When sourcing LED strips on Alibaba.com, you'll frequently encounter product listings specifying SMD 2835, SMD 5050, or SMD 3528. These numbers aren't arbitrary codes - they represent the physical dimensions of the LED chip in millimeters. Understanding this basic fact is the foundation for making informed configuration decisions.
The naming convention is straightforward: the first two digits represent length, the last two represent width. So a 3528 chip measures 3.5 millimeters by 2.8 millimeters, while a 5050 chip is a square 5.0mm x 5.0mm. This physical difference has profound implications for brightness output, power consumption, heat dissipation, and ultimately, application suitability.
Beyond size, these chips differ in internal structure. The 3528 typically contains one LED diode, making it the simplest and most cost-effective option. The 5050 houses three LED diodes in one package, which enables both higher brightness output and RGB color mixing capabilities. The 2835 represents newer technology with improved thermal management and higher luminous efficiency per watt consumed [3][5].
SMD Chip Physical Specifications Comparison
| Chip Type | Dimensions (mm) | Diodes per Chip | Typical Power (W) | Brightness Range (lumens) | Technology Generation |
|---|---|---|---|---|---|
| SMD 3528 | 3.5 x 2.8 | 1 | 0.08 - 0.10 | 6 - 8 | Legacy (Most Established) |
| SMD 5050 | 5.0 x 5.0 | 3 | 0.24 | 15 - 22 (60+ RGB) | Standard (RGB Capable) |
| SMD 2835 | 2.8 x 3.5 | 1 | 0.20 | 20 - 24 | Advanced (Higher Efficiency) |

