Did you know?
On October 7, 2014, the Nobel Prize in Physics was awarded to Isamu Akasaki, Hiroshi Amano andShuji Nakamura for “the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources” or, less formally, LED lamps.
LED: There are different types of LEDS. LEDS in general – Surface mount devices (SMD) are more common than ever thanks to miniaturisation. LEDs inside disk drives, modems, and small personal electronic devices are more often SMD devices these days. Most of the size of a 5mm or 3mm indicator LED is the epoxy package–the actual LED junction is quite small. With SMD LEDs, you don’t get much extra packaging, just the glowing bits. Without the epoxy package focusing the beam, they tend to have wide viewing angles, and are often used with light pipe in a device.
SMD LEDs are available in four sizes, which are designated 1206, 0805, 0603 and 0402 . 0402 is the smallest, with overall package size of 1.0 mm x 0.5 mm x 0.45 mm (L x W x H). Then 0603 at 1.6 mm x 0.8 mm x 0.6 mm. 0805 are slightly larger, at 2.0 mm x 1.25 mm x 0.8 mm. 1206 are the big brothers of the family, at 3.2mm x 1.5 mm x 1.1 mm.