Introduction
The pure green color 1.8mm / 2mm round top LED is a vibrant and versatile component. This size LED is commonly utilized in a wide array of custom projects, including automotive lighting, scale models, and various electronic applications. Its compact size, brightness, ease of use, and versatility make it an extremely popular choice for both custom builds and mass production products. These LEDs are designed to fit into most spaces, offering broad applicability.
Figure 1: 1.8mm / 2mm Round Top Pure Green LED. This image displays the physical appearance of the LED, highlighting its small form factor and the vibrant green light it emits.
Key Features
- Size: 1.8mm / 2mm Round Top Clear lens, compact for various applications.
- Color: Pure Green, providing a distinct and bright illumination.
- Luminosity: High brightness ranging from 8,000 to 9,000 mcd (millicandela).
- Forward Voltage: Operates within a range of 3.0-3.4V.
- Current: Standard operating current of 20mA.
- Wavelength: Emits light at 515-525nm, characteristic of pure green.
- Viewing Angle: Provides a focused light with a 20-30 degree viewing angle.
- Mount Style: Through Hole (DIP) for easy integration into circuit boards.
- Versatility: Suitable for mods, RC projects, Arduino, automotive, HO Scale models, and various DIY electronics.
Setup and Electrical Connection
Proper electrical connection is crucial for the longevity and performance of your LEDs. LEDs are diodes, meaning they allow current to flow in only one direction. Incorrect polarity or excessive current can damage the LED.
Understanding LED Polarity
Each LED has two leads: an anode (+) and a cathode (-). For through-hole LEDs, the longer lead is typically the anode (+), and the shorter lead is the cathode (-). The cathode side may also have a flat edge on the LED's plastic casing.
Figure 2: LED Dimensions and Polarity. This diagram illustrates the physical dimensions of the LED and clearly marks the anode (positive) and cathode (negative) leads, which is essential for correct wiring.
Resistor Selection
LEDs require a current-limiting resistor in series to prevent damage from excessive current. The appropriate resistor value depends on your supply voltage and the LED's forward voltage and current. The table below provides quick selection guidelines for 3V 20mA LEDs.
Figure 3: Resistor Selection Table and Basic Circuit. This image provides a practical guide for selecting the correct resistor for various supply voltages and illustrates a fundamental circuit for connecting an LED with a resistor to a DC supply.
| Supply Voltage | Resistance Rating | Power Rating |
|---|---|---|
| 2V | NA | NA |
| 3V | 1 ohm | 1/4 Watt |
| 4V | 56 ohm | 1/4 Watt |
| 4.5V | 75 ohm | 1/4 Watt |
| 5V | 100 ohm | 1/4 Watt |
| 6V | 150 ohm | 1/4 Watt |
| 7V | 200 ohm | 1/4 Watt |
| 8V | 270 ohm | 1/4 Watt |
| 9V | 300 ohm | 1/4 Watt |
| 10V | 360 ohm | 1/4 Watt |
| 11V | 430 ohm | 1/4 Watt |
| 12V | 470 ohm | 1/4 Watt |
| 13V | 510 ohm | 1/4 Watt |
| 14V | 560 ohm | 1/2 Watt |
| 15V | 620 ohm | 1/2 Watt |
| 16V | 680 ohm | 1/2 Watt |
| 17V | 750 ohm | 1/2 Watt |
| 18V | 750 ohm | 1/2 Watt |
| 19V | 820 ohm | 1/2 Watt |
| 20V | 910 ohm | 1/2 Watt |
| 21V | 910 ohm | 1/2 Watt |
| 22V | 1K (1000) ohm | 1/2 Watt |
| 23V | 1K (1000) ohm | 1/2 Watt |
| 24V | 1.2K (1200) ohm | 1/2 Watt |
*Quick selection guide/table - Use at own risk. For direct LED replacement of same type/size, typically a resistor is not required.
Basic Circuit Diagram
A typical LED circuit involves connecting the LED in series with a current-limiting resistor to a DC power supply. Ensure the anode (+) connects to the positive terminal of the power supply (via the resistor) and the cathode (-) connects to the negative terminal.
Single LED Setup: Connect the anode of the LED to the positive terminal of your DC supply through the calculated resistor. Connect the cathode of the LED to the negative terminal of your DC supply.
Multiple LED Setup: To hook up several LEDs, duplicate the single LED setup for each LED. Then, connect all negative terminals (cathodes) together and separately connect all positive terminals (anodes) together, ensuring each LED has its own series resistor. This parallel configuration ensures each LED receives its optimal current.
Operating Guidelines
- Voltage and Current: Always operate the LEDs within their specified forward voltage (3.0-3.4V) and current (20mA) limits. Using a current-limiting resistor is essential.
- Temperature: While LEDs are generally robust, extreme temperatures can affect their performance and lifespan. Operate them within reasonable ambient temperature ranges.
- Static Electricity: LEDs are sensitive to electrostatic discharge (ESD). Handle them with care, preferably using anti-static precautions, especially during installation.
Maintenance and Care
- Cleaning: If necessary, gently clean the LED lens with a soft, lint-free cloth. Avoid abrasive materials or harsh chemicals.
- Storage: Store unused LEDs in a dry, cool environment, ideally in their original packaging or anti-static bags, to protect them from dust, moisture, and static discharge.
- Physical Handling: Avoid bending the leads too close to the LED body or applying excessive force, as this can damage the internal connections.
Troubleshooting
- LED Not Lighting Up:
- Check polarity: Ensure the anode (+) is connected to the positive supply and the cathode (-) to the negative supply.
- Verify power supply: Confirm the power supply is providing the correct voltage and is active.
- Inspect resistor: Ensure the correct resistor value is used and it is properly connected. A shorted or open resistor will prevent the LED from lighting.
- Check connections: Look for loose wires or poor solder joints.
- Test LED: If possible, test the LED with a known good power source and resistor to rule out a faulty component.
- LED Too Dim or Too Bright:
- Resistor value: An incorrect resistor value is the most common cause. A resistor that is too high will make the LED dim; too low will make it too bright and potentially damage it. Refer to the resistor selection table.
- Supply voltage: Ensure the supply voltage matches the design requirements.
- LED Flickering:
- Unstable power supply: Use a stable DC power source.
- Loose connections: Re-check all wiring and solder joints.
Technical Specifications
| Attribute | Value |
|---|---|
| Model Number | 1.8MMROUNDTOPLEDGREENPURE |
| ASIN | B017TRAJUW |
| Manufacturer | Lighthouse LEDs |
| Date First Available | November 10, 2015 |
| Size | 1.8mm / 2mm Round Top Clear |
| Color | Pure Green |
| Luminosity | 8,000-9,000 mcd |
| Forward Voltage | 3.0-3.4V |
| Current | 20mA |
| Wavelength | 515-525nm |
| Viewing Angle | 20-30 Degrees |
| Mount Style | Through Hole (DIP) |
| Lens Color | Clear |
Warranty and Support
For any questions regarding the 1.8mm / 2mm Round Top Pure Green LEDs, or for technical assistance, please contact Lighthouse LEDs directly. Information regarding specific warranty terms may be available through your point of purchase or on the manufacturer's official website. Always refer to the manufacturer's guidelines for the most accurate and up-to-date support information.
Note: The buybox winner information indicates a 30-day return policy for this product. Please check with your retailer for specific return and warranty details.
