Home > Posts > Pin-out for TSOP1736 and TSOP2138 IR receiver ICs

Pin-out for TSOP1736 and TSOP2138 IR receiver ICs

Some time ago one of our two air-conditioning units stopped working: it would just startup when plugged-in to the mains, but not respond to any commands via the remote control. The air-con repair guy who came unscrewed its cover and used some manual control buttons located in there to operate it, so he unplugged a small IR (infrared) Receiver module and took it for repair.

After some weeks of not having called us, we called the air-con repair guy and found out that he had trouble with finding spare parts for the burned-out IR receiver sensor (an Integrated Circuit [IC] in fact). He could find a new part (see TSOP1736 below) instead of the old part (see TSOP2138 below), but people at the electronics shop told him that they had heard from other clients that this was not exactly pin-compatible and that pins should be cross-connected to the original pin sockets. Moreover, the shop people weren’t sure of the connectivity, neither told the guy the IC names I think.

Doing a bit of research I came across two useful articles (click on the respective images below to visit them) showing some DIY IR receiver projects that had the needed drawings and pin-outs.

TSOP1736 pin-out TSOP2138 pin-out
TSOP1736 pin-out TSOP2138 pin-out

Not sure why those are called TSOP, look more like SIP package visually to me, judging from an IC Package Types guide I came across. Anyway, it seems one has to cross-connect the leftmost and rightmost pins when replacing one of those IC types for another. Have to be careful to add some insulation around the middle pin (that is the positive voltage in both cases) so that the crossed pins don’t touch it.

The positive voltage is 5V as used in TTL, but might work with the lower 3.3V used in CMOS. Speaking of voltage and IC Logic families, I found the following two resources useful regarding voltage translation:

Some other useful links I came across while researching the above issue are the following:

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  1. Kapil
    2012/12/17 at 19:17

    Wrong pin outs !!! i successfully burnt out my IR receiver !!!

    • 2012/12/17 at 19:27

      the repair technician has tried it with our air-conditioning unit and it worked fine. Maybe you short-circuited something?

  2. 2013/11/16 at 12:56

    Seems there is a new one in the market, TSP31230 that has pinout (and shape) same as the TSOP1736. If you see http://www.alldatasheet.com/datasheet-pdf/pdf/252279/VISHAY/TSOP31230.html it keeps the – (GND) and + (Vs) pins close together at the left (as you look at it facing the IR window size), with the Vs pin in the middle and the S (Signal) / Out pin separate at the right handside

    • 2014/07/22 at 11:40

      wonder why nobody enforces some standardization on the pin layout at IR receiver chips, here is another one I found for TSOP32238: http://datasheet.octopart.com/TSOP32238.-Vishay-datasheet-539648.pdf – this is same as TSP2138 in pinout (and reverse order from TSOP1736)

      btw, I was thinking that instead of crossing pins, if they’re long enough one could place the receiver to face the other way around, then bend it over (so that it is vertically reversed, it shouldn’t mind)

    • 2014/11/07 at 10:52

      Just saw another one (not sure what model it was, but it looked like TSOP2138 but bulkier and with metal enclosing) that had V0 (data) on the left, GND at the middle and Vc (positive voltage) at the right as you face its IR window

      So you have to place reverse facing that IR chip when replacing it with a TSOP1736, apart from swapping locations for the Positive voltage and GND pins (twisting them)

  3. 2013/11/16 at 12:57

    BTW, http://www.lirc.org/receivers.html (Linux IR receiver page) has useful schematics for connecting such sensors to a PC (e.g. to serial RS-232C port)

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