Isolated Surface-Mount DC-DC Converters for Gate Drive Circuits
Murata introduces the MGJ1T series of 6kVDC isolated DC-DC converters for high-voltage energy storage and motor drive systems.
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Murata Manufacturing has developed the MGJ1T series of 1W surface-mount DC-DC converters to power high-side and low-side gate drive circuits. The component series targets high-voltage applications such as energy storage systems and industrial motor drives, and is showcased at the PCIM 2026 exhibition in Nuremberg, Germany, from June 9 to 11.
Voltage Requirements and Isolation Performance
To support increasing system voltages in microgrids and electric vehicle charging infrastructure, the converters utilize block-coil transformer technology. The 1W devices support nominal input voltages of 12V, 15V, and 24V, providing regulated dual outputs of +15V/-3V, +15V/-5V, and +18V/-2.5V. The hardware is 100% tested to 6kVDC for one second and qualified to the same level for one minute. Recognized to the UL62368-1 standard, the units feature reinforced insulation with a continuous barrier withstand voltage of 2.2kVDC and an 800Vrms working voltage. The internal construction achieves 14mm of creepage and clearance.
Switching Stability and Noise Reduction
The series is characterized by a common-mode transient immunity (CMTI) exceeding 200kV/µs. Combined with a typical isolation capacitance of 2.5pF, this metric reduces high-frequency noise coupling across the isolation barrier, enabling stable switching operations in silicon carbide (SiC) circuit designs. Operating at a 700kHz switching frequency, the converters achieve up to 77% efficiency with a typical ripple and noise of 10mVp-p. The hardware maintains voltage regulation across varying load conditions and supports start-up into capacitive loads.
Environmental Testing and Assembly
The converters operate across an extended temperature range from -40°C to +115°C. The devices have undergone partial discharge evaluation to identify micro-level insulation defects, alongside JEDEC-standard environmental testing encompassing humidity, vibration, shock, and 1,000 thermal cycles between -40°C and +125°C. Manufactured in the United Kingdom, the MGJ1T series is packaged in a surface-mount, tape-and-reel format that is compatible with automated Pb-free reflow assembly processes.
Additional Context: This section details technical specifications and competitive benchmarking not included in the original product announcement
In the power electronics sector, 1W DC-DC converters designed for SiC and IGBT gate drives compete primarily on isolation voltage, coupling capacitance, and common-mode transient immunity (CMTI). Comparable products, such as the Mornsun QA series or RECOM Power's R-REF and RKZ series, provide similar dual asymmetric outputs required to securely bias SiC MOSFETs. A CMTI rating exceeding 200kV/µs is considered a high-tier benchmark, necessary to prevent false triggering caused by the extremely fast high-voltage switching transients characteristic of SiC components. Furthermore, maintaining an isolation capacitance around 2.5pF is critical for minimizing electromagnetic interference (EMI) and leakage currents across the isolation barrier.
Edited by Lekshman Ramdas, Induportals editor – adapted by AI.
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