How to add BFP 420 transistor in the ADS Library to simulate.

search the transistor over nxp or freescale or anyother vendor .. you will find "design Kit" for your component on their website.. download it and just install it !

thanks for reply sir,

I have downloaded the BFP 420 from Infineon manufacturer, and installed the component.But i didn't find the component in the library .please help me what to do next.

I doubt you have installed it incorectly!
Follow this, if still issue let us know!
http://newport.eecs.uci.edu/eceware/...s/pdf/dkug.pdf