{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317H","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317H","canonicalUrl":"https://icboms.com/texas-instruments/LM317H","factsUrl":"https://icboms.com/api/mcp/products/LM317H","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317H, adjustable positive linear regulator, 1.5 A output, TO-205AD / TO-39-3 metal can package, PSRR 80 dB ~ 65 dB at 120 Hz.","salesMarkdown":"## Why the TO-3 package matters for this 1.5 A regulator The LM317H is the through-hole, metal-can variant of the classic adjustable positive regulator, rated for 1.5 A continuous output. The TO-3 package — a steel base with a nickel-plated can — conducts heat directly to a chassis or heatsink through the mounting flange, which is the main thermal path. ## Ripple rejection and output range PSRR is 80 dB at 120 Hz, dropping to 65 dB at the same frequency — that 80 dB figure means the output ripple from a full-wave rectified supply is attenuated by a factor of 10,000. For a 1 V p-p ripple on the input, the output sees roughly 100 µV p-p. The adjustable output range spans 1.25 V to 37 V, set by two external resistors. Maximum input is 40 V, so the dropout margin between input and output must be at least 3 V at full load. ## Active production, TO-3 availability The TO-3 package is — no tape-and-reel, so plan for manual or tube-fed placement.","metaTitle":"LM317H Adjustable Linear Regulator 1.5A TO-3 Texas","metaDescription":"LM317H from Texas Instruments: adjustable positive linear regulator, 1.5A output, TO-3 metal can, PSRR 80dB at 120Hz. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","PSRR":"80dB ~ 65dB (120Hz)","Series":"-","Package":"Bulk","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-205AD, TO-39-3 Metal Can","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":"0°C~125°C","Voltage - Input (Max)":"40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"TO-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$20.8000","priceTiers":[{"qty":1,"price":"$20.80000","currency":"USD"},{"qty":10,"price":"$19.12000","currency":"USD"},{"qty":25,"price":"$18.32760","currency":"USD"},{"qty":100,"price":"$16.14800","currency":"USD"},{"qty":250,"price":"$15.35548","currency":"USD"},{"qty":500,"price":"$14.36480","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b684c49c4de21c3d115710a169d23519.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317H/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the LM317H?","answer":"Within the LM317 family, the LM317K (TO-220) and LM317T (TO-220) share the same adjustable regulator core but use a plastic package. The LM317H is the only standard TO-3 metal-can variant — no direct pin-compatible second source exists in a different package. If your board is laid out for the TO-3 footprint, the LM317H is the only drop-in fit."},{"question":"What is the PSRR of the LM317H?","answer":"PSRR is 80 dB typical at 120 Hz, decreasing to 65 dB at the same frequency. That 80 dB figure applies when the output is set to the nominal 1.25 V reference; PSRR degrades as the output voltage is adjusted higher."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317H","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM317H when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}