{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT3798IMSE#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT3798IMSEPBF","canonicalUrl":"https://icboms.com/analog-devices/LT3798IMSEPBF","factsUrl":"https://icboms.com/api/mcp/products/LT3798IMSE%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LT3798IMSE#PBF offline flyback switching controller, isolated topology, no internal switch, 500Hz-150kHz switching frequency, 10V-38V supply, -40°C to 125°C, 16-MSOP-EP exposed pad, Tube.","salesMarkdown":"## Offline flyback controller for isolated supplies The LT3798IMSE#PBF is an isolated flyback switching controller from Analog Devices, designed for offline and DC-DC converters where galvanic isolation is required. It drives an external MOSFET (no internal switch) and operates from a 10V to 38V supply, covering the rectified output of universal AC mains and many industrial bus voltages. The switching frequency can be set anywhere from 500Hz to 150kHz, giving you flexibility to optimize transformer size and EMI filtering for the application. The -40°C to 125°C operating range means it handles under-hood automotive, outdoor telecom cabinets, and factory-floor enclosures without a temperature derating headache. Packaged in a 16-MSOP-EP with exposed pad, it needs a solid thermal via pattern under the pad to keep the junction cool at higher loads. ## What the switching frequency range means for your design The 500Hz to 150kHz range is unusually wide. At the low end, you can run a large transformer with low core loss for noise-sensitive audio or instrumentation supplies. At the high end, you shrink the magnetics for a compact board, but you'll need to watch the switching losses in the external MOSFET and the transformer's interwinding capacitance. The controller doesn't have a fixed frequency — you set it with a resistor, so you can tune it during development to dodge a noisy band or meet a specific EMI limit. No internal switch means the MOSFET choice is yours: pick one with low Rds(on) for efficiency or a fast body diode for hard-switching topologies. ## Isolated output — why it matters The LT3798 senses the output voltage from the primary-side flyback waveform, eliminating the need for an optocoupler or separate feedback winding.","metaTitle":"LT3798IMSE#PBF Flyback Controller, 500Hz-150kHz, Isolated","metaDescription":"LT3798IMSE#PBF isolated flyback controller from Analog Devices. Switching frequency 500Hz-150kHz, Vcc 10V-38V, -40°C to 125°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tube","Topology":"Flyback","Mounting Type":"Surface Mount","Package / Case":"16-TFSOP (0.118\\\", 3.00mm Width) Exposed Pad","lifecycle_stage":"eol_hot","Output Isolation":"Isolated","Internal Switch(s)":"No","Frequency - Switching":"500Hz ~ 150KHz","Operating Temperature":"-40°C ~ 125°C","Supplier Device Package":"16-MSOP-EP","Voltage - Supply (Vcc/Vdd)":"10V ~ 38V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.87","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$7.87000","currency":"USD"},{"qty":10,"price":"$7.11000","currency":"USD"},{"qty":25,"price":"$6.77960","currency":"USD"},{"qty":100,"price":"$5.88680","currency":"USD"},{"qty":250,"price":"$5.62224","currency":"USD"},{"qty":500,"price":"$5.12616","currency":"USD"},{"qty":1000,"price":"$4.68000","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/3798fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does LT3798 have internal switches?","answer":"No, the LT3798 does not have internal switches — it drives an external MOSFET, giving you flexibility to choose the right FET for your power level and efficiency target."},{"question":"What is the equivalent of LT3798IMSE#PBF?","answer":"The LT3798EMSE#PBF and LT3798HMSE#PBF are functionally identical siblings — same flyback topology, same frequency range, same supply voltage — differing only in temperature grade or test flow. For Tape & Reel, use LT3798IMSE#TRPBF."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT3798IMSEPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LT3798IMSEPBF 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}}