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Im looking towards using an system basis IC for one of my designs (UJA1164A) and i noticed that under the features & benefits it notes that

"Battery and CAN bus pins protected against automotive transients according to ISO 7637-3"

i unfortunately don't have access to the sheet so i'm unaware to how far this standard goes, and wanted a second opinion. In either a 12v or 24v automotive application how well would it fare (or at all) with a load dump, especially if we're talking about a 24v system that expects around 170v for few hundred ms without a beefy TVS to clamp it ?

diagram

worst case i was looking to the TIDA-00992 for additional protection or putting in some big boy tvs suggested on here Link

or one of these tvs tvs link

jsotola
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lolbardsnin
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  • From memory, ISO7637-3 is for Signal Lines only, and contains only short sharp low(ish) energy transients. ISO7637-2 is for supply lines, and has Load Dump. For 24V system you'll most likely need a Transzorb, as you say. Do lots of testing, including in-vehicle. Truck power supply is really nasty. – elchambro Jun 12 '20 at 03:50
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    http://www.compel.ru/wordpress/wp-content/uploads/2017/05/ISO-7637-22011E.pdf - part 2 and [useful info about part 3](https://biblio.ugent.be/publication/8548379/file/8548382) – Andy aka Jun 12 '20 at 09:26
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    @Andyaka you're a legend ! – lolbardsnin Jun 14 '20 at 23:11
  • @elchambro haha, sorry for the terminology it's a TVS series name. Yeah definitely will do alot of testing, i've read that its an absolute arse to work with. – lolbardsnin Jun 14 '20 at 23:12

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