Optocoupler/LED/nixie tube/photoelectric device

The FODM121 series, FODM124 and FODM2701 include a Gallium Arsenide Infrared Emitting Diode driving a phototransistor within a compact 4-pin micro-flat encapsulation. Lead spacing is 2.54 mm. The FODM2705 consists of two Gallium Arsenide Infrared Emitting Diodes connected in anti-parallel for AC operation.

The 6N135M, 6N136M, HCPL4503M, HCPL2530M, and HCPL2531M optocouplers consist of an AlGaAs LED optically coupled to a high-speed phototransistor. A separate connection for photodiode biasing reduces the base-collector capacitance of the input transistor and is orders of magnitude faster than conventional phototransistors. The HCPL4503M has no internal connection to the phototransistor base, improving noise immunity. Internal interference shielding with excellent common-mode rejection up to 50,000 V/µs.