AT3H4B-CUH-S

AT3H4B-CuH-S is an AOTE phototransistor optocoupler in an SSOP-4 package, from the AT3H4X series in the PC357 / LTV-357 class of compact feedback couplers. It accepts AC/DC bidirectional input up to ±50 mA, provides 3,750 Vrms isolation with more than 7.0 mm creepage, a current transfer ratio spanning 20% to 300% across the series, an 80 V collector-emitter rating, 50 mA collector current, 1.2 V typical / 1.4 V maximum forward voltage and 0.1 V typical / 0.2 V maximum saturation voltage, over −55 to +110 °C; the code decodes as B CTR rank, copper leadframe, halogen-free, SSOP packing at 5,000 per reel. Selection advice: AOTE documents this exact code on the cover of its dedicated B1-revision datasheet (2024); the maker publishes no separate lifecycle status page, so treat the dedicated datasheet plus channel availability as the evidence base, and confirm the CTR rank letter in your RFQ — the rank decides the feedback-loop operating point. Parameters verified against AOTE documentation.