BF1101,215

Overview

The BF1101,215 is an N-channel dual-gate MOS-FET designed for low noise gain-controlled amplifier applications up to 1 GHz. It features a short channel transistor with high forward transfer admittance to input capacitance ratio and partly internal self-biasing circuitry to ensure good cross-modulation performance during AGC and good DC stabilization. The device operates with a drain-source voltage of 7 V and a maximum drain current of 30 mA. Key electrical parameters include a typical forward transfer admittance of 30 mS, an input capacitance at gate 1 of 2.2 pF, and a noise figure of 1.7 dB at 800 MHz.

Feature Summary

• Dual-gate architecture providing low noise amplification capabilities up to 1 GHz
• Internal self-biasing circuit ensures stable DC operation and improved cross-modulation performance during automatic gain control
• Integrated protection diodes between gates and source safeguard against excessive input voltage surges

Applications

• Television tuners
• Professional communications equipment
• VHF and UHF applications requiring 3 to 7 V supply voltage

Procurement Notes

Verify the specific package variant required, as the BF1101 family includes SOT143B, SOT143R, and SOT343R options. Confirm that the component meets RoHS3 compliance standards if applicable to your manufacturing process. Ensure electrostatic discharge precautions are followed during handling due to the anti-static packaging requirements specified in the datasheet.

Selection Notes

Select this component for designs requiring a dual-gate MOSFET with integrated self-biasing for stable AGC operation. Consider the 7 V drain-source voltage limit and 30 mA drain current capability when sizing power supplies. Evaluate the noise figure and cross-modulation specifications against system sensitivity requirements for VHF and UHF frequency bands.

Part Context

The BF1101 belongs to a series of N-channel dual-gate MOS-FETs manufactured by NXP Semiconductors. Related variants include the BF1101R and BF1101WR, which differ primarily in their plastic package configurations (SOT143R and SOT343R respectively). These devices share identical electrical characteristics but offer different physical mounting options for surface-mount technology assembly.

Replacement Considerations

Direct substitutes within the same product line include BF1101R and BF1101WR. Verify pinout compatibility, particularly regarding reverse pinning differences between SOT143B and SOT143R/SOT343R packages, before implementing any package variation swap in existing layouts.