The Toshiba TLP268J(E is a single-channel triac output photocoupler in a 6-SOIC (4.40 mm width) 4-lead surface-mount package. It combines a GaAs infrared LED with a zero-crossing triac detector, rated for 600 V off-state voltage and 3750 Vrms isolation. The zero-crossing circuit means the triac only turns on near the AC zero-voltage point, which dramatically reduces inrush current and radiated EMI when switching resistive or lightly inductive loads like heaters, solenoid valves, or incandescent lamps.
3750 Vrms isolation and industrial temperature range
The 3750 Vrms isolation voltage qualifies the TLP268J(E for reinforced insulation in mains-connected equipment per IEC 60950-1 and IEC 62368-1, making it suitable for power supplies, motor drives, and industrial controllers where the low-voltage control side must be safely separated from the AC line. The 600 V off-state rating provides ample margin for 240 VAC or 277 VAC line switching, and the typical static dV/dt of 500 V/µs ensures the triac does not falsely trigger on fast mains transients — a common failure point in cheaper couplers.
Package and approvals — a standard footprint with global safety marks
The TLP268J(E comes in a 6-SOIC (0.173", 4.40 mm width) 4-lead package, which is a standard photocoupler footprint shared by many Toshiba and competitor parts — easy to hand-solder or reflow, and straightforward to second-source if needed. It carries CQC, cUR, and UR safety approvals, covering North American and Chinese regulatory requirements for AC-line isolation components. The forward voltage is typically 1.27 V, and the maximum DC forward current is 30 mA, with a typical hold current of 200 µA — the minimum current needed to keep the triac latched after the LED turns off.
Lifecycle and sourcing
If you need a dual-source option for supply resilience, Toshiba offers several pin-compatible triac couplers in the same 6-SOIC 4-lead package — the TLP268J(E) is the low-trigger-current variant (3 mA max Ift), so a direct replacement would need to match that threshold.