The THAT300 Series ICs are large-geometry monolithic NPN and/or PNP transistor arrays which combine low noise, high speed and excellent parametric matching between devices of the same gender. The large geometries typically result in 25 W base spreading resistance for the PNP devices (30 W for the NPNs), producing 0.75 nV Hz voltage noise (0.8 nV Hz for the NPNs). This makes the 300 Series an ideal choice for low-noise amplifier input stages.