SN74AHCT14: Output leakage current at power off

Cera Wei

Intellectual 2010 points

Part Number: SN74AHCT14

Hi Team,

May I know the output leakage current at power off when using SN74AHCT14PWR? Thanks!

Regards,

Cera

over 2 years ago

+1 Clemens Ladisch over 2 years ago

Guru 302780 points

AHCT outputs have clamping diodes to V_CC. Applying a voltage to a powered-off output will result in a high current that can easily exceed the absolute maximum rating of 20 mA.

0 Cera Wei over 2 years ago in reply to Clemens Ladisch

TI__Intellectual 2010 points

Hi Ladisch,

Do you mean it's not suggested to apply a voltage at the output pin? if it's powered off, and there's a voltage at Vo, what's the leakage current through Vo to GND?

Regards,

Cera

0 Clemens Ladisch over 2 years ago in reply to Cera Wei

Guru 302780 points

There is no current limit. If the voltage is larger than the forward voltage of the diode, the current will be extremely large (for a short time, until the diode has gone up in smoke).

0 Owen Westfall over 2 years ago in reply to Cera Wei

TI__Genius 10601 points

Hi Cera,

Above is the abs max table for this device and what the internals look like. As you can see if a voltage higher than VCC is applied it can and likely will damage that diode and damage the device.

Logic

Logic forum

SN74AHCT14: Output leakage current at power off