Elec&Eltek Battery Management System

17 12 2025

Product image BMS transformer for automotive battery packs: 4300V isolation, EMI, isoSPI/SPI, compact, AEC-Q200. Ideal for industrial electronics.

Automotive battery packs use daisy chain connections, for the extremely high number of cells used in each pack. Potential voltages differences require high component isolation strength. The serial communication from board-to-board requires an isolation transformer.

E&E Magnetics provide all the magnetics needed for Isolation, Communication and filtering including BMS transformers covered here.

BMS Transformer Module

Provide hi-pot isolation up to 4300V
Provide EMI suppression
Support serial daisy chain isoSPI, SPI
Operating temp.: -40°C to +125°C/+150 °C
Compact size with 7.62 x 9.27 x 5.72mm
AEC-Q200 for automotive application

Part no.	Working Voltage	HI-POT Isolation	Creepage Distance	CMC	Operating Temp Range	Package Size (L x W x H)	IC Design Ref
A21V00037F	1000Vdc	4300Vdc	>5mm	Yes	-40° C ~ +125° C	7.62 x 9.40 x 5.72 mm	ADI (LTC6820, LTC6804, LTC6811), NXP/FREESCALE (MC33664, MC33771, MC33772)
A21V00038F	1000Vdc	4300Vdc	>5mm	Yes	-40° C ~ +125° C	7.62 x 9.27 x 5.72 mm	ADI (LTC6820, LTC6804, LTC6811), NXP/FREESCALE (MC33664, MC33771, MC33772)
A21V00039F	1000Vdc	4300Vdc	>5mm	Yes	-40° C ~ +150° C	8.38 x 10.50 x 4.25 mm	TEXAS INST BQ79606
A21V00040F	1000Vdc	4300Vdc	>10mm	Yes	-40° C ~ +125° C	9.00 x 15.43 x 3.45 mm	ADI (LTC6820, LTC6804, LTC6811, LTC6813), NXP/FREESCALE (MC33664, MC33771, MC33772, MC33773)

Elec&Eltek Battery Management System

BMS Transformer Module

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