{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L4940D2T10","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L4940D2T10","canonicalUrl":"https://icboms.com/stmicroelectronics/L4940D2T10","factsUrl":"https://icboms.com/api/mcp/products/L4940D2T10","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L4940D2T10, fixed 10V output LDO, 1.5A, 0.9V dropout max, PSRR 62dB at 120Hz, TO-263-3 D2PAK, -40°C to 150°C, over temp/reverse/short protection.","salesMarkdown":"## Fixed 10V 1.5A LDO for harsh environments The STMicroelectronics L4940D2T10 is a fixed 10V output, positive-voltage linear regulator delivering 1.5A continuous current in a TO-263-3 (D2PAK) surface-mount package. It integrates over-temperature, reverse-polarity, and short-circuit protection, making it suited for automotive and industrial power rails where a stable 10V bus is needed and board area is tight. Maximum dropout voltage is 0.9V at 1.5A load, so the input must stay above 10.9V to maintain regulation. PSRR is 62dB at 120Hz, which provides roughly 1 mV ripple rejection per volt of ripple at the input — useful when the LDO follows a full-wave rectifier without active filtering. ## Obsolescence and sourcing reality The L4940D2T10 is officially obsolete per the manufacturer. ## Temperature range and protection set The integrated protection — over-temperature, reverse polarity, and short circuit — reduces external clamp and shutdown circuitry, simplifying the BOM for a rugged 10V rail.","metaTitle":"STMicroelectronics L4940D2T10 10V Fixed LDO, 1.5A, TO-263-3","metaDescription":"STMicroelectronics L4940D2T10 fixed 10V LDO, 1.5A output, 0.9V dropout max, PSRR 62dB at 120Hz, TO-263-3 D2PAK.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"62dB (120Hz)","Series":"-","Package":"Tube","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)":"10V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/9e669032fd9062911627497cda172ec7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L4940D2T10/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L4940D2T10","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L4940D2T10 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}}