Seeking Datasheet for 53A3P IC -- Switching IC Used in Appliances

[Callixus]

Hi!

The subject line says it all. It's just a silly old 8 pin IC used in things like old Cuisinart coffeemakers to turn things on and shut things off. For the experience I am spending way too much time repairing one such coffeemaker, but I'm learning a lot.

Thanks!

[Callixus]

I want to add that I already searched AllDataSheets.com, even found likely leads for the datasheet, which all sent me back to AllDataSheets, etc. AllDataSheets was a red-herring: These links would pull up components with similar part numbers, but they were not even ICs or anything close. Thanks for any help!

[R_J]

Post a picture of the ic, what case type? if it is used to control the unit it is likely a custom programed microprocessor ic.

[Callixus]

I would, but honestly, it's just an old DIP, PTH IC chip. It's not a programmable device at all. It does some switching. The timing is apparently controlled by a couple of transistors external to it. It's pretty dumb: It just powers a relay that in turn fires up the coil that boils the water and also keeps the pot warm. It's just an old, clunky, DIP chip . . . And, it's so old that I cannot find a datasheet for it! Thanks, and I'll do it if you really want to see it . . .

[R_J]

It might be an optocoupler or Precision Analog Switch (as stated by one website) The ic can be ordered if you suspect it is bad.

I also found these specs but they may not be correct

Part Number	53A3P
Type	Precision Analog Switch
Supply Voltage	±5V to ±18V (Dual Supply) or 10V to 36V (Single Supply)
On Resistance	2.5Ω max at VDD = ±15V, TA = 25°C
Off Leakage	1nA max at VDD = ±15V, TA = 25°C
Bandwidth	4MHz (-3dB)
Switching Time	10ns (Typical)
Input Signal	Analog and Digital

If YOU want to provide clear pictures of both sides of the board, I'm sure it can be confirmed what the ic does.

[Callixus]

Thank you! I had taken a picture of the chip itself as you suggested, and can send a couple of the board too. But, for now, here's the chip, and, as you can see, you've already identified it. It just controls the relay that controls the heating coil once a momentary contact switch is pressed. (It also runs the LED in that switch.) Once the transistors do their thing, they send a signal shutting it off.

Here it is . . .

[Callixus]

OK, sorry for the delay. I am not master of my time right now. Here are the photos, front and back, of the board. Note that as to the availability of the chip, it is not actually available in the general sense. I was only able to order one that was apparently stripped out of something -- i.e., a used chip. Yes, it shows up as available, but follow those links and you too will probably not find it. (Although if I knew what I were doing I would also be able to immediately specify a $0.35 chip that does the same thing and that is produced today . . .) The photos:

[R_J]

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