B688 PDF Datasheet – 120V, 8A, PNP Transistor – 2SB688

This post explains for the PNP transistor.

The Part Number is 2SB688.

The function of this semiconductor is – 120V, – 8A, Silicon PNP Transistor.

The package is TO-3P(I).

Manufacturer: Savantic

Preview images :B688 pdf pinout


B688 is – 120V, – 8A, Silicon PNP Power Transistor.

A PNP transistor is one of the semiconductor components used in electrical engineering and electronic circuit design, belonging to the Bipolar Junction Transistor (BJT) family. The PNP transistor consists of three layers of semiconductor material: P-type, N-type, and P-type, each with different charges. The name PNP transistor stands for “Positive-Negative-Positive,” reflecting the characteristics of these three semiconductor layers.

PNP transistors comprise the following key components:

1. Emitter: The emitter is the first layer and is made of P-type semiconductor material. The emitter serves as the primary source of current.

2. Base: The base is the second layer and is made of N-type semiconductor material. The base controls the current between the emitter and collector.

3. Collector: The collector is the third layer and is made of P-type semiconductor material. The collector collects the current, which flows from the emitter through the base.

PNP transistors control the flow of a large current (collector current) between the emitter and collector using a small current applied to the base (base current). When a base current flows, the PNP transistor permits the flow of electrons from the emitter to the collector, resulting in an increase in collector current. Reducing the base current reduces the collector current. Consequently, PNP transistors are valuable electronic components for controlling large output currents with small input currents.


B688 Features :

1. With TO-3P(I) package

2. Complement to type 2SD718


B688 datasheet transistor

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = – 120 V

2. Collector to Emitter Voltage: Vceo = – 120 V

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

4. Collector Current: Ic = – 8A

5. Total Dissipation : Pc =80 W

6. Junction Temperature: Tj = 150°C

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



1. Power amplifier applications

2. Recommend for 45~50W audio frequency amplifier output stage

B688 PDF Datasheet

B688 pdf

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