2N547 N-Channel JFET

The 2N547 is an age old JFET that was commonly used in Pre-Amp circuits. The JFET has VDS of 25V and VGS of 25V with a Gate current of 10mA. The FET also has high Input Impedance and Low Input Capacitance.

 

Pin Configuration

Pin Number	Pin Name	Description
1	Drain	Current flows in through Drain pin
2	Source	Controls the biasing of FET
3	Gate	Current flows out through Drain, normally connected to ground.

 

Features

• General Purpose N-Channel Junction Field Effect Transistor
• Drain-Source voltage (VDS) is 25 V
• Maximum Drain current: 5mA
• Drain-Gate voltage (VDG) is 25V
• Gate-Source Voltage (VGS) is 25V
• Continuous Gate Current (IG) is 10mA
• Available in To-92 and SOT54 Package

Note: Complete Technical Details can be found at the datasheet given at the end of this page.

 

2N547 Equivalents

MMBFJ201, TIS158

 

Brief Description on 2N547

The 2N547 is a JFET that has been used in many amplification circuits because of its low price. The JFET is currently no longer in production but till the demand for it has created many clones in the market. The closest equivalent for 2N547 is the MMBFJ201 JFET but it is available only on SMD package.

The clone FETs available in the market does not seem to follow the datasheet strictly. Hence be careful which employing one in your designs. Provided you have the right FET, it can be used in pre-amp circuit to achieve gain of +12dB or high. If you cannot find the supplier, then consider upgrading to TIS158 which his slightly pricy but availability will not be a problem.

 

Applications

• Amplifier circuits
• Pre-Amp applications
• Audio noise cancelation

 

2D model of the component

If you are designing a PCB or Perf board with this component then the following picture from the 2N547 Datasheet will be useful to know its package type and dimensions.