{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317T-DG","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM317T-DG","canonicalUrl":"https://icboms.com/stmicroelectronics/LM317T-DG","factsUrl":"https://icboms.com/api/mcp/products/LM317T-DG","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM317T-DG, adjustable positive linear voltage regulator, 1.2 V to 37 V output, 1.5 A continuous, TO-220-3 through-hole package, active production, ROHS3 compliant.","salesMarkdown":"## Adjustable 1.5 A positive regulator in TO-220 The LM317T-DG is a three-terminal adjustable positive voltage regulator from STMicroelectronics, delivering up to 1.5 A output current with an output voltage adjustable from 1.2 V to 37 V via two external resistors. Input voltage can go up to 40 V, and the device includes built-in over-current, over-temperature, and short-circuit protection — reducing the need for external supervisory circuitry. ## PSRR and ripple rejection for noise-sensitive loads Power supply rejection ratio is specified at 80 dB to 65 dB at 120 Hz — the higher figure at low frequencies means the regulator attenuates mains ripple well, but the drop at higher frequencies matters if the input rail carries switching noise above a few kilohertz.","metaTitle":"LM317T-DG STMicroelectronics Adjustable Linear Regulator","metaDescription":"STMicroelectronics LM317T-DG adjustable positive voltage regulator, 1.2V to 37V output, 1.5A, TO-220-3. Active, ROHS3 compliant. PSRR 80dB~65dB at 120Hz.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","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":"0°C~125°C","Voltage - Input (Max)":"40V","Voltage Dropout (Max)":"-","Voltage - Output (Max)":"37V","Supplier Device Package":"TO-220","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.2V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9500","priceTiers":[{"qty":1,"price":"$0.95000","currency":"USD"},{"qty":10,"price":"$0.85300","currency":"USD"},{"qty":25,"price":"$0.81000","currency":"USD"},{"qty":100,"price":"$0.66530","currency":"USD"},{"qty":250,"price":"$0.62192","currency":"USD"},{"qty":500,"price":"$0.54962","currency":"USD"},{"qty":1000,"price":"$0.47758","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/babfa8fd7c14be235df0f227841adf0f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317T-DG/alternatives.json"},"ai":{"faq":[{"question":"Is LM317T-DG a direct replacement for the standard LM317T?","answer":"Yes — the LM317T-DG is functionally identical to the standard LM317T and shares the same TO-220-3 pinout. The '-DG' suffix indicates ST's ROHS3-compliant version. It is a direct drop-in for any LM317T socket."},{"question":"Does LM317T-DG require a heatsink at 1.5 A output?","answer":"At 1.5 A with a typical input-output differential of 3 V, the device dissipates about 4.5 W. The TO-220 package junction-to-ambient thermal resistance is around 50–65 °C/W without a heatsink, which would exceed the 125 °C maximum junction temperature. A heatsink is required for continuous operation at or near 1.5 A."},{"question":"What protection features does LM317T-DG include?","answer":"The regulator integrates over-current limiting, over-temperature shutdown, and short-circuit protection — all internal, no external components needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM317T-DG","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM317T-DG 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}}