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Best TVS Diode Voltage for a 24V Truck system?

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pigman

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Hey I am looking into TVS to protect a small circuit in an Automotive environment (truck) running 24V system. All the information I've been finding talk about 12V systems and their suggested TVS Diode voltage but I am struggling to find what the most suitable TVS Diode voltage should be for a 24V system? Does anyone know?
 
I would have said that you want a diode that is a few volts more than the maximum working voltage.

On a 24 V system, the voltage will be 28 to 29 V when the alternator is running. You should have a TVS that has a maximum working voltage at least 30 V.

The clamping voltage, which is the voltage that the TVS will limit a high-current pulse to, is much larger. What are you trying to protect?
 
Thanks guys, my issue is damage to the SMPS Fet in a 24V environment. I've since found the problem to be related to Transient Voltages. I have re-designed all the input stuff, up to and including the SMPS fet(was rated 40V as I didn't understand Transients when I built it), to be rated at the maximum clamping voltage and have chosen 2 x 36V 3000W TVS diodes to be safe. Thanks for your help guys.
Ohh the SMPS just switches down to 12V for other lower voltage bits and pieces, nothing fancy.
 
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