{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TS391IYLT","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"TS391IYLT","canonicalUrl":"https://icboms.com/stmicroelectronics/TS391IYLT","factsUrl":"https://icboms.com/api/mcp/products/TS391IYLT","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics TS391IYLT, Automotive AEC-Q100 series, single general-purpose comparator, 2V to 36V supply, CMOS/DTL/ECL/Open-Collector/TTL output, SOT-23-5 package, -40°C to 125°C.","salesMarkdown":"## Why grab this comparator instead of a generic LM393 That means it's not just a bench part — it's specced for under-hood electronics, engine control modules, transmission sensors, and any environment where the PCB sees under-hood heat cycles or cold starts. The SOT-23-5 package keeps the footprint small enough for dense automotive ECU layouts, and the 2V to 36V single-supply range (or ±1V to ±18V dual) lets it run directly off a 3.3V sensor rail or a 24V truck battery without an extra regulator. ## Supply voltage range — one part for 3.3V, 5V, 12V, and 24V rails The 2V to 36V single-supply range (or ±1V to ±18V split supply) is the headline flexibility spec. In a typical automotive application, the same comparator can monitor a 3.3V MCU supply for undervoltage, check a 5V sensor reference, and flag an overvoltage on a 24V truck battery — all without changing the BOM. The 5mV max input offset voltage at 5V sets the practical threshold resolution: if you're building a window comparator to detect a 4.5V undervoltage on a 5V rail, the offset adds a ±5mV uncertainty, which is fine for most fault-detection margins. The 0.25µA max input bias current means you can feed it from a 100kΩ resistor divider and the voltage error stays under 25µV — no buffer amplifier needed. ## Output compatibility — no level shifter needed The output stage is listed as compatible with CMOS, DTL, ECL, Open-Collector, and TTL logic families. In practice, the open-collector output is the most common configuration for this class of comparator — it lets you pull up to any voltage up to the supply rail, so the output can drive a 3.3V MCU GPIO directly even when the comparator is running from 12V. ## Package and hand-solderability The SOT-23-5 (SC-74A / SOT-753) is one of the more hand-solderable five-pin SMD packages — the leads are on a 0.95mm pitch, visible under a loupe, and you can tack them with a fine-tip iron and flux. No thermal pad underneath, so no via-stitch requirement. For a prototype run or a rework station, this is a practical footprint. The 1.25mA max quiescent current is modest — not a micropower part, but fine for always-on automotive modules where the ignition-off load is handled by a separate sleep circuit. For a new automotive design or a production BOM line, you can qualify it without worrying about an imminent EOL notice. The AEC-Q100 qualification means it's already passed the stress tests (HTOL, TC, HAST, etc.) that automotive Tier-1s require, so the qualification effort for an ECU program is mostly paperwork.","metaTitle":"STMicro TS391IYLT Comparator, AEC-Q100, SOT-23-5","metaDescription":"ST TS391IYLT single general-purpose comparator, AEC-Q100 qualified, -40°C to 125°C, 2V-36V supply, SOT-23-5. Available to order.","metaKeywords":null},"attributes":{"series":"Automotive, AEC-Q100","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"General Purpose","Series":"Automotive, AEC-Q100","Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"CMOS, DTL, ECL, Open-Collector, TTL","Mounting Type":"Surface Mount","Package / Case":"SC-74A, SOT-753","lifecycle_stage":"eol_hot","Number of Elements":"1","Operating Temperature":"-40°C ~ 125°C","Current - Output (Typ)":"16mA @ 5V","Supplier Device Package":"SOT-23-5","Current - Quiescent (Max)":"1.25mA","Current - Input Bias (Max)":"0.25µA @ 5V","Voltage - Input Offset (Max)":"5mV @ 5V","Voltage - Supply, Single/Dual (±)":"2V ~ 36V, ±1V ~ 18V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.66","priceTiers":[{"qty":1,"price":"$1.66000","currency":"USD"},{"qty":10,"price":"$1.49300","currency":"USD"},{"qty":25,"price":"$1.40880","currency":"USD"},{"qty":100,"price":"$1.20020","currency":"USD"},{"qty":250,"price":"$1.12700","currency":"USD"},{"qty":500,"price":"$0.98612","currency":"USD"},{"qty":1000,"price":"$0.93030","currency":"USD"},{"qty":3000,"price":"$0.93030","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/7a10e2a16b14e9208c32e09a2c1d0886.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TS391IYLT/alternatives.json"},"ai":{"faq":[{"question":"Is TS391IYLT equivalent to LM393?","answer":"Functionally, the TS391IYLT is a single-channel general-purpose comparator similar to one section of an LM393 (which is a dual). If your design needs automotive-grade reliability, the TS391IYLT is the correct choice; for a non-automotive bench project, a standard TS391 or LM393 may suffice. Pin compatibility depends on the specific package variant — verify the footprint against your layout."},{"question":"Does TS391IYLT have automotive qualification?","answer":"Yes, the TS391IYLT is part of the Automotive, AEC-Q100 series from STMicroelectronics."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/TS391IYLT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/TS391IYLT 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}}