Bourns Releases Industry’s First Automotive Grade Planar Signal BMS Transformer

Bourns Magnetics Product Line is pleased to introduce the Model SM91806AL AEC-Q200 compliant, automotive grade BMS (Battery Management System) planar signal transformer for next generation applications.

This single-channel basic insulation transformer has a planar structure and is designed for BMS applications.

The Bourns® Model SM91806AL BMS Planar Transformer was developed for use with Analog Device’s Model LTC6815 Series, NXP’s Model MC33771C Series and Texas Instruments’ Model BQ79616.

This BMS transformer offers a working voltage of up to 1000 VDC and Hi-Pot isolation voltage up to 4300 VDC or 3000 VAC with an extended operating temperature range of -40 to +125 °C. Additionally, Bourns’ automated manufacturing process has further improved the quality and cost-effectiveness of this transformer.


  • Planar technology for BMS signal applications
  • Working voltage: up to 1000 VDC
  • Hi-Pot: 4300 VDC or 3000 VAC
  • Basic insulation compliant with IEC 60664-1/61558-1/62368-1 standards
  • Clearance distance >8.2 mm, pollution degree 2,material group CTI I
  • Creepage distance >8.2 mm, Overvoltage Category II
  • Partial discharge level up to 1200 V per IEC 60664
  • Expanded temperature range: -40 to +125 °C
  • RoHS compliant and Halogen free
  • AEC-Q200 Compliant


  • Battery Management Systems (BMS)
  • Energy Storage Systems (ESS)
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