The HMC326MS8G is a high efficiency GaAs InGaP Heterojunction Bipolar Transistor (HBT) MMIC driver amplifier which operates between 3.0 and 4.5 GHz. The amplifier is packaged in a low cost, surface mount 8 leaded package with an exposed base for improved RF and thermal performance. The amplifier provides 21 dB of gain and +26 dBm of saturated power from a +5.0V supply voltage. Power down capability is available to preserve current consumption when the amplifier is not in use. Internal circuit matching was optimized to provide greater than 40% PAE. This amplifier is ideal for usage as a driver amplifier for wireless local loop applications in the 3.3 - 3.6 GHz frequency range.