The 521-9201F is a 5 mm discrete LED lamp designed for circuit board through-hole indicator applications. It features a single-coat tinted non-diffused lens with a 30-degree viewing angle and operates at a test current of 20 mA. The device has a forward current rating of 30 mA continuous and 120 mA pulse, with a reverse voltage rating of 5 V and a peak wavelength of 565 nm (yellow-green). Operating across a wide temperature range from -55°C to +100°C, this indicator lamp is suitable for panel-mounted and circuit board applications requiring reliable visual feedback in industrial and consumer electronics.