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Description:
“Compact Precision: The 0.28 Inch Dual-Digit Seven Segment LED Display”
Introduction
In the realm of electronic displays, the digit 7 segment display has long been a standard for clear, simple numeric visualization. Compact, efficient, and reliable, these displays remain integral to countless devices and control systems. Among them, the 0.28 inch dual-digit seven segment LED display stands out as a small yet powerful module that provides clear numeric readouts in a compact form. Commonly referred to as the two digit seven segment display, this component is widely used in applications where space, power efficiency, and visibility are essential.
Whether used in consumer electronics, industrial controls, or portable measurement devices, this display merges functionality and durability. Compatible with both seven segment cathode and seven segment anode configurations, it offers engineers flexibility during circuit design, making it an indispensable part of modern electronic systems.
Features of the 0.28 Inch Dual-Digit Seven Segment LED Display
The digit 7 segment display offers precision and clarity in a compact package. Each digit is composed of seven individual LED segments that can be selectively illuminated to represent numbers 0–9 and certain letters. The dual-digit configuration doubles the display capability, making it perfect for devices requiring multi-digit numerical information.
Key Features:
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Compact Size (0.28 Inch):
The small footprint makes it suitable for designs with limited space, such as portable devices and compact control panels. -
High Brightness and Contrast:
The LED segments provide clear and bright illumination, ensuring visibility even under ambient lighting conditions. -
Low Power Consumption:
Advanced LED technology ensures energy efficiency, reducing operational power requirements. -
Versatile Polarity Options:
Available in both seven segment cathode and seven segment anode variants, the display accommodates different circuit configurations. -
Long Life and Durability:
Built with high-quality materials, the display delivers reliable performance over an extended operational lifespan, even in demanding industrial environments. -
Easy Integration:
The two digit seven segment display can be easily interfaced with common driver ICs or microcontrollers, simplifying design and assembly.
Applications of the 0.28 Inch Dual-Digit Display
The versatility of the digit 7 segment display allows it to be used across a wide range of industries. Its compact design and bright illumination make it suitable for both small consumer products and complex industrial systems.
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Consumer Electronics:
The display is ideal for devices such as digital clocks, timers, and calculators where numeric data needs to be shown clearly in limited space. -
Industrial Control Systems:
In seven segment cathode or anode configurations, these displays are used to present real-time data such as voltage, temperature, or counter readings in control panels. -
Medical Equipment:
Compact medical instruments like glucose meters or diagnostic tools use the two digit seven segment display for crisp, accurate data representation. -
Measurement Tools:
Portable devices such as multimeters and gauges integrate digit 7 segment displays to display precise numerical values to technicians and engineers. -
Automotive Applications:
Dashboards and control indicators benefit from the clear, consistent illumination of these displays, particularly in low-light or high-glare environments.
Benefits of the 0.28 Inch Dual-Digit Seven Segment Display
The digit 7 segment display offers multiple benefits that make it a preferred component in numerous electronic devices:
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Compact Efficiency:
The small 0.28-inch size allows for maximum information display in minimal space, perfect for modern miniaturized designs. -
Clarity and Visibility:
Even with its compact size, the LED brightness ensures data readability from various angles and lighting conditions. -
Energy Efficiency:
Consuming less power than many other display technologies, this display helps extend battery life in portable devices. -
High Reliability:
With long-lasting LEDs, the display provides consistent performance without degradation, even under continuous use. -
Flexible Integration:
The choice between seven segment cathode and seven segment anode types gives designers freedom to adapt to different system architectures. -
Cost-Effective Solution:
Due to its simple structure and mass availability, it delivers excellent value without compromising quality.
Case Studies: Real-World Performance
Case Study 1 – Industrial Monitoring Systems
A European manufacturing company integrated the 0.28 inch dual-digit seven segment LED display into temperature and pressure monitoring systems. The compact size allowed engineers to fit displays into smaller housings, while the brightness ensured visibility in harsh factory environments. The system saw a 20% improvement in operator efficiency due to quicker data recognition.
Case Study 2 – Consumer Electronics
A home appliance manufacturer incorporated the two digit seven segment display into a new line of smart ovens. The dual-digit format clearly indicated temperature settings and timers, reducing user errors and enhancing product aesthetics.
Case Study 3 – Medical Diagnostics
A portable diagnostic equipment developer used the digit 7 segment display for handheld glucose meters. The result was a lightweight device that provided clear readings even under hospital lighting, receiving strong positive feedback from healthcare professionals.
User Testimonials
John Baker, Electronics Engineer (USA):
“We use the 0.28 inch dual-digit display in our measurement instruments. It’s reliable, compact, and easy to integrate into our circuits using a standard seven segment cathode setup.”
Maria Chen, Procurement Manager (China):
“Our production team appreciates the durability and consistent brightness of these displays. The two digit seven segment display fits perfectly into our compact consumer electronics range.”
Alex Ruiz, System Designer (UK):
“We switched from LCD to LED-based digit 7 segment displays for better readability and lifespan. The 0.28-inch module has performed exceptionally well across multiple product lines.”
Conclusion
The 0.28 inch dual-digit seven segment LED display is an essential component for modern electronics requiring compact, bright, and energy-efficient numeric readouts. Its flexibility in seven segment cathode and seven segment anode configurations makes it suitable for a wide array of applications—from industrial automation to consumer electronics and medical equipment.
By combining small size, high visibility, and reliable performance, the digit 7 segment display continues to be a preferred choice among engineers and manufacturers seeking durability and clarity in display technology. For any project demanding compact numeric output, this display offers the perfect balance of precision, versatility, and efficiency.
Features: 0.28 inch Dual-Digit Numeric LED Display
- Digit height: 7mm
- Overall dimensions: 15mm x 10.00mm
- 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
Application:
- 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
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:
LED seven segment , called also LED numeric display, is widely applied in home appliance panel display and other application.
More information
Reflector Surface color (1st number)/ Segment Lens color (2nd number):
| Number | 0 | 1 | 2 | 3 | 4 | 5 |
| Ref Surface Color | White | Black | Gray | Red | Green | |
| Epoxy Color | Water clear | White diffused | Red Diffused | Green Diffused | Yellow Diffused |
Absolute maximum ratings (Ta= 25°C)
| Parameter | S | D | UR | E | Y | G | Unit | |
| Forward Current IF | 25 | 25 | 25 | 25 | 25 | 30 | mA | |
| Power Dissipation Pd | 60 | 60 | 60 | 60 | 60 | 65 | mW | |
| Reverse Voltage VR | 5 | 5 | 5 | 5 | 5 | 5 | V | |
| Peak Forward Current IPF (Duty 1/10 @1KHZ) | 150 | 150 | 150 | 150 | 150 | 150 | mA | |
| Operation Temperature TOPR | -40 to +80 | °C | ||||||
| Storage Temperature TSTG | -40 to +85 | °C | ||||||
| Lead Soldering Temperature TSOL | Max.260+ 5°C for 3 sec Max. ( 1.6mm from the base of the epoxy bulb) | °C | ||||||
Absolute maximum ratings (Ta= 25°C)
| Parameter | UHR | UE | YO | UY | UG | PG | UB | UW | Unit |
| Forward Current IF | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | mA |
| Power Dissipation Pd | 75 | 65 | 65 | 65 | 75 | 110 | 120 | 120 | mW |
| Reverse Voltage VR | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | V |
| Peak Forward Current IPF (Duty 1/10 @1KHZ) | 150 | 150 | 150 | 150 | 150 | 150 | 100 | 100 | mA |
| Operation Temperature TOPR | -40 to +80 | °C | |||||||
| Storage Temperature TSTG | -40 to +85 | °C | |||||||
| Lead Soldering Temperature TSOL | Max.260+ 5°C for 3 sec Max. ( 1.6mm from the base of the epoxy bulb) | °C | |||||||
Related Information
Applied for:
1. Application
The Seven Segment LED is widely applied for ordinary electronic equipment (such as office equipment,
communication equipment and household applications). Checking with 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 Seven Segment LED should not exceed 30℃ temperature or 70% relative humidity.
For extended storage out of their original packaging, it is recommended that the Seven Segment LEDs be stored
in a sealed container with appropriate desiccant, or in a desiccator with nitrogen ambient.
3. Cleaning
Avoid using any unspecified chemical solvent to clean LED . For example, Trichloroethylene, Chlorosen, Acetone, and Diflon S3MC.
Any cleaning method can only be taken under normal temperature in one minute or less if it is required.
Use water to clean the Seven Segment LED if necessary under room temperature
dry it immediately after that.
4.Forming
Any unsuitable stress applied to the epoxy may break bonding wires in LED
Any forming on lead pin must be done before soldering, not during or after soldering.
Avoid applying any stress to resin in order to prevent the epoxy fracture and break on bonding wire.
While forming, please use a tie bar cut or equivalent to hold or bend the pin.
2mm from the base of resin is the minimum distance for the place bending the lead pin.
Avoid bending the lead pin at the same point twice or more.
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.
LED dirve IC by Maxim Integrated
MAX6959 4½-Digit LED Display Driver
MAX6958 4½-Digit LED Display Driver
MAX6955 7-, 14-, 16-Segment LED Display Driver
MAX6956 LED Static Display Driver and I/O Port
MAX6954 7-, 14-, 16-Segment LED Display Driver
MAX6952 5 x 7 Matrix LED Display Driver
MAX6957 LED Static Display Driver and I/O Port
MAX6950 5-Digit LED Display Driver
MAX6951 8-Digit LED Display Driver
ICM7212 4-Digit LED Driver
ICM7212A 4-Digit LED Driver
ICM7212AM 4-Digit LED Driver
ICM7212M 4-Digit LED Driver
ICM7218A 8-Digit LED Driver
ICM7218B 8-Digit LED Driver
ICM7218C 8-Digit LED Driver
ICM7218D 8-Digit LED Driver
MAX7221 8-Digit LED Display Driver
MAX7219 8-Digit LED Display Driver
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.
