{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317KCS","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317KCS","canonicalUrl":"https://icboms.com/texas-instruments/LM317KCS","factsUrl":"https://icboms.com/api/mcp/products/LM317KCS","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317KCS, adjustable positive linear regulator, 1.5 A output, TO-220-3, PSRR 80 dB ~ 65 dB at 120 Hz, Last Buy lifecycle.","salesMarkdown":"The LM317KCS carries a Last Buy status from Texas Instruments, meaning the manufacturer has scheduled end-of-production and is accepting final orders within a defined window. ## 1.5 A output and adjustable range This is a positive adjustable linear regulator delivering up to 1.5 A continuous output. The output voltage adjusts from 1.25 V minimum up to 37 V maximum, set by two external resistors — the classic LM317 topology that needs no fixed tap. The 1.5 A rating is the headline load budget: at full current the TO-220-3 package requires a heatsink sized for the dropout voltage times load, because the junction temperature is rated 0 °C to 125 °C. ## PSRR and ripple rejection Power-supply rejection ratio is specified at 80 dB to 65 dB at 120 Hz. That 80 dB floor at the fundamental ripple frequency of a full-wave rectifier means the output sees roughly 1/10,000th of the input ripple — a practical number for clean analog rails. The 65 dB at the same frequency is the worst-case corner; if your load draws near the 1.5 A limit, expect the lower end of that range. ## Protection features and quiescent current On-chip protection includes over-current, over-temperature, and short-circuit — the regulator survives a sustained output short without damage, though the thermal shutdown cycles until the fault clears. Quiescent current is 10 mA typical; that is the current the regulator burns to run its internal reference and error amp, and it flows to ground regardless of load. In battery-powered designs the 10 mA Iq is a standing drain that must be factored into the standby budget.","metaTitle":"LM317KCS Last Buy – TI Adjustable Regulator 1.5 A TO-220-3","metaDescription":"Texas Instruments LM317KCS adjustable positive linear regulator, 1.5 A output, TO-220-3. Last Buy status – confirm lifecycle before BOM commitment.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Last Buy","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Last Time Buy","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":"$0.8400","priceTiers":[{"qty":1,"price":"$0.90000","currency":"USD"},{"qty":10,"price":"$0.79100","currency":"USD"},{"qty":25,"price":"$0.74280","currency":"USD"},{"qty":100,"price":"$0.60610","currency":"USD"},{"qty":250,"price":"$0.56296","currency":"USD"},{"qty":500,"price":"$0.47912","currency":"USD"},{"qty":1000,"price":"$0.38330","currency":"USD"},{"qty":2500,"price":"$0.34736","currency":"USD"},{"qty":5000,"price":"$0.33900","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6e4aef63b3328a11f0a16987811b26d6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317KCS/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317KCS","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317KCS when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T18:05:40.909Z","lastPublished":"2026-07-17T18:05:40.909Z","indexable":true}}