SONY 2SD291 Transistor TO-66

( Brand: Sony ), ( Manufacturer Part Number: 2SD291 ), ( Type: Transistor )

Review SONY D291 Original Output Transistor Tested

The Sony SOD291D291 transistor is a small signal NPN type component, designed for use in various electronic circuits. This transistor comes in a TO-66 package, which is a flat, circular, radial leaded package with a tab for easy identification and handling. The TO-66 package allows for efficient heat dissipation, making it suitable for applications where the transistor may be operating at higher power levels.

The Sony SOD291D291 transistor has a nominal collector-emitter voltage (VCE) of 6.6 volts and a maximum collector current (IC) of 1.3 amperes. It also offers a maximum power dissipation of 5 watts. These specifications make it a versatile component for use in a wide range of low to moderate power electronic circuits, such as amplifier stages, switches, and logic gates.

The transistor's maximum junction temperature is 125 degrees Celsius, ensuring reliable operation even in high temperature environments. It also features a low noise figure (NF) of 0.55 dB at room temperature, making it an excellent choice for applications where low noise is a priority, such as radio frequency (RF) circuits.

The Sony SOD291D291 transistor also offers a high beta (hfe) of approximately 100, which is the current gain of the transistor. This high beta value means that a small input current can control a larger output current, making it an efficient and effective means of amplification.

In summary, the Sony SOD291D291 transistor is a versatile and high-performing small signal NPN component, suitable for a wide range of low to moderate power electronic applications. Its TO-66 package allows for efficient heat dissipation, while its low noise figure, high current gain, and high power dissipation make it an excellent choice for applications where low noise and efficient amplification are key requirements.

The Sony TO-66 transistor model number SBD291 is a popular choice for various electronic projects due to its high gain and low noise characteristics. However, like any other electronic component, it comes with its own set of advantages and disadvantages.

1. High gain: The SBD291 transistor has a high current gain of approximately 200, making it suitable for amplifier circuits where a large current amplification is required.

2. Low noise: This transistor has a low noise figure, making it an ideal choice for applications where low noise is essential, such as radio receivers and audio amplifiers.

3. Widely available: The Sony SBD291 transistor is a commonly used component, and it is readily available from various electronics suppliers, making it easy to obtain.

1. Limited power handling: The SBD291 transistor has a relatively low power handling capacity, with a maximum collector-emitter voltage of 40V and a maximum collector current of 500mA. This limits its use in high-power applications.

2. Requires careful handling: Transistors, including the SBD291, are sensitive components that require careful handling during installation and use. They can be damaged by excessive heat, voltage, or current.

3. Limited frequency response: The SBD291 transistor has a relatively low frequency response, making it less suitable for applications that require high-frequency amplification, such as radio transmitters or oscillators.

The Sony SBD291 TO-66 transistor is a versatile and widely used component in various electronic applications due to its high gain and low noise characteristics. However, it has its limitations, such as limited power handling capacity, sensitivity to handling, and limited frequency response. Therefore, it is essential to consider the specific requirements of your application before deciding to use this transistor.

If you require a transistor with high gain and low noise characteristics for a low to medium power application, the Sony SBD291 TO-66 transistor could be an excellent choice. However, if you need a transistor with higher power handling capacity, wider frequency response, or more robust construction, you may need to consider other options. It is always recommended to consult the specifications and datasheets of various transistors to determine which one best fits your application requirements.

Details:

Sony D291 V76, qty 4 transistors. Includes mounting hardware.

part #: 2sd291 prices

• $13.95-$29.50

specifications partsvintageaudio:

• brand: Sony
• mpn: 2sd291
• type: Transistor

returns partsvintageaudio:

• policy: No Returns

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seller partsvintageaudio:

• rating: 100.0%
• city: Cary, Illinois
• # reviews: 438

offer partsvintageaudio:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: August 3, 2025
• quantity: 1

shipping partsvintageaudio:

• cost: $4.41
• carrier: USPS
• class: Standard
• type: Calculated
• transit: 4-8 Days
• service: USPS Ground Advantage

general partsvintageaudio:

• condition: Used
• Vintage Audio Video > Vintage Parts Accessories > Other Vintage A/V Parts Accs

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