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Description:
“Precision Performance in Compact Design: The Power of LED SMD 4040 Side View”
Introduction
In the evolving landscape of modern electronics and lighting design, the LED SMD 4040 stands out as a highly efficient and compact illumination solution. Engineered with advanced surface mount LED technology, this diode delivers outstanding brightness and reliability in applications where precision, space efficiency, and consistent performance are crucial.
The LED SMD 4040 is specifically designed as a side view LED, providing lateral light emission ideal for applications that demand uniform edge lighting, slim backlight systems, or compact visual indicators. This innovative design approach enables manufacturers to achieve more efficient light distribution in smaller footprints, making it an indispensable component across industries such as consumer electronics, automotive, and industrial equipment.
The integration of SMD type LED packaging ensures superior heat dissipation, low power consumption, and long-lasting performance, aligning with global trends toward energy-efficient and sustainable electronic systems.
Features of the LED SMD 4040 Side View
The LED SMD 4040 combines robust engineering and advanced optics to deliver excellent illumination across diverse environments. Its side-emitting design offers flexibility for designers looking to achieve targeted lighting effects while maintaining a sleek, compact form.
Key Features Include:
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Compact Form Factor (4.0 x 4.0 mm):
The small size of the LED SMD 4040 makes it suitable for dense PCB layouts or compact devices that require high brightness. -
Side Emission Illumination:
As a side view LED, it emits light horizontally, providing uniform brightness in thin or edge-lit systems such as displays or decorative strips. -
High Luminous Intensity:
Engineered with optimized chip design, this SMD type LED delivers excellent brightness even at low voltage operation. -
Superior Thermal Management:
The surface mount LED structure ensures efficient heat dissipation, maintaining brightness stability and prolonging lifespan. -
Energy Efficiency:
The diode consumes less power while achieving superior light output, making it suitable for battery-powered or energy-conscious designs. -
Enhanced Reliability:
With a stable epoxy resin housing and anti-static protection, the LED SMD 4040 offers durability even in challenging environments. -
Versatile Color Options:
Available in single and RGB color variations, allowing for flexible integration in design-oriented projects.
Applications of LED SMD 4040
Thanks to its versatility and compactness, the LED SMD 4040 finds applications across numerous industries. Its side view LED configuration and energy-efficient design make it ideal for illumination, signage, and display solutions.
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Consumer Electronics:
Commonly used in smartphones, remote controls, and keypads for backlighting or indicator purposes. The side emission provides sleek, even illumination without increasing device thickness. -
Automotive Lighting:
The LED SMD 4040 is ideal for dashboard indicators, ambient lighting, and side mirrors. Its surface mount LED build ensures shock resistance and long-term stability. -
Industrial Equipment:
Incorporated into control panels and machine indicators, the SMD type LED offers reliable performance under continuous operation. -
Digital Signage & Display Systems:
The side view LED design is particularly effective in edge-lit signs, digital clocks, and advertising displays that demand uniform brightness. -
Medical Devices:
Compact and stable, the LED SMD 4040 ensures consistent illumination for medical panels, portable equipment, and diagnostic instruments. -
Architectural & Decorative Lighting:
Used in linear strips or accent lighting systems to create seamless edge illumination and vibrant visual effects. -
IoT Devices & Smart Home Systems:
Integrated into surface mount LED modules for smart lighting, indicators, and visual feedback systems.
Benefits of LED SMD 4040 Side View
The LED SMD 4040 offers numerous technical and practical benefits that make it an industry standard for both performance and design flexibility.
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Precision Light Control:
The side-emitting structure directs light exactly where it’s needed, reducing waste and improving optical efficiency. -
Compact and Lightweight:
Perfect for miniaturized circuits or sleek product designs without compromising on brightness or color accuracy. -
Energy Efficiency:
The low-power design contributes to sustainable manufacturing goals and reduces operational costs. -
Long Operating Life:
Advanced materials and heat-resistant construction allow for continuous use with minimal degradation. -
Enhanced Aesthetics:
Ideal for applications that demand hidden light sources or seamless integration into thin panels. -
Reliable Performance:
As a surface mount LED, it ensures stable operation even under high vibration or environmental stress. -
Eco-Friendly Construction:
The SMD type LED contains no hazardous materials and complies with RoHS environmental standards.
Case Studies: Practical Applications
Case Study 1 – Automotive Dashboard Illumination (Germany):
An automotive manufacturer adopted the LED SMD 4040 for dashboard and interior lighting. The side view LED configuration improved readability while maintaining a slim design. The result was enhanced driver experience and 30% lower power consumption compared to traditional LEDs.
Case Study 2 – Consumer Display Devices (Japan):
A consumer electronics company integrated SMD type LEDs into compact control panels and smart displays. The surface mount LED form allowed easy PCB assembly, reducing production time and ensuring uniform light distribution across multiple product lines.
Case Study 3 – Industrial Control Panels (USA):
Industrial automation systems incorporated the LED SMD 4040 as indicator lights in control units. With improved durability and low maintenance requirements, productivity increased, and system downtime was reduced by 20%.
User Testimonials
Michael Stevens, Lighting Engineer (USA):
“The LED SMD 4040 is one of the most reliable side-emitting LEDs we’ve tested. It provides excellent brightness in compact spaces without overheating.”
Anna Li, Product Developer (China):
“Using SMD type LEDs in our consumer products has simplified our assembly process. The 4040 model offers perfect light uniformity for our display panels.”
James O’Connor, Automotive Design Specialist (UK):
“We rely on the surface mount LED 4040 for all dashboard applications. It’s durable, efficient, and delivers consistent brightness even under extreme conditions.”
Conclusion
The SMD LED 4040 Side View exemplifies precision engineering and advanced lighting design. Compact yet powerful, the LED SMD 4040 offers outstanding performance, efficiency, and flexibility across multiple applications—from automotive interiors to consumer electronics and industrial systems.
With its surface mount LED architecture and energy-efficient design, it provides high brightness, low heat output, and a long operational lifespan. Its side view LED structure enables seamless integration into thin and space-limited products while maintaining exceptional optical clarity.
As industries continue to push the limits of design and functionality, the SMD type LED 4040 remains a go-to component for professionals seeking reliability, quality, and innovation in one efficient package.

Features:
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- Compact size: 4mm x 4mm x 3.6mm
- Side-emitting design
- Ultra Brightness for enhanced visibility
- Compatible with automatic placement equipment
- Wide Viewing Angle for versatile applications
- Ideal for Backlighting and Indicator purposes
- Package includes 2000 pieces on a reel
- RoHS Compliance for environmental considerations
Applications:
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- Backlighting for compact electronic displays
- Indicator lights in tight spaces
- Illumination in small electronic devices
- Automotive lighting applications
- Wearable technology
- Low-profile lighting solutions
- Space-constrained electronic designs

Electrical-optical characteristics:
Package configuration & Internal circuit diagram
Obtain 3D specification files
To examine all 3D specifications, save the files to your local drive and open them with your 3D application.
Lens colors in 3D files are solely for visual representation; consult the Datasheet for accurate lens type and color information.
In the event of a mismatch, the dimensions in the datasheet take precedence over the 3D specifications.

All dimensions are in millimeters(inches)
Tolerance is +-0.25(0.01″) unless otherwise note
Specifications are subject to change without notice.
Partno description:
More Information
Lens Color:
| Code | D | T | C | W | E | |
| Meaning | color Diffused | Color Tinted | Water Clear | Water Diffused | Orange diffused |
Absolute maximum ratings (Ta=25°C)
| Parameter | SR | LR | UR | UE | UY | UG | PG | BG | B | UB | UV | W | Unit |
| Forward Current I F | 25 | 25 | 25 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | mA |
| Power Dissipation P d | 60 | 60 | 60 | 65 | 65 | 75 | 110 | 110 | 120 | 120 | 120 | 120 | mW |
| Reverse Voltage V R | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | V |
| Peak Forward Current I PF (Duty 1/10 @1KHZ) | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 100 | 100 | 100 | 100 | 100 | mA |
| Operation Temperature T OPR | -40 to +80 | °C | |||||||||||
| Storage Temperature T STG | -40 to +85 | °C | |||||||||||
| Lead Soldering Temperature T SOL | Max.260+-5°C for 3 sec Max. (1.6mm from the base of the epoxy bulb) | °C | |||||||||||
Related Information
Applied for:




The LEDs described here are intended to be used for ordinary electronic equipment (such as office equipment,
communication equipment and household applications). Consult 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 devices).
CAUTIONS for Through-Hole LED Lamps
1. Application
The LEDs described here are intended to be used for ordinary electronic equipment (such as office equipment, communication equipment and household applications). Consult 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 devices).
2. Storage
The storage ambient for the LEDs should not exceed 30℃ temperature or 70% relative humidity. It is
recommended that LEDs out of their original packaging are used within three months
For extended storage out of their original packaging, it is recommended that the LEDs be stored in a sealed
container with appropriate desiccant or in a desiccator with nitrogen ambient.
3. Cleaning
Use alcohol-based cleaning solvents such as isopropyl alcohol to clean the LED if necessary
4. Lead Forming & Assembly
During lead forming, the leads should be bent at a point at least 3mm from the base of LED lens. Do not use
the base of the leadframe as a fulcrum during forming.
Lead forming must be done before soldering, at normal temperature.
During assembly on PCB, use minimum clinch force possible to avoid excessive mechanical stress.


Soldering
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 Soldering | Soldering Iron | |||
| Pre-Heat | 150-180°C | Pre-Heat | 100°C Max. | Temperature | 300°C Max. |
| Pre-Heat Time | 120sec Max. | Pre-Heat Time | 60sec Max. | ||
| Peak Temperature | 260°C Max. | SolderWave | 260°C Max. | Soldering Time | 3sec Max.(one time only) |
| Soldering Time | 10 sec Max. | Soldering Time | 5sec 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
product.

Drive Method
An LED is a current-operated device. In order to ensure intensity uniformity on multiple LEDs connected in
parallel in an application, it is recommended that a current limiting resistor be incorporated in the drive circuit,
in series with each LED as shown in Circuit A below.

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.





