The 2SA2161J is a PNP silicon epitaxial planar transistor manufactured by Panasonic. This transistor is designed for low-noise amplifier applications, particularly in audio equipment. The 'J' in the part number typically indicates a specific gain ranking within the production batch.

Applications

• Audio preamplifiers: Used in the initial amplification stages of audio systems to amplify weak signals with minimal added noise.
• Microphone amplifiers: Employed to boost the signal from microphones in recording and communication devices.
• Line amplifiers: Utilized to increase the signal level for transmission over longer distances in audio distribution systems.
• Equalizers: Implemented in audio equalizers to adjust the frequency response of audio signals.

Features

• PNP silicon epitaxial planar transistor.
• Low noise figure.
• High current gain (hFE).
• Low distortion.
• Excellent frequency response.

Benefits

• Provides high-quality audio amplification with minimal noise.
• Ensures accurate signal reproduction with low distortion.
• Offers stable performance across a range of frequencies.
• Suitable for applications demanding high signal fidelity.

Technical Specifications (Typical)

• Collector-Base Voltage (VCBO): -60V
• Collector-Emitter Voltage (VCEO): -50V
• Emitter-Base Voltage (VEBO): -5V
• Collector Current (IC): -50mA
• Collector Power Dissipation (PC): 200mW
• Current Gain (hFE): Varies depending on the 'J' ranking, typically between 200 and 400.
• Transition Frequency (fT): 100 MHz
• Operating Junction Temperature: 150°C

The 2SA2161J is an excellent choice for audio applications where low noise is critical. Its specifications make it well-suited for use in high-fidelity audio preamplifiers and microphone amplifiers. The gain ranking ('J') ensures consistent performance across devices. The transistor's low distortion characteristics contribute to clean and accurate audio reproduction. Its reliability and well-defined specifications make it a popular choice for audio engineers and electronic designers.