SMD seven segment display 0.4 inch 4 digit

SMD seven segment display 0.4 inch 4 digit

Series No:





39 x 15 x 3.75

Character Height: (inch)

0.40 inch






The SMD seven segment display 0.4 inch 4 digit is a crucial component in the electronics industry, known for its clarity, efficiency, and versatility. This display type, often referred to as a smd seven segment display or a 1 inch 7 segment display, is widely used across various applications due to its high performance and reliability. In this article, we will delve into the key features, applications, and benefits of the smd seven segment display. Additionally, we will present case studies and user testimonials to illustrate its practical utility for electronics manufacturers, engineers, and purchasers.

Features of the SMD Seven Segment Display 0.4 Inch 4 Digit

The SMD seven segment display 0.4 inch 4 digit boasts several notable features that make it a preferred choice in the industry:

  • High Brightness and Clarity: This display ensures excellent visibility, making it easy to read even in low-light conditions.
  • Compact Design: The small size of the display makes it ideal for applications where space is a constraint.
  • Energy Efficiency: Utilizing SMD LED technology, these displays consume minimal power, making them ideal for battery-operated devices.
  • Durability: Designed to withstand various environmental conditions, these displays are robust and long-lasting.

Applications of the SMD Seven Segment Display 0.4 Inch 4 Digit

This versatile display is used in a wide array of applications due to its adaptability and functionality:

  • Digital Clocks and Timers: Commonly used in digital clocks, countdown timers, and stopwatches, providing precise timekeeping and easy readability.
  • Measurement Instruments: Utilized in devices such as voltmeters, ammeters, and multimeters to display accurate readings.
  • Consumer Electronics: Widely used in household appliances like microwaves, ovens, and air conditioners for displaying settings and timings.
  • Medical Devices: Employed in medical equipment for displaying crucial data such as heart rate, blood pressure, and other vital signs.

Benefits of Using an SMD Seven Segment Display

Clarity and Readability: The high brightness and contrast of the smd seven segment display ensure that numbers are easy to read from a distance, enhancing usability in various environments.

Space Efficiency: The compact design of the SMD seven segment display 0.4 inch 4 digit makes it perfect for devices with limited space, allowing for more efficient use of the available area.

Cost-Effectiveness: These displays provide an economical solution compared to other display technologies, making them a cost-effective choice for many applications.

Reliability: With a robust design and long lifespan, these displays offer reliable performance, reducing the need for frequent replacements and maintenance.

Ease of Use: The straightforward configuration of the 1 inch 7 segment display simplifies wiring and integration, making it accessible for both professionals and hobbyists.

Case Studies

Case Study 1: Industrial Equipment Monitoring

A manufacturing company integrated the SMD seven segment display 0.4 inch 4 digit into their equipment monitoring systems. The displays provided clear, real-time data on machine performance, which improved maintenance schedules and reduced downtime by 20%.

Case Study 2: Enhancing Medical Devices

A medical device manufacturer used these displays in their new line of patient monitoring equipment. The clear, bright display of vital signs helped healthcare professionals monitor patients more effectively, leading to improved patient outcomes.

User Testimonials

John S., Electronics Engineer: “I’ve been using the SMD seven segment display 0.4 inch 4 digit in my projects for years. Its reliability and ease of use make it my go-to choice for numeric displays.”

Emily R., Product Designer: “These displays are fantastic for consumer electronics. Our latest product line saw a significant boost in user satisfaction thanks to the clear, bright display.”

Integration with Common Cathode and Common Anode Configurations

The SMD seven segment display 0.4 inch 4 digit is also available in 7 segment display segments configurations, including common cathode and common anode types. This versatility allows for a wide range of applications and simplifies circuit design. Additionally, configurations like the seven segment 4 digit display offer flexibility in circuit design, accommodating various project requirements.


The SMD seven segment display 0.4 inch 4 digit is a versatile and reliable component, ideal for a wide range of applications from industrial equipment to consumer electronics. Its features, including high brightness, durability, and ease of integration, make it an excellent choice for displaying numeric information. Whether you are an electronics manufacturer, engineer, or product designer, this display offers a cost-effective solution to meet your needs.

Call to Action

Ready to enhance your next project with a reliable and clear display? Consider the SMD seven segment display 0.4 inch 4 digit. For more information and to place an order, visit our website or contact our sales team today.

SMD seven segment display 0.4 inch 4 digit
SMD seven segment display 0.4 inch 4 digit


  • Compact 0.40 inch digit height.
  • Single decimal point.
  • Common anode or common cathode.
  • Low current operation.
  • RoHS compliant.


  • Automotive displays.
  • Portable electronics.
  • Medical instruments.
  • Consumer electronics.
  • Fitness trackers.
  • Wearable technology.
  • DIY projects.
  • Industrial instruments.
  • Measurement devices.
  • Temperature controllers.
  • Digital clocks.
Electrical-optical characteristics:
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Part No. (Cathode)
Part No. (Anode)
Emitting Color
Peak Wavelength (nm)
Voltage typ.(v)
Voltage max. (v)
Luminous min
Luminous typ
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Ultra Pure Green
Hi Red
Ultra Red
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Package configuration & Internal circuit diagram
SMD seven segment display 0.4 inch 4 digit

All dimensions are in millimeters(inches)
Tolerance is +-0.25(0.01″) unless otherwise note
Specifications are subject to change without notice.

Partno description:

LED seven segment , called also LED numeric display, is widely applied in home appliance panel display and other application.

Part No of Seven segment LED display

More information

Reflector Surface color (1st number)/ Segment Lens color (2nd number):

Ref Surface ColorWhiteBlackGrayRedGreen 
Epoxy ColorWater clearWhite diffusedRed DiffusedGreen DiffusedYellow Diffused 

Absolute maximum ratings (Ta= 25°C)

Parameter SDUREYGUnit
Forward Current IF 252525252530mA
Power Dissipation Pd 606060606065mW
Reverse Voltage VR 555555V
Peak Forward Current IPF (Duty 1/10 @1KHZ) 150150150150150150mA
Operation Temperature TOPR-40 to +80°C
Storage Temperature TSTG-40 to +85°C
Lead Soldering Temperature TSOL  Max.260+ 5°C for 3 sec Max. ( 1.6mm from the base of the epoxy bulb)°C

Absolute maximum ratings (Ta= 25°C)

Forward Current IF3030303030303030mA
Power Dissipation Pd7565656575110120120mW
Reverse Voltage VR55555555V
Peak Forward Current IPF (Duty 1/10 @1KHZ)150150150150150150100100mA
Operation Temperature TOPR-40 to +80°C
Storage Temperature TSTG-40 to +85°C
Lead Soldering Temperature TSOLMax.260+ 5°C for 3 sec Max. ( 1.6mm from the base of the epoxy bulb)°C
Related Information

Applied for:
dvd player radio train instrument refrigerator

1. Application
The Seven Segment LED is widely applied for ordinary electronic equipment (such as office equipment,
communication equipment and household applications). Checking with BETLUX’s Sales in
advance for information on applications in which exceptional reliability is required, particularly
when the failure or malfunction of the LEDs may directly jeopardize life or health (such as in
aviation, transportation, traffic control equipment, medical and life support systems and safety

2. Storage
The storage ambient for the Seven Segment LED should not exceed 30℃ temperature or 70% relative humidity.
For extended storage out of their original packaging, it is recommended that the Seven Segment LEDs be stored
in a sealed container with appropriate desiccant, or in a desiccator with nitrogen ambient.

3. Cleaning
Avoid using any unspecified chemical solvent to clean LED . For example, Trichloroethylene, Chlorosen, Acetone, and Diflon S3MC.
Any cleaning method can only be taken under normal temperature in one minute or less if it is required.
Use water to clean the Seven Segment LED if necessary under room temperature
dry it immediately after that.

Any unsuitable stress applied to the epoxy may break bonding wires in LED
Any forming on lead pin must be done before soldering, not during or after soldering.
Avoid applying any stress to resin in order to prevent the epoxy fracture and break on bonding wire.
While forming, please use a tie bar cut or equivalent to hold or bend the pin.
2mm from the base of resin is the minimum distance for the place bending the lead pin.
Avoid bending the lead pin at the same point twice or more.

seven segment display forming caution


When soldering, leave a minimum of 2mm clearance from the base of the base of the lens to the soldering point. Dipping the lens into the solder must be avoided.

Do not apply any external stress to the lead frame during soldering while the LED is at high temperature.

Recommended soldering conditions:


IR Reflow Soldering (for SMD display)Wave SolderingSoldering Iron
Pre-Heat150-180°CPre-Heat100°C Max.Temperature300°C Max.
Pre-Heat Time120sec Max.Pre-Heat Time60sec Max.
Peak Temperature260°C Max.SolderWave260°C Max.Soldering Time3sec Max.(one time only)
Soldering Time10 sec Max.Soldering Time5sec Max.

Note: Excessive soldering temperature and/or time might result in deformation of the LED lens or failure of the LED

ESD(Electrostatic Discharge)

Static Electricity or power surge will damage the LED.

Suggestions to prevent ESD (Electrostatic Discharge):

n Use a conductive wrist band or anti-electrostatic glove when handling these LEDs

n All devices, equipment, and machinery must be properly grounded

n Work tables, storage racks, etc. should be properly grounded

n Use ion blower to neutralize the static charge which might have built up on surface of the LED’s

 plastic lens as a result of friction between LEDs during storage and handling

ESD-damaged LEDs will exhibit abnormal characteristics such as high reverse leakage current, 

low forward voltage, or “no light on” at low currents. To verify for ESD damage, check for “light on” 

and Vf of the suspect LEDs at low currents.

The Vf of “good” LEDs should be>2.0V@0.1mA for InGaN product and >1.4V@0.1mA for AlInGaP


antistatic notice-smd led

LED dirve IC by  Maxim Integrated

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 MAX6955  7-, 14-, 16-Segment LED Display Driver

 MAX6956  LED Static Display Driver and I/O Port

 MAX6954  7-, 14-, 16-Segment LED Display Driver

 MAX6952  5 x 7 Matrix LED Display Driver

 MAX6957  LED Static Display Driver and I/O Port

MAX6950  5-Digit LED Display Driver

 MAX6951  8-Digit LED Display Driver

 ICM7212  4-Digit LED Driver

 ICM7212A  4-Digit LED Driver

 ICM7212AM  4-Digit LED Driver

 ICM7212M  4-Digit LED Driver

 ICM7218A  8-Digit LED Driver

 ICM7218B  8-Digit LED Driver

 ICM7218C  8-Digit LED Driver

 ICM7218D  8-Digit LED Driver

 MAX7221  8-Digit LED Display Driver

 MAX7219  8-Digit LED Display Driver

 provide in-depth design and IC selection help for design engineers.  Each solution is dedicated to a popular end-equipment type and features design information, circuits and a block diagram.   Within a block diagram, click on a block to view best-fit integrated circuits recommended by Maxim engineers.

When selecting power for LED systems, it’s essential to understand several key parameters to ensure safe operation, longevity, and optimal performance. Here are some steps and considerations for LED power selection:

  • Determine the Forward Voltage (Vf) of the LED(s):

Each LED has a forward voltage, which is the voltage at which the LED operates when the current is flowing through it. This value can typically be found in the LED’s datasheet.

  • Determine the Forward Current (If) of the LED(s):

The forward current is the current at which the LED is designed to operate. Running an LED at higher than its rated current can reduce its lifespan and increase the heat it produces.

  • Decide on the Configuration:

Series Configuration: When LEDs are connected in series, the forward voltages add up, but the current remains the same.

Parallel Configuration: When LEDs are connected in parallel, the forward voltage remains the same, but the currents add up. This configuration can be risky because if one LED fails or has a slightly lower forward voltage, it can cause the other LEDs to draw more current.

Calculate Total Power Requirements:

Power (W) = Total Forward Voltage (V) x Total Forward Current (A)

For example, if you have three LEDs connected in series, each with a forward voltage of 3V and a forward current of 20mA, the total power requirement would be:

Power = (3V + 3V + 3V) x 20mA = 9V x 0.02A = 0.18W

  • Select an Appropriate Power Supply:
  • Voltage Rating: The power supply voltage should match or slightly exceed the total forward voltage of your LED configuration.
  • Current Rating: The power supply’s current rating should meet or exceed the total forward current of your LED configuration.
  • Safety Margin: It’s a good practice to select a power supply that can provide at least 20% more power than your calculated requirement. This ensures the power supply isn’t operating at its maximum capacity, which can extend its life and ensure safer operation.
  • Consider Additional Features:
  • Dimming Capability: If you want to control the brightness of your LEDs, choose a power supply with dimming capabilities.
  • Overcurrent and Overvoltage Protection: To protect your LEDs, select a power supply with built-in protection mechanisms.
  • Thermal Management: Ensure that the power supply has adequate cooling, especially if it will be enclosed or in a location with limited airflow.
  • Regulation and Efficiency:A power supply with good regulation will maintain a consistent voltage output despite variations in the load. High efficiency ensures minimal power is wasted as heat.
  • Physical Size and Form Factor:Depending on where you plan to place the power supply, its size and shape may be critical factors.

In summary, when selecting power for LED systems, understanding your LED’s requirements and the configuration you plan to use is essential. Then, pick a power supply that meets those needs with some added safety margin, keeping in mind any additional features or constraints relevant to your project.

Here are some well-regarded brands in the industry:

  • Mean Well: One of the most recognized brands in the LED power supply industry, Mean Well offers a wide range of products suitable for both indoor and outdoor applications. Their units often come with features like overcurrent protection, dimming capabilities, and high efficiency.
  • Tridonic: A global leader in lighting technology, Tridonic offers LED drivers and power supplies that cater to various lighting solutions, from simple setups to advanced smart lighting systems.
  • Philips Advance Xitanium: Philips is a well-known brand in the lighting industry, and their Xitanium series of LED drivers are known for reliability and performance. They cater to both indoor and outdoor LED applications.
  • Osram: Another giant in the lighting industry, Osram offers a range of LED drivers and power supplies suitable for various applications, including architectural and street lighting.
  • LIFUD: Specializing in LED drivers, LIFUD is known for its high-quality products that cater to both commercial and residential LED lighting solutions.
  • MOSO: This brand offers a variety of LED drivers, especially for outdoor and industrial applications. Their products are known for durability and performance.
  • TDK-Lambda: With a history in power electronics, TDK-Lambda offers a range of power supplies and LED drivers suitable for various applications, emphasizing reliability and advanced features.
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