Bourns SM91572AL BMS Transformer

Introduction

The Bourns SM91572AL is an automotive-grade battery management system (BMS) signal transformer designed for reliable isolated communication in high-voltage battery packs. It combines transformer isolation with integrated common-mode chokes to help maintain clean, robust data links in electrically noisy environments.

Part Description

The SM91572AL is a single-channel BMS signal transformer intended for serial daisy-chain and IsoSPI communication architectures. It is AEC-Q200 compliant, making it suitable for demanding automotive operating conditions.

Integrated common-mode chokes provide added noise rejection, helping suppress interference that can affect communication between battery-monitoring devices. The transformer supports up to 3000 VAC Hi-Pot isolation and a 1000 VDC working voltage, making it appropriate for isolated links in high-voltage battery systems.

Key characteristics include:

• Automotive-grade, AEC-Q200-compliant construction
• Single-channel isolated communication transformer
• Designed for BMS serial daisy-chain communication
• Compatible with IsoSPI communication interfaces
• Integrated common-mode chokes for improved noise immunity
• Up to 3000 VAC Hi-Pot isolation
• 1000 VDC working voltage capability
• Suitable for high-voltage battery monitoring networks

Applications

Potential applications for the SM91572AL include:

• Electric vehicle battery management systems
• Hybrid electric vehicle battery packs
• High-voltage battery monitoring units
• Battery cell monitoring and balancing systems
• Isolated serial communication links
• IsoSPI-based battery-monitoring networks
• Energy storage system battery controllers
• Industrial high-voltage battery packs
• Distributed battery sensing modules
• Charger and battery diagnostic equipment

Industries

Possible industries include:

• Automotive
• Electric vehicles and e-mobility
• Commercial transportation
• Battery manufacturing
• Renewable energy storage
• Industrial automation
• Power electronics
• Charging infrastructure
• Rail transportation
• Marine electrification

Usage Ideas

1. EV Battery Cell Monitoring Chain

Use the SM91572AL between battery-monitoring ICs in a multi-cell electric vehicle battery pack. Its isolation and common-mode noise suppression can support dependable daisy-chain communication across high-voltage sections of the pack.

2. Modular Energy Storage Rack

Integrate the transformer into communication paths between battery modules in a stationary energy storage system. The device can help isolate module-level monitoring electronics while supporting robust serial data transfer.

3. Industrial Battery Diagnostic Tool

Design an isolated battery diagnostic interface for high-voltage industrial battery packs. The transformer can be used to create a noise-resistant communication channel between measurement electronics and the system controller.

Conclusion

The Bourns SM91572AL is a specialized BMS signal transformer for isolated, noise-resistant communication in automotive and high-voltage battery systems. With AEC-Q200 compliance, integrated common-mode chokes, 3000 VAC Hi-Pot isolation, and support for serial daisy-chain and IsoSPI communication, it is well suited to reliable battery-monitoring designs in electric mobility, energy storage, and industrial power applications.