{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317AMDT","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317AMDT","canonicalUrl":"https://icboms.com/texas-instruments/LM317AMDT","factsUrl":"https://icboms.com/api/mcp/products/LM317AMDT","rawCanonicalId":null},"summary":{"shortDescription":"LM317AMDT, adjustable positive voltage regulator, 1.5 A output, 40 V input max, 37 V output max, PSRR 80 dB ~ 65 dB (120 Hz), TO-252-3 surface-mount package, -40 °C to 125 °C operating temperature.","salesMarkdown":"No official successor part is listed on the record. ## 1.5 A adjustable output — what it covers This is a single-output positive adjustable linear regulator with a 1.5 A current rating. The output range is 1.25 V minimum to 37 V maximum, with a 40 V maximum input. ## PSRR and protection — why the 80 dB matters The PSRR is specified at 80 dB typical at 120 Hz, dropping to 65 dB at higher frequencies. That 80 dB at line frequency gives you solid ripple rejection from a rectified AC supply — useful if you are feeding a sensitive analog front-end or an ADC reference. The built-in over-current, over-temperature, and short-circuit protection mean it will survive a bench fault or a field overload without letting the magic smoke out. ## TO-252-3 — surface-mount swap on site The package is TO-252-3 (DPak), a surface-mount part with a tab for heat sinking. It is not socket-friendly, so a field swap means hot air or a soldering iron with a large tip. The tab is the output pin, so the board copper pour is part of the thermal path. Orientation is straightforward — the tab is the big metal pad, and the three leads are in a row. If you are carrying a field kit, bring a pre-tinned replacement and a hot-air station; this is not a part you swap with tweezers and a soldering iron on a customer site without a bench.","metaTitle":"LM317AMDT Adjustable Regulator, 1.5A, TO-252-3, NRND","metaDescription":"LM317AMDT adjustable positive voltage regulator, 1.5A output, 40V input max, PSRR 80dB at 120Hz. TO-252-3 SMD. NRND lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","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":"TO-252-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.8100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/173f3d20b70e5ad47e70de74c614263c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317AMDT/alternatives.json"},"ai":{"faq":[{"question":"Is LM317AMDT obsolete?","answer":"That means it is still available for existing production but is on the path to end-of-life. Plan a replacement for any new design."},{"question":"What is the replacement for LM317AMDT?","answer":"No official successor is listed on the record. A functionally equivalent replacement would be a standard LM317 adjustable regulator in a compatible package — such as the LM317MDT or LM317T in TO-220, depending on your board footprint and thermal requirements."},{"question":"What is the difference between LM317AMDT and LM317?","answer":"The LM317AMDT is a specific surface-mount variant in the TO-252-3 (DPak) package, while the base LM317 part number covers multiple package options including the through-hole TO-220. The electrical specs — 1.5 A output, 1.25 V to 37 V adjustable range, 40 V input max — are the same across the family. The 'A' suffix typically denotes a tighter initial tolerance or a higher-grade temperature range; this one is rated -40 °C to 125 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317AMDT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317AMDT 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}}