Datasheet Archives - Page 21 of 6974

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 (r_bb’ ≈ 2Ω)
Excellent noise response at low source resistance (R_g)
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	V_CBO	-50	V
Collector-Emitter Voltage	V_CEO	-40	V
Emitter-Base Voltage	V_EBO	-5	V
Collector Current	I_C	-300	mA
Collector Power Dissipation	P_C	0.25	W
Junction Temperature	T_j	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

The NEMA23 is a 2-phase hybrid stepper motor designed for precision motion control, featuring a 1.8° step angle and a robust mechanical structure in a 3.1-inch motor body.

Pacakge: 2.3 x 2.3 inch (58.4 x 58.5 mm)

Manufacturer: Schneider Electric

This post explains for the Stepper Motor NEMA 23.

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NEMA 23 datasheet

Description

Nema 23 is a stepper motor with a 2.3 x 2.3 inch faceplate. It is suitable for 3d printer, robot arm, cnc machine,etc. In low-speed applications, the stepper motor can be driven at the desired speed without missing a single step. It delivers high holding torque with stable current characteristics, making it well-suited for applications requiring accurate positioning and repeatability. This motor is commonly deployed in CNC systems, additive manufacturing equipment, and automated industrial machinery.

This stepper motor has different torque, the max torque is 3 Nm. We provide nema 23 stepper motor datasheet and torque curve. The torque is different for each operating speed, but decreases as the stepping speed increases. The reason is the operating principle of the stepper motor. The drive signal of the stepper motor generates a magnetic field in the coil of the motor to generate a step force. The time it takes for the magnetic field to reach its maximum intensity depends on the inductance of the coil, the drive voltage and current limit. As the drive speed increases, the coil maintains its full strength for a shorter period of time and the torque that the motor can produce decreases.