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This is one of the transistor types.

This post explains for the transistor NPN Transistor.

Part Number : D718

Function : NPN TRIPLE DIFFUSED TYPE Power Transistor

Manufacturers : Toshiba

Package : TO-247, TO-3, 2-16B1A Type

See the preview image and the PDF file for more information.

Image :

Description :

This transistor designed for use in general-purpose amplifier and switching application.

D718 Features

1. Complementary to 2SB688
2. Recommended for 45 ~ 50W audio frequency amplifier output stage.
3. AUDIO FREQUENCY POWER AMPLIFIER APPLICATIONS.

Maximum Ratings ( Ta=25’C )

1. Collector-Base Voltage : Vcbo = 120V

2. Collector-Emitter Voltage : Vceo = 120V

3. Emitter-Base Voltage : Vebo = 5V

4. Collector Current : Ic = 8A

5. Base Current : Ib = 0.8A

6. Collector Power Dissipation : Pc = 80W

Pinout

Other data sheets within the file : 2SD718

This is one of the transistor types.

Part Number : D2012, 2SD2012

Function : Silicon NPN Triple Diffused Type Transistor

Package : TO-220 Type

Manufactures : Toshiba Semiconductor

Image

Description

Audio Frequency Power Amplifier Applications

1. Low saturation voltage: VCE (sat)= 0.4 V (typ.) (IC= 2A / IB= 0.2A)

2. High power dissipation: PC= 25 W (Tc = 25°C)

Pinout

Absolute Maximum Ratings

1. Collector-base voltage : VCBO = 60 V

2. Collector-emitter voltage : VCEO = 60 V

3. Emitter-base voltage : VEBO = 7 V

4. Collector current : IC = 3 A

5. Base current : IB = 0.5 A

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