BFU725F/N1,115

Overview

The BFU725F/N1 is an NPN silicon germanium microwave transistor designed for high-speed, low-noise applications. It operates in a plastic SOT343F package with reverse pinning and dual emitter pins to minimize inductance. The device utilizes 110 GHz fT technology, providing a maximum stable gain of 27 dB at 1.8 GHz and a noise figure of 0.7 dB at 5.8 GHz. Key electrical parameters include a collector-base voltage of 10 V, a collector-emitter voltage of 2.8 V, and a total power dissipation of 136 mW. The transition frequency reaches 55 GHz under standard test conditions.

Feature Summary

• Low noise performance optimized for sensitive RF front-end stages
• High gain characteristics suitable for wideband amplification
• Dual emitter design reduces parasitic inductance for improved RF performance

Applications

• Second LNA stage and mixer stage in DBS LNBs
• Satellite radio receivers
• Low noise amplifiers for microwave communications systems
• WLAN and CDMA applications
• Ka band oscillators (DROs)

Procurement Notes

Verify the specific ordering suffix against current NXP documentation to confirm manufacturing origin and compliance status. Ensure ESD handling precautions are strictly followed during storage and assembly, as the device is sensitive to electrostatic discharge. Confirm that the application environment remains within the specified thermal and voltage limiting values to prevent permanent damage.

Selection Notes

Select this component when designing circuits requiring low noise figures below 1 GHz up to microwave frequencies. Consider the SOT343F package constraints and the need for external biasing networks to optimize noise versus gain trade-offs. Evaluate the 2.8 V collector-emitter voltage limit to ensure compatibility with low-voltage system architectures.

Part Context

This part belongs to NXP's silicon germanium (SiGe) discrete transistor portfolio. SiGe technology offers advantages such as low noise, fast switching speeds, and CMOS compatibility compared to traditional GaAs alternatives. The BFU725 series is specifically engineered for cost-sensitive RF designs requiring high performance in compact surface-mount packages.

Replacement Considerations

No public confirmed substitute part numbers are documented in the provided datasheet.