The G12180-050A from Hamamatsu Photonics is a Photodiode with Wavelength Range 0.9 to 1.7 µm, Capacitance 1000 to 7000 pF, Dark Current 5 to 25 nA, Responsivity/Photosensitivity 0.8 to 1.1 A/W, Active Area Diameter 5 mm. More details for G12180-050A can be seen below.