Infineon BFS481: High-Performance Silicon NPN RF Transistor for UHF Applications
The Infineon BFS481 stands as a premier silicon NPN RF transistor engineered specifically to meet the demanding requirements of ultra-high frequency (UHF) applications. This device exemplifies the pinnacle of performance, offering a robust combination of high power gain, low noise, and exceptional reliability, making it an indispensable component in modern RF design.
Designed for operation in the UHF spectrum up to 1 GHz and beyond, the BFS481 is optimized for use in high-power amplification stages. Its primary applications include critical roles in industrial, scientific, and medical (ISM) equipment, VHF/UHF broadcast transmitters, and aerospace and defense communication systems. The transistor is packaged in the robust SOT-143 package, which provides an excellent thermal footprint for efficient heat dissipation, ensuring stable performance under high-power operation.
A key strength of the BFS481 lies in its outstanding power gain performance, typically around 16 dB at 500 MHz. This high gain allows designers to achieve significant signal amplification with fewer stages, thereby simplifying circuit architecture, reducing component count, and enhancing overall system reliability. Furthermore, the transistor exhibits a low noise figure, which is paramount for preserving signal integrity and clarity in the receiver chain, ensuring minimal degradation of weak signals.
The device is characterized by its high collector-emitter breakdown voltage (VCEO = 20 V), which provides a wide dynamic range and a significant safety margin for handling voltage spikes and variations in load conditions. This ruggedness is further complemented by its excellent thermal stability, making it suitable for continuous-duty cycles in demanding environments.
Engineers value the BFS481 for its ability to deliver high output power with superior linearity, a critical factor for amplitude modulation (AM) and single-sideband (SSB) applications where signal distortion must be minimized. Its performance characteristics ensure that it can serve effectively as a driver or final amplifier in transmitter modules.
ICGOODFIND Summary: The Infineon BFS481 is a top-tier silicon NPN transistor that delivers high power gain, rugged reliability, and low-noise operation for demanding UHF power amplification, making it a cornerstone component for professional and industrial RF systems.
Keywords: UHF Amplifier, High Power Gain, Silicon NPN Transistor, Low Noise Figure, RF Power Transistor
