1. Feet 2011
2. Fit 2019

J201 J202 This device is designed primarily for low level audio and general purpose applications with high impedance signal sources. Sourced from Process 52. Absolute Maximum Ratings. TA = 25°C unless otherwise noted MMBFJ201 MMBFJ202.These ratings are limiting values above which the serviceability of any semiconductor device may be impaired. Unfortunately, Tillman's amplifier requires a J201 FET. The J201 is a very special device and an excellent choice. Yet it's uncommon to hobbyists. But my site solves the mystery. I've designed a similar preamplifier with an everyday JFET. ABOUT MPF102 SUBSTITUTES. In short, there aren't any. It may be possible to replace them with other JFETs, but only on a few circuits - most pedals that require these JFETS don't really work very well with replacements.(I think I read somewhere that J230 work in some builds that spec J201). When you take into account the amount of fake 2N5457 and J201 transistors that you will come across - especially from Chinese ebay. There are no models available for Fairchild Semiconductor J201 yet. We can contact you when ECAD models become available. If you need symbols, footprints, or 3D models immediately, you may purchase them here. Your first request is free! Semiconductor (Transistor, diode, IC) Cross reference.

J201 is a general purpose amplifier JFET transistor, in this post we will discuss about J201 transistor pinout, equivalent, uses, features & other details about this transistor.

Features / Technical Specifications:

• Package Type: TO-92
• Transistor Type: N Channel
• Max Voltage Applied From Gate to Source: –40
• Max Drain to Gate Voltage Should Be: 40V
• Max Continues Gate Current is: 50mA
• Minimum to Maximum Gate to Source Cuttoff Voltage : -0.3 to -1.5
• Max Power Dissipation is: 350mW
• Max Storage & Operating temperature Should Be: -55 to +150 Centigrade
• Very Low Noise & High Gain

J201 Replacement and Equivalent:

2N4338, 2N4339, 2N4340, 2N4341, 2N5458, 2N5459, 2N5457, NTE458 (Note: Pin configuration of the equivalent transistors may different from J201, therefore it is recommended to check pin configuration of the transistor you are using in the place of J201)

J201 Transistor Explained / Description:

J201 is a general purpose JFET transistor build for amplification purposes. It is manufactured in TO-92 and SOT-23 packages. The transistor is having some good features in its small packages like low cutoff voltage, Very low noise and high gain etc. with these features it can perform very well where there is requirements of more gain with low noise amplification of signals. Moreover due to its low power operating capabilities which are as low as 1.5V it is ideal to use in battery powered circuits.

Where We Can Use it & How to Use:

J201 can be used in variety of low level signal amplification purposes for example if one wants to amplify a low gain signal to high gain with filtration of noise. It can be used in audio preamplifiers, mic preamplifiers and related circuits. Other than that it can also be used in infrared signal detection and amplification.

Applications:

Sensor Circuits

Audio Preamp circuits

Audio Amplifier Stages

Laser Detection & Data Amplifications

Infrared Detection & Data Amplifications

How to Safely Long Run in a Circuit:

For getting long term reliable performance from J201 FET transistor do drive load of more than 50mA, do not increase gate to source voltage from -40V and drain to gate voltage from 40V. And always store and operate the transistor in temperature above -55 centigrade and below +150 centigrade.

Feet 2011

Datasheet:

To Download the datasheet just copy and paste the below link in your browser.

https://pdf1.alldatasheet.com/datasheet-pdf/view/245178/FAIRCHILD/J201/+Q_W28-VDvHSEIlOpfPzYz+/datasheet.pdf

J201

Fit 2019