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The paper presents a newly developed two-stage power amplifying MMIC capable of delivering 3 Watt a t X-band with high efficiency. This MMIC is designed for operation with external matching circuits on separate ceramic substrates. By customizing these circuits, the same MMIC can cover a n entire array of different applications.T h e versatility of this approach is demonstrated by the implementation of this MMIC in four power modules specified for different bandwidths, power levels and bias voltages. T h e small chip size and the tunability allowed by the external circuits lead to increased manufacturing yields a n d make possible significant cost reductions.Introduction.