TDK extends the DC working voltage of its InsuGate SMT gate drive transformers to 1000 V

TDK Corporation (TSE:6762) has significantly extended its EPCOS InsuGate series of SMT gate drive transformers, introducing new variants rated for a DC working voltage of up to 1000 V (ordering code: B78541A25). These components meet the IEC 61558-1/2-16 standard 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 a 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 x 10.5 x 9.2 mm (L x W x H), the new 1 kV-rated components reduce 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 standard Eurocard PCB, proving its resilience in powertrain-mounted modules. With a partial discharge extinction voltage of ≥1.2 kV (Vpeak), reinforced insulation voltage capability of 300 V (AC), and high voltage test performance at 3 kV (AC) for 60 seconds, these new transformers offer a reliable solution for galvanic isolation in next-generation power electronics.

Main applications

• Switch-mode power supplies
• Gate driver circuits
• Isolated DC-DC converters
• Galvanically isolated single-channel IGBT/SiC driver ICs

Main features and benefits

• DC working voltage up to 1000 V
• Small SMT package 13.85 x 10.5 x 9.2 mm (L x W x H)
• Flat L vs. temperature curve
• Coupling capacity 4 pF (typ.)
• Partial discharge capability
• RoHS compatible
• Qualified to AEC-Q200 Rev. E
• Vibration resistant acc. to AQG 324 on standard Eurocard PCB
• Wide temperature range up to +150 °C