BF1205,115

Overview

The BF1205 is a dual N-channel dual gate MOS-FET in an SOT363 package. It contains two amplifiers with shared source and gate 2 leads, plus an integrated switch operated by amplifier b's gate 1 bias. Key electrical parameters include a drain-source voltage of 10 V, DC drain current of 30 mA, and power dissipation of 200 mW. Forward transfer admittance reaches 140 mS at 12 mA. Noise figures are 1.9 dB at 800 MHz for amplifier a and 2.1 dB for amplifier b.

Feature Summary

• Combines two low noise gain controlled amplifiers in a single package
• Features an internal switch to reduce external component count
• Provides superior cross-modulation performance during AGC
• Includes integrated diodes between gates and source for surge protection

Applications

• Gain controlled low noise amplifiers for VHF applications
• Gain controlled low noise amplifiers for UHF applications
• Digital television tuners
• Analog television tuners
• Professional communications equipment

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging details. Confirm that the device status aligns with project requirements, as discrete semiconductor availability may change. Ensure electrostatic discharge handling protocols are followed during transport and assembly to prevent damage to the micro-miniature plastic package.

Selection Notes

Select this component for designs requiring dual independent amplification within a compact footprint. The integrated switch functionality simplifies circuit topology by reducing the number of required external components. Verify that the operating frequency range and supply voltage requirements match the specified 5 V operation for optimal noise figure and gain performance.

Part Context

This device belongs to the NXP Semiconductors discrete semiconductor portfolio, specifically categorized under RF MOSFET transistors. It utilizes silicon technology and is designed for surface mount installation. The component is part of a broader range of small-signal devices intended for high-frequency signal processing and amplification tasks.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.