Description

The 3M9 Ohm (3.9M) 1/2W 5% Through Hole Resistor is a high-value resistor commonly used in electronic circuits where high resistance is necessary for controlling current, voltage division, or filtering signals. With a nominal resistance of 3.9M ohms (3,900,000 ohms), a 1/2 watt (0.5W) power rating, and a 5% tolerance, this resistor is designed for moderate power applications. The through-hole mounting ensures secure attachment to printed circuit boards (PCBs), making it suitable for both prototyping and production applications.

Key Specifications:

• Resistance: 3.9M ohms (3,900,000 ohms)

  • The 3.9M ohm resistor is used when high resistance is required in a circuit to limit current, divide voltages, or stabilize signals. It is commonly found in voltage dividers, sensor circuits, and high-impedance applications.

• Power Rating: 1/2 watt (0.5W)

  • This resistor can safely dissipate 0.5 watts of electrical power without causing excessive heating. It is ideal for moderate power applications that do not generate high heat.

• Tolerance: ±5%

  • The 5% tolerance means that the actual resistance can vary by 5% from the nominal value. For the 3.9M ohm resistor, this means the actual resistance could range from 3,705,000 ohms to 4,095,000 ohms.

• Mounting Type: Through-hole

  • The through-hole mounting design features metal leads that are inserted through holes on a PCB and soldered to create a secure electrical connection. This type of resistor is ideal for both prototyping and large-scale production.

Applications:

• Current Limiting:
  The 3.9M ohm resistor is used in circuits to limit current, helping to protect sensitive components such as LEDs, transistors, or microcontrollers from excessive current that could cause damage.

• Voltage Regulation:
  This resistor is used in voltage regulation circuits, where it helps maintain stable voltage levels and prevents dangerous voltage spikes that could harm components in the system.

• Voltage Divider Circuits:
  The 3.9M ohm resistor is commonly used in voltage divider circuits to reduce high voltages to lower, safe levels. It is often paired with other resistors to achieve a desired output voltage that can be safely read by sensors, ADCs (analog-to-digital converters), and other components.

• Signal Processing and Filtering:
  The 3.9M ohm resistor is useful in signal processing and filtering applications, such as noise filtering, analog signal conditioning, and audio processing. It helps stabilize and clean electrical signals in a variety of systems, including audio, RF (radio frequency), and other analog applications.

Physical Characteristics:

• Size:
  The 1/2 watt resistor typically measures around 1/4 inch (6.35 mm) in length and 1/8 inch (3.18 mm) in diameter. Exact dimensions may vary slightly depending on the manufacturer.

• Construction:
  The resistor is made with a cylindrical body and metal leads extending from both ends. These leads pass through holes in the PCB and are soldered to ensure a stable electrical connection.

Summary:
The 3M9 Ohm (3.9M) 1/2W 5% Through Hole Resistor is a reliable and versatile component used in various electronic circuits requiring high resistance values. With a 3.9M ohm resistance, 1/2 watt power rating, and 5% tolerance, it is perfect for use in current limiting, voltage regulation, voltage divider circuits, and signal processing. The through-hole mounting design ensures secure attachment to PCBs, making it suitable for both prototyping and large-scale manufacturing. This resistor provides consistent and stable performance, ensuring the safe and efficient operation of a wide range of electronic applications.