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Ultra bright yellow common cathode 4 digit 7 segment led display for temperature humidity indicator
Product Overview
This 0.49-inch (12.4mm) 4-digit common cathode 7-segment LED display is a multi-application optimized solution, engineered for clear, reliable numeric readouts of temperature/humidity, time, and operational parameters. Featuring ultra bright yellow light (585–590nm wavelength, 70–80mcd luminous intensity) and a high-contrast white-segment-on-black-surface design, it delivers crisp visibility in both bright indoor and dim ambient light conditions.
With its compact 37.3×19×8mm dimensions, the display fits seamlessly into dense PCB layouts of set-top boxes, home appliances, instrument panels, digital timers, and clock indicators. The common cathode polarity ensures compatibility with mainstream driver ICs (e.g., TM1637, MAX7219, HT1621), while high efficiency, low power consumption, and uniform segment brightness make it ideal for 24/7 stable operation of battery-powered or AC-powered devices. RoHS compliance further enables global market deployment without regulatory barriers.
Core Technical Specifications
| Category | Parameter | Specification (Multi-Application Optimized) |
| Basic Design | Display Type | 4-Digit 7-Segment LED Display |
| Digit Height | 0.49 inch (12.4mm) | |
| Outer Dimensions (L×W×H) | 37.3 × 19 × 8mm | |
| Segment/Surface Finish | White Segments on Black Surface | |
| Polarity | Common Cathode | |
| Optical Performance | Primary Emitting Color | Ultra Bright Yellow |
| Wavelength | 585–590nm | |
| Luminous Intensity | 70–80 mcd/LED | |
| Optional Emitting Colors | Various colors available (customizable per order) | |
| Electrical Parameters | Forward Voltage (VF) | 1.8–2.3V/LED (yellow variant) |
| Recommended Forward Current | 10–15mA/LED | |
| Power Traits | High luminous intensity, high efficiency, low power consumption, extremely low current | |
| Quality & Performance | Core Advantages | Uniform segment brightness, stable 24/7 operation, easy PCB assembly, IC compatible |
| Compliance | RoHS Compliant (default, REACH optional) |
Key Features (Multi-Scenario Optimized)
1. High-Contrast Visibility for Diverse Numeric Readouts
Ultra Bright Yellow Illumination: The 585–590nm yellow light strikes a balance between readability and eye comfort, making it ideal for displaying temperature/humidity values , time , and set-top box parameters. Unlike harsh red or blue light, yellow reduces eye fatigue during long-term monitoring of home appliances and instruments.
White Segments + Black Surface Contrast: Eliminates ambient light glare and ensures digits remain crisp even in high-humidity environments. No "washout" issues that obscure critical data like 0℃ freeze alerts or 99min timer countdowns.
Uniform Segment Luminance: ≤5% brightness variation across all segments prevents digit distortion and ensures consistent readability of precision values.
2. Energy Efficiency for Continuous & Intermittent Operation
Low Power Consumption & Extremely Low Current: 10–15mA recommended forward current minimizes energy use for battery-powered devices and reduces standby power draw for AC-powered equipment . Extends battery life to 6–12 months for portable models, reducing user maintenance hassle.
High Efficiency: Converts more electrical energy into light rather than heat, preventing overheating in compact enclosures and ensuring stable performance during 24/7 operation.
3. Manufacturer-Friendly Easy Integration
Common Cathode IC Compatibility: Works seamlessly with standard driver ICs and microcontrollers widely used in home appliances and industrial instruments. Simplifies circuit design for dual parameter display, time counting, and set-top box channel/volume readouts.
Compact Industrial Size: The 37.3×19×8mm slim profile fits into narrow PCB layouts of set-top boxes, digital timers, and wall-mounted thermostats—no custom PCB redesign required. Supports automated SMT production lines for high-volume manufacturing, reducing assembly costs for manufacturers.
Flexible Decimal Point Customization: Supports 1–2 decimal point positions or colon inclusion to adapt to different application needs, from precision temp-humidity monitoring to digital clock displays.
4. Versatile Multi-Color Customization for Functional Coding
Optional emitting colors enable targeted use across diverse scenarios:
Red: High-visibility for over-temperature/over-humidity alerts or set-top box error codes
Pure Green: Normal/optimal status cues
Blue: Modern aesthetics for premium smart home 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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