BFG520/X,215

Overview

The BFG520/X,215 is an NPN silicon planar epitaxial transistor designed for RF frontend applications in the GHz range. It features a transition frequency of 9 GHz and a maximum unilateral power gain of 19 dB at 900 MHz. The device operates with a collector-emitter voltage of 15 V and a DC collector current limit of 70 mA, dissipating up to 300 mW of total power. Encapsulated in a 4-pin SOT143R surface-mount package, it offers low noise figures starting at 1.1 dB and high reliability through gold metallization.

Feature Summary

• High power gain suitable for broadband amplification
• Low noise figure optimized for sensitive receiver stages
• Gold metallization ensures excellent long-term reliability

Applications

• Analog and digital cellular telephones
• Cordless telephones (CT1, CT2, DECT)
• Satellite TV tuners (SATV)
• Radar detectors
• Repeater amplifiers in fibre-optic systems

Procurement Notes

Verify the specific pin configuration required for the design, as the BFG520/X utilizes reverse pinning compared to the standard BFG520 variant. Confirm that the SOT143R package footprint matches the PCB layout. Ensure the application environment stays within the specified thermal resistance limits to maintain junction temperature below 175 °C during operation.

Selection Notes

Select this component when a wideband NPN transistor with high transition frequency is needed for GHz-range signal processing. The BFG520/X is appropriate for designs requiring low noise performance combined with moderate power handling capabilities. Consider the reverse pinout if replacing legacy Philips Semiconductors parts in existing hardware layouts.

Part Context

This part belongs to the BFG520 family of NPN wideband transistors manufactured by NXP Semiconductors. The 'X' suffix indicates the specific reverse pinning configuration housed in the SOT143R envelope. These devices are successors to earlier Philips Semiconductors products, maintaining identical electrical characteristics while updating branding and documentation standards.

Replacement Considerations

BFG520/XR,215

FAQ

What is the difference between BFG520 and BFG520/X?

The primary difference is the pin configuration. The BFG520 uses standard pinning (Collector-Base-Emitter-Emitter), while the BFG520/X uses reverse pinning (Collector-Emitter-Base-Emitter). They share identical electrical specifications.

What is the maximum operating junction temperature?

The maximum junction temperature (Tj) is 175 °C. The total power dissipation is rated at 300 mW up to a soldering point temperature of 88 °C.

What is the typical noise figure at 900 MHz?

At a collector current of 5 mA and VCE of 6 V, the minimum noise figure is typically 1.1 dB at 900 MHz. At 20 mA under the same conditions, it is typically 1.6 dB.