{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM317D2T-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM317D2T-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/LM317D2T-TR","factsUrl":"https://icboms.com/api/mcp/products/LM317D2T-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM317D2T-TR, adjustable positive linear regulator, 1.5 A output, 40 V max input, 1.2 V to 37 V output range, D²PAK (TO-263-3) surface-mount package, tape and reel.","salesMarkdown":"## Sizing the output for your rail The LM317D2T-TR delivers up to 1.5 A continuous output from an adjustable 1.2 V to 37 V range, with a 40 V maximum input. That 1.5 A ceiling is the hard limit for your load budget — if your downstream circuitry pulls 1.2 A nominal, you have 300 mA of headroom before the over-current protection engages, but the thermal rise in the D²PAK package at that current and dropout voltage needs a copper pour on the tab pad to keep junction temperature below the 125 °C max. ## Ripple rejection at line frequency PSRR is specified at 80 dB to 65 dB at 120 Hz — the range reflects the dependence on output voltage setting and load current. At the high end, 80 dB attenuation means a 1 Vpp ripple on the input becomes roughly 0.1 mVpp at the output, which is relevant for analog supplies feeding op-amps or ADCs that run off the same rectified rail. ## Package and reflow reality The D²PAK (TO-263-3) is a surface-mount package with a large exposed tab on the bottom. The tab is the thermal path and the output connection — your PCB footprint must include a thermal pad with vias to inner copper planes.","metaTitle":"LM317D2T-TR STMicroelectronics Adjustable Linear Regulator","metaDescription":"ST LM317D2T-TR adjustable positive linear regulator, 1.5 A output, 40 V max input, 1.2 V to 37 V output range, D²PAK package. Active production, ROHS3.","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":"Tape & Reel (TR) Cut Tape (CT)","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"TO-263-3, D²Pak (2 Leads + Tab), TO-263AB","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":"D²PAK","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"1.2V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.6300","priceTiers":[{"qty":1,"price":"$1.63000","currency":"USD"},{"qty":10,"price":"$1.45700","currency":"USD"},{"qty":25,"price":"$1.38280","currency":"USD"},{"qty":100,"price":"$1.13590","currency":"USD"},{"qty":250,"price":"$1.06188","currency":"USD"},{"qty":500,"price":"$0.93840","currency":"USD"},{"qty":1000,"price":"$0.74084","currency":"USD"},{"qty":2000,"price":"$0.69145","currency":"USD"},{"qty":5000,"price":"$0.65687","currency":"USD"},{"qty":10000,"price":"$0.63218","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/babfa8fd7c14be235df0f227841adf0f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM317D2T-TR/alternatives.json"},"ai":{"faq":[{"question":"Is the LM317D2T-TR equivalent to the LM317T?","answer":"The LM317D2T-TR is the surface-mount D²PAK version of the classic LM317 adjustable regulator. The LM317T is the TO-220 through-hole variant. Electrically they share the same 1.5 A output, 40 V input max, and 1.2 V to 37 V output range, but the packages are not footprint-compatible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM317D2T-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM317D2T-TR 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}}