Through hole LED
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Description:
8mm Bi-Color Cylindrical LED, 2-Pin Flat Top: Compact Dual-Color Indicator for Precision Electronics
Introduction
The 8mm bi-color cylindrical LED with a 2-pin flat-top design is a compact, efficient, and visually clear indicator solution engineered for modern electronics. This LED integrates two different color chips—commonly red and green—into a single 8mm LED package, enabling dual-color illumination through polarity reversal. Its flat-top cylindrical lens allows excellent light dispersion, uniform brightness, and smooth color blending.
The LED 8mm bi-color provides a versatile solution for engineers and product designers who require dual-status indication without expanding circuit complexity. Whether used in control panels, instrument clusters, or consumer devices, this bi-color cylindrical LED offers high reliability, low power consumption, and exceptional optical performance.
Key Features of the 8mm Bi-Color Cylindrical LED (2-Pin Flat Top)
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Dual-Color Emission in One Package
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Combines two LED chips in a single encapsulation. Reversing polarity switches between colors (e.g., red and green), while forward/reverse current allows dynamic display control.
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2-Pin Compact Design
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Simplifies circuit design by integrating dual-color output through only two leads, reducing soldering points and saving PCB space.
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Flat-Top Lens for Wide Viewing Angle
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The flat top surface diffuses light evenly across a broader area compared to domed LEDs, improving readability from multiple angles.
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Cylindrical 8mm Package
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The 8mm cylindrical LED housing ensures durability and easy fitting into standard panel mount holes or PCB sockets.
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High Brightness and Uniform Illumination
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The precision-molded lens enhances brightness balance between colors and ensures consistent visual output even under variable voltage conditions.
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ROHS Compliant and Lead-Free
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Environmentally safe design that meets international safety and sustainability standards.
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Long Operating Life
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Rated for over 50,000 hours of operation, making it suitable for industrial-grade reliability.
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Versatile Color Combinations
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Common pairings include red/green, red/yellow, or red/blue, offering adaptable color signaling for different product applications.
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Applications of the 8mm Bi-Color Cylindrical LED
The 8mm bi-color LED is widely used in both industrial and consumer applications where space, energy efficiency, and visual clarity are essential.
1. Industrial Equipment Indicators
This cylindrical LED is ideal for signaling machine status, warnings, or operational modes. A red-green configuration may represent “error” and “normal” states, improving operator efficiency.
2. Consumer Electronics
Used in audio amplifiers, home appliances, and chargers, the LED 8mm bi-color visually communicates power status, charging levels, or standby conditions.
3. Communication Devices
In network routers or transmitters, the flat-top LED provides dual-color feedback for connectivity status—green for active, red for offline or error state.
4. Automotive Applications
Automotive dashboards and control modules benefit from this compact, vibration-resistant 8mm cylindrical LED for signal indicators and system monitoring.
5. Power and Battery Systems
The bi-color 2-pin LED is a compact solution for battery charge indicators, showing red during charging and green upon full charge.
6. Test Instruments and Measurement Devices
Used for status, calibration, and test progress indicators in laboratory and industrial-grade equipment.
Benefits of the 8mm Bi-Color Cylindrical LED
1. Dual Functionality in Compact Form
By integrating two colors into a single LED, designers reduce circuit complexity and component count, achieving efficient space utilization.
2. Simplified Wiring and Control
With only two pins, circuit designers can implement polarity-based color switching without additional control ICs, saving both cost and time.
3. Wide-Angle Illumination
The flat-top cylindrical design provides even light output across a 120–140° viewing range, ensuring visibility from any direction.
4. Energy Efficiency
Consumes minimal power, making it ideal for low-voltage applications or battery-powered devices.
5. High Reliability
Encased in durable epoxy, the LED 8mm bi-color resists shock, vibration, and environmental stress, ensuring long-term performance stability.
6. Design Flexibility
Available in different intensity levels, color combinations, and clear or diffused lens types for tailored visual impact.
7. Cost Efficiency
Combining two LEDs in one housing reduces manufacturing costs, inventory, and assembly time.
Case Studies
Case Study 1 – Industrial Control Panel (USA)
A U.S. automation company adopted 8mm bi-color cylindrical LEDs for their machine interface systems. The red/green dual-color feature allowed quick state recognition—green for operational, red for fault—streamlining troubleshooting and enhancing operator safety.
Case Study 2 – Consumer Audio Equipment (Japan)
A Japanese electronics brand implemented 2-pin flat-top LEDs in their amplifier series. The LED indicated power status using dual colors without additional circuitry, leading to a 25% reduction in PCB complexity.
Case Study 3 – Battery Charging Systems (Germany)
An energy solutions company used the 8mm bi-color cylindrical LED in their lithium battery chargers. The flat-top design provided a uniform glow and maintained visibility even under ambient daylight.
User Testimonials
Peter L., Automation Engineer (UK):
“The 8mm bi-color LED with a flat top has been a game-changer for our indicator modules. Compact, efficient, and extremely bright—it’s everything we need for industrial applications.”
Miyu K., Product Designer (Japan):
“We appreciate the simplicity of the 2-pin design. It reduces assembly time and adds an elegant visual effect to our devices.”
Carlos T., Electronics Technician (Spain):
“The color transition is smooth and perfectly balanced. These LEDs hold up under constant operation without dimming or color drift.”
Integration Tips
To ensure the 8mm bi-color cylindrical LED performs optimally in your application, consider the following:
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Polarity Control – Reverse the polarity to switch colors; a microcontroller or simple polarity circuit can automate transitions.
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Current Limiting Resistors – Always use appropriate resistors to prevent overcurrent and prolong LED lifespan.
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Lens Type Selection – Choose clear lenses for maximum brightness or diffused lenses for softer illumination.
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Mounting Considerations – The 8mm cylindrical form fits most PCB holes; ensure firm alignment for consistent light output.
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Thermal Management – While energy-efficient, ensure ambient temperatures remain below 85°C for optimal performance.
Conclusion
The 8mm bi-color cylindrical LED, 2-pin flat top offers engineers a compact, reliable, and energy-efficient solution for modern signaling needs. Its dual-color capability, flat-top light dispersion, and minimal circuitry make it ideal for industrial panels, automotive indicators, consumer electronics, and communication systems.
With ROHS compliance, long operational life, and flexible polarity-based color switching, the LED 8mm bi-color stands as a preferred choice for designers aiming to combine visual clarity, simplicity, and durability in one powerful lighting component.
Electrical-optical characteristics:
Package configuration & Internal circuit diagram
Obtain 3D specification files
Initial Graphics Exchange Specification (.IGS)Standard for the Exchange of Product Model Data (.STEP)To examine all 3D specifications, save the files to your local drive and open them with your 3D application.
Lens colors in 3D files are solely for visual representation; consult the Datasheet for accurate lens type and color information.
In the event of a mismatch, the dimensions in the datasheet take precedence over the 3D specifications.
All dimensions are in millimeters(inches)
Tolerance is +-0.25(0.01″) unless otherwise note
Specifications are subject to change without notice.
Partno description:
LEDs, Light Emitting diodes, which include various small kinds, such as 3mm, 5mm, 8mm, 10mm; round type, rectangular type square type, tower type, Oval led, elliptical, flat top; SMDs, high power led, piranha LEDs
More Information
Lens Color:
| Code | D | T | C | W | E | |
| Meaning | color Diffused | Color Tinted | Water Clear | Water Diffused | Orange diffused |
Absolute maximum ratings (Ta=25°C)
| Parameter | SR | LR | UR | UE | UY | UG | PG | BG | B | UB | UV | W | Unit |
| Forward Current I F | 25 | 25 | 25 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | mA |
| Power Dissipation P d | 60 | 60 | 60 | 65 | 65 | 75 | 110 | 110 | 120 | 120 | 120 | 120 | mW |
| Reverse Voltage V R | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | V |
| Peak Forward Current I PF (Duty 1/10 @1KHZ) | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 100 | 100 | 100 | 100 | 100 | mA |
| Operation Temperature T OPR | -40 to +80 | °C | |||||||||||
| Storage Temperature T STG | -40 to +85 | °C | |||||||||||
| Lead Soldering Temperature T SOL | Max.260+-5°C for 3 sec Max. (1.6mm from the base of the epoxy bulb) | °C | |||||||||||
Related Information
Applied for:
The LEDs described here are intended to be used for ordinary electronic equipment (such as office equipment,
communication equipment and household applications). Consult Betlux’s Sales in advance for information on
applications in which exceptional reliability is required, particularly when the failure or malfunction of the LEDs
may directly jeopardize life or health (such as in aviation, transportation, traffic control equipment, medical
and life support systems and safety devices).
CAUTIONS for Through-Hole LED Lamps
1. Application
The LEDs described here are intended to be used for ordinary electronic equipment (such as office equipment, communication equipment and household applications). Consult Betlux’s Sales in advance for information on applications in which exceptional reliability is required, particularly when the failure or malfunction of the LEDs may directly jeopardize life or health (such as in aviation, transportation, traffic control equipment, medical and life support systems and safety devices).
2. Storage
The storage ambient for the LEDs should not exceed 30℃ temperature or 70% relative humidity. It is
recommended that LEDs out of their original packaging are used within three months
For extended storage out of their original packaging, it is recommended that the LEDs be stored in a sealed
container with appropriate desiccant or in a desiccator with nitrogen ambient.
3. Cleaning
Use alcohol-based cleaning solvents such as isopropyl alcohol to clean the LED if necessary
4. Lead Forming & Assembly
During lead forming, the leads should be bent at a point at least 3mm from the base of LED lens. Do not use
the base of the leadframe as a fulcrum during forming.
Lead forming must be done before soldering, at normal temperature.
During assembly on PCB, use minimum clinch force possible to avoid excessive mechanical stress.
Soldering
When soldering, leave a minimum of 2mm clearance from the base of the base of the lens to the soldering point. Dipping the lens into the solder must be avoided.
Do not apply any external stress to the lead frame during soldering while the LED is at high temperature.
Recommended soldering conditions:
| IR Reflow Soldering (for SMD display) | Wave Soldering | Soldering Iron | |||
| Pre-Heat | 150-180°C | Pre-Heat | 100°C Max. | Temperature | 300°C Max. |
| Pre-Heat Time | 120sec Max. | Pre-Heat Time | 60sec Max. | ||
| Peak Temperature | 260°C Max. | SolderWave | 260°C Max. | Soldering Time | 3sec Max.(one time only) |
| Soldering Time | 10 sec Max. | Soldering Time | 5sec Max. | ||
Note: Excessive soldering temperature and/or time might result in deformation of the LED lens or failure of the LED
ESD(Electrostatic Discharge)
Static Electricity or power surge will damage the LED.
Suggestions to prevent ESD (Electrostatic Discharge):
n Use a conductive wrist band or anti-electrostatic glove when handling these LEDs
n All devices, equipment, and machinery must be properly grounded
n Work tables, storage racks, etc. should be properly grounded
n Use ion blower to neutralize the static charge which might have built up on surface of the LED’s
plastic lens as a result of friction between LEDs during storage and handling
ESD-damaged LEDs will exhibit abnormal characteristics such as high reverse leakage current,
low forward voltage, or “no light on” at low currents. To verify for ESD damage, check for “light on”
and Vf of the suspect LEDs at low currents.
The Vf of “good” LEDs should be>2.0V@0.1mA for InGaN product and >1.4V@0.1mA for AlInGaP
product.
Drive Method
An LED is a current-operated device. In order to ensure intensity uniformity on multiple LEDs connected in
parallel in an application, it is recommended that a current limiting resistor be incorporated in the drive circuit,
in series with each LED as shown in Circuit A below.
When selecting power for LED systems, it’s essential to understand several key parameters to ensure safe operation, longevity, and optimal performance. Here are some steps and considerations for LED power selection:
- Determine the Forward Voltage (Vf) of the LED(s):
Each LED has a forward voltage, which is the voltage at which the LED operates when the current is flowing through it. This value can typically be found in the LED’s datasheet.
- Determine the Forward Current (If) of the LED(s):
The forward current is the current at which the LED is designed to operate. Running an LED at higher than its rated current can reduce its lifespan and increase the heat it produces.
- Decide on the Configuration:
Series Configuration: When LEDs are connected in series, the forward voltages add up, but the current remains the same.
Parallel Configuration: When LEDs are connected in parallel, the forward voltage remains the same, but the currents add up. This configuration can be risky because if one LED fails or has a slightly lower forward voltage, it can cause the other LEDs to draw more current.
Calculate Total Power Requirements:
Power (W) = Total Forward Voltage (V) x Total Forward Current (A)
For example, if you have three LEDs connected in series, each with a forward voltage of 3V and a forward current of 20mA, the total power requirement would be:
Power = (3V + 3V + 3V) x 20mA = 9V x 0.02A = 0.18W
- Select an Appropriate Power Supply:
- Voltage Rating: The power supply voltage should match or slightly exceed the total forward voltage of your LED configuration.
- Current Rating: The power supply’s current rating should meet or exceed the total forward current of your LED configuration.
- Safety Margin: It’s a good practice to select a power supply that can provide at least 20% more power than your calculated requirement. This ensures the power supply isn’t operating at its maximum capacity, which can extend its life and ensure safer operation.
- Consider Additional Features:
- Dimming Capability: If you want to control the brightness of your LEDs, choose a power supply with dimming capabilities.
- Overcurrent and Overvoltage Protection: To protect your LEDs, select a power supply with built-in protection mechanisms.
- Thermal Management: Ensure that the power supply has adequate cooling, especially if it will be enclosed or in a location with limited airflow.
- Regulation and Efficiency:A power supply with good regulation will maintain a consistent voltage output despite variations in the load. High efficiency ensures minimal power is wasted as heat.
- Physical Size and Form Factor:Depending on where you plan to place the power supply, its size and shape may be critical factors.
In summary, when selecting power for LED systems, understanding your LED’s requirements and the configuration you plan to use is essential. Then, pick a power supply that meets those needs with some added safety margin, keeping in mind any additional features or constraints relevant to your project.
Here are some well-regarded brands in the industry:
- Mean Well: One of the most recognized brands in the LED power supply industry, Mean Well offers a wide range of products suitable for both indoor and outdoor applications. Their units often come with features like overcurrent protection, dimming capabilities, and high efficiency.
- Tridonic: A global leader in lighting technology, Tridonic offers LED drivers and power supplies that cater to various lighting solutions, from simple setups to advanced smart lighting systems.
- Philips Advance Xitanium: Philips is a well-known brand in the lighting industry, and their Xitanium series of LED drivers are known for reliability and performance. They cater to both indoor and outdoor LED applications.
- Osram: Another giant in the lighting industry, Osram offers a range of LED drivers and power supplies suitable for various applications, including architectural and street lighting.
- LIFUD: Specializing in LED drivers, LIFUD is known for its high-quality products that cater to both commercial and residential LED lighting solutions.
- MOSO: This brand offers a variety of LED drivers, especially for outdoor and industrial applications. Their products are known for durability and performance.
- TDK-Lambda: With a history in power electronics, TDK-Lambda offers a range of power supplies and LED drivers suitable for various applications, emphasizing reliability and advanced features.
