The S8664-02K from Hamamatsu Photonics is a Photodiode with Wavelength Range 320 to 1000 nm, Capacitance 0.8 pF, Dark Current 0.1 to 1 nA, Responsivity/Photosensitivity 0.24 A/W, Active Area Diameter 0.2 mm (Photosensitive). More details for S8664-02K can be seen below.