Gallium Nitride 28V, 5W, 20-1500 MHz Amplifier. The NPA1003 is a wideband, internally-matched, GaN power amplifier optimized for 20-1500 MHz operation. This device has been designed for CW, pulsed, and linear operation with output power levels exceeding 5W (37 dBm) in an industry standard, surface mount, QFN4X4-16 plastic package.