PNP

A1273 PDF – PNP Transistor, -30V, -2A – 2SA1273

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Part Number: 2SA1273

Function: -30V, -2A, Silicon PNP Transistor

Package: TO-92 Type

Manufacturer: BLUE ROCKET ELECTRONICS

Images:

A1273 pinout datasheet

Description

A1273 is -30V, -2A, Silicon PNP Transistor. This is a medium-power PNP bipolar junction transistor (BJT) designed for switching and amplification applications

Features

1. Complementary to KTC3205

2. Good thermal stability

3. High reliability for general-purpose use

4. Suitable for switching and linear amplification

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = – 30 V

2. Collector to Emitter Voltage: Vceo = – 30 V

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

4. Collector Current: Ic = – 2 A

5. Collector Dissipation: Pc = 1 W

6. Junction Temperature: Tj = 150°C

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

A1273 pdf transistor

Applications

1. Consumer electronics

2. Audio systems

3. Control circuits

4. Power driver stages

5. Embedded systems

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A1273 PDF Datasheet

B737 Datasheet – 40V, 300mA, PNP Transistor – Rohm

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Part Number: B737, 2SB737

Funtion: -40V, -300mA, Low rbb Low Noise Amp

Package: TO-92 Type

Manufacturer: Rohm

Image

B737 datasheet

Description

B737 is a low-noise PNP bipolar junction transistor from Rohm, housed in a TO-92 package and rated for up to -40V and -300mA operation. It features ultra-low noise characteristics, low base resistance, and excellent noise response, making it suitable for sensitive analog signal applications. This transistor is commonly used in low-noise amplifiers, audio circuits, and precision signal processing stages.

Features

  • PNP bipolar transistor with -40V voltage rating
  • Low noise performance optimized for audio and signal applications
  • Ultra-low base resistance (rbb’ ≈ 2Ω)
  • Excellent noise response at low source resistance (Rg)
  • Low voltage noise characteristics
  • Complementary pair with 2SD786 (NPN)
  • TO-92 through-hole package

Absolute Maximum Ratings (Tc = 25 °C)

Parameter Symbol Value Unit
Collector-Base Voltage VCBO -50 V
Collector-Emitter Voltage VCEO -40 V
Emitter-Base Voltage VEBO -5 V
Collector Current IC -300 mA
Collector Power Dissipation PC 0.25 W
Junction Temperature Tj 125 °C

Design Notes

  • Ideal for low-noise amplifier stages where base resistance and noise figure are critical
  • Maintain low source impedance to fully benefit from low-noise characteristics
  • Ensure proper biasing to operate in the linear region for analog applications
  • Thermal limits should be considered due to relatively low power dissipation rating
  • Pair with 2SD786 for complementary push-pull amplifier designs

Typical Circuit Usage

  • Low-noise audio preamplifiers
  • Small-signal amplification stages
  • Differential amplifier input stages
  • Sensor signal conditioning circuits

How to Choose This Part

  • Select for applications requiring low noise and stable gain characteristics
  • Suitable for low-current analog signal amplification
  • Choose when complementary pairing with NPN transistor is needed
  • Verify voltage and current ratings match application requirements

Applications

  • Audio amplification systems
  • Precision analog circuits
  • Measurement and instrumentation equipment
  • Low-noise signal processing systems

Alternative / Equivalent Products

  • 2SA1015
  • BC560
  • 2SA970
  • 2SD786 (complementary NPN)

B737 Datasheet