Overview
The BFS540 is a RF Mixer made by Philips Semicons with 5 pins.
JLCPCB lists it (part C5953765).
Symbol
The library has no symbol for this part yet.
Footprint
The library has no footprint for this part yet.
Questions
Where is the BFS540 datasheet?
Philips Semicons publishes it: the Datasheet link on this page opens it.
Where can I order the BFS540?
JLCPCB lists it as part C5953765, with 0 in stock; the sellers' links on this page open their listings.