BF1212,215

Overview

The BF1212,215 is an N-channel dual-gate MOS-FET manufactured by NXP Semiconductors. It features a short channel design with high forward transfer admittance to input capacitance ratio. The device operates with a drain-source voltage of 6 V and a drain current of 30 mA. Total power dissipation is rated at 180 mW. Forward transfer admittance ranges from 28 to 43 mS. Input capacitance at gate 1 is typically 1.7 pF. Noise figure is 1.1 dB at 800 MHz. Cross-modulation input level for 1% distortion at 40 dB AGC is 104 dBμV. Junction temperature maximum is 150 °C.

Feature Summary

• Dual-gate architecture providing low noise gain controlled amplification capabilities
• Integrated partly internal self-biasing circuit ensuring good cross-modulation performance during automatic gain control
• Excellent low frequency noise performance suitable for sensitive signal applications
• Short channel transistor design optimizing the forward transfer admittance to input capacitance ratio

Applications

• Gain controlled low noise VHF amplifiers
• Gain controlled low noise UHF amplifiers
• 5 V digital television tuner applications
• 5 V analog television tuner applications

Procurement Notes

Verify the specific ordering suffix matches the required package variant. The standard BF1212 uses SOT143B. Variants include BF1212R in SOT143R and BF1212WR in SOT343R. Confirm pinning orientation as reverse pinning versions exist. Ensure anti-static handling protocols are followed during transport and assembly due to electrostatic discharge sensitivity.

Selection Notes

Select based on required package footprint and pin configuration. Standard BF1212 utilizes SOT143B. Reverse pinning options are available in SOT143R and SOT343R packages. Verify thermal resistance requirements against soldering point temperature limits. Ensure operating conditions remain within the 6 V drain-source voltage and 30 mA drain current absolute maximum ratings.

Part Context

This component belongs to the N-channel dual-gate MOS-FET family produced by NXP Semiconductors. It is designed specifically for RF amplifier stages requiring gain control. The device integrates protection diodes between gates and source to guard against excessive input voltage surges. It serves as a core active element in tuner front-ends where low noise and stable DC operation are critical.

Replacement Considerations

BF1212R (SOT143R package) and BF1212WR (SOT343R package) offer alternative physical footprints with reverse pinning configurations while maintaining identical electrical characteristics.

FAQ

How does the device handle input voltage surges?

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

What is the purpose of the internal self-biasing circuit?

The partly internal self-biasing circuit ensures good cross-modulation performance during automatic gain control and provides good DC stabilization.

What is the typical noise figure at 800 MHz?

The typical noise figure at 800 MHz is 1.1 dB when the source impedance is optimized.