Questions tagged [tvs]
Transient Voltage Suppressors (TVS) are a type of semiconductor designed to protect against overvoltage situations.
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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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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, ...
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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 ...
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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 ...
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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,...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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
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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.
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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 ...
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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 ...
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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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Specifying a TVS to protect against inductive spikes
I'm choosing a transient voltage suppressor to absorb the freewheeling current from a 1mH inductor in the rare situation the output of a SMPS is disconnected during load.
simulate this circuit –...
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A question about transient voltage supression
I am a programmer that often ends up testing electronics while testing my code. I've seen the following happen a few times, and when I asked my EE about it the other day he just kinda shrugged and ...
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TVS diode vs capacitor
I've gone through this link which is a similar question.
In some places, capacitors are also used for ESD purposes.
In some places, along with capacitors, TVS diodes (or ESD diodes, not sure which ...
user220456
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Protection against transient voltage spikes regarding ISO7637-1/2: TVS diode with Schottky diode suitable?
I have a question regarding transient voltage spikes based on ISO 7637-1/2.
For positive voltage impulses, you would want to use unipolar TVS diodes in reverse mode to clamp the voltage to the TVS ...
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Will this TVS protect my LED from inductor voltage surge?
Say I have an illuminated switch (say, this, or something equivalent) hooked up like so:
simulate this circuit – Schematic created using CircuitLab
(Presumed internal resistor of the switch's ...
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Isolation distance between tracks with focus on ESD
I am working on a product which has to meet:
8kV IEC 61000-4-2 contact discharge
4kV IEC 61000-4-4 transients
1.2kV/500Ohm IEC 61000-4-5 Surges
The schematic:
simulate this circuit – ...
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Input impedance of an electronic load
I would like to simulate a TVS with an electronic load working in constant voltage. I could add some resistor in serie with the electronic load to simulate the dynamic resistor of the TVS. ...
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Difference between Surge, ESD and EFT
I was going through this ESD Presentation where I noticed the below image:
I'm trying to understand the different types of overvoltage and they have given the classification above.
In this, what I ...
user220456
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Bidirectional TVS diode for protecting dual-rail power
I read that the Raspberry Pi 4 uses a uni-directional TVS as over-voltage protection on USB power.
I also read some AC PSUs use a bi-directional TVS as over-voltage protection.
My circuit is powered ...
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ESD Clamping diode specification
I'm using this Ethernet PHY
I've connected the ESD diodes on the Ethernet differential signal lines.
When I use this part the device is failing ESD.
When I use this part the device works fine.
Can ...
user220456
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TVS selection for 3,3V GPIO
It's usual in my electronics design to have external connectors where GPIO signals are routed. This GPIO lines are usually 3,3V and goes directly to the MCU in some cases. In this scenario, I put a ...
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Power-Input protection
i need a little help with designing a power input "stage" for a product with the following requirements:
Input-Voltage 5V +-10%
Output-Voltage with two independent 1V8 rails (150mA max with ...
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(Another) how do I choose an appropriate TVS for a relay?
I've seen questions about selecting TVS diodes before (for example, How to choose the correct TVS diode and how to size it?; there are others, but they aren't about TVSs for protecting relay coils). ...
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ESD protection for MCU pins
I am working on a MCU project. The MCU pins have a limit of 3.6 V and the Voh is 2.86V.
I am trying to find a TVS diode that could save the pins !!.
I am getting TVS diodes with 3.3 Vrm .
I believe ...
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Need help to improve schematic of AC-DC converter (230 VAC to 12 & 5 VDC)
I am a newbie starting a project on an Arduino. One part of this project is to design a complete AC-DC converter to feed:
Input: 230 VAC
Outputs:
the Arduino with 5 V,
one set of Arduino 5 modules ...
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Difference between D, D+Z and TVS for inductor surge suppression
Let's say I have a switched inductive load (e.g. a lift/hold electromagnet, electromagnetic actuator, or relay coil). IIUC, when the switch/EMR/SSR opens, the collapsing magnetic field can cause the ...
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Help understanding clamping voltage of ESD protection chip
I'm trying to understand the properties of an ESD protection chip USBLC6-2 (datasheet), which is designed for USB 2.0 circuits.
Section 2.1 shows an example calculation for the clamping voltage, CL, ...
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How to choose the right TVS diode for ESD protection?
I'm designing a board where some external digital signals must enter a STM32 MCU GPIO input (VCC = 3.3V).
I would like to add simple ESD protection, a TVS diode, but I have a doubt about how to choose ...
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ESD protection of analog inputs
I have a design where I measure 0-24 VDC on an STM32 ADC using a divider to translate the input voltage down to 0-3 VDC through a 10.5 kΩ and 1.5 kΩ divider. What would the be the best way to ...
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How to develop an ESD circuit protection
I am trying to solve what seems to be a common issue of the MAX232 chip getting burned by electrostatic interference. To solve this issue alternative chips are available on the market such as the ...
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Technical explanation desired: are TVS safe for continuous dissipation? Why/why not?
In answers such as this one, https://electronics.stackexchange.com/a/647135/311631 I've seen suggestions that TVS diodes are not "reliable" under repetitive or continuous operation, such as ...
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Bidirectional TVS in 12 V DC
I understand that bidirectional TVS diodes have no polarity and can be used to limit positive and negative swings in an AC application.
Is there a down side to using bidirectional TVS diodes in 12 V ...
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Overvoltage protection for RS485 from DC-DC voltage
I am making a circuit to protect RS485 against 24V and 32V DC over-voltage. Note that my power supply is 12V. I've done my research and found solutions, but I can't fake it.
More specification ,my ...
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RS485-Protection(signal (A-B) from input voltage (12v and 24v )using TVS diode
To protect RS485 signals differential (A/B) from power input (12 and 24 V), we can use TVS diodes.
TVS diode parameters:
There are many types of TVS diode in the market, designed for a specific ...
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ESD diode current specification
I'm using this ESD diode for an Ethernet application.
The clamping voltages and the working voltage values are satisfied.
But I am not sure about the current values.
The minimum peak current is given ...
user220456
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How to detect the maximum current for this waveform?
I need to select a TVS diode for ethernet applications and came across this application note. I want to find the right clamping peak current and the clamping voltage of the TVS diode.
Here, on page 4, ...
user220456
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Looking for replacement diode V6 88
I'm guessing this is either a Zener or TVS diode. All I can see is 'V6 88' i can't find any info anywhere about it. My ECU in my bus has cooked 2 of these, side by side, so I guess they need replacing ...
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Identify diode marked CD
Diode that needs identification. It is from a power board for a xenon lamp. I could not identify it at all. I referred to the STM site as well but could not find anything. Could you please help?
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Maximum current on dual-channel TVS diode
I have a dual-channel TVS diode from LittelFuse SM24-02HTG.
In its datasheet, a maximum value of 7A is indicated as Peak Pulse Current.
Does this current refer to the single TVS diode in the component ...
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How to use TVS diode for Overvoltage Protection while powering Arduino on Vin Pin?
I am trying to make a protection circuit for Arduino nano to protecting overvoltage. Normally if I powering "Clone" arduino NANO with 12 Volt, Arduino nano is starting to smoke. So I've ...
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Circuit protection from voltage spike
In order to suppress the voltage spike getting from an AC single phase motor (it is an exhaust type fan connected to 10 A relay) can somebody please guide me to select a proper protection device.
To ...
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What should be the clamping voltage specification for selecting a ESD/TVS diode
I'd like to understand how to select a clamping protection device, say TVS/ESD diodes, for Ethernet/USB lines ?
Like, what should be the current rating and the clamping voltage rating for the ESD ...
user220456
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Why is the MOSFET in my circuit getting very hot?
I want to drive the inductive coil (26 ohm) at 48V DC. I have a 4N65 N_MOSFET. I'm giving 9V Vgs @ 150Hz switching square signal. For spike protection I used TVS diode having part number 3.0SMCJ170A.
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