BF904R,215

Overview

The BF904R,215 is an N-channel dual gate MOS-FET in a SOT-143R package. It operates with a drain-source voltage of 7 V and a maximum drain current of 30 mA. The device features a forward transfer admittance of 25 mS and an input capacitance at Gate 1 of 2.2 pF. Noise figures are 1 dB at 200 MHz and 2 dB at 800 MHz. Total power dissipation is 200 mW.

Feature Summary

• Dual gate architecture designed for low noise gain controlled amplification up to 1 GHz
• Internal bias circuit ensures superior cross-modulation performance during automatic gain control
• Short channel transistor provides high transfer admittance to input capacitance ratio

Applications

• Television tuners
• Professional communications equipment
• VHF and UHF applications

Procurement Notes

Verify the specific ordering suffix

Selection Notes

Select this component for RF front-end designs requiring low noise and high linearity. Ensure the operating supply voltage remains within the 3 V to 7 V range. Verify that the required frequency coverage aligns with the specified noise figure and admittance characteristics for optimal signal integrity.

Part Context

This part belongs to the BF904 series of N-channel dual gate MOS-FETs manufactured by NXP Semiconductors. It utilizes a plastic microminiature SOT-143R surface mount package. The device integrates an amplifier MOS-FET with source and substrate interconnected to support stable operation in radio frequency circuits.

Replacement Considerations

The BF904 is a compatible substitute within the same product family. Verify pin compatibility and electrical specifications against the BF904 datasheet before implementation.

FAQ

What is the function of the internal bias circuit?

The internal bias circuit ensures good cross-modulation performance during automatic gain control (AGC) operations.

How does the package configuration differ from the BF904?

The BF904R uses the SOT-143R package with reverse pinning compared to the standard SOT-143B package used by the BF904.

What is the typical noise figure at 800 MHz?

The typical noise figure is 2 dB when operating at 800 MHz under specified conditions.