1.6mm SMD LEDS optimised for 2mA operation in industry

“In recent years, technological advancements have resulted in dramatically improved luminous efficiency”, according to the company. “At the same time, the market is demanding LEDs tailored to characteristics in the low current range.”

It argues that LED optimised for standard 20mA operation shift colour when operated at 2mA, and do not all drop to the same intensity (see graphs).

“CSL1901 series reduces visual variations in brightness and colour under low-light conditions by optimising light emission at 2mA using original device technology, ” said Rohm. The new “LEDs reduce brightness variations by half and colour sifting by 3nm.

There are two reds (620 and 630nm, some would call these red-orange) an orange, a yellow and a yellow-green (see table below for characterisitcs).

All are AlGaInP diodes and include a 1.1 x 0.8mm milky white resin diffuser (image right).

Typical forward voltage for all of them is 1.8V at 2mA, maximums are 20mA (25°C) or 44mW, and operation is over -40 to +85°C.

Maximum reverse voltage is 5V (leakage 10μA).

Applications are foreseen as indicators and implementing seven segment numeric displays in factory automation – programmable logic controllers for example, and in communication equipment such as modems and routers.

The product leaflet can be found here, and they can be purchased through Digi-Key, Mouser or Farnell.