LTV-217-B-G

LTV-217-B-G is a transistor-output optocoupler from LITEON in SOP-4, with the ordering structure verified against the maker’s documentation: the B is the current-transfer-ratio rank, and the -G suffix is the halogen-free form. Verified figures for the B rank: a current transfer ratio of 130 % to 260 % 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 80 V minimum, isolation voltage of 3750 Vrms, and an operating range of −55 °C to +110 °C. The selection point is guaranteed transfer-ratio banding in a surface-mount 4-pin body: the rank, not the family headline, is what sets the output current an isolated feedback or signal path can budget. Selection advice: LTV-217 ranks are separate order codes — the C-rank sibling transfers 200 % to 400 % — so a rank substitution changes the gain of an isolated feedback loop and must be requalified, not treated as a drop-in. Parameters verified against the LITEON LTV-217 documentation (B-rank row).