Voltage Suppression from 35V - 20V

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Discussion Overview

The discussion centers around minimizing voltage spikes in a circuit, specifically reducing a spike from 38V to a maximum of 20V to protect external circuitry. Participants explore potential protective devices and methods, including zener diodes and transient voltage suppressors (TVS).

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • A participant describes a circuit experiencing a voltage spike of 38V and seeks to limit it to 20V without affecting normal operation below that threshold.
  • Some participants inquire about the source of the voltage spike to better understand the problem.
  • One suggestion is to use a 20V voltage regulator as a potential solution.
  • Another participant recommends a transient voltage suppressor (TVS) as a suitable protective device, providing guidance on how to find a data sheet for selection.
  • A specific zener type device, P6KE24V, is mentioned as capable of handling high voltages, although it is rated for 24V.
  • A participant expresses intent to search for a TVS from Mouser and share findings.

Areas of Agreement / Disagreement

Participants present multiple potential solutions, including TVS and voltage regulators, but no consensus is reached on the best approach. The discussion remains open with various suggestions and inquiries.

Contextual Notes

Participants have not provided a schematic of the circuit, and the source of the voltage spike remains unclear, which may affect the proposed solutions.

Daniel Floyd
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Ok i am a hobbyist and i currently building a circuit in which when i place this on an oscilloscope i am gaining a voltage spike of 38V i need to minimise this spike down to a maximum of 20V in order to protect my external circuitry. When my circuit is working under 20V i need this protective device to have no action thus the circuit as it would. The current in this circuit is a big problem so using resistors in series resulting in less current is not an option.

I have heard that there are protective resistors that can be used or zenner diode circuits. can anybody help me with this?


Regards Daniel Floyd.
 
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Daniel Floyd said:
Ok i am a hobbyist and i currently building a circuit in which when i place this on an oscilloscope i am gaining a voltage spike of 38V i need to minimise this spike down to a maximum of 20V in order to protect my external circuitry. When my circuit is working under 20V i need this protective device to have no action thus the circuit as it would. The current in this circuit is a big problem so using resistors in series resulting in less current is not an option.

I have heard that there are protective resistors that can be used or zenner diode circuits. can anybody help me with this?


Regards Daniel Floyd.

Can you post a schematic of your circuit?
 
What is the source of your voltage spike?
 
Could you use a 20v voltage regulator?
 
What you probably need is a TVS (Transient Voltage Suppressor).
One way to get a data sheet on a TVS is to go to either Mouser or Digi-Key and search for TVS. When you are shown data for TVS, select a like one and then ask for a data sheet.
It may take some searching, but you should be able to locate a TVS that will keep the transient voltage below 20 volt.

Good Luck
Carl
 
Look up P6KE24V. It is a zener type device that can REALLY take a beating. Of course it is available in other voltages, the number I gave is a 24 volt device.
 
Thank you i will begin my search around a TVS from Mouser I will then post my findings.
 

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