Questions tagged [tvs]
Transient Voltage Suppressors (TVS) are a type of semiconductor designed to protect against overvoltage situations.
413 questions
3 votes
2 answers
190 views
TVSs versus Snubbers to protect power MOSFETS
Designing a switching power supply. Modelling with trace self-inductance on switching FETs shows troubling voltage spikes. I know there are a number of ways of minimizing the spikes but I would ...
- 162
0 votes
1 answer
60 views
How to combine ESD protection with steady state over voltage protection for ADC input?
As a hobbyist I am planning to build a PCB that reads temperature and pressure sensors with ADC. The signal voltage ranges from 0 to 5V. There might be a situation when someone by mistake connects 12V ...
- 221
2 votes
2 answers
429 views
TVS, only bidirectional or can also use unidirectional?
For the following circuit I need a TVS. Ideally it should be a bidirectional TVS like SMBJ400CA. But since I only have access to its unidirectional version (SMBJ400A), considering the half wave nature ...
- 513
-1 votes
2 answers
214 views
Why resistor instead of a fuse?
This is input of a non-isolated buck offline switching power supply (MP175GS with absolute maximum input voltage of 700v). Input is 100-265Vac. TVS is SMBJ440CA (713v clamping 600W BiDir). Resistor's ...
- 513
4 votes
1 answer
433 views
Understanding USB-C ESD proection through TVS diodes
This is my first time working with USB & I have a USB_C_Receptacle_PowerOnly_6P receptacle schematic. It has a VBUS pin, CC1 pin, CC2 pin, Shield and GND pin. My current layout is shown below, ...
- 270
1 vote
3 answers
219 views
Is a TVS diode enough to protect BMS MOSFETs from motor inductive kickback?
I’m working on an EV 2-wheeler project (48 V system). On the BMS side I don’t yet have protection designed for motor inductive kickback, but I want to test the setup without damaging my BMS MOSFETs. ...
- 67
0 votes
1 answer
79 views
What is this component with FM 3K9AA marking on it?
A SMD diode like component with "FM 3K9AA" marking is on a board that I'm trying to decode. Please help me identify it. Looks like an L-filter for a TVS but I'm not sure. If so how can I ...
- 513
1 vote
0 answers
94 views
Best practice for connecting a RF TVS Diode to a SMA connector?
I am designing a 4 layer PCB that will utilize a 900 MHz RF radio that requires a 50 ohm impedance trace going to an SMA connector. This PCB will be inside an aluminum NEMA enclosure, outdoors, and ...
- 173
0 votes
0 answers
33 views
Which TVS for LTE module antenna?
I'm building a board with a A7682E GSM LTE Cat1 radio module. About antenna, the hardware integration manual states this: I unable to find the recommended TVS diodes nor their datasheets to find ...
- 639
1 vote
1 answer
48 views
Generate PSPICE OLB from Lib (SMBJ3V3)
I am trying to create a PSPICE library using Vishay's .Lib. I have managed to do this, but unfortunately the library is still faulty. I took a look at the Lib file and discovered SPICE parameters that ...
- 61
0 votes
1 answer
99 views
Relays and ESD: Protection Needed?
Have a relay with a built-in flyback diode. Preparing to do some ESD testing and am uncertain if the input to the relay needs any ESD protection. I understand that IC inputs and other more sensitive ...
0 votes
2 answers
191 views
ESD Protection for UART and I2C
I am designing a PCB board that features the ESP32 as the microcontroller. The UART pins will connect to an external HMI LCD, specifically the TJC (a Chinese version of Nextion), through a screw ...
- 355
0 votes
1 answer
103 views
500V Surge Protection 24V
The circuit shown above is my current protective circuit. The device must withstand 500V surge pulses in accordance with the 61000-4-5 standard. The device is operated with 24V. I now have the ...
- 73
1 vote
1 answer
64 views
Surge protection of 10 - 15 V AC garden power supply input
I am building a power supply that will be used outside - permanently installed in the garden. It will be supplied by 15V AC that is made using a 110V / 15V transformer. The output of my device will be ...
- 305
1 vote
1 answer
90 views
MOSFET polarization issue with TVS diode
All voltages expressed below are related to GND. The goal of this system is to cut current from flowing from VSuperCap to INTERNAL, based on EMERGENCY_CUT input. EMERGENCY_CUT input can be floating or ...
- 639