📌 Product Overview
The XL-3216UBC-FB is a standard 1216 metric (3.2x1.6mm) Surface Mount Device (SMD) LED from XINGLIGHT, utilizing a clear water-clear lens for high-intensity blue light emission. 💡
Targeting indicator lights and keypad backlighting, this component is a critical choice for consumer electronics and industrial panels. For engineers, the selection variables extend beyond simple illumination; wavelength consistency (460-475nm) and forward voltage (Vf) grouping are the decisive factors for maintaining visual uniformity across mass-produced batches. It is a non-specific "commodity" LED, requiring strict inbound binning verification to avoid "patchy" lighting effects.
🎯 Typical Applications & Design Context
Based on its 120° viewing angle and moderate luminous intensity (80-240 mcd), this component fits scenarios requiring wide diffusion rather than focused projection:
- Industrial Control Panels: Utilized for status indication on instrument dashboards where wide-angle visibility is crucial.
- Consumer Appliances & Smart Home: Integrated into white goods (e.g., washing machines, AC units) and router LED indicators for power/status display.
- Automotive Interior: Suitable for non-critical dashboard backlighting and button illumination (cabin temperature range fits standard specs).
- Why it fits: The water-clear colloid maximizes light output efficiency, while the standard MSL 3 rating makes it compatible with conventional SMT lines without extreme drying overhead, provided standard handling procedures are followed.
📊 Key Technical Specifications
Focus on these performance windows for your BOM (Bill of Materials) validation:
| Parameter | Symbol | Min / Typ / Max | Unit | Condition | Engineering Note |
|---|---|---|---|---|---|
| Peak Wavelength | λp | 465 (Typ) | nm | IF=20mA | Defines the "Blue" hue (Cyan-blue to Royal-blue). |
| Dominant Wavelength | λd | 460 - 475 | nm | IF=20mA | Critical for color matching. |
| Luminous Intensity | Iv | 80 / 240 (Max) | mcd | IF=20mA | Brightness Binning D2-D6. Verify bin code for uniformity. |
| Forward Voltage | Vf | 2.6 - 3.4 | V | IF=20mA | Vf Binning M18-8 to M19-6. Affects driver design. |
| Viewing Angle | 2Ø1/2 | 120 | deg | IF=20mA | Wide diffusion suitable for indicators, not spotlights. |
| Half Wave Width | Δλ | 25 | nm | IF=20mA | Standard spectral width for blue chips. |
⚠️ Absolute Maximum Ratings & Process Limits
Exceeding these parameters will cause immediate irreversible damage or latent failure.
| Parameter | Symbol | Max Value | Unit | Failure Consequence (E-E-A-T Insight) |
|---|---|---|---|---|
| Max Forward Current | IF | 20 | mA | Thermal Runaway: Driving >20mA without adequate heat sinking will degrade the phosphor/epoxy and shift wavelength. |
| Peak Pulse Current | IFP | 80 | mA | Bond Wire Damage: Ensure pulse width ≤0.1ms and duty cycle ≤1/10. Longer pulses melt the internal bonding. |
| Reverse Voltage | VR | 5 | V | Junction Breakdown: Exceeding 5V reverse bias (e.g., during ESD or incorrect driver polarity) destroys the PN junction. |
| ESD Tolerance | ESD | 2000 | V | Latent Defects: 2kV is relatively low. Strict ESD control (wrist straps, ionizers) is mandatory during assembly. |
| Operating Temp | TOPR | -40 ~ +85 | °C | Luminous Drop: Light output decreases significantly as ambient temp approaches +85°C. |
| Soldering Temp | TSOL | 260 | °C | Delamination: Exposure >6 seconds at 260°C causes package cracking or lens clouding. |
🚨 Critical Process Risk: The datasheet specifies MSL (Moisture Sensitivity Level) 3.
- Floor Life: 168 hours (1 week) after opening the sealed bag.
- Failure Mode: "Popcorning" (internal cracking) during reflow if baked improperly. If floor life is exceeded, baking at 80±5°C for 24 hours is required prior to SMT.
🧩 Package, Dimensions & Assembly Notes
- Package Type: 3216 (Imperial size 1206). Dimensions: 3.2 (L) x 1.6 (W) x 0.8 (H) mm.
- Soldering Profile: Compatible with standard Reflow Soldering.
- Lead-Free: Max 255°C (Peak) / 5-10s above 217°C.
- Leaded: Max 235°C (Peak) / 10-15s above 183°C.
- Placement: Standard pick-and-place nozzles for 1206 packages apply.
- Visual Inspection: The "Water Clear" (transparent) lens can sometimes make optical alignment verification difficult under automated AOI (Automated Optical Inspection) if the lighting angle creates glare. Ensure AOI lighting is optimized for clear LEDs.
🔍 Procurement & Sourcing Insights
This is a high-volume, standard-commodity component. Supply chain stability relies on bin management.
- Binning Consistency (Critical): The datasheet lists Brightness Binning (D2-D6) and Voltage Binning (M18-8 to M19-6).
- Risk: A supplier switching bins between batches will cause visible brightness differences or current draw variations on the same PCB.
- Action: Always specify the exact Bin Code (e.g., "Supply D4 Brightness, M19-1 Voltage") on your purchase order. Do not accept "random bin" shipments.
- Alternative Validation:
- This is a standard 1216 (1206) footprint. Alternatives from major brands (Everlight, Lite-On, Nicha) are electrically compatible but check the Lens Height.
- The XL-3216UBC-FB has a low profile (0.8mm). Some alternatives may be taller (e.g., 1.0mm+), causing mechanical interference with neighboring components or enclosure fit.
- Anti-Counterfeiting:
- Commodity LEDs are prone to "mixing bins" (re-labeling lower brightness chips as higher grade) in the open market. Procurement should request the original Lab Test Report (COA) showing the specific wavelength and Vf distribution for the lot.
❓ FAQ
Q: Can I drive this LED at 30mA for higher brightness?
A: No. The datasheet limits continuous forward current (IF) to 20mA. While it may light up at 30mA, the junction temperature will rise exponentially, leading to rapid lumen depreciation and premature failure. If you need more light, choose a higher-binned part (e.g., D6) or a larger package (3528/5050), rather than overdriving.
Q: What does "MSL Level 3" mean for my SMT line?
A: It means the LED is sensitive to moisture. You have 168 hours (1 week) to use the components after opening the vacuum-sealed bag before they must be baked. If you don't use them in time, the trapped moisture will turn to steam during reflow, cracking the component internally (popcorning).
Q: How important is the Voltage Binning (M18-8 vs M19-6)?
A: It depends on your driver circuit. If you are using a simple resistor limiting constant voltage, a large variation in Vf will cause a large variation in brightness. For mass production uniformity, locking the Vf bin (e.g., all M19-1) is highly recommended to ensure every unit looks the same.
Q: Is this LED suitable for outdoor use?
A: Not as-is. While the storage and operating temperatures support -40°C to +85°C, this component is not rated for UV exposure or water ingress (IP rating). For outdoor use, it must be housed in a sealed, water-proof light guide or enclosure with UV-stable plastic.
