Advanced Photonix offers a series of photodiodes which include the compact 1206-package device 0090-3111-185. This device’s datasheet indicates that its active area is off-center in the device, biased towards the cathode end of the part. Is this correct?
This part does indeed have an off-center active area. This is intentional and not a product defect; it’s a result of the design process for the chip. Unfortunately the supplier does not provide precise measurements for the position of the active area within the device. If precise positioning of the active area is important to your application, we recommend testing and adjusting your design prior to full production.