ULN2803ADW

ULN2803ADW is a Texas Instruments 8-channel Darlington transistor array in 18-pin SOIC, 50 V / 500 mA per channel — for driving relays, solenoids and low-side loads from logic outputs. Eight integrated Darlington pairs with freewheeling clamp diodes is the selection point: one chip replaces eight transistor-plus-diode circuits, with TTL/CMOS-compatible inputs. Selection advice: lifecycle warning — TI has issued a discontinuance notice for the ULN2803ADW and ULN2803ADWR (18-pin SOIC DW), with no last-time buy offered, because assembly sites are dropping 18-pin SOIC support; the replacement is a 20-pin SOIC device that is not pin-to-pin compatible. For new designs, do not lay out the 18-pin DW footprint — use the 20-pin replacement or the PDIP ULN2803AN for through-hole; for repairs and legacy builds we source remaining 18-pin DW stock. Evidence: TI product discontinuance notification PDN 20220914000.3 (14 September 2022) confirms ULN2803ADW/ADWR discontinuance with no last-time buy offered, and names the 20-pin SOIC ULN2803CDWR as the replacement, pin-to-pin match: No. Match the full ULN2803ADW code.