{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT8300IS5#TRMPBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT8300IS5~4TRMPBF","canonicalUrl":"https://icboms.com/analog-devices/LT8300IS5~4TRMPBF","factsUrl":"https://icboms.com/api/mcp/products/LT8300IS5%23TRMPBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LT8300IS5#TRMPBF monolithic flyback switching regulator, step-up/step-down topology, 260 mA output, 6 V to 100 V input, TSOT-23-5 package, Tape & Reel.","salesMarkdown":"## Monolithic flyback with a 100 V input ceiling The LT8300IS5#TRMPBF is a monolithic flyback switching regulator from Analog Devices, packing the power switch, control logic, and compensation into a 5-pin TSOT-23-5 package. It handles input voltages from 6 V up to 100 V, which means it can run off rectified 48 V telecom rails or 72 V industrial buses without an external pre-regulator — a common headache in isolated bias supply designs. Rated for 260 mA output current, this part is sized for auxiliary rails: IGBT gate-drive supplies, isolated sensor transceivers, or the housekeeping rail in a motor drive. The 260 mA figure is the maximum switch current limit; the actual deliverable load depends on the transformer turns ratio and switching frequency, but it's a solid fit for the 100-200 mA range most isolated bias circuits need. This is a true flyback converter, not a simple buck-boost. The transformer serves as both the energy-storage inductor and the isolation barrier. The output can be configured as positive or negative, and the flyback action inherently provides galvanic isolation when you use a transformer with separate primary and secondary windings — no optocoupler needed for the feedback loop on many designs. The switching frequency is programmable from 7.5 kHz to 750 kHz via a single resistor. Running at the low end reduces switching losses and improves cross-regulation for multi-output windings; the high end shrinks the transformer core size. The trade-off is that at 750 kHz the internal switch losses and snubber dissipation climb, so the 260 mA limit may need derating above 85°C ambient. There is no synchronous rectifier on the secondary side — the output diode handles the current. A Schottky diode with a low Vf is recommended for the secondary rectifier to keep losses manageable. ## Package reality — TSOT-23-5 thermal limits The LT8300 comes in a 5-lead TSOT-23-5 package — about 2.9 mm × 2.8 mm with a 0.95 mm pin pitch. The exposed pad on the bottom is the GND slug and the primary heat path. A solid copper pour under the part, connected to the ground plane with at least four vias, is essential to keep the junction temperature below the 125°C absolute maximum at full load in a 70°C ambient. The package is offered in Tape & Reel (TR) for production reels and Cut Tape (CT) for prototype quantities. The TR suffix in the order code means it ships on a 7-inch reel, typically 2,500 pieces per reel for this TSOT package. It remains a current-design part suitable for new production builds. The RoHS3 compliance means no exempted lead in the solder finish, so it ships clean for EU markets without a RoHS waiver. The operating temperature range covers -40°C to 125°C junction temperature, which qualifies it for industrial environments — motor drives, power supplies, and telecom equipment where the ambient can hit 85°C with internal heating.","metaTitle":"LT8300IS5#TRMPBF Flyback Regulator, 260mA, TSOT-23-5","metaDescription":"Analog Devices LT8300IS5#TRMPBF monolithic flyback switching regulator, 6-100V input, 260mA output, TSOT-23-5 package. Active production, RoHS3. Quoted per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Step-Up/Step-Down","Topology":"Flyback","Mounting Type":"Surface Mount","Package / Case":"SOT-23-5 Thin, TSOT-23-5","lifecycle_stage":"eol_hot","Current - Output":"260mA","Number of Outputs":"1","Output Configuration":"Positive or Negative, Isolation Capable","Frequency - Switching":"7.5kHz ~ 750kHz","Operating Temperature":"-40°C ~ 125°C (TJ)","Synchronous Rectifier":"No","Voltage - Input (Max)":"100V","Voltage - Input (Min)":"6V","Supplier Device Package":"TSOT-23-5"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$10.09","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$10.09000","currency":"USD"},{"qty":10,"price":"$9.11600","currency":"USD"},{"qty":25,"price":"$8.69200","currency":"USD"},{"qty":100,"price":"$7.54720","currency":"USD"},{"qty":250,"price":"$7.20800","currency":"USD"},{"qty":500,"price":"$6.57200","currency":"USD"},{"qty":1000,"price":"$6.00000","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional alternative to the LT8300IS5#TRMPBF?","answer":"The LT3573EMSE#PBF is also a monolithic flyback regulator from Analog Devices, but it offers a higher 1.25 A output current and comes in an MSOP-10E package — a larger footprint. The LT8300 is the lower-current, smaller-package sibling for applications where 260 mA is sufficient and board space is tight."},{"question":"Can the LT8300IS5#TRMPBF produce an isolated output?","answer":"Yes, the output configuration supports isolation-capable operation. With a flyback transformer that has separate primary and secondary windings, the LT8300 can deliver a galvanically isolated output without an optocoupler in many designs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT8300IS5~4TRMPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LT8300IS5~4TRMPBF 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}}