{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3909QTR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"UC3909QTR","canonicalUrl":"https://icboms.com/texas-instruments/UC3909QTR","factsUrl":"https://icboms.com/api/mcp/products/UC3909QTR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments UC3909QTR battery charge controller, active lifecycle, RoHS non-compliant, Bulk package.","salesMarkdown":"## What this part is and where it fits The Texas Instruments UC3909QTR is a battery charge controller, designed to manage the charging profile for lead-acid or similar battery chemistries in a single IC. It handles the voltage and current regulation loop, charge termination, and status indication — essentially the brains of a smart charger. You will find this part in industrial power supplies, UPS systems, battery backup units, and any equipment where a sealed lead-acid battery needs a controlled charge cycle. ## Lifecycle and compliance — the sourcing reality The product status is Active. This part is RoHS non-compliant. ## What the ratings mean for your BOM As a charge controller, the UC3909QTR does not have a single headline rating like a voltage or current output — its value is in the control algorithm. It implements a multi-stage charge profile (bulk, absorption, float) and includes temperature compensation if you connect an external thermistor. That means the external pass transistor (typically a MOSFET or Darlington pair) and the current-sense resistor are what actually set the charge current and voltage; the UC3909QTR just drives the gate. For a BOM planner, that translates to: you need at least one power transistor, one sense resistor, and a few passive components to make it work. The controller itself draws minimal quiescent current, so the thermal design is about the pass element, not the IC. ## Package and handling The package is Bulk.","metaTitle":"UC3909QTR Battery Charge Controller, Active","metaDescription":"Texas Instruments UC3909QTR battery charge controller. Active lifecycle, RoHS non-compliant.","metaKeywords":null},"attributes":{"series":"*","packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Series":"*","Package":"Bulk","lifecycle_stage":"eol_hot"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.11","stockQuantity":0,"priceTiers":[{"qty":143,"price":"$2.11000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/814df59a7b74cb1699ff7f430a545675.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does UC3909QTR require any specific external components for typical application?","answer":"Yes, like most charge controllers, the UC3909QTR requires an external pass transistor (typically a MOSFET or Darlington), a current-sense resistor, and a few passive components to set the charge voltage and current. A thermistor can be added for temperature compensation. The IC itself handles the control logic and gate drive."},{"question":"Can I buy UC3909QTR in small quantities for prototyping?","answer":"Yes, the UC3909QTR ships in Bulk packaging, which means it is available in loose quantities suitable for prototyping or small-run assembly. Submit an RFQ for the quantity you need — small lots are typically accommodated."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/UC3909QTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/UC3909QTR 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}}