Customized  pure green 3 1/2 Digits 7 segment led display common cathode for temperature indicator

Product Overview

Introducing the 3½-Digit 7-Segment Common Cathode LED Display—a high-visibility, reliable numeric solution engineered specifically for thermostats, air conditioner controls, and refrigerator temperature monitors. Its unique 3½-digit design (supports values up to 1999, ideal for temperature ranges like -40°C to 120°C) and vivid pure green illumination (515-525nm wavelength, 140-160mcd/LED) ensure precise, easy-to-read temperature data—critical for heating/cooling system accuracy.

With a 0.5" (12.7mm) character height for clear visibility from room distances, white segments on a black surface (enhanced by a protective film for durability), and a slim 38.2×19×8mm form factor, it fits seamlessly into thermostat control panels. The common cathode configuration simplifies integration with HVAC and appliance control boards, while low power consumption, long lifetime, and RoHS compliance make it a sustainable choice for long-term temperature monitoring applications. Multiple emitting color options further adapt to diverse product designs.

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Key Features

1. Temperature Control-Optimized Design

3½-Digit Layout: Unique configuration supports both small and large temperature ranges (e.g., 0.1°C precision for room thermostats, -40°C to 120°C for HVAC systems) with a leading "half digit" (shows "1" for values ≥1000, e.g., "125.0°C"), eliminating the need for multiple displays.

Pure Green Illumination: 515-525nm wavelength and 140-160mcd/LED high luminous intensity cut through ambient light (e.g., living room lamps, office overhead lights), ensuring temperature readings are visible at a glance—no squinting or leaning in.

White Segments on Black Surface: High contrast design enhances readability of decimal points (critical for precise temp data like "23.5°C") and negative signs (for sub-zero temps like "-5°C"), reducing user error in setting or monitoring temperatures.

2. Durability & Practicality

Protective Surface Film: The black surface is coated with a durable film that resists fingerprints, dust, and minor scratches—common in high-touch thermostat panels—while simplifying cleaning and extending the display's lifespan.

0.5" (12.7mm) Character Height: Balances readability (from 1-2 meters, typical thermostat placement distance) and space efficiency (fits into slim thermostat enclosures without dominating the design).

Stable Performance in Temperature Cycles: Engineered to withstand the temperature fluctuations of HVAC environments (e.g., 0°C to 40°C), maintaining consistent brightness and segment clarity without flickering.

3. Easy Integration & Efficiency

Common Cathode Configuration: Works seamlessly with standard thermostat and HVAC driver ICs (e.g., TM1637, MAX7219), reducing circuit design complexity for manufacturers and ensuring compatibility with existing control systems.

Low Power Consumption: Optimized forward voltage (2.8-3.5V) minimizes energy use—critical for battery-powered thermostats or energy-efficient HVAC systems, aligning with global sustainability standards.

Easy Assembly: Designed for hassle-free PCB mounting, compatible with automated production lines for high-volume thermostat and appliance manufacturing.

4. Compliance & Flexibility

RoHS Certified: Meets international environmental and safety standards, ensuring compatibility with global markets (Europe, North America, Asia, etc.) and avoiding regulatory barriers for export.

Multi-Color Options: Beyond pure green, choose from red, blue, white, amber, yellow, or orange to match product aesthetics or functional needs (e.g., red for "high temp alerts," green for "normal range").

Long Lifetime: High-quality LED chips ensure a typical lifespan of 50,000+ hours—matching the 5-10 year service life of thermostats and HVAC systems, minimizing maintenance costs for end-users.

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Technical Specifications

Applications

This 3½-digit LED display is specifically optimized for:

Thermostats: Home, commercial, or smart thermostats (displaying room temperature, set temperature, or humidity levels).

HVAC Controls: Air conditioner, heater, or heat pump controllers (showing discharge temperature, fan speed, or error codes).

Refrigerator/Freezer Controls: Displaying interior temperatures (e.g., "5°C" for fridge, "-18°C" for freezer) or defrost cycle status.

Temperature Indicators: Industrial temperature monitors, food storage thermometers, or medical refrigeration displays (for precise temp tracking).

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Why Choose This Display for Temperature Controls?

3½-Digit Precision: Ideal for temperature ranges requiring both small increments (0.1°C) and large values (-40°C to 120°C), eliminating the need for multiple displays.

Thermostat-Friendly Visibility: Pure green light and high contrast ensure readability from room distances, aligning with how users interact with thermostats (glancing from across the room).

Long-Term Reliability: RoHS compliance and long lifespan match the durability of thermostats/HVAC systems, reducing replacement needs.

Easy HVAC Integration: Common cathode configuration works with standard control board ICs, cutting development time for manufacturers.

Space-Efficient: Slim 38.2×19×8mm size fits into modern, compact thermostat designs without compromising on readability.