Triac coupler for 240 VAC line isolation
The Toshiba TLP265J(TPL,E is a single-channel triac-output optocoupler in a 6-pin SOIC package, designed to switch AC loads from a low-voltage logic signal while providing reinforced galvanic isolation. Its 600 V off-state voltage rating gives comfortable headroom for 240 VAC line switching, and the 3750 Vrms isolation meets the reinforced insulation requirements for industrial power supplies, motor drives, and appliance controls. The non-zero-crossing output means the triac fires immediately when the LED current exceeds the 10 mA trigger threshold, giving the designer full phase-angle control for dimmers, soft-start circuits, and heater regulation.
Rated for 70 mA RMS — small loads only
The on-state current is rated at 70 mA RMS maximum, so this part is sized for low-power loads: driving a small relay coil, a solid-state relay input, an indicator lamp, or a gate-drive transformer. It is not intended for direct switching of motors, heaters, or solenoids. The 1 mA typical holding current ensures the triac stays latched once triggered, even with a light load. The static dV/dt immunity of 500 V/µs (typical) is a key parameter when switching inductive loads like relays or transformers — it prevents the triac from falsely triggering on the fast voltage transient that appears when the load is switched off. This rating is well above the typical 200 V/µs requirement for most industrial environments.
20 µs turn-on — timing matters
With a 20 µs turn-on time, the TLP265J(TPL,E can be used in phase-control loops where the MCU fires the triac at a specific point in the AC cycle. The delay is short enough for most dimming and heating applications but should be accounted for in the control algorithm if sub-cycle precision is needed.
Package and rework: 6-SOIC, 4 leads
The surface-mount SOIC footprint is straightforward to hand-solder or reflow, and the package is small enough to fit dense layouts.
Safety approvals and lifecycle
The TLP265J(TPL,E carries CQC, cUR, and UR safety approvals, which simplifies global equipment certification for industrial and appliance applications.