{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ27621YZFT-G1A","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ27621YZFT-G1A","canonicalUrl":"https://icboms.com/texas-instruments/BQ27621YZFT-G1A","factsUrl":"https://icboms.com/api/mcp/products/BQ27621YZFT-G1A","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Impedance Track™ series BQ27621YZFT-G1A, Battery Monitor, I²C interface, 1-cell Lithium Ion, 9-UFBGA/DSBGA package, -40°C to 85°C operating temperature, Surface Mount.","salesMarkdown":"## Single-cell Li-Ion fuel gauge with Impedance Track™ It communicates over an I²C interface to a host MCU, making it a drop-in choice for portable devices, handheld instruments, and IoT endpoints that need accurate remaining-capacity data across the battery's life. ## What the I²C interface and single-cell rating mean for the BOM The I²C bus is the only host interface — no SMBus or HDQ variant here. That means the host firmware needs an I²C driver and the bus pull-up resistors must be sized for the DSBGA package's signal integrity at the board layout stage. The single-cell rating limits the part to packs with one series Li-Ion cell; a 2S or 4S pack requires a different gauge such as the BQ2084 family. Operating temperature from -40°C to 85°C covers cold-crank and hot-sun scenarios for handheld tools and outdoor data loggers, but the part does not carry AEC-Q100 qualification — if the application is under-hood automotive or a 125°C engine bay, the BQ79612PAPRQ1 is the functional-safety-graded sibling to look at.","metaTitle":"BQ27621YZFT-G1A Texas Instruments Battery Fuel Gauge, I²C","metaDescription":"Texas Instruments BQ27621YZFT-G1A single-cell Li-Ion battery monitor with Impedance Track™ algorithm. I²C interface, 9-DSBGA package, -40°C to 85°C.","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":"BQ27621","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"9-DSBGA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.9500","priceTiers":[{"qty":1,"price":"$2.95000","currency":"USD"},{"qty":10,"price":"$2.64600","currency":"USD"},{"qty":25,"price":"$2.49640","currency":"USD"},{"qty":100,"price":"$2.12680","currency":"USD"},{"qty":250,"price":"$1.99704","currency":"USD"},{"qty":500,"price":"$1.74740","currency":"USD"},{"qty":1250,"price":"$1.44786","currency":"USD"},{"qty":2500,"price":"$1.41300","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/8db14cee18d01fa0f78f13f9a62f29f1.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BQ27621YZFT-G1A/alternatives.json"},"ai":{"faq":[{"question":"What is the BQ27621YZFT-G1A used for?","answer":"It is a single-cell Lithium Ion battery fuel gauge that uses the Impedance Track™ algorithm to report accurate state-of-charge over I²C. Typical applications include portable medical devices, handheld instruments, power tools, and IoT edge nodes where battery runtime visibility is critical."},{"question":"Can BQ27621YZFT-G1A be used as a replacement for BQ27421?","answer":"The BQ27621 and BQ27421 are both single-cell Li-Ion fuel gauges from TI, but the BQ27621 uses the Impedance Track™ algorithm while the BQ27421 uses a different gauge algorithm. Pin compatibility and register maps differ — a direct drop-in replacement is not guaranteed without firmware and hardware validation against the target BQ27421 variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ27621YZFT-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/BQ27621YZFT-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}}