{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L4940D2T85","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L4940D2T85","canonicalUrl":"https://icboms.com/stmicroelectronics/L4940D2T85","factsUrl":"https://icboms.com/api/mcp/products/L4940D2T85","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L4940D2T85, positive fixed LDO regulator, 8.5V output, 1.5A, 0.9V dropout max, PSRR 68dB (120Hz), -40°C to 150°C, D2PAK (TO-263-3), tube.","salesMarkdown":"## 8.5 V fixed rail, 1.5 A continuous — what it delivers The STMicroelectronics L4940D2T85 is a single-output positive fixed LDO regulator delivering 8.5 V at up to 1.5 A. Maximum dropout is 0.9 V at full load, so the input rail needs to stay above 9.4 V to maintain regulation. Ripple rejection is specified at 68 dB at 120 Hz — useful for post-rectifier filtering in analog supplies where line-frequency hum needs attenuation. Protection features include over-temperature, reverse polarity, and short-circuit, making it resilient in automotive or industrial environments. Housed in a D2PAK (TO-263-3) surface-mount package with two leads and a tab. The exposed tab is the thermal path and is electrically connected to the output.","metaTitle":"STMicroelectronics L4940D2T85 LDO Regulator, 8.5V Fixed","metaDescription":"STMicroelectronics L4940D2T85 positive fixed LDO regulator: 8.5V output, 1.5A, 0.9V dropout max, PSRR 68dB at 120Hz, -40°C to 150°C.","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":"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)":"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/alternatives.json"},"ai":{"faq":[{"question":"What is the PSRR of the L4940D2T85?","answer":"Power supply rejection ratio is 68 dB at 120 Hz. This is the line-frequency ripple rejection — relevant for post-rectifier filtering in analog power supplies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L4940D2T85","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L4940D2T85 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}}