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Texas Instruments BQ27421YZFT-G1A — Power Management (PMIC / Gate Driver)

BQ27421YZFT-G1A Battery Monitor, Impedance Track™, 1S Li-ion

MPNBQ27421YZFT-G1A
Active

Texas Instruments Impedance Track™ Series BQ27421YZFT-G1A, Battery Monitor, I²C, 1-Cell Lithium Ion, -40°C~85°C, 9-UFBGA/DSBGA, Surface Mount.

$3.0800Ref. price · indicative, final on quote
Texas Instruments BQ27421YZFT-G1A datasheet (PDF)
Packaging9-UFBGA, DSBGA
RoHSROHS3 Compliant
SeriesImpedance Track™
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BQ27421YZFT-G1A specifications
ParameterValue
SeriesImpedance Track™
MountingSurface Mount
InterfaceI²C
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionBattery Monitor
Case9-UFBGA, DSBGA
Number of cells1
Battery chemistryLithium Ion

Product details

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.

Frequently asked questions

Is BQ27421 compatible with 2S battery packs?

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.

What is the difference between BQ27421 and BQ27441?

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.