{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ULN2803A","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"ULN2803A","canonicalUrl":"https://icboms.com/stmicroelectronics/ULN2803A","factsUrl":"https://icboms.com/api/mcp/products/ULN2803A","rawCanonicalId":null},"summary":{"shortDescription":"UMW ULN2803A, 8 NPN Darlington transistor array, 50 V Vce, 500 mA per channel, 18-DIP (0.300\", 7.62 mm) through-hole package, -20°C to 150°C junction temperature.","salesMarkdown":"## Eight Darlington pairs in a single DIP The Darlington configuration delivers a minimum DC current gain of 1000 at 350 mA, so a 500 µA base drive saturates the output to 1.6 V typical — enough headroom to drive relays, solenoids, stepper-motor windings, or incandescent lamps directly from a 5 V logic output. ## 50 V / 500 mA per channel — load-switching ceiling Each of the eight outputs can sink 500 mA continuous, with the total package power limited to 2.25 W. The 50 V Vce breakdown covers 24 V industrial loads with margin for inductive flyback; the integrated suppression diodes clamp the kickback on relay coils and motor windings without external catch diodes. The 1.6 V saturation at 350 mA means the load supply rail must be at least 1.6 V above the load's minimum operating voltage. ## Through-hole 18-DIP — board-level fit The 18-DIP (0.300\", 7.62 mm) through-hole package mates with standard 0.100-inch pitch sockets or solders directly into plated through-holes. The 2.54 mm pin spacing is compatible with prototyping boards and legacy industrial controller layouts. Junction temperature range of -20°C to 150°C covers most factory-floor and outdoor telecom enclosures; derate the 2.25 W package power above 25°C per the datasheet curve.","metaTitle":"ULN2803A 8 NPN Darlington Array, 50 V 500 mA, 18-DIP","metaDescription":"ULN2803A 8 NPN Darlington transistor array, 50 V Vce, 500 mA per channel, 18-DIP package. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"UMW","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tube","Power - Max":"2.25W","Mounting Type":"Through Hole","Package / Case":"18-DIP (0.300\\\", 7.62mm)","Product Status":"Active","Transistor Type":"8 NPN Darlington","lifecycle_stage":"eol_hot","Base Product Number":"ULN2803","Operating Temperature":"-20°C ~ 150°C (TJ)","Frequency - Transition":"-","Supplier Device Package":"18-DIP","Vce Saturation (Max) @ Ib, Ic":"1.6V @ 500µA, 350mA","Current - Collector (Ic) (Max)":"500mA","Current - Collector Cutoff (Max)":"-","DC Current Gain (hFE) (Min) @ Ic, Vce":"1000 @ 350mA, 2V","Voltage - Collector Emitter Breakdown (Max)":"50V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.7100","priceTiers":[{"qty":1,"price":"$1.14000","currency":"USD"},{"qty":10,"price":"$1.01500","currency":"USD"},{"qty":25,"price":"$0.96320","currency":"USD"},{"qty":100,"price":"$0.79110","currency":"USD"},{"qty":250,"price":"$0.73952","currency":"USD"},{"qty":500,"price":"$0.65354","currency":"USD"},{"qty":1000,"price":"$0.51596","currency":"USD"},{"qty":2000,"price":"$0.48675","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d45d0fb16f9f0d1f4ccb53c7b5e84fce.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/ULN2803A/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between ULN2803A and ULN2003?","answer":"The ULN2803A is an 8-channel Darlington array in an 18-pin DIP; the ULN2003 is a 7-channel array in a 16-pin DIP. The ULN2803A provides one additional output channel, which matters when driving an 8-relay bank or an 8-phase stepper motor without needing a second device."},{"question":"Is ULN2803A a direct replacement for ULN2803?","answer":"The ULN2803A is the standard suffix variant of the base ULN2803 family. Electrical ratings — 50 V, 500 mA per channel, 1.6 V saturation — are identical. The 'A' suffix typically indicates a tighter Vce(sat) or improved hFE specification; check the specific datasheet revision for your ULN2803 to confirm drop-in compatibility."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/ULN2803A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/ULN2803A when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}