Voltage Suppression from 35V - 20V

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A hobbyist is experiencing a voltage spike of 38V in their circuit and seeks to reduce it to a maximum of 20V to protect external components. They require a protective device that remains inactive when the voltage is under 20V, as using resistors is not viable due to current constraints. Suggestions include using a Transient Voltage Suppressor (TVS) or a Zener diode to manage the voltage spikes effectively. Resources like Mouser and Digi-Key can provide data sheets for suitable TVS options. The discussion emphasizes the importance of finding a robust solution to maintain circuit integrity.
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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