{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L4940D2T12-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L4940D2T12-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/L4940D2T12-TR","factsUrl":"https://icboms.com/api/mcp/products/L4940D2T12-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L4940D2T12-TR, 12V fixed-output LDO, 1.5A, D2PAK-3, 61dB PSRR at 120Hz, 0.9V max dropout at 1.5A.","salesMarkdown":"## Active production — stable sourcing for 12V rail designs The L4940D2T12-TR: Sourced per RFQ through standard distribution; no stock-holding claim, but the lifecycle posture means lead times should track normal production runs. ## Dropout headroom and PSRR for post-rectifier rails Maximum dropout voltage is 0.9 V at 1.5 A output — that sets the minimum pre-regulator voltage. The 17 V input maximum gives some transient headroom on a 12 V bus. PSRR is 61 dB at 120 Hz, which is the line-frequency ripple rejection you get after a bridge rectifier. That figure drops at higher frequencies, so for switching-noise rejection you will want additional post-filtering or a second-stage LDO. The fixed 12 V output eliminates the feedback divider noise that an adjustable regulator would inject. ## Protection set and thermal envelope Built-in protection covers over-temperature, reverse polarity, and short circuit. Quiescent current is 8 mA typical; the maximum supply current is 50 mA. ## D2PAK footprint and mounting Surface-mount D2PAK (TO-263-3) with two leads plus the tab.","metaTitle":"L4940D2T12-TR – STMicro 12V 1.5A LDO, D2PAK, Active","metaDescription":"STMicroelectronics L4940D2T12-TR: 12V fixed output, 1.5A LDO, 0.9V max dropout, 61dB PSRR at 120Hz. Active production, D2PAK package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"61dB (120Hz)","Series":"-","Package":"Tape & Reel (TR) Cut Tape (CT)","Output Type":"Fixed","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":"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)":"12V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.0500","priceTiers":[{"qty":1,"price":"$2.16000","currency":"USD"},{"qty":10,"price":"$1.93700","currency":"USD"},{"qty":25,"price":"$1.82720","currency":"USD"},{"qty":100,"price":"$1.55680","currency":"USD"},{"qty":250,"price":"$1.46176","currency":"USD"},{"qty":500,"price":"$1.27902","currency":"USD"},{"qty":1000,"price":"$1.20662","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5d1f86b98937b9a0551c7b690bdb36d2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L4940D2T12-TR/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L4940D2T12-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L4940D2T12-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}}