SN74AVC20T245: ICC test data is on the high side

Suri Chen

Part Number: SN74AVC20T245

Tool/software:

Hello，

I purchased the part of SN74AVC20T245DGGR. Under the test condition that the supply voltage is 3.3V, the ICCA value is as high as 228uA,and the ICCB is as high as 22484uA.

Can you suggest why above problem is occuring?

Thanks

Suri

5 months ago

0 Clemens Ladisch 5 months ago

Guru 294230 points

Do all inputs have a valid logic voltage, or are they floating?

0 Suri Chen 5 months ago in reply to Clemens Ladisch

Prodigy 120 points

Hi Clemens,

Yes，all inputs have a valid logic voltage.

And we also test the part, it also has a higher Icc when all inputs have floating.

Thanks,

Suri

0 Michael Ikwuyum 5 months ago in reply to Suri Chen

TI__Mastermind 36955 points

Hi Suri,

Please note that floating can observe higher current.
By valid logic voltage, please ensure VCCA, VCCB and Vi are at a known voltage (GND or VCC) for the lower current, thanks.

Best Regards,

Michael.

0 Suri Chen 5 months ago in reply to Michael Ikwuyum

Prodigy 120 points

Hi Michael,

The test condition: vcca=vccb=3.3V, vih=vcc, vil=gnd.

Because the ICC is tested, there is no limit to the current. The test results showed that the ICCA is as high as 228uA,and the ICCB is as high as 22484uA.

Can you suggest the reasons?

Thanks,

Suri

0 Jack Guan 5 months ago in reply to Suri Chen

TI__Mastermind 30346 points

Hi Suri,

Please confirm if anomaly is seen on multiple units and that a continuity check is performed to ensure no shorts between pins.

Regards,

Jack

0 Suri Chen 5 months ago in reply to Jack Guan

Prodigy 120 points

Hi Jack,

There is no shorts between pins, and all other parameters are normal, only ICC.

Thanks,

Suri

0 Jack Guan 5 months ago in reply to Suri Chen

TI__Mastermind 30346 points

Hi Suri,

Is this behavior consistent with multiple units, with I/Os biased to known, DC state? How about leakage current testing with /OE high (disabled state) and Ioff?

Regards,
Jack

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SN74AVC20T245: ICC test data is on the high side