{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC1861J","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC1861J","canonicalUrl":"https://icboms.com/texas-instruments/UC1861J","factsUrl":"https://icboms.com/api/mcp/products/UC1861J","rawCanonicalId":null},"summary":{"shortDescription":"Unitrode/TI UC1861J, switching controller, Step-Up/Step-Up/Step-Down, Boost/Flyback/Forward Converter/Full-Bridge/Half-Bridge/Push-Pull topology, 2 outputs, 50% max duty cycle, 50kHz-500kHz, 22V supply, Through Hole, 16-CDIP (0.300\", 7.62mm), -55°C to 125°C, Bulk.","salesMarkdown":"## What the UC1861J is and where it fits The UC1861J is a current-mode PWM controller from Unitrode (now Texas Instruments) designed for isolated and non-isolated DC-DC converters. It supports boost, flyback, forward, half-bridge, full-bridge, and push-pull topologies — a flexible part for a single-ended or dual-ended power stage. Two outputs drive external transistors with a fixed 50% maximum duty cycle, and the 50 kHz to 500 kHz switching range suits traditional ferrite magnetics. The 16-pin ceramic DIP (CDIP) package and -55°C to 125°C operating temperature range target military, aerospace, and downhole applications where hermetic sealing and extended temperature are mandatory. ## Package and mounting — ceramic DIP matters The UC1861J comes in a 16-lead ceramic DIP (CDIP-16, 0.300\" body width, 7.62 mm pitch). Through-hole mounting is the only option — no surface-mount variant exists for this order code. The ceramic package provides a hermetic seal and better thermal cycling endurance than plastic DIP, which is why it shows up in avionics and satellite power supplies. ## Temperature grade and environment Rated for -55°C to 125°C ambient. The 22 V supply rail is the maximum Vcc. ## Sourcing and lifecycle It is RoHS non-compliant (leaded solder finish), so verify your BOM's RoHS exemption or accept the non-compliant status for military/hermetic programs where lead-bearing finish is often required.","metaTitle":"UC1861J PWM Controller, 50kHz-500kHz, -55°C to 125°C","metaDescription":"UC1861J switching controller from Unitrode/TI. Step-Up/Step-Down, boost/flyback/forward/half/full-bridge/push-pull topology.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Bulk","Function":"Step-Up, Step-Up/Step-Down","Topology":"Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Through Hole","Output Phases":"1","Package / Case":"16-CDIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Control Features":"Soft Start","Duty Cycle (Max)":"50%","Number of Outputs":"2","Output Configuration":"Positive","Frequency - Switching":"50kHz ~ 500kHz","Operating Temperature":"-55°C ~ 125°C (TA)","Synchronous Rectifier":"No","Supplier Device Package":"16-CDIP","Voltage - Supply (Vcc/Vdd)":"22V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$26.38","stockQuantity":0,"priceTiers":[{"qty":12,"price":"$26.38000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/8cd5f5e5036515a645b2f4790ee776c8.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is UC1861J's function?","answer":"It is a switching controller (PWM) supporting Step-Up and Step-Up/Step-Down conversion with boost, flyback, forward, half-bridge, full-bridge, and push-pull topologies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC1861J","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC1861J 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}}