{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L4940D2T85-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L4940D2T85-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/L4940D2T85-TR","factsUrl":"https://icboms.com/api/mcp/products/L4940D2T85-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L4940 series LDO voltage regulator, L4940D2T85-TR, fixed 8.5V output, 1.5A, 0.9V dropout max, 68dB PSRR at 120Hz, D2PAK surface mount, -40 to 150°C.","salesMarkdown":"## Fixed 8.5V rail with 1.5A capability The STMicroelectronics L4940D2T85-TR is a single-output, positive fixed LDO voltage regulator delivering a regulated 8.5V output at up to 1.5A. Maximum dropout is 0.9V at the full 1.5A load, meaning the input must stay at least 0.9V above 8.5V to maintain regulation — a 9.4V minimum input at full current. Power-supply rejection is 68dB at 120Hz, which filters line-frequency ripple effectively for analog loads such as sensor front-ends or audio stages. ## Protection and thermal range for harsh environments On-chip protection includes over-temperature shutdown, reverse polarity protection, and short-circuit current limiting — covering the common fault conditions in automotive and industrial power rails. Quiescent current is 8 mA typical, with a maximum supply current of 50 mA — the 8 mA Iq is reasonable for a 1.5A LDO and does not dominate the thermal budget in always-on circuits. ## D2PAK footprint and tape-and-reel ordering For BOM lines that still specify this exact order code, availability is limited to independent distribution channels.","metaTitle":"STMicroelectronics L4940D2T85-TR LDO Regulator, 8.5V Fixed","metaDescription":"ST L4940D2T85-TR LDO regulator: fixed 8.5V output, 1.5A, 0.9V dropout max, 68dB PSRR at 120Hz, -40 to 150°C, D2PAK.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"68dB (120Hz)","Series":"-","Package":"Tape & Reel (TR)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-3, D²Pak (2 Leads + Tab), TO-263AB","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1.5A","Base Product Number":"L4940","Protection Features":"Over Temperature, Reverse Polarity, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 150°C","Voltage - Input (Max)":"17V","Voltage Dropout (Max)":"0.9V @ 1.5A","Current - Supply (Max)":"50 mA","Voltage - Output (Max)":"-","Supplier Device Package":"D2PAK","Current - Quiescent (Iq)":"8 mA","Voltage - Output (Min/Fixed)":"8.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/9bf57332c4a0608905e2a693da98c415.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L4940D2T85-TR/alternatives.json"},"ai":{"faq":[{"question":"What is the PSRR of L4940D2T85-TR?","answer":"The power-supply rejection ratio is 68dB at 120Hz, which provides effective filtering of line-frequency ripple for sensitive analog loads."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L4940D2T85-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L4940D2T85-TR 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}}