{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ULN2074B","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"ULN2074B","canonicalUrl":"https://icboms.com/stmicroelectronics/ULN2074B","factsUrl":"https://icboms.com/api/mcp/products/ULN2074B","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics ULN2074B, Discrete Semiconductors, 4 NPN Darlington (Quad), 50V Vce, 1.75A Ic, 1W, 16-PowerDIP, Tube.","salesMarkdown":"## Quad Darlington array for inductive loads The STMicroelectronics ULN2074B packs four NPN Darlington pairs into a single 16-PowerDIP, each rated for 1.75 A collector current and 50 V collector-emitter breakdown. This is a classic relay, solenoid, and stepper-motor driver array — the Darlington configuration gives you a gain of several thousand, so a logic-level 2 mA base drive saturates the output at 1.25 A with a Vce(sat) of 1.4 V max. ## Package and thermal considerations The 1 W power ceiling (total across all four channels) sets the thermal budget — at 1.25 A per channel with 1.4 V saturation drop, each channel dissipates roughly 1.75 W under continuous conduction, so the duty cycle or ambient temperature must be managed to stay within the package limit. Operating temperature spans -20°C to 85°C. ## Peer comparison — ULN2075B vs ULN2074B The closest functional sibling is the ULN2075B, which shares the same 4 NPN Darlington topology, 1.75 A switching current, and 1 W power rating in an identical 16-PowerDIP. The deciding difference is the collector-emitter breakdown voltage: 50 V on the ULN2074B versus 80 V on the ULN2075B. If your load rail runs above 50 V, the ULN2075B is the drop-in — same pinout, same footprint, same thermal envelope. The ULN2067B also offers 80 V breakdown with the same current rating and package.","metaTitle":"STMicroelectronics ULN2074B 4 NPN Darlington, 1.75A Ic","metaDescription":"STMicroelectronics ULN2074B quad NPN Darlington array. 50V Vce, 1.75A Ic, 1W max. Active lifecycle, ROHS3 compliant. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tube","Power - Max":"1W","Mounting Type":"Through Hole","Package / Case":"16-PowerDIP (0.300\\\", 7.62mm)","Transistor Type":"4 NPN Darlington (Quad)","lifecycle_stage":"eol_hot","Operating Temperature":"-20°C ~ 85°C (TA)","Supplier Device Package":"16-PowerDIP (20x7.10)","Vce Saturation (Max) @ Ib, Ic":"1.4V @ 2mA, 1.25A","Current - Collector (Ic) (Max)":"1.75A","Voltage - Collector Emitter Breakdown (Max)":"50V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.8","priceTiers":[{"qty":1,"price":"$6.80000","currency":"USD"},{"qty":10,"price":"$6.10500","currency":"USD"},{"qty":25,"price":"$5.77160","currency":"USD"},{"qty":100,"price":"$5.00210","currency":"USD"},{"qty":250,"price":"$4.74560","currency":"USD"},{"qty":500,"price":"$4.25824","currency":"USD"},{"qty":1000,"price":"$4.23500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6ef2d88258ab11cb0908a0228224d4e2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/ULN2074B/alternatives.json"},"ai":{"faq":[{"question":"Will ULN2074B drop into a board that was specified around ULN2075B without rewiring?","answer":"Yes — the ULN2074B and ULN2075B share the same 16-PowerDIP pinout, same 4 NPN Darlington topology, and same 1.75 A current rating. The only difference is the Vce breakdown: 50 V on the ULN2074B versus 80 V on the ULN2075B. If your supply voltage stays below 50 V, the ULN2074B is a direct mechanical and electrical replacement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/ULN2074B","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/ULN2074B 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}}