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ST Launches New MDmesh MOSFETs

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650V and 600V N-channel super-junction multi-drain silicon MOSFETs raise power density and efficiency

STMicroelectronics' STPOWER MDmesh M9 and DM9 N-channel super-junction multi-drain silicon power MOSFETs are suitable for switched-mode power supplies (SMPS) in applications from data-centre servers and 5G infrastructure to flat-panel televisions.

The first devices to be launched are the 650V STP65N045M9 and the 600V STP60N043DM9. Both have very low on-resistance (RDS(on)) per unit area, which maximises power density and permits compact system dimensions. Each has the best maximum RDS(on) (RDS(on)max) in its category, at 45mΩ for the STP65N045M9 and 43mΩ for the STP60N043DM9. With very low gate charge (Qg), typically 80nC at 400V drain voltage, these devices have the best RDS(on)max x Qg figure of merit (FoM) currently available.

The gate threshold voltage (VGS(th)), typically 3.7V for the STP65N045M9 and 4.0V for STP60N043DM9, minimizes both turn-on and turn-off switching losses compared with the earlier MDmesh M5 and M6/DM6. The MDmesh M9 and DM9 series also feature a very low reverse recovery charge (Qrr) and reverse recovery time (trr), which further contribute to improved efficiency and switching performance.

A further feature of ST's latest high-voltage MDmesh technologies is an additional platinum diffusion process that ensures a fast intrinsic body diode. The peak diode-recovery slope (dv/dt) is greater than for earlier processes. All devices belonging to MDmesh DM9 technology are extremely rugged and can withstand dv/dt up to 120V/ns at 400V.

ST's new MDmesh M9 and DM9 devices, the STP65N045M9 and STP60N043DM9, both in a TO-220 power package, are already in production and they will be available at distributors by the end of Q2 2022. The STP65N045M9 will be priced from $6.30 for orders of 1000 pieces. Further standard surface-mount and through-hole packages options will be added later in 2022.

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