The maximum power dissipation of the BLF404,115 is 100 W, but it can be derated to 50 W for high-reliability applications.
To optimize thermal performance, ensure good heat sinking, use a thermal interface material, and keep the device away from heat sources. A thermal resistance of 1.5 K/W or lower is recommended.
Use a 4-layer PCB with a solid ground plane, keep the RF signal traces short and away from the DC power traces, and use a common mode choke to reduce EMI.
To prevent oscillation, ensure the device is properly biased, use a stabilizing network, and add a series resistor to the gate of the transistor. Also, avoid using a high-gain transistor in the amplifier stage.
The maximum operating frequency of the BLF404,115 is 4 GHz, but it can be used up to 6 GHz with reduced performance.
BLF404,115 datasheet
by NXP Semiconductors
