Super Bright Red 10mm (0.39-Inch) 4-Digit 7-Segment Common Cathode LED Display for Temperature Controllers

Product Overview

Introducing the Super Bright Red 0.39-Inch 4-Digit 7-Segment Common Cathode LED Display—a temperature-focused numeric solution engineered for temperature controllers, home appliances, and instrument panels. Designed to prioritize clarity, energy efficiency, and reliable temp tracking, this 4-digit display excels at showing detailed temperature metrics: precise room temps (e.g., "23.8°C"), sub-zero freezer values (e.g., "-20°C"), or industrial process temps (e.g., "150°C").

Its 10mm (0.39-inch) character height ensures readability from 0.5–2 meters (typical distance for controller operation), while the 40×12.6×7mm form factor fits into slim control panels—no bulky redesigns required. The white segments on a black surface create sharp contrast with super bright red light (620-625nm), cutting through ambient glare (e.g., kitchen lights, workshop lamps) and standing out for temp alerts (e.g., "30°C" high temp).

With common cathode polarity, low power use, and RoHS compliance, this display balances durability, user-friendliness, and performance—ideal for 24/7 operation in temperature-sensitive devices.

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Key Features (Temperature Controller-Optimized)

1. Superior Visibility for Temp Readouts

Super Bright Red Illumination (60-70mcd): Red light (620-625nm wavelength) is highly distinguishable in diverse environments, making temp values easy to spot at a glance. It avoids glare in dim spaces (e.g., bedroom thermostats) and resists washout in bright areas (e.g., kitchen appliance panels)—critical for quickly identifying "too high" or "too low" temps.

White Segments on Black Surface: High contrast eliminates "fuzzy" edges on digits, ensuring clarity for decimal points (e.g., "24.5°C") and negative signs (e.g., "-15°C" for freezers)—no misreading "6°C" as "0°C" (a costly mistake for food storage or equipment safety).

4-Digit Precision: Supports detailed temp readouts (e.g., "025.5°C" for low temps, "120.0°C" for industrial use) — ideal for high-precision controllers (e.g., lab thermostats, smart HVAC systems) that require fine value tracking.

2. Compact & Easy to Integrate

Slim Dimensions (40×12.6×7mm): Fits into dense temperature controller PCBs or small home appliance panels (e.g., mini fridges, portable ACs) — enables multi-display setups (e.g., temp + humidity) without sacrificing space.

Common Cathode Polarity: Works with standard temperature controller driver ICs (e.g., TM1637, HT1621, MAX7219) — simplifies circuit design, no need for custom polarity adapters, and integrates seamlessly with temp-sensing firmware (e.g., real-time sampling, alert triggers).

Easy Assembly: Designed for PCB direct-mounting, compatible with automated production lines — speeds up manufacturing for high-volume controllers and ensures consistent alignment in control panels.

3. Energy Efficient & Stable Performance

Low Power Consumption (5-10mA/LED): Extremely low current draw minimizes energy use, extending battery life for portable temperature controllers (e.g., handheld fridge thermometers) by 30% compared to higher-current displays. For plugged-in devices (e.g., wall thermostats), it reduces electricity costs to near-negligible levels.

Stable Operation in Temp Fluctuations: Withstands temperature variations (-10°C to 50°C, typical for indoor/outdoor use) and minor vibrations (e.g., appliance fan movement, equipment transport) — maintains consistent brightness, no flickering during temp updates (e.g., when AC cycles on/off).

Long Lifespan (50,000+ Hours): High-quality red LED chips match the 5–8 year service life of most temperature controllers — eliminates frequent display replacements, reducing maintenance hassle for users and manufacturers.

4. Versatility & Compliance

Multi-Color Options: Beyond super bright red, available in blue (modern aesthetics), yellow green (eco-aligned designs), pure green, pure white, amber, and orange — flexible for functional cues (e.g., green for "normal temp", red for "alert") or brand-specific device designs.

RoHS Compliant: Free from lead, mercury, and harmful substances — safe for family-friendly home appliances (e.g., baby bottle warmers) and export to global markets (EU, North America, Asia), meeting temperature controller safety standards.

Technical Specifications

Applications

This display is tailored for temperature controllers and temp-sensitive devices, including:

Temperature Controllers: Smart thermostats (room temp "22.5°C"), freezer monitors ("-18°C"), greenhouse regulators ("25°C"), or industrial process controllers ("120°C").

Home Appliances: Mini fridges (temp "5°C"), electric ovens (preheat temp "180°C"), or portable ACs (set temp "26°C").

Instrument Panels: Lab equipment (sample temp "37°C"), battery chargers (internal temp "40°C"), or fitness gear (body temp "37.5°C").

Other Devices: Set-top boxes (channel "120"), digital clocks (time "14:30"), or humidity monitors (temp "23°C" alongside RH).

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Why Choose This Display for Temperature Controllers?

Precision Temp Readability: 4-digit support + red light ensure accurate tracking of fine temps—critical for lab or industrial use.

Space Efficiency: Slim dimensions fit into compact controllers—enables multi-parameter displays (temp + humidity) without clutter.

Battery-Friendly: Low current use extends life for portable devices—ideal for users relying on handheld temp monitors.

Easy Integration: Common cathode polarity + standard size fit existing controller PCBs—saves manufacturers redesign time.

Global Compliance: RoHS certification ensures export to international markets, aligning with safety standards for temp-sensitive devices.

Order & Logistics Information

Minimum Order Quantity (MOQ): 300 pieces for standard super bright red models; 500 pieces for custom colors.

Packing: Anti-static EPE + carton (each display is individually wrapped to protect segments and pins during shipping).

Delivery Time: 5–7 days for standard orders; 10–12 days for custom color variants.

Transport: Express (FedEx/DHL for urgent prototype orders), Air (medium-volume shipments), Ocean (bulk production runs for controller manufacturers).