What the TLP293(E delivers in an isolated design
The Toshiba TLP293(E is a single-channel photocoupler with a DC-input LED driving a phototransistor output, packaged in a 6-SMD gull-wing surface-mount package (6-MFSOP, 4 leads). Its 3750Vrms isolation voltage suits it for galvanic isolation in industrial controls, power supplies, and PLC I/O modules where you need to break ground loops or protect low-voltage logic from high-side transients. The transistor output is rated for 80V and 50mA continuous, with a Vce saturation of 300mV max at the rated current — enough headroom to drive a CMOS or TTL gate input directly without a buffer.
CTR spread and switching speed — the real-world fit
The current transfer ratio spans 50% to 600% at a forward current of 5mA. That wide spread means you design the pull-up resistor and logic threshold for the minimum CTR, not the typical — at 50% CTR the output transistor pulls about 2.5mA collector current from a 5mA LED drive, which still saturates a standard CMOS input. Rise and fall times are 2µs typical, turn-on and turn-off times 3µs typical, so this part handles data rates up to roughly 100 kbps — fine for status signals, relay drives, or slow serial links, but not for high-speed isolated SPI or CAN.
Temperature range and operating environment
That puts it in scope for avionics, downhole instrumentation, and outdoor telecom gear that sees cold starts and hot enclosures. The LED forward voltage is 1.25V typical; derate the forward current to stay within the 50mA absolute maximum at the high end of the temperature range.
Lifecycle and compliance
No official second source or successor is listed, but the standard 6-SMD photocoupler footprint is shared by several vendors; if you need a dual-source option, the TLP185 or TLP290 series from Toshiba are in the same package family and similar CTR bins.