The 521-9181F is a 5 mm discrete red LED lamp from Dialight's Series 521, featuring a diffused lens configuration designed for single-color indicator applications. It utilizes GaAsP/GaP LED technology with a typical luminous intensity of 12.3 mcd at 20 mA test current and a minimum intensity of 3.5 mcd, providing reliable visibility in various lighting conditions. The device is rated for a maximum forward current of 40 mA with a maximum power dissipation of 80 mW, and operates reliably across a wide temperature range from -55°C to +100°C. This LED is ideal for panel indicators, status displays, and general-purpose signaling applications where a compact, cost-effective light source is required, and it is RoHS compliant for environmentally conscious designs.