Author Topic: Replace PESD1CAN with two TVS?  (Read 452 times)

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Offline okwTopic starter

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Replace PESD1CAN with two TVS?
« on: June 21, 2023, 08:20:14 pm »
I'm looking to replace an ESD for CANBUS with a more generic product. PESD1CAN is two bidirectional TVS and comes in SOT23, and if possible I would like to replace it with two generic SOD523 or similar (more flexible in tight layout).
I'm not sure how to read the PESD1CAN datasheet, and choose a "identical" or better spec'ed TVS.
Like "RATED STAND-OFF VOLTAGE", should I choose exactly 24V or is higher also fine? And with the "MINIMUM BREAKDOWN VOLTAGE", can I go lower? And "MAXIMUM CLAMPING VOLTAGE", should I choose the same or higher? Etc.
How to choose? :)
 

Offline Niklas

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Re: Replace PESD1CAN with two TVS?
« Reply #1 on: June 21, 2023, 08:45:04 pm »
Low capacitance. 100pF or less for the combination of CAN transceiver, filter and TVS.
Bidirectional diode. Important if 0V connection is lost, could otherwise hang the bus.
Standoff voltage should be above maximum operating voltage so a harness short or miswiring does not damage the TVS. 24V is OK for passenger cars. Trucks and buses with 24 V battery will need closer to 36V to on the safe side.
Clamping voltage should cover the absolute maximum rating of the CAN transceiver and filtering components.
Also check the specifications for what ESD voltages and method (machine or human body) it is supposed to handle. Smaller package might not be able to handle the same pulse energy.
 


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