ULN2803A

ULN2803A is an eight-channel Darlington transistor array from UMW in the maker’s SOP-18 body — UMW package code SOP-18-375-1.27, halogen-free, tape and reel — with the bare code verified as the maker’s own order string in its datasheet product table; the same UMW book lists a DIP form (ULN2803AN) and a TSSOP form (ULN2803AT) as separate codes, and neither is this page. Verified figures are UMW’s own: output voltage of 50 V maximum, continuous output current of 500 mA per channel, collector-emitter saturation voltage of 0.9 V typical and 1.1 V maximum at 100 mA and 1.3 V typical and 1.6 V maximum at 350 mA, input-on voltage maxima of 2.4 V, 2.7 V and 3.0 V by channel current, clamp-diode forward voltage of 1.7 V typical and 2.0 V maximum at 350 mA, output leakage of 20 µA maximum at 25 °C, and an operating range of −40 °C to +85 °C. The selection point is eight low-side drivers with integral clamp diodes for relays, lamps and stepper phases on a logic-level input. Selection advice: the ULN2803A designation originates with Texas Instruments, whose own 18-pin SOIC code carries a discontinuance notice elsewhere in this catalog — TI’s documentation and lifecycle position do not govern this UMW code, so qualify against the UMW rows above and state the maker in the RFQ. Parameters verified against the UMW ULN2803A datasheet.