{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317AT/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317AT-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM317AT-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM317AT%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317AT/NOPB adjustable positive voltage regulator, 1.5 A output, 40 V max input, 1.25 V to 37 V output range, TO-220-3 through-hole package, -40°C to 125°C operating temperature.","salesMarkdown":"## Adjustable linear regulator in a TO-220 — what the ratings mean The Texas Instruments LM317AT/NOPB is a three-terminal adjustable positive voltage regulator delivering up to 1.5 A output current from a 40 V maximum input rail, with an adjustable output range from 1.25 V to 37 V set by two external resistors. It comes in a standard TO-220-3 through-hole package with integral tab for heatsinking — the same footprint used across the LM317 family for decades. ## PSRR at 120 Hz — ripple rejection where it matters PSRR is listed at 80 dB typical, dropping to 65 dB at 120 Hz. That 120 Hz point is the fundamental ripple frequency from a full-wave bridge rectifier — so in a linear post-regulator stage, this part knocks down the bulk-capacitor ripple by a factor of roughly 1800 at 80 dB, still over 1700 at 65 dB. For a 5 V rail with 100 mVpp input ripple, the output sees under 60 µVpp — clean enough for most analog front-end supplies. ## Protection built in — no external watchdog needed Over-current, over-temperature, and short-circuit protection are integrated on-chip. The current-limit and thermal-shutdown circuits are active across the full temperature range, so a sustained output short or a heatsink that's undersized for the dissipation won't cascade into a board-level failure. That makes it a common choice for unregulated DC-input rails where the upstream supply can surge or drop out. The TO-220 package and the LM317 core topology have been in continuous production across multiple suppliers for decades — the supply base is broad and the tooling is mature.","metaTitle":"LM317AT/NOPB adjustable voltage regulator, 1.5 A, TO-220-3","metaDescription":"Texas Instruments LM317AT/NOPB adjustable positive voltage regulator, 1.5 A output, 40 V input max, TO-220-3, -40°C to 125°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"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":"Active","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-220-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.0300","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/173f3d20b70e5ad47e70de74c614263c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317AT%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Does LM317AT/NOPB have short circuit protection?","answer":"Yes — over-current, over-temperature, and short-circuit protection are all integrated. The regulator limits output current and shuts down if the junction temperature exceeds the thermal limit, then auto-recovers when the die cools."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317AT-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317AT-NOPB 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}}