Through hole LED
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Datasheet Inquiry
Description:
3mm LED Diode with 38mm Long Leads – Compact Indicator LED for Deep Panels & Precision Mounting
The 3mm LED diode with 38mm long leads is a compact, high-brightness indicator designed for applications where standard short-lead LEDs cannot reach. Its extended 38mm lead length enables effortless installation through thick or multi-layer panels, mechanical housings, offset PCB mounting, and custom wiring layouts.
This LED is widely used by electronics manufacturers, engineers, and equipment designers who need a dependable and flexible through-hole indicator for industrial, commercial, and consumer electronic devices.
With excellent brightness, low power consumption, and precision-formed long pins, this LED provides consistent performance in both high-volume production and custom prototype applications.
⭐ Key Features
1. Compact 3mm Round LED Package
The classic 3mm LED diode format is ideal for tight spaces and high-density PCBs.
Benefits include:
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Small footprint
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Precise, focused light output
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Compatibility with a wide range of indicator housings
2. Extra-Long 38mm Leads
The standout feature of this device is its 38mm extended lead length, providing unmatched installation flexibility:
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Easily passes through thick plastic or metal panels
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Suitable for hand-bent shaping and offset mounting
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Allows front-panel indication even when PCBs are placed deep inside equipment
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Perfect for breadboards and prototyping setups
These long leads prevent the need for additional wiring or adapters.
3. Multiple Lens Options
Available in:
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Water clear
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Diffused
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Color-tinted clear
Each lens option supports different lighting requirements—from high-intensity brightness to soft, uniform glow.
4. High Brightness, Low Current
Advanced LED chips deliver:
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Strong illumination
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Low energy consumption
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Compatibility with microcontrollers, driver ICs, and low-voltage circuits
Ideal for battery-powered devices or low-power systems.
5. Durable, High-Quality Build
Made from:
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Heat-resistant epoxy resin
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Corrosion-protected extended leads
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Shock-resistant lens structure
Ensuring long life even in demanding applications.
6. Fully ROHS-Compliant
Meets environmental and international safety standards for global production and export.
⭐ Applications
The 3mm LED diode with 38mm long leads is engineered for installations requiring extra reach or flexible mounting geometry.
✔ Industrial Control Equipment
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Status indicators
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Warning lights
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Machine monitoring
Long leads allow LEDs to reach through metal enclosures and protective housings.
✔ Consumer Electronics
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Home appliances
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Compact displays
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Portable devices
The 3mm size fits compact designs while offering strong visibility.
✔ Telecommunications
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Signal indication
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Network equipment status lights
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Panel-mounted interface indicators
✔ Automotive & Transportation Electronics
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Dashboard add-ons
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Internal indicator modules
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Custom switches
✔ R&D Labs and Prototyping
Ideal for:
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Breadboards
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Rapid wiring
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Testing circuits
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Adjustable positioning
The long leads are easy to bend without breaking.
⭐ Benefits & Advantages
✔ Greater Mechanical Flexibility
38mm long leads provide extended reach, making this LED suitable for:
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Thick panels
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Deep chassis mounting
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Multi-board assemblies
✔ Improved Heat Dissipation
The longer pins act as mini heat spreaders, improving thermal stability.
✔ Easier Handling & Assembly
Extra lead length allows:
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Convenient soldering
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Firm gripping during assembly
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Customized lead shaping
✔ High Reliability in Harsh Environments
The LED maintains consistent brightness and reliability across:
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Temperature variations
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Mechanical stress
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Continuous operation
✔ Ideal for Low-Current Applications
Maintains strong visibility even with energy-saving designs.
⭐ Case Study: Control Panel OEM
A European manufacturer building compact control stations required LEDs that could pass through a 15–20mm thick aluminum front panel while the PCB sat deep inside the enclosure.
Standard LEDs were too short, requiring costly extensions and manual wiring. After switching to the 3mm LED diode with 38mm long leads, they achieved:
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40% faster assembly time
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No more custom lead extensions
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Higher consistency in LED alignment
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Reduced wiring errors
This upgrade significantly improved their production efficiency.
⭐ User Testimonials
Electronics Engineer – Germany
“These 3mm LEDs with 38mm leads solved all our deep-panel mounting issues. Easy to solder and very reliable.”
DIY Prototyper – USA
“Perfect for breadboard layouts and custom projects. The long leads make shaping and alignment simple.”
Industrial Equipment Maker – Singapore
“Excellent brightness and durable pins. Works flawlessly even in high-vibration control cabinets.”
⭐ Conclusion
The 3mm LED diode with 38mm long leads is a compact yet powerful indicator LED designed for engineering flexibility. With superior brightness, extended leads, and exceptional mounting freedom, it is an ideal choice for industrial control systems, deep panel designs, custom electronics, and prototyping environments.
If your project demands a small LED with long reach, stable performance, and easy installation, this model is one of the best solutions available.
Electrical-optical characteristics:
Package configuration & Internal circuit diagram
Obtain 3D specification files
Initial Graphics Exchange Specification (.IGS)Standard for the Exchange of Product Model Data (.STEP)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:
LEDs, Light Emitting diodes, which include various small kinds, such as 3mm, 5mm, 8mm, 10mm; round type, rectangular type square type, tower type, Oval led, elliptical, flat top; SMDs, high power led, piranha LEDs
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.
