{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2931D","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM2931D","canonicalUrl":"https://icboms.com/stmicroelectronics/LM2931D","factsUrl":"https://icboms.com/api/mcp/products/LM2931D","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2931D, positive adjustable LDO regulator, 100 mA output, 0.6 V dropout, PSRR 80 dB at 120 Hz, -40 to 125 °C, 8-SOIC surface mount.","salesMarkdown":"The Texas Instruments LM2931D is a positive adjustable low-dropout regulator delivering up to 100 mA. ## 80 dB PSRR — what it means for a noise-sensitive rail The LM2931D's PSRR is specified at 80 dB at 120 Hz — this is the ripple-rejection figure that matters when the regulator is feeding an analog front-end or a precision reference from a rectified line-voltage supply. 80 dB at 120 Hz means the 100/120 Hz ripple from a full-wave rectifier is attenuated by a factor of 10,000, keeping the output clean enough for a 12-bit ADC or an op-amp chain without a post-filter stage. ## Dropout voltage and quiescent current — sizing the headroom Maximum dropout is 0.6 V at the full 100 mA load. That sets the minimum input-to-output differential: if you need a regulated 5 V rail, the input must stay above 5.6 V worst-case. Quiescent current is 1 mA typical, rising to 30 mA max under heavy load — the Iq is low enough for always-on rails in battery-backed equipment but not ultra-low-power territory. The LM2931D is listed as obsolete. No official successor order code appears on the record. For a BOM line that still calls out this exact number, the supply path runs through independent distribution — last-time-buy inventory and surplus stock.","metaTitle":"LM2931D LDO Regulator, Adjustable, 100mA, SOIC-8, PSRR 80dB","metaDescription":"LM2931D positive adjustable LDO, 100mA output, 0.6V dropout, PSRR 80dB at 120Hz. SOIC-8 surface mount, -40 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":"80dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"100mA","Base Product Number":"LM2931","Protection Features":"Over Current, Over Temperature","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)":"25.4V","Supplier Device Package":"8-SOIC","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"2.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d36d329ebe07b2117d1cff0e49ac76c9.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the replacement for LM2931D?","answer":"No official replacement or successor order code is listed on the record. For a pin-compatible drop-in, you would need to evaluate other adjustable LDOs in the SOIC-8 footprint with a similar 100 mA rating and 0.6 V dropout — but no direct cross-reference is documented for this part."},{"question":"What is LM2931D's listed PSRR?","answer":"PSRR is specified at 80 dB at 120 Hz. This is the ripple rejection at the fundamental power-supply frequency — the figure that determines how much 100/120 Hz ripple from a rectifier passes through to the output."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM2931D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM2931D when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T19:13:41.870Z","lastPublished":"2026-07-16T19:13:41.870Z","indexable":true}}