MRF555T

Overview

The MRF555T is an NPN silicon RF bipolar transistor designed for high current, low power, and low noise amplifier applications up to 1.0 GHz. It features a maximum collector-emitter voltage of 16V and a continuous collector current of 0.5A. The device delivers a typical noise figure of 2.5 dB at 500 MHz and offers a gain of approximately 11 dB. Packaged in a surface-mount POWER MACRO format, it supports efficient thermal management for compact RF circuit designs.

Feature Summary

• Optimized for low noise performance in high-frequency amplifier stages
• Capable of handling high current loads with low power consumption
• Utilizes a robust surface-mount package for reliable thermal dissipation

Applications

• Low noise amplifiers operating up to 1.0 GHz
• High current RF signal processing circuits
• Ultra-high frequency band communication systems

Procurement Notes

Verify the specific manufacturer source, as Microsemi Corporation has been acquired by Microchip Technology. Confirm whether the component is available as new stock or if it is listed as obsolete or end-of-life status. Ensure the package type matches the required PCB footprint and that the voltage ratings align with the target circuit design before finalizing procurement.

Selection Notes

Select this component when designing RF stages requiring minimal noise addition at frequencies near 500 MHz. Consider the 16V breakdown limit and 0.5A current capacity against the system's power requirements. Evaluate the thermal characteristics of the POWER MACRO package to ensure adequate heat sinking or board layout support for sustained operation.

Part Context

This part belongs to the MRF555 series of RF transistors, which are engineered for general-purpose high-frequency amplification. The 'T' suffix typically denotes a tape-and-reel packaging configuration suitable for automated surface-mount assembly processes, distinguishing it from other variants in the same functional family.

Replacement Considerations

Check for direct substitutes within the MRF555 series or equivalent NPN RF transistors with matching 16V ratings and similar noise figures. Verify pinout compatibility and package dimensions to ensure seamless integration into existing designs without modifying the PCB layout.