Replacement for the L603C

Cockus Blockus. :(
DENIED!!!

At left: The very common ULN2803; picture borrowed from Adafruit Industries, who sell them for $1.95 a pop.

The Harris Z16HD+ transmitter at work has a bunch of these STMicro L603C Darlington arrays all over in weird places where Harris decided to run things unnecessarily off the +50-60V PA power supplies.

Original part datasheet: L603C
T
he L603C’s max voltage is 90V.

The only replacement I have found so far that has a suitably high voltage rating: SG2823J. SG2800 series (SG2823)

It’s $65 a piece at Digi-Key!

At this point the question can be raised of “how much is that piece of equipment REALLY worth to you?”. If you need to replace an L603C that is used in a lower voltage application (voltages below 50V), the common, inexpensive ULN2803 is your chip! (See link above.) If you need that high voltage, though, prepare to open your wallet a bit wider than usual…

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