This post describes for the PNP transistor.

The Part Number is A1274, KTA1274.

The function of this semiconductor is 80V, 400mA, PNP Transistor.

The package is TO-92L Type

The manufacturer of this part is KEC.

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

Description

A A1274 PNP transistor is a type of bipolar junction transistor (BJT) with a different structure and polarity compared to an NPN transistor.

Structure: A PNP transistor has a sandwich-like structure, consisting of a thin N-type layer (base) sandwiched between two P-type layers (emitter and collector).

Polarity: In a PNP transistor, the majority charge carriers are holes, which flow from the emitter to the collector. The emitter is negative relative to the base, and the collector is positive relative to the base.

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.

Features:

1. Complementary to KTC3227.

Maximum Ratings (Ta=25°C)

1. Collector-Base Voltage: Vcbo = -80 V
2. Collector-Emitter Voltage: Vceo = -80 V
3. Emitter Base Voltage: Vebo = -5 V
4. Collector Current :  Ic = -400 mA
5. Emitter Current : Ie = 400 mA
6. Collector Power Dissipation : Pc = 1 W

Application:

General Purpose.

A1274 PDF Datasheet

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Part Number: B1151, 2SB1151

Function: – 60V, – 5A, PNP Transistor

Package: TO-126 Type

Manufacturer: NEC

Images:

Description

B1151 is PNP Silicon Power Transistor. The 2SB1151 is a Low Vce(sat) transistor which has a large current capability and wide SOA. It is suitable for DC-DC converter, or driver of solenoid or motor.

The operation of a PNP transistor is based on the biasing of its three layers: the emitter, base, and collector. The emitter is connected to the positive power supply, the base is the control terminal, and the collector is connected to the load or circuit.

When a small current flows into the base terminal, it controls a larger current flowing between the emitter and collector. The transistor amplifies the input signal and can be used to switch larger currents on and off in various electronic circuits.

Silicon PNP transistors offer advantages such as high gain, low noise, and good thermal stability. They are widely used in many applications, including audio amplifiers, power supplies, voltage regulators, and digital logic circuits.

Features

1. Low Collector Saturation Voltage.

2. Large Current

3. High Total power dissipation : Pt = 1.3 W

4. Complementary to 2SD1691

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = – 60 V

2. Collector to Emitter Voltage: Vceo = – 60 V

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

4. Collector Current: Ic = – 5 A

5. Collector Dissipation : Pc = 1.3 W

6. Junction Temperature: Tj = 150°C

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

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B1151 PDF Datasheet