2. Article Body
📌 Product Overview
The XINGLIGHT XL-257UBC-L is a standard 3mm radial leaded LED featuring a blue luminous chip encapsulated in a water-clear colloid. 📐 Designed with a 5.0mm diameter and a long leg structure (28mm total length), it facilitates easy integration into PCBs and manual assembly processes. This component is specifically engineered for applications requiring clear visual indication or decorative illumination where SMT alternatives are not feasible.
💡 The device operates efficiently at a low DC drive voltage, making it suitable for battery-powered consumer goods. It adheres to RoHS environmental standards, ensuring compliance with global electronic waste regulations. Its primary design focus balances luminous efficacy with physical durability across a wide operating temperature range.
🚀 Typical Applications
Based on the electrical characteristics and mechanical dimensions, the XL-257UBC-L is optimized for the following scenarios:
- Consumer Electronics & Indication: Status indicators for home appliances (AC, washing machines) and communication devices.
- Automotive Interior: Dashboard illumination and control panel backlights (non-critical lighting).
- Digital & Educational Equipment: Display backlights for electronic clocks, digital instruments, and teaching aids.
- Decorative Lighting: Urban lighting projects and electronic toys requiring diffused or point-source blue light.
- Medical Instruments: Indicator lights for beauty and medical diagnostic devices.
📉 Key Technical Specifications
The following table outlines the optoelectronic parameters under standard test conditions (Ta=25°C).
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Test Conditions |
|---|---|---|---|---|---|---|
| Luminous Intensity | Iv | 100 | - | 400 | mcd | IF = 20mA |
| Dominant Wavelength | λd | 455 | - | 470 | nm | IF = 20mA |
| Peak Wavelength | λp | - | 465 | - | nm | IF = 20mA |
| Forward Voltage | VF | 2.8 | 3.0 | 3.4 | V | IF = 20mA |
| Viewing Angle | 2Ø1/2 | - | 110 | - | deg | IF = 20mA |
| Spectral Width | △λ | - | 30 | - | nm | IF = 20mA |
| Reverse Current | IR | - | - | ≤10 | μA | VR = 5V |
⚠️ Note: Tight binning codes are applied for brightness (A8, A9, B1), voltage (N13-3 to 5), and wavelength (HB03-05) to ensure batch consistency.
⚡ Absolute Maximum Ratings & Process Limits
Exceeding these ratings may cause permanent device failure or degradation. 🔒 Design margins must account for these absolute limits.
| Parameter | Symbol | Rating | Unit | Notes |
|---|---|---|---|---|
| Power Dissipation | Pd | 70 | mW | Derate above 25°C ambient |
| Max Forward Current | IF | 20 | mA | Continuous operation |
| Peak Forward Current | IFp | 80 | mA | Pulse width dependent |
| Operating Temperature | Topr | -20 ~ +85 | °C | Ambient range |
| Storage Temperature | Tstg | -40 ~ +85 | °C | Moisture Level: 2 (MSL) |
| Soldering (Wave) | Tsol | 240 | °C | Max 6 seconds duration |
| Soldering (Manual) | Tsol | 300 | °C | Max 3 seconds at ≥2mm from body |
📦 Package, Dimensions & Assembly Notes
- Package Type: 3mm Round Radial Lead (T-1 standard).
- Dimensions: The lens diameter is 5.0mm with a total length of 28mm. Tolerances are generally ±0.50mm unless specified.
- Assembly: The long leads are ideal for wave soldering or manual insertion. ⚠️ Ensure the soldering point is at least 2.0mm away from the epoxy body base to prevent thermal damage.
- Packaging: EIA standard compliant, shipped in moisture-proof and anti-electrostatic foil bags to maintain MSL 2 integrity.
🤝 Sourcing & Supply Considerations
- Binning Availability: Verify stock availability for specific luminosity (A8-B1) and voltage (N13) bins to match your circuit design.
- Samples: Request pre-production samples to validate color consistency and intensity in your specific optical enclosure.
- Authenticity: Source through authorized channels to guarantee RoHS compliance and avoid counterfeit components with inconsistent forward voltage drops.
- Lead Time: This standard product typically offers stable logistics, but volume requirements should be communicated early to secure specific bin grades.
❓ FAQ
Q: What is the forward voltage range for this LED? A: The forward voltage (VF) ranges from a minimum of 2.8V to a maximum of 3.4V at 20mA. It is categorized into three grading codes: N13-3 (2.8-3.0V), N13-4 (3.0-3.2V), and N13-5 (3.2-3.4V).
Q: Can this LED be used in outdoor environments? A: While the operating temperature supports -20°C to +85°C, the package is not rated for IP67 or higher water ingress. It is suitable for internal indicators or protected outdoor fixtures but not direct exposure to rain or UV without sealing.
Q: What are the soldering limits to prevent damage? A: For wave soldering, do not exceed 240°C for more than 6 seconds. For manual welding, the limit is 300°C for 3 seconds. Crucially, the heat application point must be at least 2.0mm away from the LED body base.
Q: How is brightness consistency controlled? A: XINGLIGHT uses brightness grading codes. Code A8 covers 100-200 mcd, A9 covers 200-300 mcd, and B1 covers 300-400 mcd. Selecting a specific bin code ensures uniform appearance across the panel.
Q: Is this component RoHS compliant? A: Yes, the XL-257UBC-L is an environmental protection product that meets ROHS requirements, ensuring it is free from hazardous substances above threshold limits.
