{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT3973IMSE#TRPBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT3973IMSETRPBF","canonicalUrl":"https://icboms.com/analog-devices/LT3973IMSETRPBF","factsUrl":"https://icboms.com/api/mcp/products/LT3973IMSE%23TRPBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LT3973IMSE#TRPBF step-down buck regulator, adjustable output, 750 mA, 4.2-42 V input, 10-MSOP-EP package, Tape & Reel.","salesMarkdown":"## 750 mA buck with a 42 V input ceiling The LT3973IMSE#TRPBF is a step-down switching regulator from Analog Devices, built around a current-mode, fixed-frequency buck topology. Its 4.2 V to 42 V input range covers 12 V and 24 V industrial rails with headroom for transients; the 42 V abs-max means a 24 V nominal bus that glitches to 36 V during a load-dump stays inside the safe operating area without an external clamp. The single adjustable output delivers up to 750 mA, with the feedback set point at 1.21 V minimum and a 24 V maximum ceiling. ## Package and thermal: 10-MSOP with exposed pad Housed in a 10-lead MSOP with an exposed pad (3.00 mm width), the part relies on the paddle for heat sinking. The junction temperature range is -40°C to 125°C, which covers under-hood automotive and industrial cabinet ambient without derating. The synchronous rectifier is external (the LT3973 uses a freewheeling diode), so the layout needs a Schottky diode close to the SW pin with short, wide traces. The RT pin programs the switching frequency; a 0.1% resistor keeps the frequency tolerance tight enough for EMI filter design. ## Active production, tape-and-reel supply The TRPBF suffix indicates tape-and-reel packaging — 2,500 pieces per reel — which is the standard volume format for pick-and-place assembly. Cut-tape quantities are also available for prototyping.","metaTitle":"LT3973IMSE#TRPBF Buck Regulator, 750 mA, 42 V Input","metaDescription":"Analog Devices LT3973IMSE#TRPBF step-down buck regulator, adjustable output, 750 mA, 4.2-42 V input, -40 to 125°C, 10-MSOP-EP. Active, RoHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Step-Down","Topology":"Buck","Output Type":"Adjustable","Mounting Type":"Surface Mount","Package / Case":"10-TFSOP, 10-MSOP (0.118\\\", 3.00mm Width) Exposed Pad","lifecycle_stage":"eol_hot","Current - Output":"750mA","Number of Outputs":"1","Output Configuration":"Positive","Frequency - Switching":"195kHz ~ 2.15MHz","Operating Temperature":"-40°C ~ 125°C (TJ)","Synchronous Rectifier":"No","Voltage - Input (Max)":"42V","Voltage - Input (Min)":"4.2V","Voltage - Output (Max)":"24V","Supplier Device Package":"10-MSOP-EP","Voltage - Output (Min/Fixed)":"1.21V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$9.06","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$9.06000","currency":"USD"},{"qty":10,"price":"$8.18700","currency":"USD"},{"qty":25,"price":"$7.80560","currency":"USD"},{"qty":100,"price":"$6.77770","currency":"USD"},{"qty":250,"price":"$6.47308","currency":"USD"},{"qty":500,"price":"$5.90194","currency":"USD"},{"qty":1000,"price":"$5.14040","currency":"USD"},{"qty":2500,"price":"$4.95001","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between LT3973IMSE#TRPBF and LT3973IMSE-3.3#PBF?","answer":"Both are the same buck regulator family with identical 750 mA current rating, 4.2-42 V input range, and 10-MSOP-EP package. The fixed-output version saves one feedback resistor and is preferred when 3.3 V is the only rail needed. The adjustable version gives flexibility for non-standard voltages up to 24 V."},{"question":"Can I buy LT3973IMSE#TRPBF in cut-tape quantities?","answer":"The part is available in both Tape & Reel (TR) and Cut Tape (CT) packaging. Cut tape is suitable for prototype runs and small-batch assembly. For production volumes, the full reel (2,500 pieces) is the standard format."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT3973IMSETRPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LT3973IMSETRPBF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}