{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2937IMPX-12","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2937IMPX-12","canonicalUrl":"https://icboms.com/texas-instruments/LM2937IMPX-12","factsUrl":"https://icboms.com/api/mcp/products/LM2937IMPX-12","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2937IMPX-12, 12V fixed output positive voltage regulator, 400mA output current, SOT-223-4 surface-mount package, over-temperature, reverse polarity, and short-circuit protection.","salesMarkdown":"## 12 V rail, 400 mA ceiling — what the ratings mean The LM2937IMPX-12 is a fixed 12 V output positive voltage regulator from the LM2937 family, rated for 400 mA continuous output current. The fixed output eliminates the need for external resistor dividers — connect the input, ground, and output pins, and the rail is set. Maximum input voltage is 26 V, so budget at least 2–3 V headroom above 12 V for dropout and line transient margin. ## Dropout and quiescent — the design budget Maximum dropout is 1 V at 50 mA load — this is a standard NPN regulator topology, not an LDO. At full 400 mA the dropout will be higher; the datasheet curve (page 7) shows the typical increase. Quiescent current is 2 mA typical, with a 20 mA supply maximum — the Iq is drawn from the input rail regardless of load, so factor it into the input power budget. Protection features include over-temperature shutdown, reverse polarity protection, and short-circuit current limiting. These are built in — no external clamp diodes or foldback circuits needed for basic robustness in an automotive or industrial auxiliary rail. ## Obsolete — sourcing via independent distribution ## Package and footprint — SOT-223-4 Supplied in a SOT-223-4 surface-mount package (also listed as TO-261-4, TO-261AA). The 12 V fixed output at 400 mA suits auxiliary bias rails for op-amp supplies, relay coils, or sensor interfaces in those temperature ranges.","metaTitle":"LM2937IMPX-12 12V Fixed 400mA Voltage Regulator, SOT-223","metaDescription":"LM2937IMPX-12: 12V fixed output, 400mA positive voltage regulator. SOT-223-4 surface-mount package. Over-temp, reverse polarity, short-circuit protection.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","PSRR":"-","Series":"-","Package":"Tape & Reel (TR)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"400mA","Base Product Number":"LM2937","Protection Features":"Over Temperature, Reverse Polarity, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C~85°C","Voltage - Input (Max)":"26V","Voltage Dropout (Max)":"1V @ 50mA","Current - Supply (Max)":"20 mA","Voltage - Output (Max)":"-","Supplier Device Package":"SOT-223-4","Current - Quiescent (Iq)":"2 mA","Voltage - Output (Min/Fixed)":"12V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/fde2ea9d87633116f7579b8ea9d1fc83.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2937IMPX-12/alternatives.json"},"ai":{"faq":[{"question":"Can LM2937IMPX-12 be replaced with LM2937MPX-12?","answer":"The LM2937MPX-12 is a different package variant within the same LM2937 family. The LM2937MPX-12 is listed in a DDPAK/TO-263 package, while the LM2937IMPX-12 is in SOT-223-4. They are not pin-compatible — the footprint differs. For a drop-in replacement, confirm the package and pinout of your existing board before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2937IMPX-12","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM2937IMPX-12 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}}