1N647 TEXAS INSTRUMENTS Transistor

Review TEXAS INSTRUMENTS Lot Of Vintage Electronic Part Ti Transistor

The Texas Instruments NPN bipolar transistor Type 1N647 is a versatile and widely used component in electronic circuits. This transistor is designed for general-purpose applications and can be used as an amplifier, switch, or oscillator.

The 1N647 transistor has a nominal collector-emitter voltage (Vce) of 7 volts and a maximum collector-emitter voltage of 40 volts. It can handle a continuous collector current of up to 250 milliamperes (mA) and a peak collector current of 500 mA. The maximum power dissipation is 1 watt.

The base-emitter junction of this transistor has a nominal voltage drop of 0.65 volts and a maximum current gain (hfe) of approximately 150. The hfe value indicates the number of current amplification the transistor provides.

The 1N647 transistor is encapsulated in a TO-126 flat pack case, which allows for easy mounting on a printed circuit board. The case has three leads: the collector, the base, and the emitter. The collector lead is the longest and is usually connected to the positive voltage supply in a circuit. The base lead is usually connected to the control input or signal source, and the emitter lead is connected to the ground or negative voltage supply.

This transistor has a temperature coefficient of beta (hfe) of -2% per degree Celsius. It also has a low noise figure, making it suitable for use in audio applications. The 1N647 transistor has a maximum operating temperature of 125 degrees Celsius and a storage temperature range of -55 to 125 degrees Celsius.

The Texas Instruments 1N647 transistor is a reliable and cost-effective solution for a wide range of electronic projects. It offers good current handling capacity, voltage gain, and low noise, making it a popular choice for amplifier, switch, and oscillator circuits.

The Texas Instruments NPN bipolar transistor type 1N647 is a commonly used component in various electronic circuits due to its versatility and reliability. Below are some pros and cons that can help in deciding whether to purchase this transistor:

1. Widely Available: The 1N647 is a popular transistor, making it easily accessible from various electronics retailers and distributors.

2. General Purpose: This transistor can be used for various applications, including amplification, switching, and voltage regulation.

3. Low Input Impedance: The 1N647 has a low input impedance, enabling it to drive low-impedance loads effectively.

4. High Current Capability: This transistor can handle relatively high currents, making it suitable for power applications.

1. Limited Frequency Response: The 1N647 is not designed for high-frequency applications, with a maximum frequency of around 100 MHz.

2. Temperature Dependent: The transistor's electrical characteristics can change with temperature, requiring careful consideration during circuit design.

3. Requires Proper Biasing: Proper biasing is essential to ensure the transistor operates correctly in a circuit.

In conclusion, the Texas Instruments 1N647 transistor offers a good balance between versatility, availability, and power handling capabilities. However, its limited frequency response and temperature sensitivity are important considerations. Ultimately, the decision to purchase this transistor depends on the specific requirements of the intended application. If the design calls for low-frequency operation and reasonable power handling, the 1N647 is an excellent choice. If high-frequency operation is required, alternative transistors with better frequency response should be considered.

Details:

These transistors are from the vintage era, making them a collectible item for those interested in electronics. Has not been tested. Please see photos for full. Appears to be in excellent condition.

Still in original package. The ti brand is well-known for producing high-quality electronic components, and these transistors are likely to be sought after by vintage calculator enthusiasts looking repair or restore older devices.

specifications vintcalc:

• brand: Texas Instruments
• mpn: 1n647
• model: Ti Texas 1n647
• vintage: Yes

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• started: july 30, 2025