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TS5A23166

Harry Trietley
Prodigy 80 points
Other Parts Discussed in Thread: TS5A23166

Question #1: Does the TS5A23166 have any known failure modes or weaknesses?

I am using it in a new circuit I am designing. The original breadboard, built on a Radio Shack experimenter's board, works fine. I laid out a supposedly identical 4-layer prototype PC board and see repeated failures. Typically the circuit works for a few minutes or maybe up to an hour, then the TS5A23166 fails for no apparent reason, even when the circuit is just running on the bench, unattended.

The circuit runs at 5Vdc. The original breadboard is powered directly from a 5V lab supply. The prototype PC board includes an LM78L05A regulator to drop 9V to 5V, but most recently I removed the regulator and ran the board directly from the same 5V lab supply. I also added current limiting resistors (a few hundred ohms) around the inputs, outputs and control inputs, but still get failures.

I am searching for differences between the breadboard and prototype circuits but have not found any yet, so I thought I'd post this question. The application is continuous industrial measurement, so reliability is critical.

Question #2: Are there similar analog gates with higher voltage ratings or which might be more rugged? I need response times of a few nanoseconds and "on" resistances of a few ohms. I am not switching power. The signals are under 5Vac at about 100kHz, with currents under 1 mA.

Thank you

  • 0
    Prodigy 80 points

    This is from the person who originally posted the question. I have found the problem. It is not the IC.

    It was a soldering & board cleanliness problem. We were hand soldering this small IC to prototype boards using solder paste. Apparently some paste was getting under the body of the IC and, eventually, causing shorts or low-resistance paths between adjacent pads. We found that cleaning the board and/or reheating the pads would clear the short and the circuit would again operate. The interesting thing is that the failures did not happen immediately, but took from a few minutes to an hour or more to develop. In fact, sometimes the failure would reoccur and an additional cleaning or reheating would be needed.

    Case closed!