{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2931BDT50","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LM2931BDT50","canonicalUrl":"https://icboms.com/stmicroelectronics/LM2931BDT50","factsUrl":"https://icboms.com/api/mcp/products/LM2931BDT50","rawCanonicalId":null},"summary":{"shortDescription":"onsemi LM2931BDT50, 5V fixed-output LDO regulator, 100mA output, 0.6V dropout max at 100mA, 75dB PSRR at 120Hz, -40°C to 125°C operating range, DPAK (TO-252-3) surface-mount package.","salesMarkdown":"## What this 5V LDO does — and where the 75dB PSRR matters The LM2931BDT50 is a 5V fixed-output low-dropout regulator from onsemi's LM2931 series, delivering up to 100mA with a maximum dropout voltage of 0.6V at full load. ## Dropout headroom and quiescent current — the real-world trade-offs With a 0.6V dropout maximum at 100mA, the input rail needs at least 5.6V to maintain regulation. That 1 mA quiescent current is the price of keeping the pass element biased — it's not a micropower LDO, but the 30 mA supply maximum suggests the internal reference and protection circuits draw very little overhead. Over-current and over-temperature protection are built in — the part shuts down before the die exceeds the 125°C limit, which is a practical safeguard for a regulator that might see a shorted load in a production unit. The DPAK (TO-252-3) package with two leads and a tab is a common footprint, so if you are evaluating a replacement, look for a 5V fixed-output LDO in the same DPAK with a similar dropout and PSRR profile. The 75dB PSRR at 120Hz is the spec most likely to differ between candidates — a generic 78L05 will not match it.","metaTitle":"LM2931BDT50 5V LDO Regulator, 100mA, 75dB PSRR, DPAK","metaDescription":"LM2931BDT50 5V fixed-output LDO regulator from the LM2931 series. 100mA output, 0.6V dropout, 75dB PSRR at 120Hz. -40°C to 125°C range.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"STMicroelectronics","PSRR":"75dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","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)":"-","Supplier Device Package":"DPAK","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d36d329ebe07b2117d1cff0e49ac76c9.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2931BDT50/alternatives.json"},"ai":{"faq":[{"question":"What is the PSRR of LM2931BDT50?","answer":"The LM2931BDT50 has a power-supply rejection ratio of 75 dB at 120 Hz, which is the standard ripple frequency from a full-wave rectifier. That level of rejection is enough to keep 120 Hz hum off a 5V analog rail without a post-filter."},{"question":"What package does LM2931BDT50 come in?","answer":"It is supplied in a DPAK (TO-252-3) surface-mount package with two leads and a tab. The tab is the output (Vout) and provides the primary thermal path to the PCB copper."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LM2931BDT50","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LM2931BDT50 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}}