MC33774ATP1AER2

Overview

The MC33774ATP1AER2 is an 18-channel Li-Ion battery cell controller IC certified to ISO 26262 ASIL D. It supports 4 to 18 series cells with a supply voltage range of 9 V to 90 V and operates on a 5 V power supply. The device features ±1 mV measurement error (pre-aging) and integrates passive cell balancing up to 21 mA output current. It utilizes isolated ETPL or SPI communication, supporting up to 62 nodes in a daisy-chain topology. Packaged in LQFP-64, it functions between -40°C and +125°C.

Feature Summary

• ISO 26262 ASIL D functional safety certification for high-reliability automotive applications
• Integrated passive cell balancing with configurable average current control
• Isolated ETPL or SPI interface enabling scalable multi-node daisy-chain architectures
• Configurable digital filtering for high-frequency voltage measurement signals

Applications

• High-voltage Battery Management System (BMS) Cell Monitoring Units (CMU)
• Electric vehicle traction battery packs requiring ASIL D compliance
• Industrial energy storage systems with centralized monitoring topologies

Procurement Notes

Verify the specific suffix 'R2' indicates reel packaging versus 'AE' tray packaging when sourcing. Confirm RoHS and halogen-free status via the manufacturer's Certificate of Analysis. Ensure compatibility with the intended isolation barrier if using the ETPL bus. Check for long-term availability plans to secure supply chain stability for production volumes.

Selection Notes

Select this component for designs requiring up to 18 series cells per node with strict ASIL D safety requirements. It is suitable for applications needing integrated passive balancing and isolated communication. Compare against MC33775 for fewer channels or MC33777 for switchable junction box architectures. Consider thermal management capabilities within the LQFP-64 package for high-current balancing scenarios.

Part Context

This part belongs to the NXP MC3377x family of battery monitors. It serves as a primary analog front-end for lithium-ion battery stacks. The device complements microcontrollers by handling precise voltage acquisition and cell balancing tasks. It is designed for integration into distributed BMS architectures common in modern electric mobility solutions.

Replacement Considerations

MC33774ATP1AE is the tray-packaged equivalent. MC33774ATA1AE is an older generation variant with End-of-Life status. MC33775 offers similar functionality with fewer channels.