BF1204,115

Overview

The BF1204 is a dual N-channel dual gate MOS-FET discrete semiconductor device manufactured by NXP Semiconductors. It integrates two equal amplifiers with shared source and gate leads within a SOT363 micro-miniature plastic package. The component operates with a drain-source voltage of 10 V, a DC drain current of 30 mA, and total power dissipation of 200 mW. Key electrical parameters include a forward transfer admittance of 25 to 40 mS at 1 MHz, an input capacitance of 1.7 to 2.2 pF, and a noise figure ranging from 0.9 to 1.8 dB depending on frequency.

Feature Summary

• Integrates two low-noise gain-controlled amplifiers in a single package for superior cross-modulation performance during automatic gain control.
• Features high forward transfer admittance and a high ratio of admittance to input capacitance.
• Includes internal bias circuits for DC stabilization and integrated diodes between gates and source to protect against excessive input voltage surges.

Applications

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

Procurement Notes

Verify the specific ordering suffix and manufacturing origin code against the latest official datasheet before procurement. Confirm that the component status remains active or qualified for production use. Ensure handling procedures account for anti-static packaging requirements to prevent electrostatic discharge damage during transport and assembly.

Selection Notes

Select this component for designs requiring dual-gate MOS-FET topology with integrated AGC capabilities. Evaluate thermal resistance characteristics relative to the application's operating temperature constraints. Verify compatibility with the required supply voltage range of 3 to 9 V and ensure the SOT363 package dimensions fit the target PCB layout.

Part Context

This device belongs to the NXP discrete semiconductors portfolio, specifically categorized under RF MOS-FET transistors. It is designed for micro-miniature surface-mount applications, providing a compact solution for signal processing stages in radio frequency systems where low noise and high linearity are critical design parameters.

Replacement Considerations

Consult the official NXP documentation for confirmed substitute part numbers. Do not assume functional equivalence with other dual-gate MOS-FETs without verifying pinout, electrical limits, and package compatibility through direct datasheet comparison.

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 automatic gain control operation.

What package type is used for the BF1204?

The transistor utilizes a SOT363 micro-miniature plastic package with six leads.