{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LF50ABV","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"LF50ABV","canonicalUrl":"https://icboms.com/stmicroelectronics/LF50ABV","factsUrl":"https://icboms.com/api/mcp/products/LF50ABV","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics LF50ABV LDO voltage regulator, 5V fixed output, 500mA, TO-220-3 through-hole, 0.7V dropout, PSRR 76dB to 60dB (120Hz to 10kHz), -40°C to 125°C.","salesMarkdown":"## 5V rail from a 5.7V minimum input The LF50ABV is a 5V fixed-output positive LDO from STMicroelectronics, delivering 500 mA continuous with a maximum dropout of 0.7 V at full load. That means the input rail must stay above 5.7 V across line and load to keep the output in regulation — a 5V logic rail fed from a 6V battery or a 6.5V intermediate bus has comfortable headroom, but a 5.2V pre-regulator does not. The PSRR profile — 76 dB at 120 Hz, rolling off to 60 dB at 10 kHz — tells you where this regulator cleans up noise. It attenuates 120 Hz rectifier ripple by a factor of ~6300, but a 100 kHz switching converter ripple sees only ~32 dB of rejection. Downstream of a buck converter, plan an LC filter ahead of the LDO if the switching frequency sits above 10 kHz. The quiescent current is 1 mA typical, rising to 12 mA max under supply — the 1 mA Iq is low enough for always-on modules on a 24 V bus, but not battery-sleep levels. ## Package and board-fit: TO-220-3 vs surface-mount sibling The LF50ABV comes in a TO-220-3 through-hole package. The tab is the output (Vout), so the heatsink or PCB copper plane connects to the 5V rail — not ground. For a 500 mA load with 1V dropout, dissipation is 0.5 W; the TO-220 junction-to-ambient thermal resistance (~65°C/W without a heatsink) keeps the die below 125°C at 25°C ambient, but at 85°C ambient you need a clip-on heatsink or a dedicated copper area on the board. The board spins for a TO-220 cannot accept a DPAK without a layout change, but the electricals swap one-for-one. STMicroelectronics lists the LF50ABV as Active (current production). There is no last-time-buy clock running, and no successor part has been announced. For a production BOM, this means no urgent redesign needed — but the TO-220 package is increasingly rare in new designs, so if your procurement team is consolidating toward SMT, the DPAK sibling (LF50ABDT-TR) is the natural migration path. The part is ROHS3 compliant.","metaTitle":"STMicroelectronics LF50ABV LDO Regulator, 5V 500mA TO-220","metaDescription":"ST LF50ABV: 5V fixed-output LDO, 500mA, 0.7V dropout, PSRR 76dB-60dB (120Hz-10kHz). Active, through-hole TO-220-3. Sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"76dB ~ 60dB (120Hz ~ 10kHz)","Package":"Tube","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-220-3","lifecycle_stage":"eol_hot","Current - Output":"500mA","Protection Features":"Over Current, Over Temperature","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C ~ 125°C","Voltage - Input (Max)":"16V","Voltage Dropout (Max)":"0.7V @ 500mA","Current - Supply (Max)":"12 mA","Supplier Device Package":"TO-220","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.44","priceTiers":[{"qty":1,"price":"$1.44000","currency":"USD"},{"qty":10,"price":"$1.29000","currency":"USD"},{"qty":25,"price":"$1.22440","currency":"USD"},{"qty":100,"price":"$1.00590","currency":"USD"},{"qty":250,"price":"$0.94032","currency":"USD"},{"qty":500,"price":"$0.83098","currency":"USD"},{"qty":1000,"price":"$0.72205","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/09a96f0847e61297455c4d6a1951f9cf.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LF50ABV/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for LF50ABV?","answer":"The LF50ABDT-TR is the surface-mount (DPAK) sibling with identical electrical ratings: 5V fixed output, 500 mA, same PSRR and protection features. The through-hole LF50ABV and the DPAK LF50ABDT-TR are not footprint-compatible, but the electrical characteristics match one-for-one."},{"question":"What compliance documentation does STMicroelectronics provide for LF50ABV?","answer":"The LF50ABV is ROHS3 compliant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/LF50ABV","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/LF50ABV 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}}