{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC3803MPS6-5#TRMPBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC3803MPS6-5TRMPBF","canonicalUrl":"https://icboms.com/analog-devices/LTC3803MPS6-5TRMPBF","factsUrl":"https://icboms.com/api/mcp/products/LTC3803MPS6-5%23TRMPBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC3803MPS6-5#TRMPBF current-mode PWM flyback controller, 200kHz switching, 4V to 8.1V supply, 80% max duty cycle, -55°C to 150°C junction, TSOT-23-6 package, ROHS3.","salesMarkdown":"## What this flyback controller is and where it fits The LTC3803MPS6-5#TRMPBF is a current-mode PWM flyback controller from Analog Devices designed for isolated or non-isolated step-up/step-down DC-DC converters. It drives an external transistor switch at a fixed 200 kHz switching frequency, with a supply range of 4V to 8.1V on the Vcc pin. The part is rated for a junction temperature range of -55°C to 150°C, making it suitable for avionics, downhole instrumentation, and other high-temperature environments where standard industrial-grade controllers would derate. The 80% maximum duty cycle limits the achievable step-up ratio but keeps transformer reset simple in single-ended flyback topologies. ## Key ratings for your BOM decision The -55°C to 150°C junction temperature range is the standout spec here — this is a military-temperature-grade controller, not a commercial or even industrial part. If your design sees engine-bay heat, steam-sterilization cycles, or satellite thermal cycling, this controller holds its regulation where an LTC3803 in the I-grade (-40°C to 125°C) would drift or shut down. The 200 kHz fixed switching frequency is a design anchor: transformer core selection, snubber design, and EMI filter components all revolve around that single frequency, which simplifies the magnetics design compared to a variable-frequency controller. The 4V to 8.1V Vcc range means the controller itself can be biased from a low-voltage auxiliary winding or a small linear regulator — common in isolated supplies where the primary-side bias comes from a bootstrap winding. The 80% maximum duty cycle is worth noting: it sets the maximum voltage conversion ratio for a given transformer turns ratio. For a typical flyback with a 1:1 turns ratio, 80% duty gives a theoretical maximum output of about 4x the input (in continuous conduction mode), but practical designs usually stay below 70% to allow for load transients and component tolerances. The control features include current limit and enable, which are standard but essential for fault protection and sequencing. ## Package and footprint The TSOT-23-6 package (2.9 mm × 2.8 mm body) is a compact surface-mount footprint that suits dense PCB layouts. The thin profile (1.1 mm max height) helps in low-profile enclosures. The supplier device package is TSOT-23-6, matching the package/case description. ## Lifecycle and sourcing reality No end-of-life notification or last-time-buy window has been issued. For production planning, there is no imminent obsolescence risk, though the MPS6-5 suffix indicates the military-temperature grade, which may have longer lead times than the commercial-grade variants due to tighter test screening.","metaTitle":"LTC3803MPS6-5#TRMPBF Flyback Controller, -55°C to 150°C","metaDescription":"LTC3803MPS6-5#TRMPBF current-mode flyback controller from Analog Devices. 200kHz switching, 4V-8.1V supply, -55°C to 150°C junction temp. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Step-Up/Step-Down","Topology":"Flyback","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Surface Mount","Output Phases":"1","Package / Case":"SOT-23-6 Thin, TSOT-23-6","lifecycle_stage":"eol_hot","Control Features":"Current Limit, Enable","Duty Cycle (Max)":"80%","Number of Outputs":"1","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"200kHz","Operating Temperature":"-55°C ~ 150°C (TJ)","Synchronous Rectifier":"No","Supplier Device Package":"TSOT-23-6","Voltage - Supply (Vcc/Vdd)":"4V ~ 8.1V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$11.88","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$11.88000","currency":"USD"},{"qty":10,"price":"$10.73400","currency":"USD"},{"qty":25,"price":"$10.23480","currency":"USD"},{"qty":100,"price":"$8.88680","currency":"USD"},{"qty":250,"price":"$8.48744","currency":"USD"},{"qty":500,"price":"$7.73852","currency":"USD"},{"qty":1000,"price":"$7.06500","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/38035fc.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is LTC3803MPS6-5#TRMPBF suitable for isolated flyback designs?","answer":"Yes, the LTC3803MPS6-5#TRMPBF is specifically designed for flyback topologies and is isolation-capable. The output configuration is listed as 'Positive, Isolation Capable', meaning the controller drives a primary-side transistor while the feedback loop can be closed across the isolation barrier using an optocoupler or a transformer-coupled winding. The 200 kHz fixed frequency simplifies transformer design for isolated supplies."},{"question":"What is an equivalent or replacement for LTC3803MPS6-5#TRMPBF?","answer":"A functional peer with similar flyback capability is the LT3748EMS#TRPBF, which also drives an external transistor in flyback topology and supports isolated outputs. However, the LT3748 operates from -40°C to 125°C junction, not the full -55°C to 150°C range of the LTC3803MPS6-5. The LT3748 includes soft start and a different pinout (MSOP-16 vs TSOT-23-6), so a board redesign is required. The LTC3805EDD#PBF is another flyback controller but with a lower 70 kHz switching frequency and only -40°C to 85°C ambient rating, and it includes clock sync. Neither is a drop-in replacement; the LTC3803MPS"}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC3803MPS6-5TRMPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC3803MPS6-5TRMPBF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}