These are Common-Anode type which means you connect one pin to 5V or so and then tie the other three legs to ground through a resistor. We carry and use CA more than CC because multi-LED driver chips (such as the TLC5940/TLC5941) are often designed exclusively for CA and can't be used with Common-Cathode.
- 5mm diameter
- Red: 630 nm wavelength, Green: 525 nm, Blue: 430 nm
- Red: 2.1-2.5V Forward Voltage, at 20mA current, Green: 3.8-4.5V, Blue: 3.8-4.5V
- Red: 500 mcd typical brightness, Green: 600 mcd, Blue: 300 mcd
- BL-L515RGBW-CA Datasheet