{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317K STEEL/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM317K-STEEL-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM317K-STEEL-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM317K%20STEEL%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM317K STEEL/NOPB, adjustable positive voltage regulator, 1.5A output, 37V max input, PSRR 80dB ~ 65dB at 120Hz, TO-204AA (TO-3) steel through-hole package, 0°C to 125°C operating temperature.","salesMarkdown":"## Ripple rejection that justifies the linear regulator choice The LM317K STEEL/NOPB is Texas Instruments' adjustable positive voltage regulator in the through-hole TO-204AA (TO-3) steel package. Its headline spec is the PSRR of 80 dB to 65 dB at 120 Hz — that's the ripple rejection a designer picks a linear regulator for over a noisy switcher, and it holds across the full 1.25 V to 37 V output range. ## 1.5 A output in a package that needs a heatsink Rated for 1.5 A continuous output with a 37 V max input, this is a power part that demands thermal management. The TO-3 steel case is the classic two-screw flange-mount package — it bolts to a chassis or dedicated heatsink, and the tab is the output terminal. The 10 mA quiescent current is typical for a three-terminal regulator of this generation; the thermal budget is dominated by the (Vin - Vout) × Iout drop, not the Iq. ## Protection and temperature range for bench and industrial gear Built-in overcurrent, overtemperature, and short-circuit protection make this a rugged choice for benchtop supplies, industrial control boards, and legacy equipment repair. Listed as active with a current lifecycle stage. This part is still in regular production, which means the buyer is not chasing last-time-buy lots or surplus date-code stock. The STEEL/NOPB suffix confirms the steel TO-3 package and lead-free (NOPB) finish — the standard RoHS-compliant variant.","metaTitle":"Texas Instruments LM317K STEEL/NOPB adjustable regulator","metaDescription":"Texas Instruments LM317K STEEL/NOPB adjustable positive voltage regulator. 1.5A output, 37V max input, PSRR 80dB ~ 65dB at 120Hz. TO-204AA (TO-3) steel package.","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":"Tray","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-204AA, TO-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":"0°C~125°C","Voltage - Input (Max)":"37V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"TO-3-2","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$108.3700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e56db9281768e7250cecd9c037344ff0.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317K%20STEEL%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"What is the PSRR of LM317K STEEL/NOPB and why does it matter?","answer":"That means at 120 Hz mains ripple, the regulator attenuates the input ripple by a factor of 10,000 to 1,800 — the key spec that makes a linear regulator the right choice over a switching regulator in noise-sensitive analog supplies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM317K-STEEL-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/LM317K-STEEL-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}}