I've got a board that I'd like to protect some 3V3 peripherals from accidently getting fried by 5V from some bonehead (might be me) misconfiguring jumpers. What's a good value for the current limiting resistor to put behind the zener to ground? 50 Ohms? I'm thinking 3V3 rail -> zener -> resistor -> …

Zener diode protection question

system November 24, 2012, 6:12pm 5

also pay attention to zener diode temperature characteristics ]

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