BFU550R

Overview

The BFU550 is an NPN wideband silicon RF transistor designed for high-speed, low-noise applications in a plastic SOT143B package. It features 11 GHz fT technology and AEC-Q101 qualification. Key electrical parameters include a collector-emitter voltage of 24 V, collector current up to 50 mA, and total power dissipation of 450 mW. At 900 MHz, it delivers a minimum noise figure of 0.7 dB and maximum stable gain of 21 dB. The device supports broadband amplification up to 2 GHz with output power at 1 dB compression reaching 13.5 dBm.

Feature Summary

• Low noise performance suitable for sensitive RF front-ends
• High breakdown voltage capability for robust operation
• Automotive electronics council qualified reliability
• Wide bandwidth coverage extending to 2 GHz

Applications

• Broadband amplifiers operating up to 2 GHz
• Low noise amplifiers for ISM band applications
• ISM band oscillators requiring high supply voltages

Procurement Notes

Verify the specific ordering suffix to confirm packaging configuration, as standard tape-and-reel quantities may vary by region. Ensure the component status remains active before finalizing design-in decisions. Cross-reference the marking code on the physical device against the datasheet table to validate authenticity and manufacturing origin prior to assembly.

Selection Notes

Select the BFU550 when designs require a combination of low noise figure and high breakdown voltage in a compact surface-mount footprint. Evaluate thermal resistance constraints carefully, as power dissipation limits are tied to solder point temperature. Consider the SOT143B dual-emitter pinout for optimal RF grounding and signal integrity in high-frequency layouts.

Part Context

The BFU550 belongs to the BFU5 family of transistors, which are engineered for small-signal to medium-power RF tasks. This series provides scalable solutions for wireless communication infrastructure and automotive electronics. The BFU550 specifically targets applications needing wideband performance with minimal signal degradation across industrial, scientific, and medical frequency bands.

Replacement Considerations

Official substitutes within the BFU5 family include the BFU520 and BFU530. These devices share similar packaging and general characteristics but differ in specific gain and noise specifications. Verify electrical compatibility and pinout alignment before substituting to ensure circuit stability.