The BPW34 is a photodiode that can also function as a miniature solar cell. It is widely used in light measurement and solar energy applications due to its sensitivity to light and compact size. Below are the key features and details:

Features:

1. Material: Silicon.
2. Spectral Range: The BPW34 is sensitive to wavelengths between approximately 400 nm and 1100 nm, peaking in the near-infrared region around 950 nm.
3. Package Type: Miniature flat package with a transparent epoxy dome, designed to maximize light reception.
4. Active Area: The photodiode has an active area of approximately 7.5 mm².
5. Efficiency: It is highly efficient in converting light into electrical energy, though it is optimized for photodetection rather than power generation.
6. Applications:
   • Ambient light sensing.
   • IR remote control systems.
   • Optical communication.
   • DIY solar energy projects.

Electrical Characteristics:

• Open-Circuit Voltage: Can generate small voltages (in millivolts) when exposed to light.
• Short-Circuit Current: Proportional to the light intensity; typically a few microamps to milliamps depending on the intensity.
• Reverse Voltage (as photodiode): Up to 32 V.
• Dark Current: Very low, which makes it suitable for low-light applications.

Using BPW34 as a Solar Cell:

While it is primarily a photodiode, the BPW34 can be used as a miniature solar cell to power small circuits or sensors. However, due to its small active area, the energy output is minimal and suited only for ultra-low power applications.