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Bourns SM91522AL Automotive-Grade BMS Transformer

Bourns SM91522AL Automotive-Grade Battery Management System (BMS) Transformer is a single-channel BMS transformer that provides functional insulation and an integrated common-mode choke for noise rejection. The Bourns SM91522AL is rated for a 1000VDC working voltage and a 4300VDC Hi-Pot test. The 3.5mm low-profile design of the transformers suits compact BMS designs and thin battery packs.

Features

  • 3.5mm low-profile height
  • Pin auto-termination
  • 4300VDC Hi-Pot
  • 1000VDC working voltage
  • Single channel with integrated choke
  • Developed for use with
    • NXP Semiconductors MC33771/MC33772 Li-ion Battery Controllers
    • Texas Instruments BQ79616 Battery Monitors
  • AEC-Q200 and RoHS compliant
  • Functional insulation

Applications

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

Specifications

  • 150μH to 450μH inductance range
  • 0.5μH maximum leakage inductance
  • DC resistance (DCR)
    • 0.45Ω maximum (1-3)
    • 0.85Ω maximum (4-6)
  • 1:1 ±2% turns ratio
  • Moisture Sensitivity Level (MSL) 1
  • -40°C to +125°C operating temperature range

Dimensions

Mechanical Drawing - Bourns SM91522AL Automotive-Grade BMS Transformer

Schematic

Schematic - Bourns SM91522AL Automotive-Grade BMS Transformer
Published: 2026-10-20 | Updated: 2026-10-27