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|
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:
- Logic Voltage Thresholds for TTL, CMOS, LVCMOS, and GTLP IC’s
- IC Logic Level Translation Description for different logic families
Some other useful links I came across while researching the above issue are the following:
- Forum for Electronics, Projects, Power, Schematics, Circuits, Books, Microcontrollers, ASIC, DSP
- Control your PC with a Serial Infrared Receiver – a PIC project
- Solder instruction and circuit of the USB IR receiver
- USB Ultra Infrared Receiver to remote control and power on/off the PC
- PC modding guides
- Building an Infrared Transmitter for Your PC – Hardware Secrets
- MODEL 490-90 / MICRO LINK™ “PLASMA FRIENDLY” INFRARED RECEIVER
- LIRC – Serial Port Receivers
- Chip Directory
- Electronics Acronyms