Six new 600V series N-channel power MOSFETs with innovative package design

Toshiba Electronics Europe GmbH has launched six new products featuring the DTMOSVI 600V series of N-channel power MOSFET chips, mounted in a 4-pin TO-247-4L(X) package. These advanced TKxxxZ60Z1 devices are designed to reduce switching loss significantly. They are suited to a range of demanding applications, including servers in data centres, SMPS for industrial equipment, and power conditioners for PV generators.

The series, featured in these new products, has been engineered with an optimised gate design and process. This optimisation has resulted in a decrease of the drain-source on-resistance (RDS(ON)) per unit area by approximately 13%. Furthermore, the crucial FOM for MOSFET performance, RDS(ON) × gate-drain charge (Qgd), has been lowered by approximately 52% compared to the company's previous generation DTMOSIV-H series products with the same 600V drain-source voltage (VDS) ratings. For example, the TK024Z60Z1 has a typical RDS(ON) of 20mΩ and Qgd of 37nC. This translates into a better trade-off between conduction loss and switching loss, directly contributing to the high efficiency of switched-mode power supplies.

The new products include a four-pin TO-247-4L(X) package, which consists of a dedicated signal source terminal for the gate drive. This design enhancement greatly reduces the impact of switching due to the inductance of the source wire inside the package, a common issue in conventional three-pin packages. In three-pin packages, the inductance of the source wire generates a counter-electromotive voltage, reducing the effective gate drive voltage and thereby slowing down the switching speed of the MOSFET. By contrast, the four-pin package connects the signal source terminal close to the FET chip, thereby mitigating this effect and enabling the voltage applied between the gate and source to be approximately equal to the gate drive voltage. This improvement enhances the switching speed and improves high-speed switching performance, thereby contributing to the high efficiency required in applications such as servers, UPS systems, and photovoltaic inverters. However, it is essential to note that the TO-247-4L(X) package has a distinct appearance and dimensions compared to the company's existing four-pin TO-247-4L package, as it incorporates a cavity between the drain and source pins to increase the creepage distance.

The company continues to support circuit designers by providing a range of tools, including the G0 SPICE model for quick verification of circuit function, and highly accurate G2 SPICE models that precisely reproduce transient characteristics.