B1237 PDF Datasheet – 32V, 1A, PNP Transistor – 2SB1237

This post explains for the PNP Transistor.

The Part Number is B1237, 2SB1237.

The function of this semiconductor is -32V, -1A, PNP Transistor.

Manufacturer: Rohm

Preview images :B1237 pinout datasheet


The B1237 is Medium Power Transistor ( -32V, -1A).

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.



1) Low VCE(sat). VCE(sat) = *0.2V (Typ.) (IC / IB = –500mA / –50mA)

2) Compliments 2SD1664 / 2SD1858.

Structure Epitaxial planar type PNP silicon transistor


B1237 pdf

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = – 40V

2. Collector to Emitter Voltage: Vceo = – 32V

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

4. Collector Current: Ic = -1 A

5. Collector Dissipation : Pc = 1 W

6. Junction Temperature: Tj = 150°C

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

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B1237 PDF Datasheet