The Toshiba TLP184(GB-TPR,SE is a single-channel phototransistor optocoupler in a compact 6-SOP package, with a 3750Vrms isolation rating that suits it for galvanic isolation in industrial controls, power supplies, and PLC I/O modules. It accepts both AC and DC input on the LED side, which simplifies designs that need polarity-independent sensing or AC line detection. The transistor output handles up to 80V and 50mA, and the current transfer ratio spans 100% to 600% at 5mA forward current — wide enough to accommodate LED aging and temperature drift without losing the logic state.
The CTR is specified as 100% minimum and 600% maximum at 5mA forward current. That means with 5mA into the LED, the output transistor can sink between 5mA and 30mA — a broad spread that forces the designer to bias the output pull-up for the worst-case (lowest CTR) to guarantee the logic threshold is crossed.
Package and footprint quirks
The package is a 6-SOIC with 0.173" body width and 4.40mm height, but it has only 4 leads.