MC33771BTA1AER2

Overview

The MC33771BTA1AER2 is a 14-channel Li-ion battery cell controller IC designed for automotive and industrial applications. It operates within a supply voltage range of 9.6 V to 61.6 V, with transient tolerance up to 75 V. The device integrates ADC conversions for differential cell voltages and currents, coulomb counting, and temperature measurements. It features embedded balancing transistors and supports standard SPI and transformer-isolated daisy chain communication via the MC33664. Compatible with MPC5xxx 32-bit MCU families, it provides advanced diagnostics and functional safety capabilities.

Feature Summary

• Integrates synchronized high-precision current measurement with an integrated current sensor and PGA for accuracy from milliamps to kiloamps.
• Includes onboard passive balancing MOSFETs with programmable timers and diagnostic functions to simplify application design.
• Supports isolated daisy chain communication using the MC33664 or standard SPI for robust data processing and control.
• Provides comprehensive fault verification including over-voltage, under-voltage, over-temperature, and over-current detection.

Applications

• Hybrid Electric Vehicles (HEV)
• Electric Vehicles (EV)
• Energy Storage Systems (ESS)
• Uninterruptible Power Supply (UPS) systems

Procurement Notes

Verify the specific suffix TA1AE against official NXP documentation to confirm package type and tape/reel specifications. Ensure compatibility with the intended microcontroller interface, particularly regarding the use of the MC33664 for isolated daisy chain communication. Confirm that the AEC-Q100 qualification meets the thermal and reliability requirements of the target automotive or industrial environment before finalizing procurement.

Selection Notes

Select this component when designing systems requiring up to 14 series-connected lithium-ion cells with high-voltage isolation needs. It is suitable for applications demanding ISO 26262 compliance up to ASIL D. Consider the MC33771C variant if support for more than 15 nodes in a daisy chain or ringback functionality is required. Ensure the system architecture can accommodate the necessary external components for transformer isolation if utilizing the daisy chain mode.

Part Context

The MC33771 belongs to NXP's SafeAssure battery management family, specifically engineered for high-voltage battery packs. It serves as a Cell Controller Unit (CCU) in complex Battery Management Systems. The B-series variant focuses on standard automotive reliability with AEC-Q100 certification. It complements the MC33664 isolator to enable scalable multi-node architectures for large battery arrays in electric mobility and stationary storage.

Replacement Considerations

The MC33771C is a compatible alternative offering enhanced daisy chain node capacity and ringback support. For lower channel counts, the MC33772 series may be considered. Verify pinout and software register compatibility before substituting, as feature sets differ between B and C variants.