V I S I B L E D E T E C T O R
CdS photoconductive cell
Resin coating type (7R,10R type)
Standard type designed to withstand high voltage and high power
CdS photoconductive cells utilize photoconductive effects in semiconductors that decrease their resistance when illuminated by light. These
sensors are non-polar resistive elements with spectral response characteristics close to the human eye (luminous efficiency), thus making their
operating circuits simple and small.
Features
Applications
Small size, thin substrate
Low price
Auto dimmer for digital display, CRT and room illumination
Automatic light on/off sensor
Suitable for high voltage and high power application
Sensor for electronic toy and teaching aid material
ꢀ Absolute maximum ratings / Characteristics (Typ. Ta=25 °C, unless otherwise noted)
Absolute maximum ratings
Characteristics *1
Resistance *2
5
Peak
sensitivity
wavelength
λp
Response time 10 lx
*
Power Ambient
Supply
4
*
100
γ 10
Dimensional
outline
dissipation temperature
voltage
Rise time Fall time
tf
0 lx *3
Type No.
10 lx, 2856 K
P
Ta
tr
Min.
(kΩ)
Max.
(kΩ)
Min.
(MΩ)
(Vdc)
(mW)
(°C)
(nm)
(ms)
(ms)
100 to 10 lx
7R type
P380-7R
P722-7R
P1195
200
100
200
100
200
50
-30 to +50
-30 to +60
-30 to +70
620
560
550
560
550
4.4
2.5
50
13
7.5
150
14
20
0.5
20
0.85
0.70
0.90
0.70
0.90
35
50
40
50
30
20
40
10
40
10
150
100
150
100
ꢀ
ꢀ
P1202-12
P1202-16
10R type
P722-10R
P1096-06
3.5
23
0.5
20
-30 to +60
67
200
100
300
100
560
550
12
36
0.70
0.75
-30 to +60
0.5
50
40
2.8
8.4
*1: All characteristics are measured after exposure to light (100 to 500 lx) for one to two hours.
*2: The light source is a standard tungsten lamp operated at a color temperature of 2856 K.
*3: Measured 10 seconds after removal of light of 10 lx.
*4: Typical gamma characteristics (within ±0.10 variations) between 100 lx to 10 lx
log (R100) - log (R10
)
γ 100
=
10
log (E100) - log (E10
)
E100, E10: illuminance 100 lx, 10 lx
R100, R10: resistance at 100 lx and 10 lx respectively
*5: The rise time is the time required for the sensor resistance to reach 63 % of the saturated conductance level (resistance w hen
fully illuminated). The fall time is the time required for the sensor resistance to decay from the saturated conductance level to
37 %.