{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ULN2803AN","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ULN2803AN","canonicalUrl":"https://icboms.com/texas-instruments/ULN2803AN","factsUrl":"https://icboms.com/api/mcp/products/ULN2803AN","rawCanonicalId":null},"summary":{"shortDescription":"ULN2803AN, 8 NPN Darlington array, 50V Vce breakdown, 500mA per channel collector current, 1.6V Vce sat @ 500µA Ib / 350mA Ic, 18-DIP through-hole package, -40°C to 85°C industrial temperature range.","salesMarkdown":"The ULN2803AN contains eight NPN Darlington pairs in a through-hole package, each rated for 500 mA continuous collector current and a 50 V collector-emitter breakdown. ## Obsolete — no factory orders, but still on the BOM of legacy PLC and relay boards The manufacturer no longer accepts new orders; the only channel is independent distribution sourcing surplus or last-time-buy inventory. If your BOM still calls out ULN2803AN, you are looking at a broker buy for production fill or repair stock. ## Does it need a heatsink? The 1.6 V saturation voltage tells the story At 350 mA per channel with all eight outputs on, the total power dissipation is roughly 8 × 350 mA × 1.6 V = 4.5 W. In the 18-DIP plastic package with no airflow, that exceeds the free-air thermal capability — the die temperature climbs above 85°C ambient. For continuous duty above 200 mA per channel, a clip-on heatsink or forced air is necessary. For intermittent relay pulsing at 100 mA or less, the package handles it without extra cooling.","metaTitle":"ULN2803AN 8 NPN Darlington Array, 50V 500mA, 18-DIP","metaDescription":"ULN2803AN 8-channel NPN Darlington sink driver. 50V Vce, 500mA per channel, 18-DIP through-hole. Industrial temp -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tube","Power - Max":"-","Mounting Type":"Through Hole","Package / Case":"18-DIP (0.300\\\", 7.62mm)","Product Status":"Obsolete","Transistor Type":"8 NPN Darlington","lifecycle_stage":"eol_hot","Base Product Number":"ULN2803","Operating Temperature":"-40°C~85°C(TA)","Frequency - Transition":"-","Supplier Device Package":"18-PDIP","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":"-","Voltage - Collector Emitter Breakdown (Max)":"50V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/21b2b800bbdd24fddb5cb19410f89e2d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/ULN2803AN/alternatives.json"},"ai":{"faq":[{"question":"Is ULN2803AN obsolete?","answer":"Yes, the product status is Obsolete. No new factory orders are accepted. The only supply channel is surplus or last-time-buy inventory from independent distributors."},{"question":"What is the maximum current per channel of ULN2803AN?","answer":"500 mA continuous collector current per channel. At that level, derating for ambient temperature and the number of active channels is required to stay within the package thermal limits."},{"question":"What is equivalent to ULN2803AN?","answer":"The ULN2804AN is a pin-compatible drop-in with a higher input threshold for CMOS logic. The ULN2802AN is also pin-compatible but designed for 14-25 V PMOS inputs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ULN2803AN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ULN2803AN when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T18:01:29.665Z","lastPublished":"2026-07-16T18:01:29.665Z","indexable":true}}