{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317KCE3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317KCE3","canonicalUrl":"https://icboms.com/texas-instruments/LM317KCE3","factsUrl":"https://icboms.com/api/mcp/products/LM317KCE3","rawCanonicalId":null},"summary":{"shortDescription":"ON Semiconductor LM317KCE3, adjustable positive voltage regulator, 1.5A output, 40V max input, 1.25V to 37V output range, PSRR 80dB~65dB at 120Hz, TO-220-3 through-hole package, 0°C to 125°C operating temperature.","salesMarkdown":"## 1.5A adjustable regulator — the bench-fit decision The LM317KCE3 is a three-terminal adjustable positive voltage regulator from ON Semiconductor, delivering up to 1.5A output current with an output range from 1.25V to 37V, set by two external resistors. The 40V maximum input voltage gives headroom for unregulated supplies up to 28V nominal rails, and the 80dB to 65dB PSRR at 120Hz tells you how much mains ripple the regulator rejects — useful when the input comes from a rectified transformer winding rather than a switching preregulator. ## Obsolete — replacement planning ## Protection and thermal envelope Built-in protection covers overcurrent, overtemperature, and short-circuit conditions — the regulator folds back current and shuts down before the die exceeds safe junction temperature. The 10 mA quiescent current is typical for this generation of adjustable regulators; it adds 0.5W dissipation at 40V input even with no load, so the TO-220 tab needs a heatsink for sustained output above a few hundred milliamps.","metaTitle":"LM317KCE3 Adjustable Positive Voltage Regulator, 1.5A","metaDescription":"LM317KCE3 adjustable positive voltage regulator, 1.5A output, 40V input max, PSRR 80dB~65dB at 120Hz, TO-220-3 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Packaging":"Tube","Output Type":"Adjustable","Part Status":"Obsolete","Mounting Type":"Through Hole","Package / Case":"TO-220-3","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1.5A","Base Product Number":"LM317","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"0°C ~ 125°C","Voltage - Input (Max)":"40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"TO-220-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7200","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/6e4aef63b3328a11f0a16987811b26d6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317KCE3/alternatives.json"},"ai":{"faq":[{"question":"Is LM317KCE3 obsolete and what are my replacement options?","answer":"Yes, the LM317KCE3 is obsolete. No official successor is listed, but the LM317 family is a standard three-terminal adjustable regulator with many pin-compatible equivalents from TI, ST, Microchip, and others — any TO-220 LM317 with the same adjust-output-input pinout will work as a drop-in replacement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317KCE3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317KCE3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}