VS1838B IR Receiver
The VS1838B is a PIN photodiode high-gain amplifier IC in an epoxy package with an outer shield. It consists of three pins and is about the size of a signal transistor. This inexpensive part can be purchased for about $2 on eBay to give your Raspberry Pi the ability to read many IR remote-control signals.
Figure 26-1 is a close-up photo of the VS1838B.
Figure 26-1. The VS1838B PIN photodiode
The datasheet provided for this part is mostly in Chinese. The most important parameter to decipher is ...