Description

The 1E2 Ohm (1.2E) 1/4W 5% Through Hole Resistor is a specific type of resistor used in electronic circuits. Here's a breakdown of its description and key features:

1. Resistance Value (1E2 or 120 Ohms):

• The 1E2 refers to the 120 ohms resistance value. This means the resistor provides 120 ohms of opposition to the flow of electric current in a circuit. The notation 1E2 is a shorthand for 120 ohms, often seen in component markings based on the E-series of standard values.
• This resistor would typically be used in circuits where you want to limit current flow or create voltage drops. A resistance of 120 ohms is a medium value, suitable for applications where moderate current regulation is needed.

2. Power Rating (1/4W or 0.25W):

• The 1/4 watt (0.25W) power rating indicates that the resistor can safely dissipate up to 0.25 watts of electrical power as heat without risking damage. This is suitable for low-power circuits, where the resistor won't be subjected to high currents or voltages that would generate excessive heat.

3. Tolerance (5%):

• The 5% tolerance means the actual resistance can vary by ±5% from the nominal value of 120 ohms. This means the resistor could actually have a resistance anywhere between 114 ohms and 126 ohms.
• The 5% tolerance is typical for general-purpose resistors and is acceptable in most standard electronic applications, where high precision is not critical.

4. Through-Hole Mounting:

• The through-hole design refers to the resistor having leads (metal pins) that pass through holes in a printed circuit board (PCB) and are soldered on the other side. This mounting type is commonly used in circuits where components need to be physically secure, especially in larger or more robust designs. It also allows for easier handling during assembly and repair.

5. Material and Construction:

• This type of resistor is likely constructed from carbon film or metal oxide. Carbon film resistors are widely used for general-purpose applications because they are affordable and reliable, while metal oxide resistors offer better stability and higher heat tolerance.
• Resistors of this type typically have a stable temperature coefficient, meaning their resistance value remains relatively constant with changes in temperature, ensuring consistent performance in different operating conditions.

Applications:

• Current Limiting: This resistor is commonly used in circuits that require current limiting, such as in LED circuits, power supplies, and protection circuits.
• Voltage Division: It could also be part of a voltage divider network, where two resistors work together to produce a specific output voltage from a higher input voltage.
• Filtering and Signal Processing: This resistor could be used in low-pass or high-pass filters, where it helps control the frequency response in signal processing applications.
• Pull-down or Pull-up Resistor: In digital logic circuits, resistors like this are often used as pull-down or pull-up resistors, ensuring that inputs are at defined logic levels when not actively driven by other components.

Summary:

The 1E2 Ohm (120 Ohms) 1/4W 5% Through Hole Resistor is a versatile, general-purpose component suitable for a variety of electronic applications. It has a resistance value of 120 ohms, a power rating of 1/4 watt, and a 5% tolerance. Its through-hole design makes it easy to use in traditional PCB designs, and its typical applications include current limiting, voltage division, and signal processing tasks.