PR5021 datasheet(4/8 Pages) PREMA

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Photodiode PR5020/21

Electrical and optical Characteristics

SENSITIVITY AFFECTED BY REVERSE VOLTAGE

The spectral sensitivity increases by a few per-

cent when reverse voltages are applied to the

photodiodes.

The diagram shows the relative deviation of the

photocurrent to the zero-bias value. The devi-

ation changes insignificantly when illumination

is changed. Neither the size nor the position of

the photodiodes affect the deviation signific-

antly.

Please notice that the relative deviation in-

creases if the adjacent photodiode is not

biased. In that case also the size of the photodi-

ode and the illumination affect the difference in

photocurrent measured with increased reverse

voltage.

CAPACITANCE

The diagram illustrates the dependency of the

capacitances on the applied reverse voltage of

the PR5020 (orange) and the PR5021 (blue).

Both types have two identical photodiodes C1

and C3 (dashed lines) and a single photodiode

C2 located in the center of the dies (solid lines).

The capacitances of the photodiodes are pro-

portional to their area and decrease with re-

verse voltage due to the reduction of the space-

charge region.

Taking the area of each photodiode into ac-

count leads to a capacitance density of about

157 pF/mm2 at zero reverse voltage. The de-

crease of the capacitance with increasing re-

verse voltage is identical for all photodiodes

and shown in the inset.

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