Darlington gain at low drive current
The MOC223M is a single-channel Darlington-output optoisolator from onsemi in an 8-SOIC surface-mount package. The Darlington with Base output gives the designer access to the base node for external pull-up or speed-up components, which can reduce the turn-off time below the typical 125 µs when the application needs faster recovery.
Isolation and temperature envelope for industrial I/O
Rated for 2500Vrms galvanic isolation, the MOC223M provides a basic safety barrier between the low-voltage control side and the higher-voltage load side — typical in 24 VDC industrial I/O modules, sensor interfaces, and motor drive feedback circuits. The 8-SOIC package (0.154" body width, 3.90 mm) is a standard surface-mount footprint shared by many optocouplers, making PCB layout straightforward with existing land patterns.
ROHS3 compliant, with no exemption flags. For volume production, confirm the tube-to-reel conversion with your preferred distributor; reel quantities may be available under a different order code.
Switching speed and load drive
Typical rise time is 8 µs and fall time is 110 µs; turn-on is 10 µs, turn-off 125 µs. These figures suit low-frequency switching (relays, solenoid valves, indicator lamps) but are too slow for high-speed serial isolation or PWM above a few kilohertz. The output can sink up to 150 mA continuous at a maximum collector-emitter voltage of 30 V, with a saturation voltage of 1 V at rated current — adequate for driving a 24 V relay coil with a series resistor or a 5 V logic rail through a pull-up.