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Ultra white 7mm 4 Digit 7 Segment LED Clock Display Common cathode for digital timer
Product Overview
This 0.28-inch (7mm) 4-digit common cathode 7-segment LED display is a timer and clock-optimized solution, engineered for clear, energy-efficient numeric readouts of countdown values, time, and equipment parameters. With ultra bright white illumination (120–140mcd/LED) and a slim 30.1×10×5.8mm footprint, it fits seamlessly into narrow PCB layouts of digital timers, set-top boxes, and home appliance control panels.
The common cathode polarity ensures compatibility with mainstream driver ICs (e.g., TM1637, MAX7219), while its low power consumption, stable performance, and RoHS compliance make it ideal for 24/7 intermittent or continuous operation. Multi-color emission options further support functional coding and aesthetic customization, catering to diverse residential and commercial application needs.
Core Technical Specifications
| Category | Parameter | Specification (Timer/Clock-Optimized) |
| Basic Design | Display Type | 4-Digit 7-Segment LED Display |
| Digit Height | 7mm (0.28 inch) | |
| Outer Dimensions (L×W×H) | 30.1 × 10 × 5.8mm | |
| Polarity | Common Cathode | |
| Optical Performance | Primary Emitting Color | Ultra Bright White |
| Optional Emitting Colors | Red, Blue, Yellow Green, Pure Green, Amber, Orange, Yellow | |
| Luminous Intensity | 120–140 mcd/LED | |
| Key Optical Traits | Uniform segment brightness, big viewing angle | |
| Electrical Parameters | Forward Voltage (VF) | 2.8–3.2V/LED |
| Recommended Forward Current | 5–10mA/LED | |
| Power Traits | High efficiency, low power consumption, extremely low current | |
| Quality & Compliance | Core Advantages | High reliability, stable performance, long lifespan, easy assembly, IC compatible |
| Compliance | RoHS Compliant |
Key Features (Timer & Clock-Optimized)
1. High-Visibility Readability for Time & Countdown Values
Ultra Bright White Illumination: The 120–140mcd brightness delivers crisp, eye-friendly readouts of timer countdowns (e.g., 01:30, 00:05) and clock time, even in bright ambient light (kitchens, living rooms, office spaces).
Big Viewing Angle (≥120° H/V): Ensures digits are readable from side or oblique positions—critical for under-cabinet kitchen timers, wall-mounted clocks, and set-top box displays where users are not directly in front of the panel.
Uniform Segment Luminance: ≤5% brightness variation across all segments eliminates digit distortion, preventing misreading of time values (e.g., 10 vs 01) in precision timer applications.
2. Energy Efficiency for Long-Term Operation
Low Power Consumption (5–10mA/LED): Minimizes energy use for battery-powered portable timers, extending battery life to 6–12 months on a single charge. For AC-powered devices (e.g., set-top boxes, smart home appliances), it reduces standby power draw to meet energy-saving standards.
High Efficiency: Converts more electrical energy into light rather than heat, avoiding overheating in compact timer enclosures and ensuring stable performance during prolonged countdowns or clock operation.
3. Manufacturer-Friendly Easy Integration
Common Cathode IC Compatibility: Works seamlessly with standard driver ICs and microcontrollers (Arduino, ESP32, PLCs) widely used in timer and clock systems. Simplifies circuit design for countdown functions, time display, brightness adjustment, and end-of-timer alert triggers.
Compact Size: The 30.1×10×5.8mm slim profile fits into the narrowest PCB layouts of small digital devices—no custom PCB redesign required, supporting automated SMT production lines for high-volume manufacturing.
Easy Assembly: Standardized through-hole or SMT pinout design enables quick, secure installation, reducing labor costs and assembly time for mass production of timers and home appliances.
4. Versatile Multi-Color Customization
Optional emitting colors support functional coding and aesthetic matching for diverse scenarios:
Red: High-visibility for timer end alerts (e.g., kitchen timer finish prompts, industrial process countdown warnings)
Pure Green: Normal operation status for clocks and set-top box time displays
Amber: Warm retro aesthetics for vintage-style digital clocks and home appliances
Blue: Modern, sleek look for premium smart home timers and IoT-enabled devices
Product Image
Product Parameters
Absolute Maximum Ratings(Ta=25ºC)
| Parameter | Symbol | Ratings | Unit |
| Forward Current(per dice) | Ipm | 20 | mA |
| Reverse Voltage(per dice) | Vr | 5 | V |
| Power Dissipation(per dice) | Pm | 80 | mW |
| Operating Temperature Range | Topr | -40~+85 | ºC |
| Storage Temperature Range | Tstg | -40~+85 | ºC |
| Solder Temperature(≤3 seconds) | Th | 260 | ºC |
Code:Yellow Green- J
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
| Forward Voltage | Vf | If=10mA | 1.8 | 2.4 | V | |
| Reverse Voltage | Vr | Ir=10uA | 5 | V | ||
| Luminous Intensty | Iv | If=10mA | 30 | 40 | mcd | |
| Spectrum With Of Half Value | △λ | If=10mA | 20 | nm | ||
| Wavelength | Dλ | If=10mA | 569 | 574 | nm |
Code:Amber/Yellow -Y
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
| Forward Voltage | Vf | If=10mA | 1.8 | 2.5 | V | |
| Reverse Voltage | Vr | Ir=10uA | 5 | V | ||
| Luminous Intensty | Iv | If=10mA | 60 | 80 | mcd | |
| Spectrum With Of Half Value | △λ | If=10mA | 20 | nm | ||
| Wavelength | Dλ | If=10mA | 585 | 595 | nm |
Code:Orange -F
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
| Forward Voltage | Vf | If=10mA | 1.8 | 2.4 | V | |
| Reverse Voltage | Vr | Ir=10uA | 5 | V | ||
| Luminous Intensty | Iv | If=10mA | 60 | 80 | mcd | |
| Spectrum With Of Half Value | △λ | If=10mA | 20 | nm | ||
| Wavelength | Dλ | If=10mA | 600 | 605 | nm |
Code:Super Bright Red -R
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
| Forward Voltage | Vf | If=10mA | 1.8 | 2.2 | V | |
| Reverse Voltage | Vr | Ir=10uA | 5 | V | ||
| Luminous Intensty | Iv | If=10mA | 50 | 60 | mcd | |
| Spectrum With Of Half Value | △λ | If=10mA | 20 | nm | ||
| Wavelength | Dλ | If=10mA | 630 | 635 | nm |
Code:Ultra Bright Red -UR
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
| Forward Voltage | Vf | If=10mA | 1.8 | 2.2 | V | |
| Reverse Voltage | Vr | Ir=10uA | 5 | V | ||
| Luminous Intensty | Iv | If=10mA | 80 | 100 | mcd | |
| Spectrum With Of Half Value | △λ | If=10mA | 20 | nm | ||
| Wavelength | Dλ | If=10mA | 625 | 635 | nm |
Code:Pure Green -G
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
| Forward Voltage | Vf | If=10mA | 2.6 | 3.2 | V | |
| Reverse Voltage | Vr | Ir=10uA | 5 | V | ||
| Luminous Intensty | Iv | If=10mA | 120 | 180 | mcd | |
| Spectrum With Of Half Value | △λ | If=10mA | 20 | nm | ||
| Wavelength | Dλ | If=10mA | 515 | 525 | nm |
Code:Ultra Bright Blue -BH
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
| Forward Voltage | Vf | If=10mA | 2.8 | 3.2 | V | |
| Reverse Voltage | Vr | Ir=10uA | 5 | V | ||
| Luminous Intensty | Iv | If=10mA | 120 | 140 | mcd | |
| Spectrum With Of Half Value | △λ | If=10mA | 20 | nm | ||
| Wavelength | Dλ | If=10mA | 460 | 465 | nm |
Code:Ultra Bright White -WH
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
| Forward Voltage | Vf | If=10mA | 2.8 | 3.2 | V | |
| Reverse Voltage | Vr | Ir=10uA | 5 | V | ||
| Luminous Intensty | Iv | If=10mA | 120 | 140 | mcd | |
| LED color Temperature | K | If=10mA | 5500 | 20 | 6800 | K |
Chromaticity Coordinates | X/Y | If=10mA | 0.29,0.32 | 0.30,0.33 | nm |
Shenzhen Guangzhibao Technology Co., Ltd. (Brand: Light-Bo) stablished in 2006 , A company that integrates R & D, manufacturing and sales of optoelectronics LED Displays . ISO 9001 2015 Quality Management Systems certified company . With more than 15 years OEM and ODM experience .
Light Bo has been committed to provide high quality and low cost customized solutions to help customers reduce cost and enhance competitiveness.
Products Applications
7 Segment LED Display, Customized LED Display, Numeric LED Display, Dot matrix LED Display, widely used for home appliances,tempearture indicators, humidity indicators, refrigerator controller,thernostats indicator,heating and cooling control and so on.
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FAQ
FAQ(Frequently Asked Questions)
Q1 Are you trading company or manufacturer?
A: We are original manufacturer with more than 20 years experience in optoelectronic LED displays .
Q2 What is your main products?
A: Our main products include 7 Segment LED display, SMD LED Display,Dot matrix LED Display, Arrow LED display, Custom Design LED Display ,LED light bar,Through hole led, SMD LEDs,LED Backlights, and so on .
Q3 What is your MOQ?
A: Our MOQ is 1000 pcs , We can also accept sample orders and small orders with quantity less than our MOQ .
Q4 Before placing order, Can I get some samples for test?
A: Yes. We can provide 5-10 free samples for your testing, but the freight cost will be borne by the customer.
Q5 How long is your delivery time?
A: Delivery time:About 10-20 days; According to order quantity and raw materials. If you have urgent order,and we have raw materials in stock,we can adjust our production plan to make it ready within 7-10 days .
Q6 What is your terms of payment?
A: We accept bank transfer,T/T,Western Union and Paypal with small amount. Detailes of payment methods can be negotiatble.
Q7 Can you quote me FOB prices?
A: Yes. We can quote you prices based on incoterms EXW, FOB, CIF,DDP.
Q8 How can I get your catalogue and price list?
A: Yes . Please let us know your email address or contact us from website directly for our catalogue and price list .
Q9 Can I negotiate the prices?
A: Yes, we may consider discounts for bulk orders.
Q10 How much will the shipping charges be?
A: It depends on the size of your shipment and the method of shipping.We will offer the charge to you as you requested.
Q11 Can you do custom design products?
A: Yes , OEM&ODM service are available .We can customize the sizes,led color and functional icons according to your requirements.
Q12 If I send my design , can you make it for myself only ,and will not show it to any one else?
A: Yes , we will not show it or sell to others without your authorization.
Q13 What will be the samples lead time for customized products?
A: Samples lead time will be about 20-25 working days after receiving mold cost and mold drawing approval from customers .
Q14 What is the shipping methods?
A:We usually ship the goods by DHL, FEDEX,UPS,EMS,BY AIR,BY SEA etc, also you can choose the other way that best for you.
Q15 How do you ensure the quality of your products?
A: we are ISO 9001 QMS ceritified manufacturers with more than 20 years experience ,We conduct twice 100% percent test for all of our products before shipment .
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