Ultra bright blue 0.4" 4 Digit 7 Segment LED Display common cathode for digital timer and temperature indicator

Product Overview

Introducing the Ultra Bright Blue 0.4-Inch (10.16mm) 4-Digit 7-Segment Common Cathode LED Display—a precision numeric solution engineered for digital timers, temperature controllers, and compact electronic devices. Designed to prioritize clarity, energy efficiency, and versatility, this display excels at showing critical metrics: time (e.g., "05:30" for countdown timers), temperature (e.g., "-18.0°C" for freezers), or device status (e.g., "240V" for instrument panels).

Its 0.4-inch (10.16mm) character height ensures readability from 1–2 meters (typical user distance for timers/thermostats), while the ultra-slim 40.5×16×7mm form factor fits seamlessly into space-constrained devices—from small tabletop timers to set-top box front panels. The white segments on a black surface boost contrast with ultra bright blue light (462-465nm), cutting through ambient glare (e.g., kitchen lights, sunlight) for consistent visibility. With common cathode polarity, low power consumption (5-10mA/LED), and RoHS compliance, it balances reliability, energy efficiency, and global safety standards—ideal for 24/7 operation in home and industrial settings.

Main Image

Detail Image

Key Features (Timer/Temperature-Optimized)

1. Superior Visibility for Critical Metrics

Ultra Bright Blue Illumination: 80-100mcd luminous intensity and 462-465nm wavelength deliver crisp, modern blue light—perfect for temperature/timer readouts, as blue minimizes eye strain while standing out against dark device enclosures (e.g., black temperature controllers).

White Segments on Black Surface: High contrast eliminates glare and ensures digits (and decimal points for precise temp/time) are sharp—critical for accurate readings (e.g., distinguishing "25.1°C" vs. "25.7°C" in a thermostat).

10.16mm Character Height: Balances readability and compactness—large enough to avoid squinting at small values (e.g., "0.5°C"), but small enough for portable timers or slim instrument panels.

2. Energy Efficiency for Continuous Use

Extremely Low Current (5-10mA/LED): Minimizes power draw, making it ideal for battery-powered devices (e.g., portable temperature sensors) or energy-efficient home appliances—extends battery life by 25-30% compared to higher-current displays.

Low Forward Voltage (2.8-3.2V): Compatible with standard low-voltage power supplies (e.g., 3V coin cells, 5V USB) commonly used in timers and controllers, avoiding the need for bulky voltage converters.

3. Reliable Performance & Easy Integration

Stable Operation: Engineered to withstand temperature fluctuations (0°C–50°C, typical for home/industrial environments) and minor vibrations (e.g., placing a timer on a kitchen counter), maintaining consistent brightness and segment uniformity—no flickering during temp/time updates.

Long Lifespan (50,000+ Hours): High-quality LED chips ensure the display lasts as long as the device itself (e.g., 5–10 years for a home thermostat), reducing maintenance and replacement costs.

Common Cathode Polarity: Works with standard timer/temperature driver ICs (e.g., TM1637, HT1621, MAX7219)—simplifies circuit design for manufacturers and supports seamless integration with existing firmware (e.g., temperature sampling or timer counting).

Easy Assembly: Designed for hassle-free PCB mounting, compatible with automated production lines for high-volume devices (e.g., mass-produced digital thermometers, set-top boxes).

4. Versatility & Compliance

Multi-Color Options: Beyond ultra bright blue, choose from red (for alerts), green (for "normal" status), amber, orange, or white—flexible for functional cues (e.g., red for "high temp" warnings, blue for standard readings) or brand aesthetics.

RoHS Compliant: Free from harmful substances (lead, mercury), meeting international safety standards for consumer and industrial electronics—suitable for global markets (Europe, North America, Asia).

Technical Specifications

Applications

While optimized for digital timers and temperature indicators, this display also excels in:

Set-Top Boxes: Front-panel time (e.g., "20:15") or channel/timer values (e.g., "120" for channel 120).

Home Appliances: Microwave timers (e.g., "02:00"), oven temperature (e.g., "200°C"), or fridge/freezer indicators (e.g., "5.0°C").

Instrument Panels: Compact industrial devices (e.g., voltage monitors showing "12.5V," pressure gauges showing "0.8MPa").

Portable Electronics: Handheld temperature sensors (e.g., "37.5°C" for body temp), battery-powered timers (e.g., "10:00" for workout time).

Application Image

Why Choose This Display for Timers/Thermostats?

Precision Readability: 4-digit layout + decimal point support ensures accurate temp/time readings (e.g., "0.1°C" increments for thermostats).

Glare-Free Visibility: Blue light + high contrast work in bright/dim environments, avoiding squinting at critical metrics.

Battery-Saving Design: Low current use extends battery life for portable devices—users replace batteries less frequently.

Compact Fit: 40.5×16×7mm size fits into slim devices (e.g., pocket timers, wall-mounted thermostats) without compromising readability.

Global Market Ready: RoHS compliance and multi-color options simplify export to international markets, aligning with diverse brand needs.

Order & Logistics Information

Minimum Order Quantity (MOQ): 300 pieces for standard ultra bright blue models; 500 pieces for custom colors/configurations.

Packing: Protective EPE (Expandable Polyethylene) + anti-static carton (ensures segments and pins remain intact during shipping).

Delivery Time: 5–7 days for standard models; 10–12 days for custom colors or configurations.

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

Contact Us

Our team specializes in LED displays for precision metrics (time/temperature) and provides 24-hour support to help you optimize your device's usability, energy efficiency, and visual appeal!