BFG540W/XR,135

Overview

The BFG540W/XR,135 is an NPN silicon planar epitaxial transistor designed for wideband applications in the GHz range. It features a transition frequency of 9 GHz and a maximum unilateral power gain of 16 dB at 900 MHz. The device operates with a collector-emitter voltage of 15 V and supports a DC collector current up to 120 mA. Total power dissipation reaches 500 mW at a soldering point temperature of 85 °C or lower. It utilizes gold metallization for reliability and is housed in a 4-pin dual-emitter SOT343R plastic package.

Feature Summary

• High power gain suitable for broadband RF front ends
• Low noise figure optimized for signal amplification
• High transition frequency enabling operation up to 9 GHz
• Gold metallization ensures excellent long-term reliability

Applications

• Analog and digital cellular telephones
• Cordless telephones (CT2, CT3, PCN, DECT)
• Satellite television tuners (SATV)
• MATV/CATV amplifiers and repeater amplifiers in fibre-optic systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm pin configuration and packaging orientation. Confirm that the component status aligns with project requirements, as availability may vary. Ensure compliance with RoHS directives if applicable to the target market. Validate thermal management capabilities based on the specified junction-to-soldering point thermal resistance.

Selection Notes

Select this component for designs requiring high-frequency performance with low noise characteristics. Consider the SOT343R package dimensions for PCB layout constraints. Evaluate the operating conditions against the absolute maximum ratings to prevent device stress. Verify impedance matching networks for optimal gain and noise figure performance at the target frequency.

Part Context

This part belongs to the BFG540W series of NPN wideband transistors manufactured by NXP Semiconductors. The XR variant specifically denotes the reverse pinning configuration within the SOT343R package. This series is engineered for microwave and radio frequency applications where high linearity and gain are critical.

Replacement Considerations

Consult the official datasheet for compatible alternatives such as the BFG540W/X or BFG540W. Verify pinout compatibility and electrical specifications before substitution. Cross-reference package dimensions to ensure mechanical fit.