Texas Instruments BQ771806DPJR

Overview

BQ771806DPJR from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.350 V fixed overvoltage threshold, 3 s internal delay timer, and CMOS active-high output drive. It operates across –40°C to 110°C and supports handheld power tools and e-bike battery management systems.

For engineers reviewing the BQ771806DPJR datasheet, BQ771806DPJR pinout, BQ771806DPJR application, or BQ771806DPJR equivalent, this page delivers verified technical context, package mapping, functional timing behavior, real-world use cases, and validated alternative options - all grounded in TI's official SLUSAX1L documentation and orderable part data.

Technical Context

The BQ771806DPJR independently monitors up to five cell voltages (V1–V5) against a precision 4.350 V overvoltage threshold with ±10 mV accuracy at 25°C and <±54 mV drift across –40°C to 110°C. Its internal delay timer triggers the CMOS active-high OUT signal after exactly 3 s upon any cell exceeding VOV.

It operates from 3 V to 25 V supply (VDD–VSS), draws only ≈1 µA quiescent current when all cells are below VOV, and maintains per-cell input leakage <100 nA. The device supports Customer Test Mode (CTM) with 15 ms fault detection for production-line validation.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, wettable flank, RoHS-compliant, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage protection applications.

Compared with BQ771806DPJR, BQ771800DPJR offers a 50 mV lower OVP threshold for conservative protection, while BQ771807DPJR provides +100 mV headroom for high-voltage cells - both retain identical timing, output drive, and package, enabling direct layout reuse where voltage thresholds align with cell specifications.

Availability

BQ771806DPJR is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, and cordless vacuum cleaner designs requiring stable component supply, functional safety documentation, and long-lifecycle industrial availability.

Supply support for BQ771806DPJR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and power management solutions with deep expertise in battery management and functional safety.

The BQ7718 family is designed specifically for standalone, high-accuracy overvoltage protection in multi-cell Li-ion battery packs - prioritizing precision, low power, and robustness in portable and light electric vehicle applications.

FAQ

What is the overvoltage protection threshold of the BQ771806DPJR?

The BQ771806DPJR has a fixed overvoltage protection (OVP) threshold of 4.350 V with ±10 mV accuracy at 25°C. This value is factory-trimmed and remains stable across temperature, with worst-case drift of ±54 mV from –40°C to 110°C. The BQ771806DPJR uses this precise threshold to detect overvoltage on any monitored cell in 2–5S Li-ion configurations.

Does the BQ771806DPJR require external timing components?

No, the BQ771806DPJR integrates a fixed 3 s internal delay timer - no external capacitors or resistors are needed to set the overvoltage response time. This simplifies design, improves reliability, and eliminates component variation effects. The BQ771806DPJR also supports Customer Test Mode (CTM) with a reduced 15 ms delay for production-line verification.

What package type does the BQ771806DPJR use?

The BQ771806DPJR uses an 8-pin WSON (DPJ) package measuring 3.00 mm × 4.00 mm with wettable flanks. It is RoHS-compliant, rated MSL Level-1, and compatible with standard reflow profiles. This compact, thermally efficient package supports high-density battery pack layouts and automated optical inspection.

How does the BQ771806DPJR handle cell voltage sensing?

The BQ771806DPJR provides five independent high-impedance sense inputs (V1–V5) referenced to VSS, enabling direct connection across each series-connected Li-ion cell. Each input exhibits <100 nA leakage, minimizing impact on cell balance and self-discharge. External RC filters (RIN/CIN) are required per input for noise suppression, with RIN = 1 kΩ recommended for calibrated accuracy.

Is the BQ771806DPJR suitable for functional safety applications?

Yes, the BQ771806DPJR is functional safety-capable: TI provides documentation supporting ISO 26262 ASIL-B and IEC 61508 SIL-2 system-level safety analysis. While the BQ771806DPJR itself is not certified, its architecture, failure modes, and diagnostic coverage data aid safety architects in qualifying battery protection subsystems for e-mobility and industrial equipment.