0.39 inch dual-digit seven segment led display | Hi Red

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Product Series
Series No:BL-D39A-21
Specification Download:
19.9 × 12.8 × 7 mm
0.39 inch double numeric LED display

Introduction to Segment Display Technology

The segment display, particularly the 0.39 inch dual seven segment display, represents a significant advancement in electronic visualization. With its capacity to illuminate specific segments to form numbers and a limited set of characters, this technology has simplified the way information is displayed, making it more accessible and easier to understand for users across various applications.

Core Features of the 0.39 Inch Display

This dual-digit segment display stands out for its compact size, enhanced brightness, and energy efficiency. These characteristics not only make it suitable for a wide range of electronic devices but also ensure that it delivers high performance while maintaining low power consumption.

Versatile Applications

From digital clocks and calculators to more sophisticated uses in control panels and medical devices, the dual seven segment display is remarkably versatile. Its reliability and ease of readability have made it an indispensable component in both consumer electronics and industrial applications.

Benefits of Using Dual-Digit Seven Segment Displays

The adoption of these displays brings numerous advantages. For manufacturers, the balance between size and visibility allows for more compact device designs without sacrificing user interface quality. For users, the immediate benefit is the clear and straightforward presentation of information, enhancing the overall usability of devices.

Case Studies: A Closer Look

Examining real-world applications reveals the impact of 0.39 inch dual-digit seven segment LED displays. One case study involves their use in portable medical equipment, where the display's clarity and reliability have significantly contributed to improving patient care and device functionality.

Hearing from the Users

User testimonials provide invaluable insights into the practical advantages of these displays. Engineers appreciate the ease of integration and reliability, purchasers highlight the cost-effectiveness and durability, and administrators note the benefits of standardization and inventory management.

The Future of Seven Segment Displays

As technology progresses, the evolution of seven segment displays continues to enhance their efficiency, readability, and application potential. This forward momentum promises even greater advancements in electronic display technology, with the 0.39 inch dual-digit seven segment LED display at the forefront of this innovation.

Conclusion: Embracing the Future of Digital Displays

The 0.39 inch dual-digit seven segment LED display exemplifies the intersection of functionality and innovation in electronic display technology. Its broad applicability, combined with the tangible benefits it offers to both manufacturers and users, positions it as a critical component in the advancement of electronic devices. As we move forward, the significance of these displays in shaping the future of electronic visualization cannot be overstated.
0.39 inch dual-digit seven segment led display
0.39 inch dual-digit seven segment led display


  • 0.39 Inch Digit Height (10.0mm): Offers clear and visible numeric displays, ideal for readability in compact spaces.
  • Compact Dimensions: Measuring 19.9 x 12.8 mm, it's well-suited for small-scale applications where space is limited.
  • Low Current Operation: Energy-efficient design, reducing power consumption and making it ideal for battery-powered or energy-sensitive devices.
  • Common Anode and Common Cathode Availability: Flexible design accommodating different circuit configurations.
  • Excellent Character Appearance: Ensures sharp and clear numeric displays for ease of readability.
  • High Light Output: Bright display ensures visibility in various lighting conditions.
  • Easy Mounting on PC Boards or Sockets: Simplifies the process of integration onto printed circuit boards or into sockets, facilitating ease of assembly.
  • IC Compatible: Can be easily interfaced with various integrated circuits, suitable for complex electronic designs.
  • Multicolor Availability: Available in different colors, providing options for customization and various design requirements.
  • Categorized for Luminous Intensity: Ensures uniform brightness across units for consistent performance.
  • Technically Rugged: Durable and reliable, built to withstand various operational conditions and environments.
  • Standard Design: Features a gray surface with white segments, offering a classic and clear display appearance.
  • RoHS Compliance: Manufactured following environmental and health safety standards.


  • Digital Clocks and Timers: Ideal for timekeeping devices in various environments, such as schools, offices, and public transport systems.
  • Electronic Scoreboards: Suitable for sports arenas, gyms, and event venues for displaying scores or other numerical information.
  • Industrial Equipment: Used in machinery and control systems for displaying measurements, counts, or operational data.
  • Consumer Electronics: Incorporated in household appliances like microwaves, ovens, washing machines, and audio equipment for setting displays.
  • Medical Devices: Employed in medical equipment for showing readings, timers, and other vital data.
  • Automotive Displays: Applicable for small indicator displays in vehicle dashboards, such as warning lights or small gauge readouts.
  • Control Panels: Used in control panels in machinery, elevators, or HVAC systems, providing clear numeric readings.
  • Telecommunication Equipment: Incorporated in network hardware for displaying signal strength or channel numbers.
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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