RF gain and noise figure at 2.4 GHz
The BFU768F,115: This NPN RF transistor delivers 13.1 dB gain at 2.4 GHz, making it suitable for the front-end LNA stage in a 2.4 GHz ISM-band receiver where the gain budget is tight. The 1.1 dB noise figure at 2.4 GHz sets the receiver noise floor — in a typical 2.4 GHz LNA design, the cascaded NF starts here, and every 0.1 dB above this figure eats into the link margin.
Bias envelope and power handling
Rated for a 2.8 V collector-emitter breakdown and 70 mA maximum collector current, the part operates in the small-signal regime — a common-emitter LNA biased at 10 mA, 2 V draws 20 mW, well inside the 220 mW max power dissipation. DC current gain of 155 minimum at 10 mA, 2 V gives a predictable bias point for the collector current — the base current is roughly 65 µA, which a simple resistor divider from a 2.8 V rail can supply without a precision current source.
Package and board integration
The 150°C junction temperature rating means the part can sit in a 85°C ambient with 65°C of headroom for self-heating — adequate for a 20 mW LNA dissipating through the SOT-343F paddle.
ROHS3 compliant — the part contains no restricted substances above the threshold, which clears it for EU-market equipment without an exemption declaration.