Triac-output optoisolator for AC load switching
The onsemi MOC3052SVM is a 1-channel optoisolator with a triac output, rated for 600 V off-state voltage and 4170 Vrms isolation. It is designed to drive AC loads — resistive or inductive — from a low-voltage logic signal, with the triac providing the switching element on the load side. The absence of a zero-crossing circuit means the triac fires at any point in the AC cycle, which is useful for phase-angle control or applications where the load must turn on immediately regardless of the line voltage phase.
Key ratings that govern the fit
The 600 V off-state voltage defines the maximum AC line voltage the triac can block when off — suitable for 240 VAC or 277 VAC nominal lines with margin. A minimum static dV/dt of 1 kV/µs ensures the triac does not falsely trigger from fast voltage transients on the AC line — a common concern when switching inductive loads like motors or solenoids. The 220 µA typical holding current means the triac stays latched once triggered until the load current drops below that threshold near the AC zero-cross. Forward voltage is 1.18 V typical, and the LED can handle up to 60 mA continuous.
Housed in a 6-SMD Gull Wing package, the MOC3052SVM is a surface-mount part intended for reflow soldering. The supplier device package is 6-SMD, and the part ships in tube packaging — which is the standard for hand-loading or small-batch assembly. For tape-and-reel quantities, check the base product number MOC305 for alternate suffix options. The part is ROHS3 compliant and carries UR and VDE approvals, which simplifies compliance for equipment shipped into North American and European markets.
Active lifecycle and sourcing
Sourced through authorized distribution channels. The tube packaging is the standard ordering code for this variant; if your line prefers tape-and-reel, the MOC305 family offers that option under a different suffix.