The G12180-020A from Hamamatsu Photonics is a Photodiode with Wavelength Range 0.9 to 1.7 µm, Capacitance 250 to 800 pF, Dark Current 1.5 to 7.5 nA, Responsivity/Photosensitivity 0.8 to 1.1 A/W, Active Area Diameter 2 mm. More details for G12180-020A can be seen below.