The Toshiba TLP292(GB-TPL,E is a single-channel phototransistor optocoupler in a 4-SOIC surface-mount package. It accepts both AC and DC input on the LED side, which makes it useful for sensing line-voltage zero-crossing or detecting relay states in industrial controls, motor drives, and power-supply feedback loops. The 3750Vrms isolation rating provides a basic safety barrier for reinforced insulation in mains-connected equipment.
The 3750Vrms isolation voltage is the primary safety spec — it determines whether this part meets the creepage and clearance requirements for a given mains-voltage class. For a 240VAC application, 3750Vrms is typical for basic isolation; if reinforced isolation is needed, you may need a higher-rated device. The current transfer ratio (CTR) is specified as 100% minimum and 600% maximum at 5mA forward current. That wide window means the output transistor can saturate with a modest LED drive, but the gain variation across units must be accounted for in the pull-up resistor and noise margin. A 10kΩ collector load with 5mA input gives a solid logic-level output across the full CTR range. The 80V output breakdown and 50mA continuous output current handle typical 24V PLC inputs and low-power relay drivers without extra buffering. Rise and fall times are 2µs and 3µs typical, which limits the switching speed to about 100 kHz — fine for 50/60 Hz line sensing, relay feedback, and isolated serial data at 9600 baud, but not for high-speed digital isolation.
Package and footprint
The supplier device package is 4-SO. The surface-mount body is suitable for automated assembly and reflow soldering.