BF244A

Overview

The BF244A is an N-channel RF amplifier JFET designed for applications operating up to 450 MHz. It features a TO-92 package with a maximum drain-source voltage of 30 V and a total device dissipation of 350 mW at 25°C. The zero-gate voltage drain current ranges from 2.0 mA to 6.5 mA, while the forward transfer admittance is typically 3.0 mmhos at 1.0 kHz and 5.6 mmhos at 200 MHz. Input capacitance is 3.0 pF, and reverse transfer capacitance is 0.7 pF. The cut-off frequency reaches 700 MHz, supporting high-frequency signal processing.

Feature Summary

• Optimized for RF amplifier and mixer applications in the VHF/UHF bands
• Designed for analog switching requiring low input capacitance
• Utilizes Process 50 technology for consistent performance

Applications

• RF amplifier circuits operating up to 450 MHz
• Mixer applications in radio frequency systems
• Analog switching requiring low capacitance characteristics

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and specific lot traceability requirements before integration. Ensure storage conditions remain within the specified temperature range to maintain junction integrity. Review datasheet revisions for any updates to absolute maximum ratings prior to final design approval.

Selection Notes

Select the BF244A when low noise figure and high cut-off frequency are required for VHF/UHF designs. Compare drain current specifications against circuit biasing needs to ensure operation within the 2.0 mA to 6.5 mA range. Evaluate thermal resistance values for heat dissipation planning in enclosed environments. Consider package constraints as the TO-92 form factor limits power handling capabilities compared to surface mount alternatives.

Part Context

This component belongs to the BF244 series, which includes variants A, B, and C differentiated primarily by zero-gate voltage drain current thresholds. The BF244A represents the lowest current variant in this family, suitable for low-power RF amplification tasks. Originally manufactured by Fairchild Semiconductor, the product line has been discontinued, necessitating careful evaluation of available stock sources.

Replacement Considerations

Public confirmed substitute part numbers: BF244B, BF244C.