SD4933

Overview

The SD4933 is an N-channel silicon RF power MOSFET transistor manufactured by STMicroelectronics. Designed for ISM applications up to 100 MHz, it operates with a 50 V supply and delivers a minimum output power of 300 W at 30 MHz with 24 dB gain. Key electrical parameters include a drain-source breakdown voltage of 200 V, continuous drain current of 40 A, and maximum power dissipation of 648 W. The device supports a gate-source voltage of +20 V and features a forward transconductance of at least 8 S. It is housed in an M177 surface-mount package and functions within a temperature range of -65°C to +150°C.

Feature Summary

• Improved ruggedness with high drain-source breakdown voltage capability
• Excellent thermal stability ensuring reliable operation under varying conditions
• Capable of handling 20:1 load mismatch across all phases without failure

Applications

• Industrial, Scientific, and Medical (ISM) equipment operating up to 100 MHz
• HF/VHF/UHF radio frequency power amplification
• RF transmitter stages requiring high power output and load tolerance

Procurement Notes

Verify the specific ordering suffix and packaging configuration directly with authorized distributors or the manufacturer before purchase. Confirm RoHS compliance status and environmental directives adherence for your region. Ensure that the M177 package dimensions match your PCB layout requirements. Check for any recent product change notifications that might affect pinout or electrical characteristics.

Selection Notes

Select this component when designing circuits for ISM bands up to 100 MHz requiring 300 W output power. Ensure the design accommodates the 200 V breakdown voltage margin and 648 W power dissipation capabilities. Verify that the thermal management system can handle the heat generated at full power. Consider the 40 A continuous current rating for biasing and load line calculations.

Part Context

The SD4933 belongs to STMicroelectronics' portfolio of RF power MOSFETs designed for robust performance in demanding environments. It is part of a series optimized for ISM applications, offering high power density and reliability. The device complements other RF transistors in the lineup by providing specific high-voltage and high-power characteristics suitable for industrial and medical frequency bands.

Replacement Considerations

The SD4933MR is a moisture-resistant variant of the same transistor family, sharing similar electrical characteristics but featuring enhanced packaging for extreme environments. Verify if the standard SD4933 meets your environmental needs or if the MR version is required for high-humidity applications.