{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ27421YZFT-G1A","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ27421YZFT-G1A","canonicalUrl":"https://icboms.com/texas-instruments/BQ27421YZFT-G1A","factsUrl":"https://icboms.com/api/mcp/products/BQ27421YZFT-G1A","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Impedance Track™ Series BQ27421YZFT-G1A, Battery Monitor, I²C, 1-Cell Lithium Ion, -40°C~85°C, 9-UFBGA/DSBGA, Surface Mount.","salesMarkdown":"## Single-cell Li-ion fuel gauge with Impedance Track™ The Impedance Track™ algorithm compensates for battery aging, temperature, and discharge rate without requiring a full learn cycle. For a procurement decision, this means the gauge maintains accuracy over the life of the pack, reducing the need for mid-life recalibration or a higher-cost gauge IC. The single-cell support (1 cell) restricts this part to 1S Li-ion configurations — not suitable for 2S or multi-cell stacks without an external balancer. ## I²C interface and package constraints Communication is over I²C. The 9-DSBGA package is surface mount only. No NRND or last-time-buy notice is on file for this base product number (BQ27421YZFT-G1). For new designs, this part carries no imminent obsolescence risk, but as with any single-sourced TI fuel gauge, qualifying a second source early is a hedge against allocation.","metaTitle":"BQ27421YZFT-G1A Battery Monitor, Impedance Track™, 1S Li-ion","metaDescription":"Texas Instruments BQ27421YZFT-G1A single-cell Li-ion fuel gauge with Impedance Track™ algorithm. I²C interface, -40°C to 85°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":"Impedance Track™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Series":"Impedance Track™","Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Battery Monitor","Interface":"I²C","Mounting Type":"Surface Mount","Package / Case":"9-UFBGA, DSBGA","Product Status":"Active","Number of Cells":"1","lifecycle_stage":"eol_hot","Fault Protection":"-","Battery Chemistry":"Lithium Ion","Base Product Number":"BQ27421YZFT-G1","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"9-DSBGA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.0800","priceTiers":[{"qty":1,"price":"$3.08000","currency":"USD"},{"qty":10,"price":"$2.77000","currency":"USD"},{"qty":25,"price":"$2.61280","currency":"USD"},{"qty":100,"price":"$2.22620","currency":"USD"},{"qty":250,"price":"$2.09032","currency":"USD"},{"qty":500,"price":"$1.82904","currency":"USD"},{"qty":1250,"price":"$1.51548","currency":"USD"},{"qty":2500,"price":"$1.47900","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/21a7be246ef4b65e44fc22133d69db26.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BQ27421YZFT-G1A/alternatives.json"},"ai":{"faq":[{"question":"Is BQ27421 compatible with 2S battery packs?","answer":"No. The BQ27421 is rated for a single cell (1 cell) only. For 2S or higher series stacks, look at a multi-cell gauge such as the BQ2084 series."},{"question":"What is the difference between BQ27421 and BQ27441?","answer":"The BQ27441 is a later-generation gauge with the same Impedance Track™ core but adds a higher voltage range and additional protection features. The BQ27421 remains a solid choice for cost-sensitive 1S designs where those extras are not needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ27421YZFT-G1A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/BQ27421YZFT-G1A 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}}