The G12181-010K from Hamamatsu Photonics is a Photodiode with Wavelength Range 0.9 to 1.9 µm, Capacitance 230 to 500 pF, Dark Current 10 to 100 nA, Responsivity/Photosensitivity 0.9 to 1.1 A/W, Active Area Diameter 1 mm. More details for G12181-010K can be seen below.