📌 Product Overview
The XINGLIGHT XL-257SYGD-L is a standard 3mm through-hole LED featuring a green water-clear lens and long lead form factor designed for wave soldering processes. 💡 This component is engineered to provide stable luminous intensity with a dominant wavelength range suitable for general indication and backlighting purposes. Target applications primarily include household appliances, automotive instrumentation, and industrial control panels where visual status feedback is required. The device utilizes a die encapsulated in an epoxy resin package that meets ROHS environmental standards.
🚀 Typical Applications
Based on the 2.0V - 2.6V forward voltage range and wide viewing angle, this component is optimized for the following scenarios:
- Status Indication: Power ON/OFF and functional status lights for home appliances and digital communication devices.
- Automotive Electronics: Dashboard indicators and interior lighting (non-critical illumination).
- Industrial Control: Signal towers and electronic teaching equipment requiring clear visual cues.
- Consumer Devices:Electronic toys and clocks where cost-effective, reliable light sources are necessary.
📊 Key Technical Specifications
👇 The table below outlines the critical electro-optical characteristics under standard test conditions (Ta=25°C).
| Parameter | Symbol | Min | Typ. | Max | Unit | Test Conditions |
|---|---|---|---|---|---|---|
| Luminous Intensity | Iv | 50 | - | 100 | mcd | IF = 20mA |
| Dominant Wavelength | λd | 565 | - | 575 | nm | IF = 20mA |
| Peak Wavelength | λp | - | 570 | - | nm | IF = 20mA |
| Forward Voltage | VF | 2.0 | 2.2 | 2.6 | V | IF = 20mA |
| Viewing Angle | 2Ø1/2 | - | 110 | - | deg | IF = 20mA |
| Reverse Current | IR | - | - | ≤10 | μA | VR = 5V |
⚠️ Absolute Maximum Ratings & Process Limits
⚡ Exceeding these ratings may cause device failure or permanent degradation. Design margins must account for these limits.
| Parameter | Symbol | Rating | Unit | Notes |
|---|---|---|---|---|
| Power Dissipation | Pd | 70 | mW | Derate above 25°C ambient |
| Max Continuous Forward Current | IF | 20 | mA | DC operation |
| Peak Forward Current | IFp | 80 | mA | Pulse width ≤ 10ms |
| Operating Temperature | Topr | -20 ~ +85 | °C | Ambient range |
| Storage Temperature | Tstg | -40 ~ +85 | °C | Non-operating |
| Soldering (Wave) | Tsol | 240 | °C | ≤ 6 Seconds duration |
| Soldering (Manual) | Tsol | 300 | °C | ≤ 3 Seconds, >2mm from body |
📦 Package, Dimensions & Assembly Notes
🔒 The XL-257SYGD-L features a standard 3mm (T-1) radial package with dimensions of 5.0mm (Diameter) x 2.0mm (Thickness) and a total length of 28mm including the long leads.
- Physical Structure: The long leads are specifically designed for stability during wave soldering or manual insertion processes.
- Assembly Constraints: Ensure the soldering point maintains a distance of at least 2.0mm from the bottom of the epoxy colloid to prevent thermal damage to the die.
- Moisture Sensitivity: The component is classified at MSL Level 2, requiring proper handling if exposed to ambient humidity for extended periods prior to reflow.
🛒 Sourcing & Supply Considerations
✨ When integrating the XL-257SYGD-L into your BOM, consider the following supply chain factors:
- Consistency Control: Verify voltage grading codes (N12-8 to N13-1) and brightness bins (A1) to ensure uniformity across large production batches.
- Cross-Reference: Confirm lead spacing and lens curvature when evaluating alternatives, as "3mm Green" can vary in viewing angle and intensity.
- Procurement Verification: Always source through authorized channels to guarantee ROHS compliance and avoid counterfeit components that may not meet the specified 70mW power dissipation limits.
❓ Frequently Asked Questions
Q: What is the typical forward voltage drop for this LED? A: The typical forward voltage (VF) is 2.2V, with a maximum of 2.6V at 20mA. Designers should ensure the driving circuit can supply sufficient voltage while utilizing current-limiting resistors to maintain the forward current at or below 20mA.
Q: Can this LED be used in outdoor environments? A: The datasheet specifies an operating temperature range of -20°C to +85°C. While suitable for internal automotive or industrial equipment, the standard epoxy package is generally not rated for prolonged UV exposure or extreme outdoor weather conditions without additional protection.
Q: What are the soldering limits for assembly? A: For wave soldering, the maximum temperature is 240°C for ≤ 6 seconds. For manual welding, the limit is 300°C for ≤ 3 seconds. Crucially, the solder joint must be >2.0mm from the colloid base to prevent heat damage.
Q: How is the brightness graded? A: Luminous intensity is graded as Code A1, covering a range of 50 to 100 mcd. If your application requires consistent brightness across a panel, ensure all procured units share this specific binning code.
Q: What is the moisture sensitivity level (MSL)? A: The XL-257SYGD-L is rated at MSL Level 2. This means it can be exposed to ambient moisture for up to one year (at <30°C/60% RH) before baking is required prior to soldering, making it suitable for standard PCB assembly lines.
