PD638B is an infrared photodiode produced by Everlight. This component is of the miniature SMD package type and is suitable for use in infrared technology applications such as remote control, barrier sensing, industrial automation, fire alarm, motion detection and general security systems. It has high sensitivity and fast response times, making it an ideal choice for these applications. It is made with a reverse breakdown voltage of 5V and a high forward current of 1mA. The PD638B also has excellent heat dissipation capabilities, making it reliable in many applications. Additionally, the PD638B has a high-power capability up to 5W and superb EMI immunity, making it an ideal choice for a variety of applications requiring high power or EMI immunity.