BF1109WR,115

Overview

The BF1109WR,115 is an N-channel dual-gate enhancement-mode MOSFET in a SOT343R surface-mount package. It features a drain-source voltage of 11 V and a continuous drain current of 30 mA with total power dissipation of 200 mW at 80 °C. The device provides a forward transfer admittance of up to 30 mS and operates up to 1 GHz. Key dynamic parameters include a noise figure of 1.5 dB at 800 MHz and gate threshold voltages between 0.3 V and 1.2 V.

Feature Summary

• Dual-gate architecture enabling low-noise amplification up to 1 GHz
• Integrated self-biasing circuit for DC stabilization and cross-modulation performance
• Internal diodes protect gates against excessive input voltage surges

Applications

• VHF and UHF television tuners
• Professional communications equipment
• Low noise gain controlled amplifier circuits

Procurement Notes

Verify the specific suffix WR corresponds to the SOT343R package variant during procurement. Confirm the product status as production data before initiating designs. Ensure anti-static handling protocols are followed due to ESD sensitivity. Cross-reference the latest datasheet revision to confirm pinning and thermal characteristics match the intended PCB layout requirements.

Selection Notes

Select this component for RF applications requiring high forward transfer admittance relative to input capacitance. The dual-gate structure supports automatic gain control (AGC) functions effectively. Verify that the 11 V drain-source voltage rating aligns with the system supply voltage. Consider the SOT343R footprint constraints when designing the printed-circuit board layout.

Part Context

This part belongs to the BF1109 series of N-channel dual-gate MOS-FETs manufactured by NXP Semiconductors. The BF1109WR specifically utilizes the SOT343R plastic surface-mounted package. It is designed for short-channel transistor applications where high frequency performance and low noise are critical requirements.

Replacement Considerations

BF1109 and BF1109R are related variants within the same family but utilize different packages (SOT143B and SOT143R respectively). Verify pinout compatibility and physical dimensions before substituting these parts.