{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ25121YFPR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ25121YFPR","canonicalUrl":"https://icboms.com/texas-instruments/BQ25121YFPR","factsUrl":"https://icboms.com/api/mcp/products/BQ25121YFPR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments BQ25121YFPR, single-cell Li-Ion linear charger, 300 mA max charge current, I²C interface, 25-XFBGA DSBGA package, -40°C to 125°C junction temperature.","salesMarkdown":"## Linear charger for small Li-Ion packs The Texas Instruments BQ25121YFPR is a single-cell linear Li-Ion charger delivering up to 300 mA charge current, with the charge current set via an I²C interface for on-the-fly adjustment. ## Charge current and I²C programmability The 300 mA maximum charge current targets small-capacity Li-Ion cells typical in wearables, hearing aids, and IoT end-nodes. The constant-current, constant-voltage profile is standard for Li-Ion, but the I²C interface allows the system MCU to adjust the charge current dynamically — useful for thermal management or charging from a current-limited source. Over-voltage fault protection is built in; no external blocking diode is needed if the input voltage stays below the 5.5 V supply max. ## NRND — plan for a replacement That means TI is not actively promoting it for new projects, though it remains available for existing production. For a new BOM, look at the current-generation BQ2512x family — the BQ25120A or BQ25125 are the natural successors with similar feature sets and pin compatibility. ## Package and field handling The 25-DSBGA package is a 0.4 mm pitch wafer-level chip-scale package. No lab, no bench — but you do need a hot-air station or reflow oven with a fine-tip stencil to place it. The solder balls are on the bottom; orientation is marked by a corner dot on the package top. ESD-sensitive, so keep it in the conductive foam or tape until reflow. The tape-and-reel delivery is standard for pick-and-place.","metaTitle":"BQ25121YFPR - TI Linear Li-Ion Charger, 300 mA, I²C","metaDescription":"Texas Instruments BQ25121YFPR single-cell Li-Ion linear charger, 300 mA max, I²C programmable current, 25-DSBGA package. NRND status.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR)","Interface":"I²C","Mounting Type":"Surface Mount","Package / Case":"25-XFBGA, DSBGA","Product Status":"Not For New Designs","Number of Cells":"1","lifecycle_stage":"eol_hot","Fault Protection":"Over Voltage","Battery Chemistry":"Lithium Ion","Current - Charging":"Constant - Programmable","Base Product Number":"BQ25121","Battery Pack Voltage":"4.2V","Charge Current - Max":"300mA","Operating Temperature":"-40°C~125°C(TJ)","Programmable Features":"Current","Voltage - Supply (Max)":"5.5V","Supplier Device Package":"25-DSBGA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.0240","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/6e493db6790ce0a56fd214cc06311190.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the BQ25121YFPR obsolete?","answer":"It is not fully discontinued, but TI advises against using it in new designs. For existing production, it can still be sourced through independent channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ25121YFPR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/BQ25121YFPR 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}}