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[FAQ] Why is there leakage current on pins when the UCD90xxx is not powered up?

Sam
Expert 4175 points
Other Parts Discussed in Thread: UCD90120A, UCD9090, UCD90160A, UCD90160, UCD90240, UCD90320U, UCD90120, UCD9090A, UCD90124, UCD90124A, UCD90320

The UCD90xxx device has an internal ESD diode to protect on all IO pins and MON pins. When the UCD90xxx device is not powered by a 3.3-V supply, if a positive voltage is applied to a pin, the ESD diode is forward biased and a leakage current may be observed. If such a scenario can be anticipated, resistors should be used to limit the current flow below 1 mA.

For more FAQ please check the following document.

UCD90xxx Family Frequently Asked Questions and Answers 

UCD9090 UCD9090A UCD90120 UCD90120A UCD90124 UCD90124A UCD90160 UCD90160A UCD90240 UCD90320 UCD90320U