{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2931AD33R","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM2931AD33R","canonicalUrl":"https://icboms.com/stmicroelectronics/LM2931AD33R","factsUrl":"https://icboms.com/api/mcp/products/LM2931AD33R","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LM2931AD33R, fixed-output positive LDO, 3.3 V, 100 mA, 0.6 V dropout, 78 dB PSRR at 120 Hz, -40 to 125 °C, 8-SOIC surface mount.","salesMarkdown":"The LM2931AD33R delivers 78 dB of power-supply rejection at 120 Hz, the fundamental ripple frequency from a full-wave rectifier. That attenuation factor of roughly 8000× means a 1 Vpp ripple on the input collapses to about 125 µVpp on the 3.3 V output — a clean enough rail for most analog front-ends and sensor bias circuits without a post-filter. The 26 V absolute-max input gives headroom for 12 V and 24 V industrial buses with transient margin. Quiescent current is 1 mA typical — not the lowest in class, but acceptable for always-on control rails where the load current dominates the power budget. The internal current-limit and thermal-shutdown protection handle fault conditions without external clamp diodes. ## Temperature grade and package fit Rated for -40 to 125 °C junction temperature, the LM2931AD33R spans the industrial and automotive temperature envelope — suitable for under-hood electronics, outdoor telecom, or factory-floor control modules that see 105 °C ambient with self-heating margin. The surface-mount package is rework-friendly with a standard hot-air profile and does not require X-ray inspection after reflow. ## Lifecycle and compliance The base number LM2931 covers a family of fixed and adjustable output voltages in the same pinout, so a BOM change to a different voltage variant shares the same PCB footprint. ROHS3 compliant per the manufacturer — no exemptions that would trigger a compliance review for EU or UKCA markets.","metaTitle":"STMicroelectronics LM2931AD33R LDO, 3.3V 100mA, 78dB PSRR","metaDescription":"STMicroelectronics LM2931AD33R fixed 3.3V LDO, 100mA output, 78dB PSRR at 120Hz, 0.6V dropout, -40 to 125°C, 8-SOIC. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"78dB (120Hz)","Series":"-","Package":"Tape & Reel (TR) Cut Tape (CT)","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","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":"8-SOIC","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.2900","priceTiers":[{"qty":1,"price":"$1.29000","currency":"USD"},{"qty":10,"price":"$1.15000","currency":"USD"},{"qty":25,"price":"$1.09160","currency":"USD"},{"qty":100,"price":"$0.89670","currency":"USD"},{"qty":250,"price":"$0.83820","currency":"USD"},{"qty":500,"price":"$0.74074","currency":"USD"},{"qty":1000,"price":"$0.58479","currency":"USD"},{"qty":2500,"price":"$0.54580","currency":"USD"},{"qty":5000,"price":"$0.51851","currency":"USD"},{"qty":12500,"price":"$0.49902","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d36d329ebe07b2117d1cff0e49ac76c9.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2931AD33R/alternatives.json"},"ai":{"faq":[{"question":"What does the 78 dB PSRR rating mean for my circuit?","answer":"The 78 dB PSRR at 120 Hz means the LM2931AD33R attenuates full-wave rectifier ripple by roughly 8000×. A 1 Vpp ripple on the input becomes about 125 µVpp on the 3.3 V output — sufficient to keep analog sensor supplies and low-noise bias rails clean without an additional LC filter stage."},{"question":"What compliance documentation is available for LM2931AD33R?","answer":"The LM2931AD33R is ROHS3 compliant per STMicroelectronics — no exemption-based compliance gaps."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM2931AD33R","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM2931AD33R 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}}