Sumida Corporation has introduced two new pulse transformers, the CIUH7D46 and CIUH10D47, designed for use in advanced Battery Management Systems (BMS) across electric vehicles, industrial energy storage, and portable power applications. These components mark the beginning of a new series of low-profile, surface-mount transformers designed for environments that require compact design and high isolation.
Battery Management Systems are responsible for monitoring and balancing the operation of high-voltage lithium-ion battery packs. The CIUH10D Series supports these systems by providing galvanic isolation and electromagnetic interference (EMI) suppression. These features help maintain the integrity of serial communication lines in daisy-chained BMS architectures.
Each transformer is built in a 5 mm–high surface-mount package suitable for dense circuit designs. The devices offer a 3,800 V DC isolation rating for 60 seconds, meeting the requirements of high-voltage conditions. Both models are qualified under AEC-Q200 for automotive reliability. The CIUH10D47 includes dual primary and secondary windings, allowing multiple configuration options. Mechanical design considerations include coplanarity of ≤0.1 mm and a metal terminal structure intended to provide consistent board-level stability. The operating temperature range for the series is -40°C to +125°C.
In terms of electrical performance, the CIUH10D47 operates with a working voltage of up to 1,000 V, while the CIUH7D46 is rated for 600 V. The interwinding capacitance is as low as 1.46 pF, minimizing noise coupling. The design achieves a low DC resistance of 0.38 Ω, improving overall efficiency. Inductance values range between 45 µH and 593 µH across the two variants. Both models comply with RoHS environmental standards.
The CIUH7D46 has been validated for use with Analog Devices’ isoSPI transceivers ADBM56821 and ADBM56822, aligning with current BMS evaluation platforms. The transformer is also compatible with other isoSPI communication devices. Typical applications include automotive BMS for electric, hybrid, and plug-in hybrid vehicles, as well as industrial storage systems, uninterruptible power supplies, and portable or off-grid energy systems.
Both the CIUH7D46 and CIUH10D47 transformers are available through Sumida’s distribution network. Additional technical details, specifications, and reference materials are accessible through the company’s website or local sales representatives.
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