Back to Bourns

Bourns SM91581AL BMS Transformers

Bourns SM91581AL Battery Management System (BMS) Transformers integrate common-mode chokes to provide noise reduction and isolation in BMS communication circuits. These Bourns single-channel reinforced-insulation signal transformers are designed for BMS communication circuits with Hi-Pot isolation voltages up to 8400VDC (UL recognized). The AEC-Q200-compliant SM91581AL operates over a -40°C to +125°C temperature range and is ideal for use inside 2500V energy storage systems and electric vehicles (EV).

Features

  • 8400VDC Hi-Pot
  • Basic insulation
    • Per reinforced insulation IEC 62477-1:2022 and IEC 62477-2:2018
    • Up to 2500VDC working voltage
  • Reinforced insulation
    • Per reinforced insulation IEC 62477-1:2022 and IEC 62477-2:2018
    • Up to 1800VDC working voltage
  • >23.7mm creepage distance, pollution degree 2, material group CTI I
  • >23.7mm clearance distance, Overvoltage Category II, up to 5000m above sea level
  • AEC-Q200 and RoHS compliant

Applications

  • BMS in hybrid and electric powertrain systems
  • Energy storage battery packs with BMS

Specifications

  • 150μH to 450μH inductance range
  • 0.6μH maximum leakage inductance
  • 1:1 turns ratio
  • -40°C to +125°C operating temperature range
  • DC resistance (DCR)
    • 0.5Ω maximum (1-3)
    • 0.6Ω maximum (4-6)

Schematic

Schematic - Bourns SM91581AL BMS Transformers

Dimensions

Mechanical Drawing - Bourns SM91581AL BMS Transformers
Published: 2026-09-11 | Updated: 2026-09-11