BF1204,135

Overview

The BF1204,135 is a dual N-channel dual gate MOS-FET discrete semiconductor component manufactured by NXP USA Inc. It integrates two equal amplifiers with shared source and gate leads within a SOT363 micro-miniature plastic package. The device features internal bias circuits for DC stabilization and integrated protection diodes between gates and the source to handle input voltage surges. Key electrical parameters include a drain-source voltage rating of 10 V, a maximum drain current of 30 mA, and a total power dissipation of 200 mW at temperatures up to 102 °C. Forward transfer admittance ranges from 25 mS to 40 mS at 1 MHz, while noise figures are specified as low as 0.9 dB at 400 MHz.

Feature Summary

• Integrates two low-noise gain-controlled amplifiers in a single package
• Provides superior cross-modulation performance during automatic gain control
• Features high forward transfer admittance and admittance-to-capacitance ratio
• Includes internal bias circuits for DC stabilization and integrated 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 matches the required variant. Confirm that the component status aligns with current production requirements. Ensure compatibility with the target operating temperature range and supply voltage specifications. Review the most recently issued datasheet for any updates to pin configurations or absolute maximum ratings before finalizing design integration.

Selection Notes

Select this component for designs requiring dual independent amplification channels with minimal footprint. The shared source architecture simplifies circuit layout compared to separate devices. Evaluate thermal resistance characteristics against expected power dissipation levels. Consider the specific noise figure requirements at target frequencies when determining suitability for sensitive RF front-end stages.

Part Context

This component belongs to the NXP discrete semiconductors portfolio, specifically categorized under dual gate MOS-FETs. It is designed for high-frequency analog signal processing tasks where low noise and stable gain control are critical. The device utilizes a surface-mount package suitable for automated assembly processes in consumer electronics and professional communication hardware manufacturing lines.

Replacement Considerations

Consult official NXP documentation for verified substitute part numbers. Cross-reference pinout configurations and electrical parameters carefully. Verify package dimensions match existing board layouts. Ensure functional equivalents meet all absolute maximum rating constraints.

FAQ

What is the function of the integrated diodes in the BF1204?

Integrated diodes between the gates and source protect the device against excessive input voltage surges.

How does the BF1204 achieve DC stabilization?

Internal bias circuits enable DC stabilization and provide very good cross-modulation performance during AGC operation.

What is the maximum drain-source voltage rating?

The maximum drain-source voltage (VDS) rating is 10 V.