Out-of-tolerance zero ohm resistors

dagmargoodboat · 2015-05-29T15:13:23+00:00

An assembly house apparently substituted some 1210 zero-ohm resistors with another mfr's part. They're passing >10A, so part characteristics matter. The substitute parts measure 12.5 milliohms, dissipating an extra 1.3W in an enclosed unit that doesn't appreciate that. The Vishay parts spec'd list 4 milliohms max, but actually measure 2.5 milliohms. Much better. Just for fun I measured the drop across the solder fillets too--only 1mV out of 126mV total. Insignificant. I figure they're both out of tolerance though, one by infinity percent, and the other by 5*infinity percent. Someone put those in for

May 29, 2015 140 Replies

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John Larkin 11 years ago

There is on mine! Both sides!

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I bought two pieces, 1 square foot each, $100 each. I think the board house just made up those prices. We are a good customer, and purchasing said "The President wants these...."

What she actually said was probably "This in stupid crazy, but the President wants these."

John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com

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Out-of-tolerance zero ohm resistors

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