{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L4940D2M5-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L4940D2M5-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/L4940D2M5-TR","factsUrl":"https://icboms.com/api/mcp/products/L4940D2M5-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L4940D2M5-TR, fixed 5V LDO voltage regulator, 1.5A output, 68dB PSRR at 120Hz, 0.9V dropout max, D2PAK (TO-263-3) surface-mount package, -40°C to 150°C.","salesMarkdown":"## Fixed 5V LDO with 68 dB PSRR — the noise-sensitive rail choice The L4940D2M5-TR from STMicroelectronics is a fixed 5 V positive-output LDO regulator delivering up to 1.5 A. ## Dropout and thermal — the real-world headroom numbers Maximum dropout voltage is 0.9 V at 1.5 A load, so the input rail must stay above 5.9 V worst-case to maintain regulation. ## Protection and temperature range On-chip protection covers over-temperature, reverse polarity, and short circuit — three failure modes that kill unguarded regulators in field returns. ## Obsolete — sourcing the L4940D2M5-TR today STMicroelectronics lists the L4940D2M5-TR as obsolete. No direct successor or pin-compatible second source is recorded in the official documentation. Housed in a D2PAK (TO-263-3) surface-mount package with two leads and a tab — the tab is the ground path and primary heat sink. The exposed copper pad on the PCB must be sized for the 1.5 A load and the junction-to-ambient thermal resistance; a 2 oz copper pour under the tab is the usual starting point.","metaTitle":"L4940D2M5-TR 5V LDO Regulator, 1.5A, D2PAK, Obsolete","metaDescription":"STMicroelectronics L4940D2M5-TR fixed 5V LDO, 1.5A output, 68dB PSRR at 120Hz, D2PAK package, -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":"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)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8181","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/9e669032fd9062911627497cda172ec7.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L4940D2M5-TR/alternatives.json"},"ai":{"faq":[{"question":"Is the L4940D2M5-TR obsolete?","answer":"Yes — STMicroelectronics lists the product status as Obsolete. No official replacement or successor order code has been published."},{"question":"What package is the L4940D2M5-TR in?","answer":"D2PAK (TO-263-3) surface-mount package with two leads and a tab, supplied in Tape & Reel."},{"question":"What is the PSRR of the L4940D2M5-TR?","answer":"68 dB at 120 Hz — a strong figure for an LDO of this output current, useful for cleaning up switcher ripple on analog supply rails."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L4940D2M5-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L4940D2M5-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}}