Triac and SCR Output Photocouplers

Function: Used for AC load switching and phase control by isolating low-voltage control circuits from high-voltage AC systems.

Types:

• Triac Output Photocoupler: Contains a light-triggered triac output. Ideal for AC switching in dimmers, motor controls, and solid-state relays.
• SCR Output Photocoupler: Uses a light-sensitive SCR (thyristor). Used in high-power phase-controlled rectifiers and industrial controls.

Key Features:

• Galvanic isolation
• High noise immunity
• Zero-crossing or random-phase types (for triac)
• Reinforced insulation ratings

Typical Applications:

Motor speed control, lamp dimming, heater control, AC power regulation, PLC I/O modules.

Common Part Numbers:

MOC3021 (random-phase triac driver), MOC3041 (zero-crossing), MOC3063 (high-noise immunity), IL400 (SCR output).