1. Description:
   • This is an N-Channel JFET (Junction Field-Effect Transistor) with the part number MMBFJ201. It comes
   • pre-soldered on a TO92 adapter board, making it easier to connect to your PCB. This version is the closest
   • you can get to the older Fairchild/ON Semiconductor J201, as the through-hole version is difficult to find.

The -40V InterFET J201 and J202 are targeted for sensitive amplifier stages for mid-frequencies
designs. Gate leakages are typically less than 10pA at room temperatures

Features
●InterFET N0016SH Geometry
Low Noise: 5 nV/VHz Typical
Low Ciss: 4pF Typical
●RoHS Compliant
●SMT, TH, and Bare Die Package options.
Applications
●Audio Amplifiers
●Small Signal Amplifier
●Ultrahigh Impedance Pre-Amplifier

The Fairchild J201 is a popular N-channel JFET (Junction Field-Effect Transistor) primarily used in audio applications.

It is widely used for amplification and switching purposes due to its low noise characteristics and high input impedance.

Type: N-channel JFET

1. Pin Configuration: The J201 typically comes in a TO-92 package with three pins: Gate (G), Drain (D), and Source (S).

2. Maximum Ratings: The maximum ratings for the J201 may vary slightly depending on the manufacturer, but typical

3. values are as follows:

   • Drain-Source Voltage (VDS): 25V
   • Gate-Source Voltage (VGS): -25V
   • Drain Current (ID): 50mA
   • Power Dissipation (PD): 350mW
   • Operating Temperature Range: -55°C to +150°C

4. Electrical Characteristics: The J201 has the following electrical characteristics (typical values):

   • Gate-Source Cutoff Voltage (VGS(off)): -0.3V to -6V
   • Gate-Source Breakdown Voltage (BVGS): -25V
   • Drain-Source Breakdown Voltage (BVDS): -40V to -50V
   • Drain-Source Saturation Current (IDSS): 1mA to 20mA
   • Forward Transconductance (gm): 1.5mS to 6mS

The Fairchild J201 is commonly used in audio preamplifiers, guitar effects pedals, and other low-power analog

audio applications. It is valued for its low noise performance and ability to work well with high-impedance signal

sources. However, please note that the Fairchild J201 has been discontinued by the manufacturer.

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