C30902E, C30902S, C30921E, C30921S
The C30902S and C30921S are selected C30902E and
C30921E photodiodes having extremely low noise and bulk
dark-current. They are intended for ultra-low light level
applications (optical power less than 1 pW) and can be used in
either their normal linear mode (V < V ) at gains up to 250
R
BR
or greater, or as photon counters in the "Geiger" mode (V
>
R
V
) where a single photoelectron may trigger an avalanche
BR
8
pulse of about 10 carriers. In this mode, no amplifiers are
necessary and single-photon detection probabilities of up to
approximately 50% are possible.
Photon-counting is also advantageous where gating and
coincidence techniques are employed for signal retrieval.
Figure 1. Typical Spectral Responsivity at 22°C
Optical Characteristics
C30902E, C30902S (Figure 13)
Photosensitive Surface:
Shape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Circular
2
Useful area . . . . . . . . . . . . . . . . . . . . . . . . . .0.2 mm
Useful diameter . . . . . . . . . . . . . . . . . . . . . . .0.5 mm
Field of View:
Approximate full angle for totally
illuminated photosensitive surface . . . . . . . . .100 deg
C30921E, C30921S (Figure 14)
Numerical Aperture of Light Pipe . . . . . . . . . . . . .0.55
Refractive Index (n) of Core . . . . . . . . . . . . . . . . .1.61
Lightpipe Core Diameter . . . . . . . . . . . . . . . . . . . .0.25 mm
Figure 2. Typical Quantum Efficiency vs. Wavelength
Maximum Ratings, Absolute-Maximum Values (All Types)
Reverse Current at 22°C:
Average value, continuous operation
Peak value
200 µA
1 mA
(for 1 second duration, non-repetitive)
Forward Current, I at 22°C:
F
Average value, continuous
operation
5 mA
Peak value (for 1 second
duration, non-repetitive)
Maximum Total Power Dissipation at 22°C
Ambient Temperature:
50 mA
60 mW
Storage, T
stg
-60 to +100°C
-40 to +70°C
200°C
Operating, T
A
Figure 3. Typical Noise Current vs. Gain
Soldering (for 5 seconds)
PERKINELMER [ PERKINELMER OPTOELECTRONICS ]
