Questions tagged [tvs]

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

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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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39 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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25 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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56 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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36 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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38 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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3k views

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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40 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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72 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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62 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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66 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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57 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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98 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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40 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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103 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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49 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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46 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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79 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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88 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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32 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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103 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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63 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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36 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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42 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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38 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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59 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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79 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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43 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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63 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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160 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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3answers
153 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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65 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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148 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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88 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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42 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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74 views

TVS protection for CAN bus

It looks like every chip manufacturer has their own CAN bus TVS product nowadays, e.g. ON Semi NUP2105, Semtech 2492SQ, Bourns T24CAN, Nex PESD2CAN and many others. What is common for all of them is ...
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195 views

How to protect input against both ESD and reverse polarity?

I need to protect an external input on a device against both reverse polarity and ESD (IEC61000-4-2 +-8kV). The normal input is +5V dc at 100-200mA; the reversed input could be -5V and that should be ...
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36 views

pulled down io protection from overvoltage

I need to protect my IC's io form overvoltage(default is 5v). The pin has the capability to source 10 mA and sink 25mA I tought of using a tvs diode(between pin and gnd) and a resistor(330r from pin ...
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62 views

Input Protection Diodes Functioning with Circuit Breaker?

I was wondering if I was correct in assuming these diodes were being used for ESD protection on the input of a power circuit. I'm a little bit confused what the point of the diodes are when there's a ...
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50 views

Snubber capacitor Voltage rating

I am designing a switching circuit for celing fan (max 80W/230VAC). This is basically relay based switching. I planned to add snubber circuit to reduce the back emf. I got a resistor value of 100&...
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73 views

Limiting voltage transients with a TVS diode

My goal is to suppress transient voltage spikes from damaging the 5V, 600mA Step-Down Voltage Regulator D36V6F5. I believe the transients are a result of high inductance in the wires between the power ...
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25 views

Will the TVS diode work if a high alternating voltage accidentally gets into the circuit?

I have a controller with power lines 220V / 12V / 5V. The 220 V line is well insulated from low voltage circuits. On the 12 V line, a TVS P6SMB16CA diode is connected. What happens if 220 V ...
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297 views

Unidirectional vs Bidirectional TVS diode for ESD protection UART bus

On my board comes a UART line with a voltage of 3.3V. To safely communicate with the controller on 5V, I use a level offset based on BSS138 transistors. My goal is reliable ESD protection of the UART ...
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1answer
79 views

The Thermal relief consideration for TVS diode (for ESD protection)

I am designing a print which has some mircofit connectors, I have placed TVS very close to the connectors on the print and the ground pad connected with a GND polygon directly, this polyon connects ...
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445 views

Placement and values for ferrite bead/capacitor ESD protection / transient suppression filter

I've been researching but found it difficult to find a clear answer on this. I need to add ESD protection to my circuit, in this Texas Instruments video it talks about combining a TVS diode with a FBC ...
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80 views

Why less protection on a GPIO RS485 board compared to an UART RS485 board?

When I search for RS485 board (to be used for my Arduino to control DMX512), I find mostly two types: GPIO / TTL based (which I want to use), like TTL RS485, which mainly has a MAX485 and some ...
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103 views

TVS diodes in series

In the picture below, there are three TVS diodes in series (D13, D14, D15). They are placed from drain to -13V reference, which is the reference for the rectifier. The diodes are 1.5KE300A, they have ...
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71 views

Simple braking chopper using Zener/TVS diode

So I'm designing a motor controller, relatively low power (100-150W, 12-48V supply), and I'm thinking about adding a braking chopper. Not strictly needed in this design, but it would be a nice value-...
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62 views

How to protect against line transients?

I am designing a circuit that can detect if a cable is connected to mains voltage (e.g. via an external relay or switch). The device will be installed in electric cabinets. The circuit is tested and ...
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209 views

Bulk current injection - Resonant frequency of ESD protection diode CAN bus

Link to the application note that I'm referring to below. I was going through an application note by On Semi, System Level Surge Suppression Solutions for the CAN Bus -AND8253/D, where it says that ...