{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317AEMPX","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317AEMPX","canonicalUrl":"https://icboms.com/texas-instruments/LM317AEMPX","factsUrl":"https://icboms.com/api/mcp/products/LM317AEMPX","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317AEMPX, adjustable positive linear regulator, 1.5A output, 40V input max, 1.25V to 37V output, PSRR 80dB~65dB at 120Hz, SOT-223-4 surface mount, -40°C to 125°C operating temperature.","salesMarkdown":"## Adjustable 1.5A linear regulator in SOT-223-4 The LM317AEMPX is a positive adjustable linear voltage regulator from Texas Instruments, delivering up to 1.5A output current with an input range up to 40V and an adjustable output from 1.25V to 37V. ## PSRR and load regulation for analog rails With a PSRR of 80dB to 65dB at 120Hz, this regulator provides meaningful ripple rejection for powering sensitive analog circuits — op-amp supplies, ADC reference buffers, or sensor front-ends — where line-frequency ripple from a rectified mains supply would otherwise couple into the signal path. The 10 mA quiescent current is typical for a 1.5A-capable linear regulator; it is not a low-Iq part for battery operation, but the trade-off buys better transient response and output noise performance than a switching regulator at this load level. ## NRND — plan the transition That means existing production runs and BOM lines can still be filled through the independent distribution channel, but new designs should migrate to a current-production alternative — typically another LM317-family variant in the same SOT-223-4 footprint. ## SOT-223-4 footprint and thermal layout The SOT-223-4 package (also designated TO-261-4, TO-261AA) is a surface-mount medium-power package. For 1.5A operation at higher input-output differentials, a minimum of 1 in² of 2-oz copper on the top layer is typical to keep the junction below 125°C. The package is supplied in Tape & Reel, ready for automated pick-and-place.","metaTitle":"LM317AEMPX adjustable linear regulator, 1.5A, SOT-223-4","metaDescription":"Texas Instruments LM317AEMPX adjustable positive regulator, 1.5A output, 40V input max, PSRR 80dB~65dB at 120Hz, SOT-223-4, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Tape & Reel (TR)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","Product Status":"Not For New Designs","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":"-40°C~125°C","Voltage - Input (Max)":"40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"SOT-223-4","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.1800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/173f3d20b70e5ad47e70de74c614263c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317AEMPX/alternatives.json"},"ai":{"faq":[{"question":"Is LM317AEMPX obsolete?","answer":"It is not fully discontinued, but it is not recommended for new product designs. Existing BOM lines can still be supplied through the independent channel."},{"question":"What is the replacement for LM317AEMPX?","answer":"Texas Instruments has not published a specific successor order code for the LM317AEMPX. The broader LM317 family includes many pin-compatible variants in the same SOT-223-4 footprint — selecting a current-production LM317 variant with the same output current and voltage range is the typical migration path. Confirm the exact alternate with the manufacturer's cross-reference tool or your TI field representative."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317AEMPX","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317AEMPX 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}}