Hello,
We are using the uA78M33Q (Automotive Linear regulator) In our products and encountered a failure during a test. The test involved a 500V surge into the DC supply lines.
The design includes a Schottky diode (MBR0540) in series and a varistor (V18AUML1206 by Littlefuse).
The regulator was damaged after the test and did not supply 3.3V to the circuit.
Is there anything that can be done to improve this design, or do we have to accept that this regulator cannot handle such tests?
Thanks in advance,
Lior Bilia
Precyse Wireless Technologies.