{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ULN2803CDWR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ULN2803CDWR","canonicalUrl":"https://icboms.com/texas-instruments/ULN2803CDWR","factsUrl":"https://icboms.com/api/mcp/products/ULN2803CDWR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments ULN2803CDWR, 8 NPN Darlington transistor array, 500 mA per-channel collector current, 50 V collector-emitter breakdown, 1.6 V saturation at 350 mA, 20-SOIC surface-mount package, -65°C to 150°C junction temperature.","salesMarkdown":"## Eight-channel sink driver for relay and solenoid banks The Texas Instruments ULN2803CDWR is an 8-channel NPN Darlington transistor array in a 20-SOIC surface-mount package. Each channel sinks up to 500 mA with a 50 V collector-emitter breakdown, making it the standard choice for driving relay coils, solenoid valves, stepper motor windings, and lamp loads from a PLC digital output or microcontroller I/O pin. The Darlington pair per channel provides high current gain, so the 500 mA load current requires only microamps of base drive from the upstream logic. ## Saturation voltage and thermal budget at full load At 350 mA collector current with 500 µA base drive, the Vce saturation is 1.6 V maximum. This 1.6 V drop at 350 mA dissipates 0.56 W per channel. With all eight channels conducting simultaneously, the total dissipation reaches 4.5 W — the 20-SOIC package on a standard FR-4 board with minimal copper area will exceed the 150°C junction limit without forced airflow or a thermal relief plane. The 50 µA maximum collector cutoff current at 50 V is the leakage when the channel is off — relevant for high-impedance loads where off-state leakage could cause a false trigger. In practice, the 50 µA is negligible for relay and solenoid loads drawing 50–500 mA. The base product number ULN2803 is a long-running TI family with multiple package variants, so the supply channel is mature and the die is not expected to be discontinued without a long PCN window.","metaTitle":"ULN2803CDWR 8-Channel Darlington Driver, 500 mA, 50 V","metaDescription":"Texas Instruments ULN2803CDWR 8 NPN Darlington transistor array. 500 mA per channel, 50 Vceo, 1.6 V saturation at 350 mA.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Power - Max":"-","Mounting Type":"Surface Mount","Package / Case":"20-SOIC (0.295\\\", 7.50mm Width)","Product Status":"Active","Transistor Type":"8 NPN Darlington","lifecycle_stage":"eol_hot","Base Product Number":"ULN2803","Operating Temperature":"-65°C~150°C(TJ)","Frequency - Transition":"-","Supplier Device Package":"20-SOIC","Vce Saturation (Max) @ Ib, Ic":"1.6V @ 500µA, 350mA","Current - Collector (Ic) (Max)":"500mA","Current - Collector Cutoff (Max)":"50µA","DC Current Gain (hFE) (Min) @ Ic, Vce":"-","Voltage - Collector Emitter Breakdown (Max)":"50V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.08069","priceTiers":[{"qty":1,"price":"$1.08069","currency":"USD"},{"qty":10,"price":"$0.89468","currency":"USD"},{"qty":30,"price":"$0.80269","currency":"USD"},{"qty":100,"price":"$0.71071","currency":"USD"},{"qty":500,"price":"$0.65590","currency":"USD"},{"qty":1000,"price":"$0.62651","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0b84f953c1a1c5bcaf6bfa810f573023.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/ULN2803CDWR/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum collector current per channel for ULN2803CDWR?","answer":"Each of the eight Darlington channels can sink 500 mA continuous collector current. The 50 V collector-emitter breakdown voltage and 1.6 V saturation at 350 mA define the safe operating area — derate current when multiple channels are on simultaneously or when ambient temperature exceeds 85°C."},{"question":"What is the difference between ULN2803CDWR and ULN2803A?","answer":"The ULN2803CDWR is the surface-mount 20-SOIC variant, while the ULN2803A is typically the through-hole DIP-18 or DIP-20 version. Both share the same 8-channel Darlington core with 500 mA per-channel rating and 50 V breakdown. The CDWR suffix indicates the SOIC package and Tape & Reel shipping format. The choice is driven by board assembly process — reflow vs wave solder."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ULN2803CDWR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ULN2803CDWR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-13T09:47:52.779Z","lastPublished":"2026-08-13T09:47:52.779Z","indexable":true}}