BF244B

Overview

The BF244B is an N-channel RF JFET designed for amplifier and mixer applications operating up to 450 MHz. It features a maximum drain-source voltage of 30 V, a gate-source voltage rating of -30 V, and a continuous drain current of 50 mA. The device dissipates 350 mW at 25°C with a derating factor of 2.8 mW/°C above that temperature. Electrical characteristics include a zero-gate voltage drain current range of 6.0 to 15 mA, a forward transfer admittance of 5.6 mmhos at 1.0 kHz, and a cut-off frequency of 700 MHz. Input capacitance is typically 3.0 pF.

Feature Summary

• Designed for RF amplifier and mixer applications operating up to 450 MHz
• Suitable for analog switching requiring low capacitance
• N-channel depletion mode construction

Applications

• RF amplifiers
• Mixers
• Analog switching

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct binning and electrical tolerances. Confirm RoHS compliance status as historical data may vary by production date. Check for active manufacturing status or obsolescence notices before procurement planning.

Selection Notes

Select this component when designing circuits requiring low noise and high linearity in the VHF/UHF bands. Ensure the biasing network maintains the drain current within the specified range for optimal transconductance. Verify thermal management capabilities given the TO-92 package limitations.

Part Context

This part belongs to the BF244 family, which includes variants A, B, and C differentiated primarily by their zero-gate voltage drain current (IDSS) bins. The BF244B represents a mid-range IDSS specification compared to the lower IDSS of the BF244A and higher IDSS of the BF244C.

Replacement Considerations

Direct functional substitutes within the same family include the BF244A and BF244C, provided the IDSS binning requirements are met. Cross-manufacturer equivalents should be verified for pinout compatibility and RF performance parameters.