The G15553-005C from Hamamatsu Photonics is a Photodiode with Wavelength Range 0.9 to 1.7 µm, Capacitance 15 to 20 pF, Dark Current 0.15 to 0.75 nA, Responsivity/Photosensitivity 0.8 to 1.1 A/W, Active Area Diameter 0.5 mm. More details for G15553-005C can be seen below.
