The IG22X1000S4i from Laser Components is a Photodiode with Wavelength Range Cut off Wavelength: 2.2 µm, Capacitance 650 pF, Dark Current 0.2 to 2.5 nA, Responsivity/Photosensitivity 0.1 to 1.9 A/W, Active Area Diameter 1000 µm. More details for IG22X1000S4i can be seen below.