LTV-357T-C

LTV-357T-C is a transistor-output optocoupler from LITEON in SOP-4, with the ordering structure verified against the maker’s documentation: the T denotes the miniflat tape form and the C is the current-transfer-ratio rank. Verified figures for the C rank: a current transfer ratio of 200 % to 400 % at 5 mA input current and 5 V collector-emitter voltage, input forward voltage of 1.2 V typical and 1.4 V maximum, collector-emitter breakdown of 35 V minimum, isolation voltage of 3750 Vrms, and an operating range of −55 °C to +100 °C — the manual’s absolute-maximum figure, not the wider range some distributor listings print for the family. The selection point is rank-banded transfer gain in the 357 miniflat family: the guaranteed band, not the family headline, sets the output current an isolated feedback or signal path can budget. Selection advice: the rank letter is part of the specification — design the loop budget around the 200 % minimum rather than the 400 % ceiling, and match the full LTV-357T-C string when approving a substitute. Parameters verified against the LITEON LTV-357T documentation (C-rank row).