RFLN05C is a four stage low noise amplifier. It provide high gain over wide bandwidth,low Noise Figure, high isolation, stability. The LNA is designed to operate from 28 – 40 GHz using 0.1um GaAs pHEMT process. The designed LNA, bias current and gain can be set with the gate bias to allow the user to customize the current, gain and NF value to fit the application. The LNA offers, 17 +/- 3 dB.of small signal gain, OP1dB of 19.8 dBm with low noise figure along with the flexibility of setting current and gain makes this LNA an ideal front end amplifier in 5G, Terrestrial communication system and Radar Application. All results are shown in datasheet with considering of parasitic and coupling effects in layout.