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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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24 views

Resuability of TVS Diodes which are injected by some surge

I'm using some TVS diodes for USB protection. Even if their shields are connected to directly for source GND, I soldered some diodes for electrostatic issues. I searched this site and Korean wikis, ...
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1answer
31 views

DC floating ground and TVS Diodes for ESD

I want to provide ESD protection for a low voltage battery powered device and I do not understand what sort of net I should attach to the cathode side of the TVS diodes: I do not have a strong ...
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1answer
38 views

Circuit protection component arrangement

I was reading this thread and decided that in general it's better to place the reverse polarity protection diode D2 after the TVS rather than before it, and to instead use a bidirectional TVS for D1 (...
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2answers
213 views

Automotive load dump protection with TVS diodes

In this marketing material by Littlefuse they explain how to use e.g. their TPSMA6L TVS diode for automotive load dump protection: TVS Diodes can provide secondary transient voltage protection ...
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21 views

High voltage current source for TVS testing

I need to build a simple device for TVS diodes testing. For that test, I need to generate an 80V pulse (10 us width I think) with 1 mA current limit. The things that come up to my mind are current ...
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1answer
45 views

TVS diodes for Ethernet/PoE?

I am getting confused in selecting TVS diode for Ethernet Interface. Should I connect one bidirectional TVS diode across a ...
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1answer
199 views

TVS bidirectional diode not working

10x bidirectional diodes 1.5KE400CA in series, balanced, then the chain in parallel for DC line protection. Breakdown voltage 400V per diode. Still got 10kV+ voltage spikes (picture below, x100000 ...
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1answer
30 views

TVS diode with 10 - 15 V forward voltage

I came across this TVS diode: https://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smf3_3_datasheet.pdf.pdf It has a forward voltage drop of 10 to 15 V. Why? How? ...
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30 views

How to add the TVS protection?

I'm still busy with my DMX splitter (soldered everything), however, I made a mistake with my TVS protection diode. I put it in series with 220 V AC, and nothing happens (no current flows). I expect I ...
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382 views

Pulsed DC, kA range inductive transient protection method

I would like to design a transient protection solution for HVDC_pulse_unit. HVDC voltage = 3500V , current > 40kA. Events: D1 flyback diode survives(50kA surge forward current). MOVs section did ...
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1answer
90 views

Connection of ESD return path the System GND

In my current design I have one RJ45, one RS232 and two RS485 ports. I have TVS diodes CDSOT23-SM712 for serial channels and ESD7104MUTAG for Ethernet port. Now I have connected the ESD GND of the TVS ...
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2answers
60 views

Confusions with placing and sizing the flyback diode, TVS and Zener

I have couple of questions regarding the location of flyback diode and sizing and locating the Zener and TVS diodes. For example below at the far end there is a magnetic relay which is controlled by a ...
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25 views

ESD/overvoltage protection with DM1231-02SO TVS array

I'm protecting a USB2.0 IC against ESD and overvoltage at the USB connector using a Diodes Incorporated DM1231-02SO TVS (dual) array. The datasheet labels the pins IN and OUT, but it's not 100% clear ...
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2answers
64 views

ESD diode selection based on VCC of the IC

I have a question about TVS diode selection. This kind of question is already discussed in previous questions. ESD Diode - GPIO Microcontroller Selecting a TVS for ESD protection For protecting vcc ...
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2answers
65 views

TVS diode Clamping voltage

How to choose TVS diode? What's clamping voltage? If in case TVS diodes clamping voltage 57V if anything more than 57V what will happen to diode and circuit? Would it break? Or pass the voltage?
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62 views

Operating a 24VAC solenoid with a Triac. Protecting with TVS DIODE, RC Snubber or both?

As part of a project I am controlling 24VAC solenoid sprinkler valves like this https://rayshobby.net/wordpress/understanding-24vac-sprinkler-valves/ using a triac (BT1308W) http://www.mouser.com/ds/2/...
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84 views

Why do bidirectional (TVS) diodes sometimes have a 'direction' mark?

TVS diode with marker Some components that are needed to be be in a certain direction (like most diodes, and some capacitors) there is a white line over the component to show the direction. But why ...
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137 views

RS485 transceiver design

I'm working on a TTL to RS485 transceiver which is part of a bigger project (arduino based) and I came up with the following design: I have a few questions: 1) I have seen very different values for ...
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2answers
559 views

How can I compare a TVS diode with a varistor?

For a 120Vac line protection element, comparing this TVS diode: With this varistor: The immediate differences I see are: The varistor is marginally cheaper The varistor specifies a maximum working ...
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1answer
89 views

Reverse Polarity and TVS Diodes Not Working?

This is a follow up to this issue: Damaged TPL7407LA Transistor Array (*Updated With Scope Testing Images*) We are experiencing both reverse polarity and transient voltage spikes in our automotive ...
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2answers
125 views

Is this optocoupler front-end safe?

This is a follow-up to Is this line detector safe? I'm re-designing the front-end based on some great feedback from the community. I've decided to move to the following topology: The phase of the ...
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1answer
69 views

Varistor + Inductor + TVS transient protection

I am struggling to understand how this circuit should work: I understand that inductor in this case is going to reduce the rate of changing current flowing through it, but I do not understand what is ...
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2answers
149 views

Questions about prototyping a DMX Splitter

Original schematics I want to make the following DMX Splitter: Credits by J. Mack, see Full article: DMX Splitter Changes Changes made by me (with help of Maple, Transistor and many others, thanks ...
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1answer
61 views

Old crt tv help [closed]

my old portable crt television has this port on the back that looks like a headphone jack, but it's labeled ext ant. Can I connect a rf modulator to that port at all? Thanks...
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3answers
105 views

Using Raspberry Pi to turn TV on and off directly (not using infrared) [closed]

I am creating a device that requires a TV to be powered on and off when commanded by the code in my Raspberry Pi 3 B+. The Raspberry Pi also needs some sensing ability to know if the TV is on or off, ...
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4answers
178 views

Enhancing TVS diode circuit

I was reading into Electromagnetic Compatibility Engineering by Henry W. Ott about ESD protections and I was interested by the following part. First, a series resistor (or ferrite) added in front ...
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0answers
70 views

High power / high current clamping circuit

I am looking for ideas on how to clamp high energy surges in the input of a high current / high power system. The input to the system is 24V. During steady state, the system sources 85A of current ...
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1answer
303 views

Driving a 24VAC solenoid with arduino using a octocopuler and a triac

Following a previous question I have redesigned my schematic: I'm trying to energize a solenoid used to open and close a 24VAC sprinkler valve I have the following questions : 1) The GPIO leg can ...
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3answers
916 views

ESD protection on analog signals

I have a board which has its microcontroller pins directly breaking out to a breakout header. I am fairly certain the board won't be in ESD safe environment when being tested. I decided to get ...
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0answers
71 views

TVS protection burnt too easily

It's about an year that I'm using TVS diodes to suppress spikes from the AC motors (240V - max 240W) that drives my roller shutters and protect the solid state relay that actuate the motor. What is ...
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1answer
162 views

Controlling a 24VAC solenoid with arduino

I'm trying to come up with a design for controlling a 24VAC water valve with an arduino. My current design : I want to use a BT1308W TRIAC controlled by an arduino pin to activate the vale, I'm also ...
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1answer
137 views

tvs diode for push button switch section

Do push button switch signal requires TVS diode in its path ? I have seen TVS diode for push button switch signal in many circuits along with pull resistor , capacitor (RC for debouncing) as in below ...
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5answers
405 views

How necessary is ESD protection, really?

I'm not asking about manufacturing. I'm asking about designing electronics to survive normal use in the field. I want to figure out just how necessary it is to include TVS diodes in my design. As I ...
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4answers
498 views

Placing TVS or MOV or Transzorbs for a very basic protection

This is a question for a general scenario I encounter. So I will not be specifying much details besides the voltage level, cable length/type and the power supply type. Imagine a sensor placed ...
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34 views

TVS Diode Response

I am trying to understand what would the response of the TVS diode be when I will apply +5V and -5V across the device. From what I understand is that when I will apply +5V and Ground across Pin1 and ...
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186 views

Selecting Appropriate TVS Diode for protection against Load Dump

I am working on Bike Flashing lights. I have used 7805 as the regulator to supply +5V to the controller, also have 1N4007 in series at the input with capacitors. I don't want to add any expensive ...
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1answer
111 views

how to test LEDs

I am a retired electronics engineer trying to fix my black screen Toshiba LCD/LED 40" TV. I have watched various videos showing how to test individual LEDs by scratching the track on either side. I ...
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2answers
171 views

What specifications matter when comparing TVS ICs?

I have been wanting to update a design I have to include a USB to UART Bridge and while looking at the datasheet for the CP2102N saw what is in the image below. I have never worked with a TVS before ...
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325 views

AC/DC power supply: help to choose fuse, varistor and/or TVS diode

I'm going to use this 12VDC AC/DC power supply . It is the first time that I am going to use one and I have some questions about over voltage protection and peak current protection. These are the ...
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131 views

IEC 61000-4-5 1000V Surge protection for high-side MOSFET output

I have following schematic, which must withstand 1000V Surge, applied on output OUT according to IEC61000-4-5. As it is signal output the series resistance of IEC Generator is 42 Ohm and I want to ...
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1answer
113 views

help identifying TVS diode

My Precor M9.23 treadmill stopped working, and after reading the troubleshooting manual and looking at the motor control board, the led indicated that the board is bad. Upon removal of the board, I ...
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1answer
138 views

TVS diode protection on a capacitor bank?

I'm currently designing a variable frequency drive for powering an AC induction motor. I've three 400V/680µF electrolytic caps for smoothing the 325V (nominal) DC bus. Then the DC bus is chopped by ...
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2answers
516 views

Relay protection when proper TVS at load cannot be implemented

I'm currently developing a product which has a simple SPDT relay that can be controlled by an operator. To the end-user, only the common, normally open and normally closed contacts are available. The ...
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1answer
77 views

Some questions about the RECOM RAC02-05SC AC/DC power supply converter

I'm designing a PCB and I want to use this AC/DC power supply converter. I have found this commercial PCB where they use it and I have these questions: I have seen that the PCB has some slots (see ...
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2answers
729 views

Connecting TVS before or behind Ethernet transformer?

I looked at several designs and recomendations. Why do TVS diodes sometimes connect before and behind transformer? What are the pros and cons of connecting before or behind?
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331 views

ESD protection for DC supply line

simulate this circuit – Schematic created using CircuitLab I'm working on a system that will go into ESD testing, The system is powered by an external regulated DC voltage. I'm now using an LC ...
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1answer
140 views

TVS protection negative going ESD event

I want to protect an 12V input from ESD events. The allowed input voltage range is 0V to 12V. I could use a unidirectional TVS diode for that purpose but my colleges suggest to use a bidirectional ...
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1answer
291 views

TVS Diodes for Audio?

Usually audio inputs use protection diodes that shunt into the power supply rails of the device they're protecting. But is this really necessary? Why are TVS diodes not used here? Yes, some are high ...
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1answer
385 views

Why are different currents through the TVS diode or 8-20 us and 10-1000 us

In datasheet you can see that the currents are different. For any TVS diodes, Ipp(8-20)> Ipp(10-1000). For an example, see datasheet SM15TY I do not understand why the current depends on the ...
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2answers
449 views

ESD Protection for Ground?

I'm wondering why I don't see ESD protection for ground (can you even protect ground from ESD?) - If there is a large electrostatic discharge straight onto the ground plane wouldn't that voltage spike ...