C4138 PDF – 400V, 10A, NPN, Equivalent, 2SC4138 Transistor

Part Number: C4138, 2SC4138

Function: 400V, 10A, Silicon NPN Transistor

Package: TO-3P Type

Manufacturer: Sanken electric


C4138 transistor


This is Silicon NPN Triple Diffused Planar Transistor. (High Voltage and High Speed Switchihg Transistor)

The C4138 transistor can be used in a range of high-power applications, including audio amplifiers, power supplies, motor control circuits, and general-purpose switching applications.

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 500 V

2. Collector to Emitter Voltage: Vceo = 400 V

3. Emitter to Base Voltage: Vebo = 10 V

4. Collector Current: Ic = 10 A

5. Collector Dissipation : Pc = 80 W ( Tc=25°C )

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -55 ~ +150°C


C4138 PDF transistor

Characteristics of NPN Transistors

1. Bipolar Junction: NPN transistors are bipolar junction transistors (BJT), meaning they have a structure consisting of three regions of alternating P-type and N-type semiconductors.

2. Current Amplification: NPN transistors are designed to amplify electrical current, and can be used in a wide range of electronic applications such as amplifiers, switches, and oscillators.

3. Forward Biased: In order to operate, the base-emitter junction of an NPN transistor must be forward biased, meaning that the base must be connected to a positive voltage relative to the emitter.

4. High Input Impedance: NPN transistors have a high input impedance, which means that they are less likely to draw current from the input source, and are therefore less likely to cause a drop in voltage across the source.

5. Inverted Output: NPN transistors are known for producing an inverted output relative to their input. That is, if the input signal is high, the output signal will be low, and vice versa. This behavior is due to the way the transistor is designed and is an important characteristic for many electronic applications.


1. Switching Regulator and General Purpose



C4138 PDF Datasheet

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