{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2931AZ50","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM2931AZ50","canonicalUrl":"https://icboms.com/stmicroelectronics/LM2931AZ50","factsUrl":"https://icboms.com/api/mcp/products/LM2931AZ50","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM2931AZ50, fixed 5V positive LDO regulator, 100mA output, 0.6V dropout at 100mA, 75dB PSRR at 120Hz, -40°C to 125°C, TO-92-3 through-hole package.","salesMarkdown":"## Fixed 5V rail for low-current industrial loads The STMicroelectronics LM2931AZ50 is a single-output positive LDO regulator delivering a fixed 5V output at up to 100mA. It is built for through-hole assembly in the TO-92-3 package, a footprint common in legacy industrial controls, sensor modules, and auxiliary bias supplies where board space is not the constraint. The 75dB PSRR at 120Hz makes this part a practical choice for cleaning up rectified line-frequency ripple on a 5V analog rail — think op-amp front-ends or ADC reference supplies where 120Hz hum would otherwise couple into the signal path. Dropout is rated 0.6V max at 100mA, so the input rail needs at least 5.6V to maintain regulation at full load. That headroom is typical for a 7.5V or 9V unregulated bus stepping down to a clean 5V. ## Temperature range and protection set The quiescent current sits at 1 mA typical, which keeps the thermal budget manageable in still-air TO-92-3 mounting. On-chip current limit and thermal shutdown are included — no external clamp diode needed for short-circuit protection on the output. The maximum supply input is 26V, giving ample margin for a 12V or 24V nominal rail. ## Obsolete — sourcing through surplus channels The LM2931AZ50 is listed as obsolete by STMicroelectronics. No direct replacement part number is published on the record. Date-code spread and packaging condition are confirmed at quote time; sealed factory tubes with consistent date codes are the preferred sourcing grade.","metaTitle":"LM2931AZ50 5V Fixed LDO Regulator, 100mA, TO-92-3, Obsolete","metaDescription":"STMicroelectronics LM2931AZ50 fixed 5V LDO regulator, 100mA output, 75dB PSRR at 120Hz, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"75dB (120Hz)","Series":"-","Package":"Bulk","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-226-3, TO-92-3 (TO-226AA)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"100mA","Base Product Number":"LM2931","Protection Features":"Current Limit, Thermal Shutdown","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C~125°C(TJ)","Voltage - Input (Max)":"26V","Voltage Dropout (Max)":"0.6V @ 100mA","Current - Supply (Max)":"30 mA","Voltage - Output (Max)":"-","Supplier Device Package":"TO-92-3","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d36d329ebe07b2117d1cff0e49ac76c9.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the replacement for LM2931AZ50?","answer":"A functionally equivalent fixed 5V LDO in a TO-92-3 package from another manufacturer may be cross-shopped, but no pin-compatible alternate is documented here. The safest path for an existing BOM is to source the original code through the surplus channel."},{"question":"What is LM2931AZ50's listed PSRR?","answer":"The power-supply rejection ratio is 75 dB at 120 Hz — a strong figure for attenuating line-frequency ripple on the output rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM2931AZ50","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM2931AZ50 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T19:09:02.872Z","lastPublished":"2026-07-16T19:09:02.872Z","indexable":true}}