SBX1610
SBX1651
GP1U52X (Sharp)

        ~~~~~~~~~~~~~~~
        |             |
        +-------o-o-o-+
        |       1 2 3 |

        1 - Vout (OC)
        2 - Vcc
        3 - GND

Other sensors have Vout and Vcc reversed between them. The GND pin seems
to be nearest to the case corner always. To find out for sure, connect +5V
through 2 1Kohm resistors to Vcc and Vout each, and GND, then point an IR
remote at the unit and use a 'scope' to determine the real output.

hope this helps,

Peter (plp@actcom.co.il)