1
\$\begingroup\$

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

\$\endgroup\$
  • \$\begingroup\$ 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. \$\endgroup\$ – elchambro Jun 12 at 3:50
  • 1
    \$\begingroup\$ compel.ru/wordpress/wp-content/uploads/2017/05/… - part 2 and useful info about part 3 \$\endgroup\$ – Andy aka Jun 12 at 9:26
  • 1
    \$\begingroup\$ @Andyaka you're a legend ! \$\endgroup\$ – Lolcatsnin Jun 14 at 23:11
  • \$\begingroup\$ @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. \$\endgroup\$ – Lolcatsnin Jun 14 at 23:12

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.