onsemi, FODM121AR2V Phototransistor Output Optocoupler, Surface Mount, 4-Pin MFP

The FODM121 series, FODM124, and FODM2701 consists of a gallium arsenide infrared emitting diode driving a phototransistor in a compact 4-pin mini-flat package. The lead pitch is 2.54 mm. The FODM2705 consists of two gallium arsenide infrared emitting diodes connected in inverse parallel for AC operation.

More than 5mm Creepage/Clearance
Compact 4-Pin Surface Mount Package (2.4mm Maximum Standoff Height)
Current Transfer Ratio in Selected Groups
DC Input:
FODM121: 50–600%
FODM121A: 100–300%
FODM121B: 50–150%
FODM121C: 100–200%
FODM124: 100% MIN
FODM2701: 50–300%
AC Input:
FODM2705: 50–300%
Applications
Digital logic inputs
Microprocessor inputs
Power supply monitor
Twisted pair line receiver
Telephone line receiver