0.28 inch dual-digit seven segment led display | Ultra Green

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15 x 10 x 6.1


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Series No:BL-D28A-21
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15 × 10 × 6.1 mm
Exploring the 0.28 Inch Dual-Digit Seven Segment LED Display: A Comprehensive Guide In the realm of digital display technology, the 0.28 inch dual-digit seven segment LED display stands out as a versatile and efficient component. Designed for electronics manufacturers, engineers, purchasers, and administrators alike, this guide delves into the features, applications, benefits, case studies, and user testimonials related to this specific type of display. By understanding its significance and practical uses, stakeholders in the electronics industry can make informed decisions, enhancing their products and systems. Introduction The digit 7 segment display, particularly the 0.28 inch dual-digit variant, represents a significant advancement in LED display technology. Its compact size and clarity of display make it an ideal choice for a wide range of applications, from consumer electronics to industrial control systems. This article explores the nuances of the 0.28 inch dual-digit seven segment LED display, underscoring its features, applications, and the benefits it offers to users. Features of the 0.28 Inch Dual-Digit Seven Segment LED Display This display is known for its precision and efficiency, capable of showing two digits simultaneously, which is advantageous in applications requiring compact and clear numerical readouts. The 'seven segment cathode' and 'seven segment anode' configurations provide flexibility in design, catering to various electrical requirements. Applications Across Industries From digital clocks and calculators to more complex instrumentation like temperature monitors and counters, the two-digit seven segment display finds its utility. Its reliability and readability are key in environments where accurate data representation is critical. The Benefits Unveiled The primary benefits of utilizing a 0.28 inch dual-digit seven segment LED display include energy efficiency, long lifespan, and high visibility. These factors contribute to its popularity across electronic manufacturing sectors, offering a blend of durability and functionality. Case Studies: Real-World Implementations Delving into case studies, we find numerous success stories where the integration of this display technology has led to enhanced product performance. For instance, in digital thermometers, the clear and immediate numeric readout provided by these displays has been instrumental in delivering user-friendly devices. User Testimonials: First-Hand Experiences Testimonials from engineers and purchasers highlight the display's impact on product design and functionality. One electronics manufacturer engineer noted, "The 0.28 inch dual-digit seven segment LED display has streamlined our design process, offering a compact yet powerful solution for our digital devices." Conclusion and Call to Action The 0.28 inch dual-digit seven segment LED display is a cornerstone of modern electronic displays, offering versatility, efficiency, and clarity. Its application across various devices underscores its value in the electronics industry. For manufacturers and designers looking to enhance their products with reliable and high-quality displays, considering this technology is a step in the right direction. Engage with the Future of LED Display Technology Discover how the 0.28 inch dual-digit seven segment LED display can revolutionize your electronic designs and applications. Embrace innovation and elevate your products with this cutting-edge technology.
0.28 inch dual-digit seven segment led display
0.28 inch dual-digit seven segment led display
Features: 0.28 inch Dual-Digit Numeric LED Display
  • Digit height: 7.62mm
  • Overall dimensions: 15.50mm x 15.00mm
  • Low current operation for energy efficiency
  • Options for both Common Anode and Common Cathode configurations
  • Excellent character appearance with high light output for visibility
  • RoHS compliant, ensuring environmental friendliness
  • Compact digital displays in electronic devices
  • Numeric readouts for meters, gauges, and instruments
  • Time displays in small clocks and timers
  • Temperature displays in compact thermostats and controllers
  • Counters and timers in space-limited industrial applications
  • Voltage or current displays in electronic circuits
  • Numeric indicators in various consumer electronics
Dimension and Circuit Drawing:
Related Information


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 SolderingSoldering Iron
Pre-Heat150-180°CPre-Heat100°C Max.Temperature300°C Max.
Pre-Heat Time120sec Max.Pre-Heat Time60sec Max.
Peak Temperature260°C Max.SolderWave260°C Max.Soldering Time3sec Max.(one time only)
Soldering Time10 sec Max.Soldering Time5sec 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


antistatic notice-smd led

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.
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