Description
BPW21R is a planar Silicon PN photodiode in a hermetically sealed short TO–5 case, especially designed for high precision linear applications.
Due to its extremely high dark resistance, the short circuit photocurrent is linear over seven decades of illumination level.
On the other hand, there is a strictly logarithmic correlation between open circuit voltage and illumination over the same range.
The device is equipped with a flat glass window with built in color correction filter, giving an approximation to the spectral response of the human eye.

FEATUREs
• Hermetically sealed TO–5 case
• Flat glass window with built–in color correction filter for visible radiation
• Cathode connected to case
• Wide viewing angle ϕ = ± 50

• Large radiant sensitive area (A=7.5 mm2)
• Suitable for visible radiation
• High sensitivity
• Low dark current
• High shunt resistance
• Excellent linearity
• For photodiode and photovoltaic cell operation

APPLICATIONs
    Sensor in exposure and color measuring purposes