day. 01 LCSC electronic components online Diodes Zener Diodes leaded datasheet+inventory and pricing. Related Items(0) Accessories(0) Reviews. April 7, 2013 Introduction A Zener diode is a PN junction that has been specially made to have a reverse voltage breakdown at a specific voltage. 5 mW up to 3 W. An internal 5V Zener diode with a , this diode. 3V zeners in the post. About 97% of these are Diodes, 3% are Integrated Circuits, and 0% are Transistors. LEDtronics is America's #1 premium LED lighting manufacturer, creating solutions for industries & customers globally. TVS diodes provide critical protection by going into avalanche breakdown within no more than a few nanoseconds after a strike, clamping the transient voltage, and routing its current to the ground. These diodes will waste less power and might reduce the size of your heatsink. Constructing the Circuit. 5mm (3/8 inches) from the diode body. 3V logic is preferred to 5V logic because it consumes less power, so most microcontrollers and peripheral devices use the lower voltage logic. 5v Zener Diode offers. For this example we will use V IN = 8V. org forums) - Had the ingenious idea to offset the LM317/LM337 internal voltage references by using a single 2. Diodes' Thyristor Surge Protection Devices (TSPD) provide lightning surge suppression for intra-building protection according to Bellcore GR-1089 and system-level protection according to IEC 61000-4-5. EE 201 diodes – 5 diode i-v characteristic i d + – v The ideal diode equation: d where i D is the diode current and v D voltage across the diode. UZ____ zeners are from Micro Semi. Rectifiers (530) RF Diodes (13) Schottky Diodes & Schottky Rectifiers (521) Silicon Carbide (SiC) Diodes (98) Small Signal Switching Diodes (158) Zener Diodes (691) Digital Transistors (BRTs) Gate Drivers. 5V - 30V) in: 12 Volts out : 24V Input : 24 Volts (10V-30V) in: 1. Each of the diodes has a capacitance of 500 - 620 pF at a reverse bias of 0. Our Price: $0. These inputs do not draw almost any current, therefore by Ohm's law the voltage measured on the other end of a resistor connected to 5V is always 5V, regardless the resistor's value. This power goes to a 6V lead acid battery in parallel with the panel, which is protected from overcharging by a 6. As a voltage regulator, a stable maximum voltage is allowed to pass through the diode. A Zener diode is an electronic component utilised in DC voltage regulator circuits. 5v Zener Diodes information. Part 1 of How to use Zener Diodes. Zener Diode Basic Operation and Applications. PRECISION TIMERS NE555/SA555/NA555 Operation is specified for supplies of 5V to 15V. 3V logic is preferred to 5V logic because it consumes less power, so most microcontrollers and peripheral devices use the lower voltage logic. Transformer less AC to DC power supply circuit using dropping capacitor Jaseem vp / July 19, 2012 Production of low voltage DC power supply from AC power is the most important problem faced by many electronics developers and hobbyists. LED diodes 2. Hi All I want to get all the standard values of Zener diode, which are available in the market. As the regulator, LM317 is used for the positive voltage and LM337 is used for the negative voltage. Let us see how we can select one for your application. 1 volts with Zener diodes are useful for creating a reference voltage or as a voltage stabilizer for low-current applications. A Zener diode may function as a voltage regulator by acting as an accessory load, drawing more current from the source if the voltage is too high, and less if. A Zener diode is a diode designed to operate in the breakdown region. Kim Laroux: (head-fi. Zener diodes conduct very little current in reverse voltage configuration below the 'knee' in Figure 3 and then shunt the rest of the current above its zener voltage (Vz). 5v zener diodes products. The Zener diode provides clamping at 5V for a positive VSENSE and at 600mV for a negative , limits the maximum Zener diode current to 4. The two diodes coloured red are referred to as the "blocking diodes", one in series with each series branch. Low current consumption of the APC circuit 3. Interfacing 5V and 3V logic circuits is a common task. Kuhn April 3, 2009, rev. Transient-voltage-suppression (TVS) diodes are specialty diodes, kind of like zener diodes -- lowish breakdown voltages (often around 20V) -- but with very large power ratings (often in the range of kilowatts). Chanzon 1W Zener Diode Assorted Kit (30 Values x 10pc 3V 3. Can I use some signal diodes in series to drop 5V serial to approximately 3. 1V Zener, 6. Check our stock now!. 5 Watt Zener diode. A third terminal on the LM136-2. Zener Diode An alternative option is to use a zener diode to clamp the input voltage, as shown in Figure 2. Diodes & Rectifiers. The transistor cuts off and V OUT goes high. By purchasing these diodes you are agreeing to the following. Solar Cells. Save on Semiconductors & Actives Trending price is based on prices over last 90 days. 1 volt zeners I would say it is down to physics. see CAPTURE-3 Any idea on that problem?. We will then plot it to get the depen-dence. 2V right up to 12v that you could connect in such a way that if over voltage occurred, then the relay would automatically switch off the output preventing damage to any connected equipment. During normal. The circuit could be arranged in such a way that the diode would allow voltage in excess of it’s nominal vz into the gate of the npn transistor. Adafruit Industries, Unique & fun DIY electronics and kits 1N4001 Diode - 10 pack ID: 755 - This here is a 10 pack of the classic 1N4001 power blocking diode. I have searched in the web, but there is no proper answer for my question. Explain the reason why both the input and the output are the same (2 points) In this circuit, diodes D2 and D3 will turn on when the voltage tries to go above 1. In normal operation, the Zener diode operates in the "reverse- breakdown" mode, in which the reverse voltage is. Much smaller LD module 4. If we need a OR gate we can use a 4071 OR CMOS IC or a TTL 7432 OR IC. First, a the "5V" pads must be cut apart, as in option #1 above. Obtaining Pure DC from Pulsating DC. 5v zener? Find it and more at Jameco Electronics. Two basic methods for generating electricity from light, using photodiodes are photovoltaic and photoconductive operation. 0C-E3/9AT at Jotrin Electronics. 5V Zener Diode Axial Lead. The voltage from a half-wave power supply is applied to a resistor R and a Zener diode connected in series. ) Power Supply Decoupling (CS) The PAM8302A is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output THD and PSRR as low as possible. 5V offered from PCB Electronics Supply Chain shipps same day. But, due to the internal resistance of the diodes a voltage drop of (2*0. CHAPTER 5 Voltage Regulator In your robot, the energy is derived from batteries. Interfacing 5V and 3V logic circuits is a common task. First, a the "5V" pads must be cut apart, as in option #1 above. A bidirectional transient-voltage-suppression diode can be represented by two mutually opposing avalanche diodes in series with one another and connected in parallel with the circuit to be protected. A third terminal on the LM136-2. 5v Zener Diodes information. The schematic symbol for a Zener diode is shown above– it is very similar to that of a regular diode, but with bent edges on the bar. · Prompt Responsiveness · Guaranteed Quality · Global Access · Supply Chain Solution Worldway, the world's largest source of Hard-To-Find parts. Using fuses alone does not solve the problem because a fuse may take several milliseconds to blow off and that's enough time for the IC to get damaged. Too large and your useful current drops. This is because voltage in parallel is equal. April 7, 2013 Introduction A Zener diode is a PN junction that has been specially made to have a reverse voltage breakdown at a specific voltage. 5v zener diode options are available to you, such as package type, type. Since different circuits in your robot require different voltage. Those numbers refer to the surface area of the SMD (Surface Mount Diode). 5V, Ideal Diodes in 3mm × 3mm DFN The LTC®4413 contains two monolithic ideal diodes, each capable of supplying up to 2. 7 out of 5 stars 88. n If any input goes low, the base current is diverted out through the input diode. Zener Diode An alternative option is to use a zener diode to clamp the input voltage, as shown in Figure 2. Mitsubishi Electric Semiconductor is the leading source for a well-balanced portfolio of semiconductors. com offers 179 0. In this circuit diagram, the unregulated input voltage is V S , and the regulated output voltage across the load is "V L ", which is the same as that across the diode. Zener diodes are useful for creating a reference voltage or a voltage stabilizer. Mouser offers inventory, pricing, & datasheets for 5 V Zener Diodes. Water proof and vibration resistant. By purchasing these diodes you are agreeing to the following. LEDs, or light-emitting diodes, are tiny light bulbs that fit easily into an electrical circuit. General Purpose and Low V CE(sat) Transistors. This effect is known as the Zener effect, after Clarence Zener,. Diode LED is the wholesale and manufacturing division of Elemental LED and is a premier wholesale supplier of LED lighting, providing a wide variety of linear, task, and accent lighting solutions for both residential and commercial applications. This 1N4733A zener diode is set at 5. The voltage from a half-wave power supply is applied to a resistor R and a Zener diode connected in series. 1V across it. Instead, I recommend adding a single 5. Zener Diode Basic Operation and Applications. · Prompt Responsiveness · Guaranteed Quality · Global Access · Supply Chain Solution Worldway, the world's largest source of Hard-To-Find parts. A Zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. Let us see how we can select one for your application. The Zener diode ratings that are needed to design a voltage regulator include the power dissipation rating, the minimum knee current rating, the maximum current rating and the Zener voltage. 5V zener diode. Diode-Transistor Logic (DTL) n If all inputs are high, the transistor saturates and V OUT goes low. 3V, then they are using a zener diode for input protection and that the *input pin* part is 5V tolerant. A Zener diode may function as a voltage regulator by acting as an accessory load, drawing more current from the source if the voltage is too high, and less if. exceed either the Zener diode's power rating or the maximum VDD for the PICmicro MCU. 5V Zener Diode Voltage Regulator. ) The 10 kΩ load draws only 0. comAnnouncementNew ProductZXRE250/2Issue Number │001May 2011The Diodes advantageCircuit functions§Isolated power supplies datasheet search, datasheets, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes and other semiconductors. EE 201 diodes – 5 diode i-v characteristic i d + – v The ideal diode equation: d where i D is the diode current and v D voltage across the diode. Super Bright LEDs warehouses are centrally located in the U. Try a partial part number. 5V Zener Single Diodes distributor. Engineers and designers need to consider which protective components to use to ensure survivability. There is a potential barrier from Ec on the n-side to the Ec on the p-side, called the built-in voltage, V0. CHAPTER 5 Voltage Regulator In your robot, the energy is derived from batteries. This 5mm blue LED has a clear-color lens. If your order is placed Monday through Friday before 3 p. Zener Diodes Ideal for industrial, military and aerospace applications, our Zener diodes are hermetic, non-cavity, double-plug construction with category I metallurgical bonds. On our site you will find a wide selection of rectifier, switching, Zener, Schottky and photo diodes at great prices. Order Now! Discrete Semiconductor Products ship same day. 5V and 22 pF at 8V. Correct Use Of Diodes In Car Stereo Electrical Engineering Stack Wiring Diagram Online,correct use of diodes in car stereo electrical engineering stack wiring diagram basics, correct use of diodes in car stereo electrical engineering stack wiring diagram maker, create correct use of diodes in car stereo electrical engineering stack wiring diagram,. Assuming a 5. We first must choose a zener diode, V Z = 4. An output voltage of 5V is required and the output current required is 60mA. The Philips BB212 in a TO-92 case is one such type. The diode consists of a special, heavily doped p-n junction, designed to conduct in the reverse direction when a certain specified voltage is reached. 3V buffer with 5V tolerant inputs. The main question I have is: I have built what nevdull shows using my breadboard with a 3. 3W, BZX85 series were the zener voltage is given as, for example, C7V5 for a 7. The Si diodes such as 1N4148 can't handle the several hundred milliamps that the player will need. The options above always run the Teensy processor from the external power. RU 1BV1 offered from PCB Electronics Supply Chain shipps same day. A Zener diode is an electronic component utilised in DC voltage regulator circuits. The reverse direction of current flow is allowed if the voltage is larger than the breakdown voltage (or "zener voltage"). Regulation of a specific voltage output ensures electronic equipment. This effect is known as the Zener effect, after Clarence Zener,. tl;dr It sound like it is 5V tolerant, but you really should direct the question to the vendor. 3v? I know I need bidirectional level shifting but wouldn't the voltage be clamped to 3. 3V zeners in the post. Convert 12v to 5v using Zener Diode! S. * Product Images are shown for illustrative purposes only and may differ from actual product. If you want to limit your circuit to 5V, then use a zener diode with a breakdown voltage rating of 5V. Each of the diodes has a capacitance of 500 - 620 pF at a reverse bias of 0. Find great deals on eBay for 5v zener diode. 8V Zener, 7. The Zener diode provides clamping at 5V for a positive VSENSE and at 600mV for a negative , limits the maximum Zener diode current to 4. Zener diode is nothing but a single diode connected in a reverse bias mode and Zener diode can be connected in reverse bias positive in a circuit as shown as picture. If you want to limit your circuit to 12V, then choose a zener diode with a breakdown voltage rating of 12V. Zener diodes have been designed to work reliably in the breakdown region, unlike normal diodes which would overheat. 1) do not use any bias voltage applied to the diode, but in photoconductive operation (Fig. Tell us what product you were looking for and couldn't find. The computer "sees" boost by providing the map sensor with a 5 volt signal and based on the amount of pressure (or vacuum) the sensor is reading returns a voltage between 1. Jameco Part Number 36097VIS. Each of the diodes has a capacitance of 500 - 620 pF at a reverse bias of 0. The circuit symbol of Zener diode is as shown in the figure. Zener Diodes Silicon Axial Voltage Reference Military Siemens Fairchild Westinghouse 1N4737A 34mA 7. 1V 10V 11V 12V 13V 15V 16V 18V 20V 22V 24V 27V 30V 33V 36V 39V 43V 47V) Assortment Set. THE FIX The Ruggeduino has its reverse-blocking diode right at the 5V regulator input, ensuring that no current can flow backwards through the regulator, even if a circuit is connected to the Vin pin. Photodiode Families. You can get additional TVS Diode selection guidance by visiting the TVS Diode definition and selection page by clicking here. Two per package. These diodes are rated for 5. Instead, I recommend adding a single 5. Click on the source link I posted below. 5V-1W Zener Diode. 5V Zener Diode 3% 500 mW Through Hole 2-Pin DO-35 TZX5V6C-TR or other Zener Diodes online from RS for next day delivery on your order plus great service and a great price from the largest electronics components. However if you want to drive this from an Arduino which is running at 5V, you will need a “logic-level” MOSFET. 3v ok ok no ok ok b b. 7 volts for silicon diodes and 0. Littelfuse TVS Diode Arrays (SPA ® family of devices) are an ideal choice for suppressing ESD and other electrical transients as their speed and clamping levels are essential to protect today's integrated circuits. Much smaller LD module 4. The Zener diode works well if the supply resistor stays within the current draw parameters. 5V to 36V) 12 Volts out: 12 volts (10. A high efficiency switch is included on the die along with the catch diode, boost diode, and the neces-sary oscillator, control and logic circuitry. Top of Page. The transistor cuts off and V OUT goes high. Part 1 consists of a demonstration of Standard diodes vs zener diodes and how they work to regulate voltage. The Zener diode provides clamping at 5V for a positive VSENSE and at 600mV for a negative , limits the maximum Zener diode current to 4. 0C-E3/9AT VISHAY , Learn more about SMCJ5. Free Next Day Delivery. VS-10BQ040-M3/5BT offered from PCB Electronics Supply Chain shipps same day. This is well within the voltage specification for PIC® microcontrollers. For AM Radio band applications a specific diode has been devised. I am using the 3 terminal voltage regulator for the voltage to be changed in this unit. Click on the source link I posted below. The schematic symbol for a Zener diode is shown above– it is very similar to that of a regular diode, but with bent edges on the bar. 3V at 115Kbs? Would they be fast enough and reliable enough? This would only be in the short term (a couple of days experimenting on a bread board) as I have some 3. This will also provide over-voltage protection for the micro-controller. LCD modules Domestic market: 5. 1N4 Silicon Power Zener Diodes. 3v ok ok no ok ok b b. 4GHz Dual-Mode WiFi+Bluetooth Antenn JG. The diode consists of a special, heavily doped p-n junction, designed to conduct in the reverse direction when a certain specified voltage is reached. The depletion region extends mainly into the p-side. VS-10BQ100-M3/5BT offered from PCB Electronics Supply Chain shipps same day. Qty Available: 108150. org forums) - Contributed the key idea to use a LM336 voltage reference, instead of a zener diode, to compensate the LM317/LM337 internal voltage references. The constant reverse voltage of the zener diode makes it a valuable component for the regulation of the output voltage against both variations in the input voltage from an unregulated power supply or variations in the load resistance. 5W value: For 0. (MACOM) and its affiliates reserve the right to make changes to the product(s) / process(s) or information contained herein without notice. How to select a Zener Diode: A Zener diode is another form of diode, but is used for entirely different purpose. 845 V and a maximum voltage of 5. 5V Zener, 15V Zener. 1V Zener Diode. published 5 years ago add comment in editor. I am unable to try Ians suggestion as I am unable to edit any of the diode properties unless there is another way of doing it. These are very simple devices that are often real time savers. Diode LED is the wholesale and manufacturing division of Elemental LED and is a premier wholesale supplier of LED lighting, providing a wide variety of linear, task, and accent lighting solutions for both residential and commercial applications. Zener Regulator. It was a monolithic oscillator specifically designed to flash Light Emitting Diodes. These conditions destroy normal diodes, but a Zener conducts a small amount of current. 7V which is the nearest value available. This is the new version of the single LED series resistance calculator, good for when you have a single LED and need to know "what resistor should I use with my LED?" This calculator determines that for you. Findchips Pro offers complete visibility on the sourcing ecosystem and delivers actionable insights to supply chain, engineering and business teams. In case of an overvoltage due to failure of the regulator, it causes a short circuit which blows the fuse. In reverse bias, there is no current even if you increase the voltage… until its so high that the barrier breaks down. 1 μF 470Ω C1 R1 VSS PIC® MCU A simple, low-cost 3. * Product Images are shown for illustrative purposes only and may differ from actual product. We are offering PAM8016AKR for competitive price in the global market, please send us a quota request for pricing. com August 2018 Diodes Incorporated PI3USB102G Document Number DS41285 Rev 1-2 DC Electrical Characteristics for USB 2. This is where by-pass diodes come into play as shown in the diagram to the right. The options above always run the Teensy processor from the external power. Email to a Friend. Chanzon 1W Zener Diode Assorted Kit (30 Values x 10pc 3V 3. 4V occurs and thus, the peak voltage of the rectifier circuit is around 15V (17-1. 5KE51A, TVS - Diodes, TVS DIODE 43. When the anode voltage gets more than about 0. 1V, making it ideal for protecting the inputs of a 5V circuit. Its characteristics are otherwise very similar to common diodes. A TVS diode will be connected directly across a supply rail (+5V or +12V), sometimes with a series inductor, fuse, polyswitch, or zero-ohm resistor. If a Zener diode is reverse biased, it will generate a very specific voltage drop across its leads. For this example we will use V IN = 8V. 1 zener will clamp the voltage to safe level. A third terminal on the LM136-2. They are mainly used in protection circuits or as crude voltage regulators. By purchasing these diodes you are agreeing to the following. Some common marking codes for 5V diodes are HE, QE, QA, AE, 5L. 0V with 2% regulation. How to select a Zener Diode. published 5 years ago add comment in editor. 5-N allows the reference voltage and. A Zener diode is a type of diode that allows current to flow not only from its anode to its cathode, but also in the reverse direction, when the voltage across its terminals exceeds the Zener voltage, a characteristic of the device. General Purpose and Low V CE(sat) Transistors. The Zener still conducts electricity in the forward direction like any other diode, but also conducts in the reverse direction, if the voltage applied is reversed and larger than the Zener breakdown voltage. Email to a Friend. Voltage that appears from the tap on the inductor to the collector causes the voltage on the 1K resistor to be even higher than the battery voltage,. 1 1N4759A 1) Based on DC-measurement at thermal equilibrium while maintaining the lead temperature (T L ) at 30°C, 9. The transistor, 1K resistor and the tapped inductor form a blocking oscillator. Two per package. Standard Zener voltage tolerance suffix A for 5 % tolerance. The diodes coloured green above are "bypass diodes", one in parallel with each solar panel to provide a low resistance path. These diodes are rated for 5. Discrete Semiconductor Products – Diodes - Zener - Single are in stock at DigiKey. VS-10BQ100-M3/5BT offered from PCB Electronics Supply Chain shipps same day. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales. I'm trying to use zener diodes to protect the inputs to an IO driver chip (Microchip MCP23017) The IO chip runs off 3. RF Transistors. How to select a Zener Diode. Competitive prices from the leading 2. The 1N4148 and 1N4448 are high-speed switching diodes fabricated in planar technology, and encapsulated in hermetically sealed leaded glass SOD27 (DO-35) packages. Item# 1N2971A. 1 volt zeners I would say it is down to physics. 1V Zener Diode. The voltage from a half-wave power supply is applied to a resistor R and a Zener diode connected in series. 3v nmos lsi 4000b, 74c @5v 4000b, 74c @10v ttl ok ok a ok ok a b hct, act ok ok ok no ok ok b hc, ac ok ok ok no ok ok b hc, ac @3. The long answer: LEDs are semiconductors, diodes in particular. 7 out of 5 stars 88. Not finding what you are searching for. Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. KT88: (head-fi. "'Zener diode' and 'avalanche diode' are terms often used interchangeably, with the former much more common.