{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2931CT/LF03","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2931CT-LF03","canonicalUrl":"https://icboms.com/texas-instruments/LM2931CT-LF03","factsUrl":"https://icboms.com/api/mcp/products/LM2931CT%2FLF03","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2931CT/LF03, positive adjustable LDO regulator, 100 mA output, 55 dB PSRR at 120 Hz, 0.3 V dropout at 100 mA, TO-220-3 through-hole package, -40°C to 85°C operating temperature.","salesMarkdown":"The LM2931CT/LF03 is a positive adjustable low-dropout regulator from Texas Instruments, delivering up to 100 mA with a dropout voltage of 0.3 V at full load. Its 55 dB PSRR at 120 Hz provides meaningful ripple rejection on rectified AC or switching supply inputs, keeping the output clean for sensitive analog loads. The single regulator is configured for positive output and includes over-temperature, reverse polarity, and short-circuit protection — reducing the need for external clamp diodes or crowbar circuits in harsh environments. ## Dropout and quiescent current — the battery-budget numbers With a maximum dropout of 0.3 V at 100 mA, the LM2931CT/LF03 maintains regulation with only 300 mV of headroom above the output voltage. This suits post-battery or post-rectifier rails where the input sags under load. Quiescent current is 1 mA typical, rising to 15 mA maximum under heavy supply current — a reasonable idle draw for always-on automotive or industrial circuits. Input voltage range extends to 26 V, covering nominal 12 V and 24 V industrial buses with margin. The TO-220-3 package (through-hole) allows heatsinking for continuous 100 mA operation at elevated ambient temperatures up to 85°C.","metaTitle":"LM2931CT/LF03 LDO Regulator, Adjustable Output, TO-220-3","metaDescription":"LM2931CT/LF03 positive adjustable LDO, 100 mA output, 55 dB PSRR at 120 Hz, 0.3 V dropout. TO-220-3, -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","PSRR":"55dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Adjustable","Mounting Type":"Through Hole","Package / Case":"TO-220-3","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"100mA","Base Product Number":"LM2931","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)":"0.3V @ 100mA","Current - Supply (Max)":"15 mA","Voltage - Output (Max)":"24V","Supplier Device Package":"TO-220-3","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/a1fc1fb26b34914a47369a4f360231c6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2931CT%2FLF03/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for LM2931CT/LF03?","answer":"No official replacement or successor is recorded in the lifecycle data for the LM2931CT/LF03. For a pin-compatible alternative within the LM2931 family, the LM2931CT/NOPB is a lead-free variant that shares the same TO-220-3 footprint and electrical specifications — confirm the output voltage configuration and protection features match your design before substituting."},{"question":"What is LM2931CT/LF03's listed PSRR?","answer":"The LM2931CT/LF03 provides 55 dB of power-supply rejection ratio at 120 Hz, which attenuates rectified AC ripple by a factor of approximately 560."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2931CT-LF03","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM2931CT-LF03 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}}