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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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117 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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24 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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24 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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371 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
60 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
45 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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1answer
20 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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43 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
40 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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34 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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80 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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104 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
449 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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55 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
122 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
57 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
117 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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55 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
96 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
118 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
61 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
187 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
819 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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67 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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112 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
98 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
329 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
435 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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31 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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138 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
159 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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262 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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102 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
84 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
125 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
447 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
69 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
655 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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278 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
123 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
263 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
318 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
365 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 ...
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1answer
106 views

how to select the right TVS / fuse combination?

I am working on a design featuring the MP1495S switching regulator. The regulator will take 12V and output 5V. The maximum current I want to allow at the output of the regulator is 3A. 1) I am ...
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1answer
150 views

How to combine and protect two 12V automotive signals into one?

In the below circuit, the DC component (6V) of a bridged car head unit speaker wire turns on a LM53601 buck converter. The LM53601 accepts voltages up to 42V. The +12V input into Q2 is protected to ...
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1answer
423 views

Diode TVS selection for 36V circuit

I am wondering what is the criteria for selecting diodes TVS, for example my circuit runs at 36V and I want protect my circuit from spikes But I am little confused about the Breakdown Voltage (VBR) ...
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1answer
888 views

Flyback Transformer — RC Snubber vs. TVS Diode?

I've got a flyback transformer circuit, that was designed by a firm and they tended to over-engineer things (this is in a commercial project). I re-laid out their circuit and on the primary end of ...
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402 views

Using TVS at the circuit input with or without a resistor

I'm new in the subject and cannot figure out how to use TVS for a particular reason. Here is what I commonly see TVS at the input of a circuit: Here another circuit has TVS again at the input, but ...
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1answer
319 views

Protect battery from overvoltage - DC brushless motor overspeeding condition

I'm trying to figure how to protect batteries from overvoltage on my electric skate. Specific condition is : motor would run above max RPM based on system voltage. Motor is 85Kv, battery voltage is ...