MRF148A

Overview

The MRF148A is a linear RF power FET designed for industrial, commercial, and amateur radio equipment up to 175 MHz. It operates at 50 V with a drain-source breakdown voltage of 120 Vdc and continuous drain current of 6 Adc. At 30 MHz, it delivers 30 W output power with 18 dB gain and 40% efficiency. The device features low reverse transfer capacitance (3 pF) and superior high-order intermodulation distortion performance (-35 dB IMDd3). It is tested for load mismatch stability at all phase angles with 30:1 VSWR.

Feature Summary

• Superior high-order intermodulation distortion performance
• Specified characteristics at 50 V and 30 MHz
• Tested for load mismatch stability at all phase angles with 30:1 VSWR
• Lower reverse transfer capacitance

Applications

• Industrial radio equipment
• Commercial radio equipment
• Amateur radio equipment

Procurement Notes

Verify the specific datasheet revision (e.g., Rev. V2) against the manufacturer's official documentation before finalizing designs. Confirm that the package dimensions and thermal resistance values match the intended mechanical layout and cooling requirements. Ensure gate protection circuits are included as the device lacks an internal monolithic Zener diode. Validate that the operating conditions remain within the absolute maximum ratings provided in the latest technical specifications.

Selection Notes

Select this component for linear amplifier applications requiring high linearity and robust load mismatch tolerance. The device is suitable for frequencies up to 175 MHz where 30 W output power is required. Consider the thermal management needs due to the specified junction-to-case thermal resistance. Ensure the design accommodates the positive temperature coefficient of the on-resistance for stable operation at elevated temperatures.

Part Context

The MRF148A belongs to MACOM's lineup of linear RF power FETs. It is engineered specifically for power amplifier stages in communication systems. The silicon MOSFET technology provides high input impedance and low leakage current. It is distinct from switching MOSFETs by its optimization for linear operation and intermodulation distortion performance.

Replacement Considerations

No public confirmed substitute part numbers are available in the source material.

FAQ

What is the maximum gate-source voltage rating?

The absolute maximum gate-source voltage rating is ±40 Vdc.

Does the MRF148A have internal gate protection?

No, the device does not have an internal monolithic Zener diode from gate-to-source; external protection is recommended.

How is the device tested for load mismatch?

It is 100% tested for load mismatch at all phase angles with a 30:1 VSWR.