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Questions tagged [tvs]

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

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Voltage and current on two identical TVS diodes in parallel during a voltage spike

Suppose I have two identical unidirectional TVS diodes (A and B) connected in parallel to a voltage source and suddenly a voltage spike occurs (spike voltage > voltage clamp of the TVS diode specs ...
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Relay controlling DC motor welding shut

I am controlling a fairly large DC motor using a relay. The motor draws approximately 7A at 36V. I am controlling it with a relay rated at 110VDC, 50A. To protect against back-EMF, I placed a ...
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Identifying SMD diode - markings ST e3 G (next line) DUK (next line) G3 635 (or b35)

I am trying to identify the following diode. I can see it says DUK G3 but am unsure on the last part, if it’s meant to be 63S or b35 or something like that. I’ve tried multiple Google searches and can’...
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Does the unidirection TVS diode like SMAJ15A be used on DC lines to protect the IC or Converters from negative Peak, clamp down to -0.6V?

Most of the DC- DC converters have absolute maximum down to -0.6. If bidirectional TVS diode is used then negative peak cannot be clamped near to -0.6v, in this is the case can we use the ...
Raviteja Cherukuri's user avatar
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Ensuring Proper Damping and Protection at Power Connector Inlet

I am designing a power input stage for a system (which consumes up to 90W) and want to ensure it is properly damped and protected. Here are the components and considerations I have incorporated so far:...
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3 votes
2 answers
292 views

Correct Implementation of Flyback Diode, TVS Diode, and Snubber Circuit for Buck Converter?

I am fairly new to circuit design. I was wondering if I have correctly implemented the TVS diode (D8), flyback diode (D6) and the snubber circuit (R20 and C41) for this buck converter. I apologize in ...
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Questions regarding TVS-diodes and grounding

I am currently working with solutions to pass the ESD-requirements for EMC. I have used TVS (ESD)-diodes in the past to good result, but never really understood exactly why they work. Sadly, this is ...
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What does back-back mean in the context of TVS diodes?

I am making the schematic of a 24 V power supply regulator using the LM74900-Q1 IC. When selecting the TVS diodes, I found the following design suggestion in the datasheet of another IC (LM74800-Q1) ...
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Easy Overvoltage and Reverse polarity protection circuit

I'm looking for the simplest and most effective way to add an overvoltage and reverse polarity protection network to a signal line connected to an MCU, the maximum allowable voltage at the MCU pin is ...
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What circuit protection devices are needed for an automotive application? [closed]

I am designing a circuit for a automotive application which is meant to map voltage ranges between two sensors (ex. 1 sensor has an output range of 0-5V while the other has a output range of 1.75-7.0V)...
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Suitable TVS diodes [closed]

I have a circuit on an old bit of equipment that keeps ending up in our telecoms workshop,my colleague thinks this is from surges, the system has a 12v 5A supply, the circuit has 5v and 3.3v rails, as ...
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1 answer
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Overshoot at powerline

I had a problem with a bunch of series connected electronics devices containing microcontrollers. At seemingly random times the microcontrollers in the PCBs broke. The rest of the circuit stayed ...
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2 answers
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Identify TVS: SMC package, GEM 88A

I have this TVS installed on some CCAs. It is not marked like the correct part. The correct part is marked GEM 15A as opposed to this part which is marked GEM 88A.
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Bidirectional TVS between field ground and analog ground

I'd like to know why this circuit has a TVS diode between both grounds. The field ground is the physical ground used in the circuit and the analog ground is used for 6 analog signals (between 4 and ...
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TVS diode: max breakdown voltage

Source: Vishay SMBJ36A-E3/52 datasheet I understand the standoff voltage of the TVS diode. The breakdown voltage is said to be the point at which it starts flowing significant current, around 1mA. So ...
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TVS Diode current flow at breakdown

This was a question asked to us by our client.The question is 'We have a TVS diode with a break down voltage of 31V.When a pulse of amplitude 31.7V and a duration of 100ms second is applied the diode ...
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Handling higher clamping voltage of IsoMOV - MOV/GDT Hybrid

I'm working on an ac mains control circuit and came across IsoMOV a new hybrid MOV/GDT for surge suppression. This appears to be a straightforward replacement for a standard TPMOV with additional ...
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How to select ESD TVS diode? [closed]

This is the following specification of my circuit Vin 8V to 32V The breakdown voltage should be 33V of TVS I don't know what clamping voltage means please simplify it for me What should be Vc?
Monesh Rathod's user avatar
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1 answer
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To which ground should TVS or ESD diodes connect?

I am designing a circuit with both signal ground and earth. As far as I know, a TVS should be connected to the earth. What if there is a huge voltage different between the ground and the earth? Let ...
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Protecting IC in the event of SCL and SDA short circuit

I am looking for a circuitry to protect an IC in the event of a short circuit between SCL and SDA lines. I am considering using TVS on both SCL and SDA to GND. Would that be sufficient? The power ...
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Ferrite placement with TVS and capacitors

I have to connect some capacitors (1 nF) and TVS diodes after inserting some ferrites as in the figure below. I wonder if it might be the same to connect the capacitors and TVS before the ferrites, ...
Alinik's user avatar
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Operation amplifier input HV protection

I have a setup consisting of 8x AD8428 ultra-low noise opamps on a PCB to measure very small voltages with a noise floor of around some 100uV and a low-pass filter up to 10kHz. The input is connected ...
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Can TVS diodes interfere with I2C communication?

I'm dealing with an application where our microcontroller is communicating with a slave device over I2C at 100 kHz fairly close to the MCU (less than 10 cm). Everything works fine, but once we include ...
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Best power supply configuration

I'm making a power supply board with a buck converter for a 2A maximum and I would to know which is the best configuration between these two: Is it best to put the input filter, a parallel damped LC ...
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2 answers
257 views

TVS2201 clamping diode failed at 27 V

In the development of ESD protection and reverse polarity, I encountered a problem. The circuit is supposed to prevent reverse polarity (it does, we tested it). During testing, I applied a voltage of ...
douce's user avatar
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1 answer
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ESD protection when reverse stand-off voltage and required clamping voltage are close together

The circuit under consideration is to be powered by four 18650 li-ion cells in series. These cells are in a holder and user replaceable so there is risk of the contacts being touched and adding esd ...
Unimportant's user avatar
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Using of TVS diode in series and parallel

This is an automotive system. The "LM2594M-5.0" input is from capacitor(Vout).an valve will be switch ON/OFF periodically(this valve has +24VDC/max1A). i think TVS1 is used for reserse ...
EM_KH's user avatar
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104 views

Contactor circuit where MOSFET fails short

The following circuit has been designed to drive a contactor. In addition to the primary relay the contactor has a secondary auxiliary (AUX) relay that can be used to latch the contactor on. The ...
FlybackDiode's user avatar
2 votes
1 answer
109 views

TVS Diode Transient Response to Surge and Current

I want to simulate the transient voltage response of a TVS Diode against a surge using an exponential voltage source with this characteristics: Initial value 0V Pulsed value 100V Rise delay time 0s ...
marcosbc's user avatar
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How should I choose TVS diode capacitance for my 2MHz RS-422 application?

I have been looking at which TVS diode to select for a protecting a set of RS-422 driver lines, however I am struggling to understand how to choose them based on the diode capacitance. The signal will ...
Friizzle's user avatar
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1 answer
173 views

USB series resistors

I have 2 questions: The USB differential pair D+/D- are impedance-controlled 90 Ohm transmission line.. Why do I need to put a 22 Ohm series termination resistor in it? Isn't that a discontinued ...
Abd Alhaleem Bakkor's user avatar
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1 answer
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Need help in identifying SMA package component

I have a problem with identifying a certain element in the SMA housing, which in my opinion has a marking that is inconsistent with what is given in the datasheet (the datasheet which I selected based ...
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Alternatives for routing two pinouts to the same RJ12

I’m working on a project that is basically UART, power and a couple of I/Os over a RJ12 connector. I want to be able to interact with two different devices that have the same interface but with ...
evading's user avatar
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1 vote
1 answer
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EN61000-4-5 Surge protection of PCB power supply

I am trying to better understand how EMC testing is simulated and passed. The datasheet of the CQB50W12-72S12 says it pass level 4 line to earth 4kV; and +- line to line 2kV with just a TVS diode (...
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107 views

Overvoltage protection for ESP32 (3v3)

I am trying to desing a switching regulator power supply for esp32 s3 (3v3). this is my schematic, I am using PAM2310 for switch regulator. I have tested it works fine. But sometimes I am thinking, ...
mehmet's user avatar
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7 votes
3 answers
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Unidirectional or Bi-directional TVS diodes - Which one to use?

I would like to understand in which places one should be using a unidirectional TVS diode and a bi-directional TVS diode. In the USB power line, VBUS (5V), is it enough to place an unidirectional TVS ...
Freshman's user avatar
1 vote
1 answer
254 views

Is this symbol a TVS diode, and what is the purpose of a TVS diode? [closed]

I'm looking at two similar diodes in a wiring diagram. These diode symbols do not match any of the common diode symbols. The purpose of D2 seems to be pulling to ground. These diodes somewhat resemble ...
Gray's user avatar
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1 answer
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Digital Input Voltage range selection

I am designing 24V industrial shields with 4 channel Digital Inputs. the digital inputs voltage range shall be set by 1P3T switch wherein the switch shall be actuated between 3 voltage ranges of 0-24V,...
priya's user avatar
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6 votes
3 answers
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Why use a steering diode with a TVS for ESD protection?

Take this SR05 for example. The data sheet explains that you can use it with or without a reference voltage at pin 4. So why have the steering diodes at all for ESD protection? Is it to ensure that ...
BobaJFET's user avatar
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0 answers
153 views

TVS diode to protect 12V circuit

I have a simple 12V circuit with PIR, 555, couple of transistors and an outside 220mA LED light in a circuit powered from a 12V lead acid battery battery with long leads so am expecting LC spikes that ...
codebrane's user avatar
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0 answers
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TVS on 5V external input

I am transferring 5V ext. through a robot which is a faraday cage of sorts. the line will be around 1.2 meters (4 feet). will the TVS be good for this application? or should I consider a different ...
Nightshade's user avatar
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Question of Ethernet PoE and TVS protection [duplicate]

My question is based on this question over here Asking this question here since I didn't receive a clear answer that clarified my confusions on TVS for PoE applications. As far as I understand, the ...
Freshman's user avatar
0 votes
3 answers
155 views

Difference clamp and clip circuit

What is the difference clamp circuit and clipping circuit? TVS diode clamp property and clamp circuit is same or not? I am confused because of some pictures. Please explain this confusion. This is TVS ...
bb0667's user avatar
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1 vote
1 answer
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Why clamping voltage is not given for some ESD diodes

I was comaparing two ESD diodes.Their P/N's are PESD5V0S1BL,315 and PESD5V0U1BL,315. If you check the datasheet of both parts you can see that clamping voltage is specified for PESD5V0S1BL,315 and ...
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What is this IC marked A6505 01230?

Can you help me find this IC marked A6505 01230?
HNLinh's user avatar
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2 answers
109 views

TVS diodes clamping voltage against waveform and current

Having come across these two datasheets, two patterns might be inferred: Clamping voltage increases with current: https://www.tme.eu/Document/edf5842caa2ca49fd1e87fde0a7b9438/sts32xxxxuxxx.pdf ...
kellogs's user avatar
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1 answer
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Vishay TVS diode identification

I'm trying to identify a TVS diode. It's from Vishay with the markings 200C 8CA. That's where I can't quite confirm what it is.
AreoMaxx's user avatar
3 votes
1 answer
89 views

Maximum power of a TVS

I am trying to understand how much power a SMDJ58CA TVS can handle during a very short moment (~ 20 µs.) The information into the datasheet are the following: The peak pulse power rating @ 25°C for a ...
Jess's user avatar
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How to select a TVS Diode for LM74700

lm74700 I looked into the basics for a TVS diode; the important factors that needed to be considered are the breakdown voltage i.e. when the TVS diode becomes 'visible to the rest of the circuit or ...
Harkirat's user avatar
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3 votes
1 answer
161 views

Can swap trace layout of differential pair through TVS/ESD component?

Im using 2 x TPD4EUSB30 to do TVS/ESD protection for the 4 differential pairs for a RJ45 ethernet jack. To make some upstream routing a little easier I want to swap D1- and D1+. Looking at the ...
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