The 521-9452F is a yellow 2mm x 5mm rectangular discrete LED with a tinted, diffused lens designed for indicator and status display applications. It features a peak wavelength of 583 nm and delivers a typical luminous intensity of 3.5 mcd at 20 mA forward current, with a viewing angle of 110°. The device has a maximum forward current rating of 20 mA, a typical forward voltage of 2.1 V at 20 mA, and a maximum power dissipation of 85 mW. Operating over a temperature range of -55°C to +100°C with a derating factor of 0.34 mA/°C from 50°C, this LED is suitable for panel indicators, status lights, and general-purpose signaling in consumer and industrial equipment where reliable, long-life illumination is required.