STMicroelectronics

STW34NB20

STW34NB20 Description

The STW34NB20 from STMicroelectronics is a 200V N-channel PowerMESH™ MOSFET designed for high-efficiency power switching applications. With a continuous drain current (Id) of 34A (at Tc=25°C) and a low on-resistance (Rds(on)) of 75mΩ at 10V gate drive, this device minimizes conduction losses, making it ideal for high-power designs. The MOSFET operates within a wide temperature range (up to 150°C junction temperature) and features a robust ±30V gate-source voltage (Vgs) tolerance, ensuring reliability in demanding environments. Although marked as obsolete, its performance characteristics remain competitive for legacy or specific industrial applications.

STW34NB20 Features

• High Voltage & Current Handling: 200V Vdss and 34A continuous drain current support high-power applications.
• Low Rds(on): 75mΩ @ 10V Vgs reduces power dissipation and improves efficiency.
• Fast Switching: Gate charge (Qg) of 80nC @ 10V and input capacitance (Ciss) of 3300pF @ 25V enable efficient high-frequency operation.
• Thermal Performance: 180W power dissipation (Tc) and TO-247-3 package enhance heat dissipation.
• Robust Construction: ROHS3 compliant, REACH unaffected, and MSL 1 (unlimited) for environmental and reliability compliance.
• Wide Vgs Range: ±30V maximum gate voltage provides design flexibility in gate drive circuits.

STW34NB20 Applications

• Switched-Mode Power Supplies (SMPS): High-efficiency DC-DC converters and PFC stages.
• Motor Drives & Inverters: Suitable for industrial motor control and servo systems.
• Renewable Energy Systems: Solar inverters and wind power converters benefit from its high-voltage capability.
• Automotive & Industrial Power Modules: Legacy designs requiring high-current switching with low losses.
• Uninterruptible Power Supplies (UPS): Ensures reliable energy transfer in backup systems.

Conclusion of STW34NB20

The STW34NB20 offers a balance of high voltage tolerance, low on-resistance, and robust thermal performance, making it a strong candidate for power electronics despite its obsolete status. Its PowerMESH™ technology ensures efficient switching, while the TO-247-3 package aids in heat management. While newer alternatives may exist, this MOSFET remains viable for industrial, automotive, and renewable energy applications where legacy compatibility or specific performance thresholds are required. Designers should evaluate replacement options but can leverage its proven reliability for existing systems.