Series:	--
Packaging:	Tape & Box (TB)
Part Status:	Obsolete
Transistor Type:	NPN
Current - Collector (Ic) (Max):	1A
Voltage - Collector Emitter Breakdown (Max):	50V
Vce Saturation (Max) @ Ib, Ic:	400mV @ 50mA, 500mA
Current - Collector Cutoff (Max):	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	85 @ 500mA, 10V
Power - Max:	1W
Frequency - Transition:	200MHz
Operating Temperature:	150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 Long Body
Supplier Device Package:	TO-92NL-A1
Base Part Number:	2SC3940

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

2SC3940AQA Application Field and Working Principle

Introduction

The 2SC3940AQA is a single transistor manufactured by RoHS-compliant Japanese transistor company Toshiba. It is an NPN bipolar junction transistor (BJT) and is composed of an N-type semiconductor layer sandwiched between two P-type layers. 2SC3940AQA transistors have excellent current gain, protection circuitry, and pre-bias stability, making them perfect for switching and amplifier applications.

Applications of 2SC3940AQA

2SC3940AQA transistors are suitable for use in a wide range of applications. Common applications include low-frequency amplifiers and switching circuits, especially in medical equipment, power supplies, and automotive applications.

Amplifier Applications

2SC3940AQA transistors are excellently suited for low-frequency amplifier applications. Due to its excellent current gain, which can reach up to 1000, it is capable of providing excellent gain in both AC and DC applications. Furthermore, its pre-bias stability allows it to take input signals with little distortion. This is especially useful for time-sensitive applications such as medical equipment.

Switching Applications

Another common use of 2SC3940AQA transistors is in switching applications. It has a reach-through current that can support up to 200mA, allowing it to easily switch on and off circuits. This makes it ideal for use in automotive applications, such as controlling the headlights and taillights of a vehicle. In addition, its protection circuitry prevents damage in the event of a reverse-voltage up to 30V.

Working Principle of 2SC3940AQA

The 2SC3940AQA transistor is composed of three layers of semiconductor material. The N-type layer is sandwiched between two P-type layers. The N-type material lets electrons move freely, while the P-type material restricts the movement of electrons. When a voltage is applied to the N-type layer, it attracts electrons and thus increases the current flow. This is known as forward biasing and allows the transistor to amplify signals. When the voltage is reversed, the current flow is reversed as well, preventing any further current flow and thus protecting the transistor. This is known as reverse biasing.

Conclusion

The 2SC3940AQA is a single transistor that is well-suited for amplifier and switching applications. It has an excellent current gain of up to 1000 and pre-bias stability that allows it to take input signals with little distortion. It also has protection circuitry that prevents damage in the event of a reverse voltage up to 30V. The 2SC3940AQA transistor is manufactured by RoHS-compliant Japanese transistor company Toshiba and is ideal for use in medical equipment, power supplies, and automotive applications.

The specific data is subject to PDF, and the above content is for reference

Part Number	Manufacturer	Price	Quantity	Description