The 2SA733-A/JD is a silicon PNP epitaxial transistor manufactured by NEC. It is a low-noise amplifier transistor designed for high-gain, low-noise applications, and general-purpose switching. The "-A" designates a specific gain rank, while the "/JD" likely indicates a further refined manufacturing variation or lot code. Key features include excellent low-noise performance and high current amplification.

Applications

• Low-noise audio amplifiers
• High-gain amplifier stages
• General-purpose switching circuits
• Input stages of sensitive receivers

Features

• PNP Silicon Epitaxial Transistor
• Low Noise Figure
• High Current Gain (hFE), specifically the A rank
• Low Collector-Emitter Saturation Voltage

Benefits

• Exceptional Audio Quality: The low noise figure ensures minimal added noise in the amplifier circuit, resulting in cleaner audio reproduction.
• Efficient Signal Amplification: High current gain facilitates the amplification of weak signals with minimal input current.
• Reduced Power Dissipation: Low saturation voltage reduces power losses during switching operations.
• Broad Applicability: Suitable for a variety of low-power amplification and switching tasks.

Technical Specifications

The 2SA733-A/JD typically features a collector-emitter voltage (VCEO) of -50V, a collector current (IC) of -0.15A, and a collector power dissipation (PC) of 0.25W. The DC current gain (hFE), specifically for the 'A' rank, usually falls within a specific tighter range (consult datasheet). The noise figure (NF) is typically around 4dB. It is commonly available in a TO-92 package. Always consult the specific datasheet for the exact parameters and gain range associated with the 'A' and '/JD' designations.