B78541A InsuGate Series SMT Transformers

TDK Corporation has significantly extended its EPCOS InsuGate series of SMT gate drive transformers, introducing variants rated for a DC working voltage of up to 1000 V (B78541A25). These components meet the IEC 61558-1 and 61558-2-16 standards for basic insulation and enable more compact gate driver designs for full-bridge inverter modules, particularly in demanding e-mobility and industrial environments. The triple-insulated winding structure, combined with an MnZn ferrite core and optimized coil architecture, allows for robust isolation in high switching frequency applications without compromising board space or reliability.

With a footprint of just 13.85 mm x 10.5 mm x 9.2 mm (L x W x H), the latest InsuGate series of 1 kV-rated components reduces PCB floor space requirements by approximately 30% compared to traditional single gate drive transformer designs supporting equivalent insulation. They offer a flat inductance profile up to +150°C, with a nominal inductance of 75 µH and a coupling capacitance of only 4 pF, making them a good choice for fast-switching IGBT and SiC devices. SPICE models are available upon request.

The series is qualified to AEC-Q200 Rev. E and has undergone extended mechanical vibration testing in line with AQG 324 requirements based on the standard Eurocard PCB, proving its resilience in powertrain-mounted modules. With a partial discharge extinction voltage of ≥1.2 kV_peak, reinforced insulation voltage capability of 300 V_AC, and high voltage test performance at 3 kV_AC for 60 seconds, these latest transformers offer a reliable solution for galvanic isolation in next-generation power electronics.