Questions tagged [tvs]

Transient Voltage Suppressors (TVS) are a type of semiconductor designed to protect against overvoltage situations.

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Why does the peak pulse current of a TVS diode decrease as the breakdown voltage increases?

From the above picture, we can see that the peak pulse current of a TVS diode decreases as the breakdown voltage increases. Why does that happen? Usually, when the voltage is high the current should ...
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Automotive Power Supply Input Filtering Design

i'm looking for some critique and pointers for the power supply and filtering design that I have come up with so far. This is a personal project that I have spent a couple of weeks on in my free time, ...
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OVP with crowbar + TVS?

I'm looking to design an over voltage protection (for > 13-14V situations) on the input of a power supply (the PS is taking input from a 12V vehicle). I was considering only using a crowbar circuit ...
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Growatt inverter TVS diode identification

I have a Growatt inverter which I re-connected incorrectly and it killed a few of my mosfets, which I have already identified, however I have a few TVS diodes which I am having a hard time identifying....
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TVS diode body touching

What is the electrical risk or impacts we could have if the Semtech RClamp3331Z2C TVS diode bodies in our PCB touch each other?
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Noise suppression circuits for a 120VAC motor

I am building a circuit for a relay that controls power to a 1000 watt pump motor. I want to do what I can to reduce noise and failure of the circuits from transients etc. Here is my schematic: I ...
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Why are regular diodes designed with ideality factors \$n\gg 1\$

(The question is at the end of the text.) In have a recurring application, where I want to clamp ESD strikes into a sensitive high-impedance into a guard node using antiparallel diodes. simulate this ...
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Do TVS diodes have polarity?

I am making a USB to UART circuit for ESP32. Why does the LESD5D5.0CT1G datasheet show a polarity marking? Aren't TVS bidirectional? What is the right position for such a diode? My circuit:
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Should there be ground vias on a TVS diode GND if positioned right next to a DC jack?

Say you have a TVS diode which is right next to the DC jack, would you want to have ground vias around the GND pad of the TVS diode, or would you want to avoid vias here because the current would just ...
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Identify TVS diode model

I guess that's a TVS diode, but I can't figure out what model it is. I tried to search on Google for 'z749' but there were no results. It's from an Einhell 18v battery board.
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Microcontroller Power Transient Voltage Spike

First of all thanks for even taking your time to read this question. We are hoping someone can help assist us with an issue we have been having. We are currently working on an automotive tail light ...
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What breakdown voltage of TVS diode should I choose for circuits interfacing with vehicle 12V battery?

I want to add ESD protection on my circuits that interface with vehicle 12V. My understanding is vehicle battery can reach up to 15V. Looking at , I can either pick 14.2V or 25V for min Vbr. I ...
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How to connect a TVS diode

I want to use a 824021 TVS diode in my circuit. The input is 5V and the clamping for tehe TVS diode is at 7V. Which of the following two connection diagrams is correct A or B? Or a better way to put ...
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How to find the lightning protection of a TVS diode?

I am using a STmicroelectronics ESD diode SMAJ58A-TR, which has a surge protection standard of IEC 61000-4-5, but they have not mentioned the value like 4kV, 6KV. While checking in datasheet they have ...
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Can a 3.3V power supply use the same type of TVS diode for the 3.3V and data lines?

I have a PCB with 3.3V data lines and power supply lines. Both require ESD TVS diodes. In the past I have used the same PESD0402-140 datasheet diode for both, but I feel like this is likely not a ...
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TVS diode why Vrwm should be above maximum operating voltage?

In my quest on how to select the relevant TVS diode, I came across this document. Page 3 paragraph 2.1, it is stated : Vrwm The reverse working maximum voltage (VRWM) is defined as the voltage that ...
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How long TVS diode lifespan?

Do TVS diode have a lifespan? Do TVS diode protect against how many lightning strike during own lifespan? Can ı calculate life expectancy? I don't found any document about this issue
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TVS Diode Exploded

So TVS Diodes are primarily used for ESD and EFT suppression not surges that have longer duration (for which you can use MOVs, etc.) What typically happens if the TVS diodes experience a longer surge? ...
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ESD protection on floating circuit - Capacitor from circuit ground to earth?

I'm not very familiar with proper ESD protection and wondering about the correct implementation of a TVS diode to protect an input of an isolated circuit. In the case of an ESD event into the ...
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Polarity of TVS diode is unclear

I have a question regarding the DESD1LIN2WSQ TVS diode by Diodes Inc. which I want to use to protect some 24V IOs of a microcontroller board. Until now, the TVS diodes I worked with always had the ...
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Role of CAN bus protection circuitry

Here is CAN protection circuitry as suggested by MORNSUN in their datasheet of CAN transceiver with integrated power. I have few questions regarding few components used there: What is the purpose of ...
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Buck converter - Maximum VIN of IC vs Maximum clamping voltage of TVS diode

For the circuit below which uses a LMR14050SDDAR buck converter from Texas Instruments. The absolute maximum VIN of the IC is 44V, and the capacitors are all of 50V. In practice VCC can be 36VDC ...
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Difference between ESD and TVS diode?

What is the difference bweteen TVS diode and ESD. Though both of the functions are the same, which do we need to choose for what application?
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Communication Line Protection

I intend to protect a BUS switches ICs, whose voltage on its pins cannot exceed 5.5V and 3.3V. The current cannot exceed 16mA. The circuits needs to opperate from 3.3V to 5V. But automotive ...
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What is 16A TLP in ESD diode and how it determines the clamping voltage of an ESD diode?

Please explain the meaning of 16A TLP in ESD diodes? Is the clamping voltage determined at 16A transient current flowing through diode? Please see the table in the below picture:
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unsure of TVS validity, can someone possibly confirm?

I have designed a MDD SD03 across a 3v3 supply. The 3v3 is being carried through a cat5 cable via an RJ45 socket. I assume this is totally fine, although can someone who knows about these devices ...
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What makes signal lines hot swappable?

In MAX14780E datasheet, it's explicitly featured as "hot swappable", however in AM26C31 datasheet this isn't mentioned. Moreover, I suspect that I burnt one of the AM26C31 ICs while hot ...
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what's the use of this passive RC filter

I was looking through the design of this board, which uses ADS1299 for measuring EEG signals. EEG signals have a freq band of usually about 5-100Hz and they are low in their SNR as well. Before the ...
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Choosing TVS diode

We have a a project where there a system powered by 13s Li battery - 54.6V max voltage of pack. The buck regulator we're choosing for this has an absolute max of 76V. For this we're considering two ...
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Transient protection (TVS), for back to back N-channel MOSFET switch with user-accessible connections?

I am designing an electronic power switch device which can be placed inline between a power source and a load (e.g. a charger and a battery, or a battery and a load). It needs to be biderectional (i.e....
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Regulator input overvoltage protection

I am using a 2A Buck regulator from TI (https://www.ti.com/lit/ds/symlink/tps562202s.pdf?ts=1622136131438&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTPS562202S), with max input voltage ...
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My ESD diodes on some specific lines are dying inconsistently

I made a PCB with 2 connectors for display connection. On one connector are fast signals (SPI + some more signal for display control (reset, A0,...)) and the second connector has signals for 4x ...
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How to combine transient voltage TVS diode and overvoltage Zener diode for analog output?

How do I arrange my circuit so that the TVS diode can do its ESD/transient job, without being fried in the miswiring/overvoltage scenario? I have an analog 0-5V output that needs protection from ...
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Use TVS and zener diode on the same circuit

In order to protect against ESD and overvoltage at a charger input, I would like to know if it is recommended to use TVS and Zener on the same circuit, if so, what would be the configuration? The ...
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Is using a TVS diode better than using a parallel reverse-polarity protection silicon diode?

I want to add a reverse-polarity diode to my design. It has an input of 24 V (230 Vac to 24 V power supply) which is fed to a 24 to 12 V converter. I plan to draw up to 4 A from the 24 V power supply. ...
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Does a TVS diode provide adequate protection for an LCD screen powered from a car 12V outlet?

I fitted an LCD screen in my car and I want to power it, along with other devices, directly from the car's battery. The other devices are specifically designed for automotive use, but the screen, a 10....
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2 votes
2 answers
207 views

Series resistor on op-amp input

There is a related question similar to mine: Op Amp input protection, but I found this other configuration: where the series resistor is placed after the TVS diodes. What is its purpose? The input ...
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TVS/Bidirectional Zener for N-MOSFET Gate Protection

I am using a MOSFET to read a square wave, which usually ranges between -1 and 16 V. However, on occasion, the signal can reach values of -30 to 45 V. My current setup uses a Zener-protected STN3N45K3 ...
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TVS diode specs - clamping voltage lower than breakdown voltage?

Having read this app note (and a few others) and quite a number of TVS datasheets, I came across one that is bugging me a bit. All of the TVS datasheets that I have read so far describe the the ...
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TVS for CAN lines protection need to be bidirectional?

I'm using a line that is multiplexed to be used with digital 0-5V, 0-7V and CAN. I don't know very much about CAN swing voltages, so, I have some doubts: Need CAN protection to be bidirectional? If I ...
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Bidirectional TVS supressor instead of Snubber for Triac

I am planning on building my own smart home socket and I want to mainly control LED lamps. But of course I can't make sure that someone is not plugging in let's say a toaster into the socket. (Yes I ...
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TVS with low Vclamp margin

Thanks for your support in this forum. Currently I have a couple of PCB that I need to provide a double input power supply and transient protection. The specs for this couple of PCB are Vin= 9 to 17....
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Can I use a TVS diode as an EMI suppressor in long cables?

I'm using a microcontroller to do some things when I press pushbuttons, which are located 20 to 30 meters apart from the MCU. Should I use TVS diodes as EMI suppressors? edit - The EMI I'm mentioning ...
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RS422 - Hot swapping - fuse blowing up - tvs?

I have an issue with the following schematic: When I am doing a hot swapping on the RS422 (Local console) connector X1200, my fuse F1200 blow up. I have a TVS diode to protect against overvoltage on ...
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SMD Component blown in earphone circuit in S9 mobile phone - please help identify and how?

Hi all, I am trying to identify the components marked "MT" and "7" in the first picture. They are in the earphone circuit of a UK Samsung S9 G960F mobile phone. The repair company ...
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ESD protection to the ground or chassis?

How to add ESD protection diodes to all cables (I/O, positive, ground)(see pink box below). Should I connect them to the chassis or battery negative terminal? There may be some potential difference in ...
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Suppressing noise and ESD from relay into microcontroller

I'd like to read from a relay on a CNC machine with a microcontroller running at 3.3V, the wire will be 1-1.5m twisted pair from the micro to the relay and screwed in to a terminal. There's a lot of ...
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Circuit protection with TVS and polyfuse

I have a 36V system that has to be protected against 1000V surges as described by IEC61000-4-5. Some SMC TVS diodes are rated for this exact purpose and are able to conduct the surge pulses without ...
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ESD protection of an input button

I was asked to design a EMI-protected button. A schematic below. Let me explain all that stuff a C39 capacitor suppresses high voltages an R44 resistor limits the current coming from an ESD ...
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Can a unidirectional TVS diode leading to ground be replaced by a bidirectional one?

I only have bidirectional TVS diodes at hand, can I use one of those instead of D1 (unidirectional) in the diagram?
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