{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LP3966ES-3.3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LP3966ES-3.3","canonicalUrl":"https://icboms.com/texas-instruments/LP3966ES-3.3","factsUrl":"https://icboms.com/api/mcp/products/LP3966ES-3.3","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LP3966ES-3.3, ultra-low-dropout positive fixed regulator, 3.3V output, 3A, TO-263-6 DDPAK, enable control, over-current/over-temperature/short-circuit protection, -40°C to 125°C.","salesMarkdown":"## 3A fixed-output LDO for power-sensitive rails The LP3966ES-3.3 from Texas Instruments is a single-output, positive fixed 3.3V LDO regulator rated for 3A continuous output. The maximum dropout voltage is 1.2V at the full 3A load. ## Dropout voltage at 3A — what it means for the rail budget The 1.2V maximum dropout at 3A is the number that decides whether this part works in a given power chain. ## Package and thermal handling for 3A The LP3966ES-3.3 comes in a TO-263-6 (D2Pak) surface-mount package with an exposed tab that must be soldered to a copper plane for heat sinking. At 3A output with a 1.2V dropout, the power dissipated is roughly 3.6W — that heat has to go somewhere. The DDPAK footprint on a 2oz copper board with adequate via stitching can keep the junction temperature within the -40°C to 125°C operating range. Without that thermal path, the over-temperature protection will cycle the output. ## Active production — no LTB concern for new builds The LP3966ES-3.3 carries an active lifecycle status. There is no last-time-buy notice, no end-of-life announcement, and no successor part number to track. For a BOM freeze or a new design, this part does not introduce obsolescence risk. ## Protection features for fault-tolerant rails Over-current, over-temperature, and short-circuit protection are all on-chip. If the output is shorted to ground, the current limit engages; if the die temperature exceeds the threshold, the thermal shutdown latches the output off until it cools. These are the same protection set used in automotive-grade LDOs, and they let the part survive a fault without external crowbar or fuse circuitry.","metaTitle":"LP3966ES-3.3 LDO Regulator, 3.3V Fixed Output, 3A, DDPAK","metaDescription":"LP3966ES-3.3 3A ultra-low-dropout regulator, fixed 3.3V output, 1.2V max dropout at 3A, -40°C to 125°C, active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-6, D²Pak (5 Leads + Tab), TO-263BA","lifecycle_stage":"eol_hot","Control Features":"Enable","Current - Output":"3A","Protection Features":"Over Current, Over Temperature, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"7V","Voltage Dropout (Max)":"1.2V @ 3A","Current - Supply (Max)":"15 mA","Supplier Device Package":"DDPAK/TO-263-5","Current - Quiescent (Iq)":"9 mA","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.73","stockQuantity":0,"priceTiers":[{"qty":67,"price":"$4.50000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/057d264ee5ffa31b9b463d785e360f0e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does LP3966ES-3.3 include overcurrent and thermal protection features?","answer":"Yes, the LP3966ES-3.3 integrates over-current, over-temperature, and short-circuit protection. These are built-in and do not require external components."},{"question":"What are reliable equivalent or replacement parts for LP3966ES-3.3?","answer":"The LMS1587IS-3.3/NOPB is a functional peer with the same 3A output, fixed 3.3V, and similar protection set, though it lacks the enable control feature of the LP3966ES-3.3. The LP5907UVX-3.3/NOPB is a lower-current (250 mA) alternative for lighter loads. Neither is a direct pin-for-pin replacement; verify the pinout and enable logic before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LP3966ES-3.3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LP3966ES-3.3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}