{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BQ27621YZFR-G1A","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"BQ27621YZFR-G1A","canonicalUrl":"https://icboms.com/texas-instruments/BQ27621YZFR-G1A","factsUrl":"https://icboms.com/api/mcp/products/BQ27621YZFR-G1A","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments BQ27621YZFR-G1A, Impedance Track™ series, single-cell Li-ion battery fuel gauge, I²C interface, 9-DSBGA package, -40°C to 85°C operating temperature.","salesMarkdown":"## Single-cell Li-ion fuel gauge with Impedance Track™ learning The BQ27621YZFR-G1A is a battery fuel gauge from Texas Instruments' Impedance Track™ series, designed for single-cell Lithium Ion packs. It communicates over an I²C interface, reporting state-of-charge based on a patented algorithm that learns the battery's impedance over time — meaning the accuracy improves after the first few charge-discharge cycles, unlike a simple voltage-table gauge that drifts as the cell ages. If your system sees sustained temperatures above 85°C at the battery pack, this part won't work — the gauge itself is the limit, not the cell. Housed in a 9-ball DSBGA (9-UFBGA) package, the BQ27621YZFR-G1A has a 0.5 mm ball pitch. That's a fine-pitch BGA — the PCB needs a solder-mask-defined pad with a via-in-pad or microvia fan-out under the balls. Hand soldering is impractical; rework requires a hot-air station with a nozzle small enough to avoid disturbing neighbouring components. The part is ROHS3 compliant. No special handling for lead-free solder — standard SAC305 reflow profile works. ## Sourcing and quoting","metaTitle":"BQ27621YZFR-G1A Battery Fuel Gauge – TI Impedance Track™","metaDescription":"Texas Instruments BQ27621YZFR-G1A single-cell Li-ion battery fuel gauge with Impedance Track™ algorithm. I²C interface, -40°C to 85°C, 9-DSBGA.","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":"BQ27621YZFR-G1","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"9-DSBGA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.4500","priceTiers":[{"qty":1,"price":"$2.45000","currency":"USD"},{"qty":10,"price":"$2.20500","currency":"USD"},{"qty":25,"price":"$2.08040","currency":"USD"},{"qty":100,"price":"$1.77240","currency":"USD"},{"qty":250,"price":"$1.66420","currency":"USD"},{"qty":500,"price":"$1.45618","currency":"USD"},{"qty":1000,"price":"$1.20654","currency":"USD"},{"qty":3000,"price":"$1.17750","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/8db14cee18d01fa0f78f13f9a62f29f1.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/BQ27621YZFR-G1A/alternatives.json"},"ai":{"faq":[{"question":"Is the BQ27621YZFR-G1A a replacement for the BQ27621?","answer":"The base product number is BQ27621, so the BQ27621YZFR-G1A is a specific package and tape/reel variant of the BQ27621 family. If you have a BQ27621 without the suffix, confirm the package and temperature range match your BOM — the YZFR suffix indicates the 9-DSBGA package and -40°C to 85°C rating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/BQ27621YZFR-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/BQ27621YZFR-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}}