Questions tagged [tvs]

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

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18 views

What is the best TVS/ESD protection for Wheatstone bridge circuit?

I have 150K ohm on three legs of Wheatstone bridge, one leg on human body (skin), bridge excitation voltage is 5V, differential amplifier is be used to read the differential voltage of the Wheatstone ...
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41 views

How to choose TVS/ ESD for sensitive application?

I am using ad8232 ECG with 3 electrode configuration, Edited ad8232 used schematic I need to protect circuit from any voltage more than 5V, since ecg measure only around 300mV with common mode signals....
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42 views

Varistor and TVS diodes in series

In the picture below, the input of the rectifier is 690VAC max, so the DC output can reach up to 1kVDC. The DC output goes to a low power DC/DC Converter. In the picture on the left, I'm using a ...
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51 views

ESD Protection for 1Gb Ethernet pre-magnetics able to withstand PoE?

I am looking for suggestions on protecting a gigabit ethernet port from ESD between the jack and the magnetics. Due to the nature of the equipment design, the magnetics cannot be placed next to the ...
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55 views

Difference between placing unidirectional TVS diode before fuse or after P mosfet

In the buck-boost converter I am finishing, I came out with this question. At Vin (12V in my circuit) I place a 7A fuse and a P mosfet (IRF5305) to prevent reverse polarity issues. Because I want to ...
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34 views

Are TVS diodes necessary if device is not grounded? (i.e. portable)

If I'm working on a battery powered device that has no connection to ground, is it still necessary to guard against voltage spikes?
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60 views

TVS diode for RS485

I'm studying the ISO1500 for an RS485 application. In particular, I'm looking for a TVS diode for bus protection. I've found that a common TVS diode used for RS-485 applications is the SM712 (like ...
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53 views

Is there a limit of how many times I can hit a TVS diode with an overvoltage?

I have a system that is powered by 2 batteries that are OR'd together through 2 diodes. They are powering up a speed controller that drives a motor. Right now, when my motor brakes, I am getting an ...
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46 views

Understanding TVS diodes in this application

From this Reference Design you can see they use two TVS diodes at the gate of the first FET to clamp voltages greater than 500V. They do the same in this other Reference Design. So basically my ...
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43 views

High Voltage applied to TVS diode

I am using the below input circuit which has this SM6T36CAY 36V TVS diode. The input voltage range is 12-36V and the output is the same only dropping the diode forward voltage. Typical load ...
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32 views

Transient Voltage Suppression Diode with no current limiting component

BATT= 16V 27V Rated TVS Diode spec - TVS Diode Datasheet The circuit : My questions: I want to understand what happens when the BATT voltage goes above the TVS diode clamping voltage. For both ...
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165 views

What is the purpose of clamping the gate and source of a mosfet

Is clamping the gate and source of a MOSFET really important? I have seen this in some articles and some datasheets of MOSFETs where they have built in clamping. As far as i know they are used for ...
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30 views

Do active PZT audio buzzers (with built-in driver) create dangerous spikes on power supply?

I am planning to add a active piezo element audio buzzer with built-in driver (BESTAR BPT-14X or LOUDITY LD-BZEL-PB04-1408 ) to my recent quite complex MCU project. These buzzers come with built in ...
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44 views

Protect Jack plug circuit against transients and constant voltage

I have a question regarding input protection of a circuit. I have been looking all over the internet for awnsers, but can't seem to synthesize the right solution for my problem. To make my question ...
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22 views

4-position TVS/diode array connection

I'm using a SiLabs USB->UART converter. In the documentation, it recommends a specific TVS diode. The diode in question has four positions/pins, and appears to be a diode array. I have never used a ...
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49 views

Identify this SMD TVS

What is this exactly? It measures 0.14" (3.55mm) wide x 0.22" (5.56mm) tall x 0.09" (2.26mm) thick, likely a DO-214AA or SMB package. Circa 2016. Removed and photographed. Out-of-circuit it measured ...
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53 views

Where to connect TVS clamping Diodes

This question just came up during the review of a design. Should the TVS rather be placed before the feedthrough-cap or after? I would place the TVS before the cap (see A in schematic) because TVS ...
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30 views

Active transient voltage suppression clamp parts/design

I am revising a design that was originally specified with a SMBJ54CA [2] bi-directional TVS protection diode in front of an LM76202-Q1 [3]; this is in conformance with the design example in section 9....
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73 views

When ESD protection is necessary and where should TVS be placed?

I'm designing a PCB in which the main ICs are a STM32F0 microcontroller and an INA226. These IC have some IO pins exposed in a header and the device will be handled by people. Is it likely that an ...
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43 views

CAN Physical layer - Choke evaluation

I have my CAN configuration as shown in the below drawing(automotive application), the uC that I’m using has both the CAN controller and the physical layer transceiver built-in so I don’t need a ...
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1answer
46 views

Switching Inductive load with SSR on 240AC

I am working on building a kiln (approx 7.5kW) and am using a PID to control an SSR that drives a heating element I made from Kanthal wire. The problem I am having is that the heating element is a ...
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How does ESD protection work with TVS diodes?

I have two questions regarding TVS diodes. This paper describes very well what happens when you want to protect a circuit with a unidirectional and bidirectional TVS diode and a positive and negative ...
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64 views

Buck regulator maximum supply voltage VS. voltage spikes at input where we have a TVS diode

Currently I'm using a buck switching regulator AOZ1284PI of Alpha & Omega Semiconductor to generate a 5V supply from a 12V input of a lead-acid sealed battery, and I plan to use AOZ1284PI again on ...
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96 views

Is TVS diode fast enough to protect MCU from MOSFET malfunction?

I am using standart N-channel MOSFET (Fairchild FDS6676) switch like in this picture: Load is actually 10A resistive and 27V power source is fused with 15A non-recovery fuse. I am driving it directly ...
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75 views

Suppressing the turn off transient for a trailing edge 120V AC dimmer

I am designing an 120V 60 Hz AC trailing edge dimmer based on the reference design above. The gate is driven starting at 0/180 degrees of each cycle and turns off at a programmable phase later in the ...
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124 views

How to prevent voltage spikes when motor is turned off

I have a schematics as shown below. The power source is a benchtop power supply which supplies a constant 24V power. Motor is controlled with ESC. When running the motor and then turning it off I ...
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101 views

Issues with this USB ESD protection circuit?

I've used this ESD circuit on four boards for hobby projects. I have had no issues on two boards. On two others, the TVS diode for VBUS conducted when the board was plugged into a USB port, causing ...
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233 views

24V Isolated digital input protection TVS

I am working on creating 24V industrial Grade(Like Siemens PLC I/O) Digital Input circuit,The micro will use the 3.3V supply. circuit works with TWO input signal one of them is 24V industrial "24V_sig"...
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42 views

Can we use tvs and mov together for thruster?

I want to know if we can use both tvs and mov varistor together ? What will be good for thrusters ? And placement between esc and thruster or before esc? Update: system voltage is power supply ...
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202 views

Is this a reasonable setup for terminating and protecting an RS-485 transciever?

I'm working on a design where an RS-485 transceiver IC is connected to a Cat5e cable, hopefully at 96k baud at a distance of up to 150m. I'd like to offer some protection in the design, but I've never ...
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58 views

Question related to TVS Diode in series

I have a questions on my mind, and I hope that can be answered. The line to ground voltage is 54Volt, and I would like to know if it is possible to have two bi-direction TVS diode in series. I will ...
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64 views

Anyone hear of GMOV - Metal Oxide Varistor in series with Gas Discharge tube

I am currently working on protecting the Network switch. The network switch is powering a camera outdoor. I have read through multiple tvs components, and found advantages and disadvantages. Until ...
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111 views

Two Gas Discharge Tube in parallel; a fast acting gas acting tube and a gas discharge tube

I want to know what happens if we put two gas discharge tube (fast acting GDT and a GDT in parallel), and a tvs diode in parallel. Would there be an issue in putting GDT in parallel? Datasheet of ...
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133 views

GDT in parallel with TVS diode. Should the clamping voltage of the TVS diode be equal to the DC breakover of GDT?

I am putting a GDT in parallel with TVS diode, and I want to know if I need to have clamping voltage of TVS diode slightly higher than DC breakover voltage of the gas discharge tube OR have clamping ...
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35 views

TVS ESD diode power rating

Is there any rule on how to choose the power rating of a bi-directional TVS diode which will be used in automotive 12V system as an ESD protection? They range from 20-40W all the way to 1000W and ...
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128 views

Circuit Protection against 500V surge

With my firm we're trying to get the CE certificate for our device and one of the tests is the protection against power surges. For this, the test company is using a device that's connected to our ...
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89 views

Ways to decrease TVS diode capacitance

I am currently working on high speed ethernet data line, and I wanted to know if there is a way to decrease TVS capacitance. I thought of putting two TVS diodes in series to reduce capacitance. ...
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38 views

How do you determine what amount of capacitance is bad for data lines?

I am currently deciding on putting a TVS diode from line to ground on POE ethernet. The issue is that I don't know how the capacitance of TVS diode will play role on the data signal. Is 1000pf bad or ...
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49 views

Ethernet POE voltage measurement to determine Voltage clamping between line ot Ground

I am planning on using a tvs diode to clamp power peak to protect network switch; the Port is POE. The issue is that when I measure the voltage of ethernet line to ground, I get around 0.6V. When I ...
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39 views

Include TVS in low current battery powered circuit?

I'm designing a circuit powered by two alkaline cells in series with a voltage of 2-3.2V. After being fused this is going through the boost converter MCP1640B with constant 3V3 output. The maximum ...
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62 views

TVS Array Clamping With IO Less than Standoff Voltage

I have 2 IO lines one at +3.000V and the other at -3.000V. They do not turn on simultaneously. Both Voltage levels are off a precision <1%LDO Both lines are connected to a bidirectinoal TVS (...
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129 views

DO-160 indirect lightning requirement confusion

I am looking at many tvs diode online, and I wanted to know how to calculate to check if it complies with DO-160 indirect lightning surge protection. For DO-160, there are Waveform 3, 4, 5A&B, ...
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51 views

How does a bi-directional TVS diode work during breakdown?

To protect the low voltage DC circuit (5 V) from receiving high AC voltage (230 V), I want to use the TVS diode, which closes the low voltage circuit to ground and blows the fuse. I hope this is a ...
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80 views

Lightning Surge Protector that complies with DO-160. Indirect lightning waveform, Gas Discharge tube or MOV in parallel with tvs

Would it be wise to put Gas discharge tube in parallel with tvs diode? OR Would it be better to put MOV in parallel with tvs diode? Also when deciding on tvs diode, how does indirect lightning ...
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279 views

A TVS for lightning surge protection

A camera will be mounted outside and powered via POE to Aruba 2540 network switch. I don't want indirect lightning surge to travel into the network switch. I don't care if the camera gets destroyed. ...
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264 views

Any importance to TVS 'parallel' vs 'series' Topology?

I am working with an existing schematic which has bidirectional TVS surge protection, laid out like this: simulate this circuit – Schematic created using CircuitLab The TVS diodes are ...
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78 views

TVS diode identification

I'm trying to ID diodes on a board - the markings on the diodes are "BK 9EJ3D". I understand this is a TVS diode and it's being used to clamp RS485 differential pair to ground with a termination ...
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331 views

How to choose the correct TVS diode and how to size it?

So I was thinking about transient suppression and I found TVS diodes. I was wondering how to choose the correct TVS diode since they have 3 voltage parameters: Vc --> clamping voltage, voltage I ...
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106 views

Deep explanation on TVS diode voltage suppression?

I am looking for a deep explanation on why a TVS diode suppresses voltage. All of the research I have done on Google just says 'it suppresses voltage by shunting current', but this doesn't make sense ...
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57 views

ESD Input protection on low Vmax digital inputs (3.6v)

I have a microcontroller monitoring a few digital inputs. The max voltage on these inputs is VCC + 0.3v. VCC is 3.6v so these inputs can't be higher than 3.9v. These digital input are just switch ...

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