This post explains for the transistor.

The Part Number is B1342, 2SB1342.

The function of this semiconductor is 80V, 4A, PNP Transistor.

The package is TO-220Fa Type

Manufacturer: SavantIC

Preview images :

Description

B1342 is Silicon 80V, 4A, PNP Power Transistor. 

Characteristics:

1. Current flow: When a small current is applied to the base terminal, it allows a much larger current to flow from the emitter to the collector. This is called amplification or gain, and it makes the PNP transistor useful as an electronic switch or amplifier.

2. Voltage levels: The voltage levels in a PNP transistor are opposite to those in an NPN transistor. In a NPN transistor, the base-emitter junction is forward-biased and the collector-base junction is reverse-biased.

Features:

1. High DC current gain

2. Low saturation voltage

3. DARLINGTON

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = – 80 V

2. Collector to Emitter Voltage: Vceo = – 80 V

3. Emitter to Base Voltage: Vebo = – 7 V

4. Collector Current: Ic = 2 W

5. Collector Dissipation : Pc =

6. Junction Temperature: Tj = 150°C

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

Applications:

1. For low frequency power amplifier and power driver applications

B1342 PDF Datasheet

This post explains for the transistor.

The Part Number is A1943, 2SA1943.

The Package is TO-3P Type

The function of this semiconductor is 230V, PNP Transistor.

Manufacturer: Toshiba

Description

The A1943 is Silicon PNP Triple Diffused Transistor.

A silicon PNP triple-diffused transistor with a voltage rating of -230V and a current rating of -15A refers to a specific type of bipolar junction transistor (BJT) designed for high-voltage and high-current applications. Let’s break down the specifications:

1. PNP Type: The transistor is a PNP (Positive-Negative-Positive) transistor, which means it has three layers of semiconductor material: a lightly doped N-region sandwiched between two heavily doped P-regions. In a PNP transistor, current flows from the emitter (E) to the base (B) and then to the collector (C) when a small current is applied to the base.

2. Voltage Rating: The transistor has a maximum voltage rating of 230 volts (V). This means it can handle a maximum voltage of 230V in its operating conditions without the risk of damage.

3. Current Rating: The transistor has a maximum current rating of 15 amperes (A). This specifies the maximum continuous current that can flow through the transistor without exceeding its current handling capacity.

Features:

• High collector voltage: VCEO = −230 V (min)

• Complementary to 2SC5200

• Recommended for 100-W high-fidelity audio frequency amplifier output stage.

 

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = – 230 V

2. Collector to Emitter Voltage: Vceo = – 230 V

3. Emitter to Base Voltage: Vebo = – 5 V

4. Collector Current: Ic = – 15 A

5. Collector Power Dissipation : Pc = 150 W

6. Junction Temperature: Tj = 150°C

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

 

 

Applications:

1. Power Amplifier

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A1943 PDF Datasheet