The IG26X500S4i from Laser Components is a Photodiode with Wavelength Range Cut off Wavelength: 2.45 µm, Capacitance 140 pF, Dark Current 4 to 25 nA, Responsivity/Photosensitivity 0.7 to 1.36 A/W, Active Area Diameter 500 µm. More details for IG26X500S4i can be seen below.