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The component is supposed to be TCA9517DGKR, a level-shifting I2C bus repeater from Texas Instruments. I got these soldered from a turn-key Chinese fab. The top markings are TI43 (Or T143?) first line, and AYK second line:

enter image description here

The AYK is the correct chip mark for TCA9517. However the chip doesn't function as it should, whatsoever. When powered up as TCA9517, it clamps SDA and SCL lines. As a stand-alone, DMM shows no connectivity between any pins.

[The original (good) chip has a clear first-line mark as TI 6B]. More, the chip has some bottom thermal slug:

enter image description here

I suspect the chip is some medium-power transistor, but wasn't able to find a match. I have 250 of these suckers, and if someone can identify the chip, maybe I can re-use them in some other projects.

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  • \$\begingroup\$ Could it be counterfeits? \$\endgroup\$ – Jeroen3 Mar 30 '18 at 7:12
  • \$\begingroup\$ @Jeroen3, could be, but then the first line is different. And the slug. I still want to believe that it is some procurement mishap, and the chip can do something. \$\endgroup\$ – Ale..chenski Mar 30 '18 at 7:20
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Possibly a TI audio amplifier chip.

enter image description here

Also bears the AYK marking (and has a thermal pad).

enter image description here

This may indeed be a procurement mistake. Perhaps you could share the specifics of the vendor just for general information.

P.S. Try the DMM on diode setting to check ICs. Chances are you will see something on every pin relative to GND, with the (+) probe on GND.

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    \$\begingroup\$ It looks like you are right! In Ohmmeter mode, there is 103k resistance between pins 1 and 7, as per the diagram . And the DMM (Fluke 170) indicates 0.5 -0.6 V between all pins (ESD clamps I guess). Thanks! The chip might be quite useful for me. I wonder though how did you find this match? \$\endgroup\$ – Ale..chenski Mar 30 '18 at 16:57

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