AT-7802A is an amorphous silicon solar cell manufactured by Panasonic for outdoor lighting and power generation applications. Operating at 4.0V with a short-circuit current of 29.7 mA under 100 mW/cm² AM-1.5 standard test conditions at 25°C, the cell delivers a maximum power output of 127 mW at 4.8V and 26.4 mA. The device features a temperature coefficient of -0.3%/°C for open-circuit voltage and 0.08%/°C for short-circuit current, ensuring stable performance across varying environmental conditions. With external dimensions of 73.0 × 42.0 × 0.3 mm and a weight of 4.0 g, this solar cell is well-suited for portable outdoor power applications, solar-powered watches, and low-power outdoor lighting systems where compact form factor and reliable energy conversion are essential.