Device Overview
BQ20Z45DBTR-R1 is a legacy SBS 1.1-compatible gas-gauge and battery-protection IC using TI Impedance Track technology for 2-series to 4-series Li-ion or Li-polymer packs. It combines charge gauging, programmable voltage/current/temperature protections, an 8-bit RISC core and SHA-1 authentication in a 38-pin DBT TSSOP. The manufacturer datasheet for this exact family is marked Not Recommended For New Designs, so lifecycle status is an explicit procurement constraint.
Confirmed Technical and Ordering Data
| Parameter | Confirmed value | Scope / condition |
|---|---|---|
| Device Function | SBS gas gauge and battery protection IC | Impedance Track technology |
| Cell Count | 2 to 4 series cells | Li-ion / Li-polymer |
| Gauging Accuracy | better than 1 % | feature claim; over battery lifetime under documented gauging method |
| Host Interface | Smart Battery Specification SBS v1.1 | serial communication |
| Cpu | 8-bit RISC | ultralow-power modes |
| Protection | Voltage, current and temperature protections | programmable |
| Authentication | SHA-1 | supported |
| Lifecycle Note | Not Recommended For New Designs | datasheet marking; legacy TI support remains |
| Package | TSSOP-38 (DBT) | 2000-piece TAPE & REEL |
| Temperature Range | -40 to 85 °C | exact orderable/package option |
Engineering Selection Guidance
The 2-to-4-series-cell limit is a hard pack-topology constraint, while Impedance Track gauging and SBS 1.1 define the battery-estimation and host-communication behavior. The better-than-1% gauging statement is a manufacturer feature claim tied to the documented gauging method, not an unconditional system-level accuracy guarantee. Programmable voltage, current and temperature protection functions still require pack-specific thresholds. Most importantly, the NRND lifecycle marking matters for a new BOM: use this exact part only when legacy compatibility or an established design justifies it and verify long-term supply before release.
Lifecycle and Procurement
Texas Instruments documentation marks BQ20Z45DBTR-R1 / the BQ20Z45-R1 family as Not Recommended For New Designs; the legacy support resources remain available, but this lifecycle state must be considered before a new design is released. This exact orderable uses the TSSOP-38 (DBT) package with TAPE & REEL packing and a package quantity of 2000. Lifecycle status does not indicate HKEQGOO stock, lead time, MOQ, or final availability.
