{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LT1244CN8#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LT1244CN8~4PBF","canonicalUrl":"https://icboms.com/analog-devices/LT1244CN8~4PBF","factsUrl":"https://icboms.com/api/mcp/products/LT1244CN8%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LT1244CN8#PBF offline switching controller, buck topology, 48% duty cycle, up to 500 kHz, 8-DIP (0.300\", 7.62mm) through-hole package, tube.","salesMarkdown":"## Offline buck controller in an 8-pin DIP The LT1244CN8#PBF is an offline switching controller from Analog Devices built around a current-mode buck topology with an isolated output stage. It operates from a 10 V to 25 V supply (Vcc/Vdd) with a 16 V startup threshold and delivers a fixed 48% duty cycle at switching frequencies up to 500 kHz. ## What the key specs mean for your converter design The 48% fixed duty cycle sets the maximum on-time ratio for the external power switch — in a typical buck converter this limits the input-to-output voltage step-down ratio. For an offline flyback or forward converter the duty cycle clamp also defines the reset time for the transformer core, which directly affects the volt-second balance and core saturation margin. Switching at up to 500 kHz lets you shrink the magnetic components (transformer and output inductor) compared to a 100 kHz design, at the cost of higher switching losses in the external MOSFET. The controller does not integrate the power switch (Internal Switch(s): No), so the choice of external FET and its gate drive layout governs the practical upper frequency. The isolated output (Output Isolation: Isolated) means the feedback path crosses the isolation barrier — typically via an optocoupler or a transformer-coupled winding. This controller generates the PWM signal on the primary side; the secondary-side regulation loop must be closed through an isolated error amplifier. Frequency Control is listed as a control feature — this likely refers to an RT/CT pin or a similar oscillator-programming input that lets you set the switching frequency with an external resistor and capacitor, rather than a fixed internal oscillator. ## Active production and compliance The 8-DIP through-hole package (Supplier Device Package: 8-PDIP) is a legacy footprint that simplifies prototyping and rework but occupies more board area than a surface-mount alternative. The tube packaging (Package: Tube) indicates it ships in anti-static tubes, not tape-and-reel — relevant for pick-and-place if you plan automated assembly with tube feeders.","metaTitle":"LT1244CN8#PBF Analog Devices Offline Buck Controller, 8-DIP","metaDescription":"LT1244CN8#PBF Analog Devices offline switching controller, buck topology, up to 500 kHz, 8-DIP through-hole. Active production, ROHS3 compliant. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tube","Topology":"Buck","Duty Cycle":"48%","Mounting Type":"Through Hole","Package / Case":"8-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Output Isolation":"Isolated","Internal Switch(s)":"No","Voltage - Start Up":"16 V","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C ~ 100°C (TJ)","Supplier Device Package":"8-PDIP","Voltage - Supply (Vcc/Vdd)":"10V ~ 25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.58","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.58000","currency":"USD"},{"qty":10,"price":"$5.94800","currency":"USD"},{"qty":25,"price":"$5.67160","currency":"USD"},{"qty":100,"price":"$4.92450","currency":"USD"},{"qty":250,"price":"$4.70320","currency":"USD"},{"qty":500,"price":"$4.28824","currency":"USD"},{"qty":1000,"price":"$3.91500","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the switching topology of LT1244CN8#PBF?","answer":"The topology is buck, with an isolated output stage. It is a current-mode PWM controller designed for offline isolated converters, typically flyback or forward topologies, operating from a rectified AC or DC input."},{"question":"What package does LT1244CN8#PBF come in?","answer":"It is supplied in an 8-DIP (0.300\", 7.62mm) through-hole package, also referred to as 8-PDIP. The shipping format is a tube."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LT1244CN8~4PBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LT1244CN8~4PBF 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}}