600 V off-state triac coupler for AC load switching
The Toshiba TLP267J(TPL,E is a single-channel triac-output optocoupler in a 6-SOP surface-mount package. It blocks 600 V off-state and provides 3750 Vrms isolation between the LED input and the triac output, making it suited for driving AC loads — solenoids, relays, small motors, and resistive heaters — from low-voltage logic without a separate isolated supply on the load side. The 500 V/µs (typical) static dV/dt immunity means the output triac resists false turn-on from fast mains transients or inductive kickback, a common failure mode in motor-drive and contactor-coil circuits. Turn-on time is 100 µs, fast enough for phase-angle dimming or zero-cross-switched loads at 50/60 Hz. There is no zero-crossing circuit — the triac fires as soon as the LED current exceeds the 3 mA (max) trigger threshold. That gives the designer direct control over the firing angle, which is why this part shows up in lamp dimmers, soft-start circuits, and solid-state relay designs where the turn-on point matters.
Package, footprint, and replacement fit
The 6-SOP package (0.173" body width, 4.40 mm) uses four active leads — two for the LED input, two for the triac output — in the standard SOIC-6 footprint that Toshiba and competitors use across this coupler family. The die and ratings are identical — same 600 V off-state, same 3750 Vrms isolation, same 100 µs turn-on. No PCB change needed.
Forward current and drive requirements
The LED forward voltage is 1.27 V (typical), and the maximum DC forward current is 30 mA. The hold current (Ih) is 200 µA (typical), which keeps the triac latched once triggered through the full AC half-cycle down to light loads. On-state current is rated 70 mA RMS maximum — sized for driving a gate resistor to a larger external triac or a small load directly. For loads above 70 mA, use this coupler to drive the gate of a power triac or back-to-back SCR pair.
Temperature range and approvals
The part carries CQC, cUR, and UR safety approvals, which simplifies certification for equipment sold into North American and Chinese markets.
RoHS-compliant per the listing.