The SZA-5044 is a high efficiency 4.9GHz to 5.9GHz class AB Heterojunction Bipolar Transistor (HBT) power amplifier housed in a low-cost surface mountable plastic package. This HBT amplifier is made with InGaP on GaAs device technology and is fabricated with MOCVD for an ideal combination of low cost and high reliability. This device is specifically designed as a final or driver stage for 802.11a equipment in the 4.9GHz to 5.9GHz band, operating from a 5V supply. Optimized on-chip impedance matching circuitry provides a 50Ω nominal RF input impedance. A single external output matching circuit covers the entire 4.9GHz to 5.9GHz band simultaneously. The external RF output match and bias adjustability allows load line optimization for other applications or optimized performance over other bands. It features an output power detector, on/off power control, and high RF overdrive robustness.