onsemi

BFR31LT1G

BFR31LT1G Description

The BFR31LT1G from onsemi is an N-channel JFET housed in a compact SOT23-3 surface-mount package, designed for high-performance signal processing and switching applications. With a drain-to-source voltage (Vdss) of 25V and a maximum power dissipation of 225 mW, this JFET offers reliable operation in low-power circuits. Its low input capacitance (5pF @ 10V) ensures minimal signal distortion, making it suitable for high-frequency applications. The device features a cutoff voltage (VGS off) of 2.5V @ 0.5 nA, enabling precise control in analog and RF circuits. Although marked as obsolete, it remains a viable choice for legacy designs requiring stable, low-noise performance.

BFR31LT1G Features

• Low Input Capacitance: 5pF @ 10V minimizes parasitic effects in high-frequency circuits.
• Precise Cutoff Voltage: 2.5V @ 0.5 nA ensures consistent performance in analog switching.
• Low Leakage Current: 1 mA @ 10V (Idss) enhances efficiency in battery-operated devices.
• Surface-Mount Design: SOT23-3 package enables compact PCB layouts.
• Wide Operating Voltage: Supports up to 25V Vdss for versatile applications.
• Moisture-Resistant: MSL 1 (Unlimited) rating ensures reliability in varied environments.

BFR31LT1G Applications

• RF Amplifiers: Low noise and high-frequency stability make it ideal for RF front-end circuits.
• Analog Switches: Precise cutoff voltage ensures accurate signal routing.
• Sensor Interfaces: Low leakage current suits high-impedance sensor readouts.
• Oscillators & Mixers: Minimal input capacitance reduces phase noise in timing circuits.
• Legacy Electronics: A dependable choice for maintaining or repairing older systems.

Conclusion of BFR31LT1G

The BFR31LT1G is a high-performance N-channel JFET offering low noise, stable cutoff characteristics, and compact packaging. While obsolete, its low input capacitance and precise voltage control make it valuable for RF, analog, and sensor applications. Engineers seeking a reliable JFET for high-frequency or low-power designs may still find this component advantageous, particularly in space-constrained or legacy systems.