BFS540,115

Overview

The BFS540,115 is an NPN wideband transistor manufactured by NXP Semiconductors in a SOT-323 (SC-70) surface-mount package. It features a maximum collector-emitter voltage of 15 V and a DC collector current rating of 120 mA. The device provides a transition frequency of 9 GHz and a maximum unilateral power gain of 14 dB at 900 MHz. Total power dissipation is rated at 500 mW with the soldering point temperature maintained at or below 80 °C. Gold metallization ensures high reliability for RF applications.

Feature Summary

• High power gain suitable for broadband amplification
• Low noise figure optimized for sensitive signal reception
• Gold metallization structure for enhanced reliability

Applications

• RF wideband amplifier circuits
• Satellite TV systems
• Portable communication equipment

Procurement Notes

Verify the component status as the datasheet indicates potential discontinuation. Confirm the specific ordering suffix matches the required tape reel orientation and packaging standard. Ensure the supplier provides traceable documentation to validate authenticity against NXP specifications before integration into production designs.

Selection Notes

Select this component for designs requiring high-frequency performance up to 2 GHz with low noise characteristics. Evaluate thermal management requirements carefully, as power dissipation depends on maintaining the collector tab soldering point temperature within specified limits during operation.

Part Context

This part belongs to the BFS series of NPN silicon transistors designed for ultra-high frequency applications. The BFS540 utilizes a plastic SOT-323 envelope, offering a compact footprint compared to larger through-hole packages while maintaining robust RF performance metrics for consumer electronics and telecommunications hardware.

Replacement Considerations

Check for direct cross-references from manufacturers like New Jersey Semi-Conductor. Verify pinout compatibility and electrical parameters such as transition frequency and noise figure when substituting with other SOT-323 NPN wideband transistors.

FAQ

What is the maximum operating junction temperature?

The maximum junction temperature is 175 °C.

How is the collector capacitance defined?

Collector capacitance is typically 0.9 pF under conditions of zero AC collector current, 8 V collector-base voltage, and 1 MHz frequency.

What is the feedback capacitance value?

The feedback capacitance is typically 0.6 pF when measured with zero collector current, 8 V collector-base voltage, and 1 MHz frequency.