2.2M Ohms (1/4 Watt) Resistor

Introduction

The 2.2M Ohms (1/4 Watt) resistor is a high-resistance electronic component designed for circuits requiring minimal current flow and precise control over voltage levels. With a resistance value of 2,200,000 Ohms, this resistor is commonly used in sensor circuits, high-impedance applications, voltage dividers, and other specialized electronic systems.

Key Specifications

• Resistance Value: 2,200,000 Ohms (2.2M Ohms)
• Power Rating: 1/4 Watt (250 mW)
• Tolerance: Typically ±5%, with variations available up to ±1% for high-precision applications
• Temperature Coefficient: ±100 to ±200 ppm/°C, ensuring minimal resistance change due to temperature fluctuations

Construction and Design

The 2.2M Ohms resistor is typically constructed using either carbon film, metal film, or metal oxide material, depending on the desired accuracy and durability. The standard color code is used to represent the resistance value and tolerance, making it easy to identify on a circuit board. It is designed with axial leads for through-hole mounting, allowing it to be easily installed on breadboards or PCBs.

Applications

Due to its high resistance, the 2.2M Ohms resistor is suitable for a range of specific applications:

• High Impedance Circuits: Commonly found in circuits where very low current is required, such as signal processing and sensor interfacing.
• Voltage Dividers: Utilized in voltage divider circuits to reduce voltage levels for input into sensitive electronic components.
• Current Limiting: Helps to limit current flow in high-voltage or low-current systems, protecting sensitive components.
• RC (Resistor-Capacitor) Timing Circuits: Used in conjunction with capacitors to set time constants in timing and filter circuits.
• Leakage Current Control: Ideal for controlling leakage currents in high-precision or high-voltage applications, such as in power supplies and signal conditioning systems.

Advantages

• High Accuracy: Available in low-tolerance versions, such as ±1%, the 2.2M Ohms resistor provides precise resistance for critical applications.
• Thermal Stability: Its low temperature coefficient ensures stable resistance across varying temperatures, making it reliable in fluctuating environments.
• Durable Design: Made from high-quality materials, this resistor offers long-term reliability and can withstand stress in demanding conditions.
• Versatility: Its high resistance value makes it suitable for various applications, including voltage division, current limiting, and RC circuit design.

Common Applications

• Amplifiers and Filters: In high-impedance amplifiers, this resistor helps maintain proper biasing and feedback conditions, ensuring consistent performance in audio, signal, and RF circuits.
• Sensor Circuits: Ideal for interfacing with high-impedance sensors, the 2.2M Ohms resistor ensures low current draw and proper signal conditioning for components like thermistors, photodiodes, and capacitive sensors.
• RC Timing and Filtering: Used in conjunction with capacitors in RC circuits to create precise time delays, filtering frequencies, or setting oscillation periods in timers and oscillators.
• Electrostatic Discharge (ESD) Protection: This resistor can provide high resistance in circuits designed to prevent electrostatic discharge, safeguarding sensitive electronic components from damage.
• Voltage Sensing: Frequently used in voltage divider networks to scale down high voltage levels for measurement or processing by microcontrollers and other low-voltage devices.

Conclusion

The 2.2M Ohms (1/4 Watt) resistor is a vital component in applications requiring high resistance and precise control over current and voltage. Its versatility, stability, and durability make it an excellent choice for high-impedance circuits, voltage dividers, RC timing circuits, and sensor applications. Whether used in professional electronics, industrial systems, or educational projects, the 2.2M Ohms resistor is essential for creating reliable and precise electronic designs.

Ceramic Capacitor 2.2PF (Pack of 5)