Part Number: B737, 2SB737
Funtion: -40V, -300mA, Low rbb Low Noise Amp
Package: TO-92 Type
Manufacturer: Rohm
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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
