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The LD21xx series from Laser Components is a Optical Detector with Responsivity/Photosensitivity 240000 to 280000 V/W, Active Area Diameter 2 mm. More details for LD21xx series can be seen below.
Single Channel Current Mode Differential Pyroelectric Detectors
1 to 3.4 µm Photoconductive Single Element PbS Detectors