What is 2SB861?

This is a PNP bipolar junction transistor (BJT) designed for general-purpose amplifier and switching applications.

Part Number: 2SB861

Function: -150V, -2A, Silicon Power PNP Tranistor

Package: TO-220AB Type

Manufacturer: Hitachi,  Renesas Electronics

Image and Pinouts:

This transistor has three pins: emitter, base, and collector.

Description

The 2SB861 is Silicon PNP Triple Diffused Transistor. It is commonly used in audio amplifier circuits, voltage regulators, and switching circuits. It can also be used in other general-purpose applications where a PNP transistor is required.

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.

 

Advantages Vs Disadvantages

Advantages:

1. High voltage and current handling capabilities

2. Low saturation voltage, which reduces power dissipation and improves efficiency in switching applications

Disadvantages:

1. Limited maximum current rating, which makes it unsuitable for high power applications

2. Relatively low maximum frequency rating, which makes it unsuitable for high-speed applications

3. Limited gain bandwidth product, which limits its use in high-frequency amplification circuits

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = -200 V
2. Collector to Emitter Voltage: Vceo = -150 V
3. Emitter to Base Voltage: Vebo = -6 V
4. Collector Current: Ic = -2 A
5. Total Dissipation : Pc =1.8 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C

Applications:

1. Low frequency power amplifier color TV vertical deflection output complementary pair with 2SD1138

Related Posts

• B1375 PNP Transistor
• 2SB861 Datasheet
• B1237
• 2SB1642
• 2SB772

Other data sheets are available within the file: B861

2SB861 Datasheet PDF Download

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Part Number: A2098, 2SA2098

Function: – 50V, – 15A,  PNP Transistor

Package: TO-220ML Type

Manufacturer: Sanyo

Images:

 

Description

The A2098 is PNP Epitaxial Planar Silicon 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.

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.

Biasing: PNP transistors are biased in the opposite direction to NPN transistors. To turn on a PNP transistor, the base must be more negative than the emitter, and to turn it off, the base must be more positive than the emitter.

Features

1. Adoption of MBIT processes.

2. Large current capacitance.

3. Low collector-to-emitter saturation voltage.

4. High-speed switching

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = – 50 V

2. Collector to Emitter Voltage: Vceo = – 50 V

3. Emitter to Base Voltage: Vebo = – 6 V

4. Collector Current: Ic = – 15 A

5. Collector Dissipation : Pc = 2 W

6. Junction Temperature: Tj = 150°C

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

Applications:

1. High-Current Switching

2. Relay drivers, lamp drivers, motor drivers

 

A2098 PDF Datasheet