Light-Dependent Photoresistors for
Sensor Applications
Preview
The cadmium sulde (CdS) or light dependent resistor (LDR) whose resistance is inversly dependent
on the amount of light falling on it, is known by many names including the photo resistor, photoresistor,
photoconductor, photoconductive cell, or simply the photocell.
A typical structure for a photoresistor uses an active semiconductor layer that is deposited on an insulating
substrate. The semiconductor is normally lightly doped to enable it to have the required level of conductivity.
Contacts are then placed either side of the exposed area.
The photo-resistor, CdS, or LDR nds many uses as a low cost photo sensitive element and was used for many
years in photographic light meters as well as in other applications such as smoke, ame and burglar detectors,
card readers and lighting controls for street lamps.
Providing design engineers with an economical CdS or LDR with high quality performance, Token Electronics
now offers commercial grade PGM photoresistor. Designated the PGM Series, the photoresistors are available in
5mm, 12mm and 20mm sizes, the conformally epoxy or hermetical package offer high quality performance for
applications that require quick response and good characteristic of spectrum.
Token has been designing and manufacturing high performance light dependent resistors for decades. Our
product offerings are extensive and our experience with custom photoresistor is equally extensive. Contact us
with your specic needs.
Features
- Quick Response
- Reliable Performance
- Epoxy or hermetical package
- Good Characteristic of Spectrum
Applications
- Photoswitch
- Photoelectric Control
- Auto Flash for Camera
- Electronic Toys, Industrial Control
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Terminology
PGM CDS Photoresistors
● Light Resistance :
Measured at 10 lux with standard light A
(2854K-color temperature) and 2hr.
preillumination at 400-600 lux prior testing.
● Dark Resistance :
Measured at 10th seconds after closing 10 lux.
● Gamma characteristic :
Under 10 lux and 100 lux and given by γ = log(R10/R100) / log(100/10) = log(R10/R100)
R10, R100: resistance at 10 lux and 100 lux.
The tolerance of γ is ±0.1.
● Pmax :
100
Max. power dissipation at ambient
temperature of 25°C.At higher ambient
temperature,the maximum power permissible
may be lowered.
Sensitive surface
Ceramic substrate
Resin Encapsulation
Lead wires
80
60
40
Electrodes
Conducting resin
CdS
CdSe
Cd(S.Se)
● Vmax :
Max. voltage in darkness that may be
applied to the device continuously.
20
Relative sensitivity(%)
0
400 500 600 700 800 900 1000
Wavelength(nm)
● Spectral peak :
Spectral sensitivity of photoresistors depends on the wavelength of light they are exposed to and
in accordance with gure ‘Spectral Response’.
The tolerance of spectral peak is ±50nm.
02 of 03
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Physical and Environmental Characteristics
ITEMCONDITIONSPERFORMANCE
Solderability
Temperature Changing
Constant humidity
and heat
Constant load Temperature
Wire Terminals Strength
Vibration
Put the terminals into welding tank at temp. 230±5°C for 2±0.5s
(terminal roots are 5mm away from the tin surface).
Change of temperature in accordance with: TA: -40°C
TB: +60°C Number of cycles: 5 Exposure duration: 30min
1. Put the device in test box at Temperature: 60±5°
CHumidity: 90-95% Illumination: 0lux Duration: 100h
2. Take the device and measure after24h at normal
temperature and humidity.
At 25±5°C
Illumination: 150lux at rated power
Duration: 600h
Bend the wire terminal at its root to 90 degree,and then bend it to
a opposite direction.
Frequency: 50Hz
Swing: 1.5mm with
Directions: parallel to ceramic substrate normal to ceramic substrate. Duration:2h
PGM5 CDS Photoresistors
wetting>95%
Drift of R10 = ± 20%
No visible damage
Drift of R10= ± 30%
No visible damage
No visible damage
No visible damage
No visible dam
How to Order
Part Number
Package
pPGM5516
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TOKEN
Congurations & Dimensions
PGM5 CDS Photoresistors
PGM5**** series
Epoxy resin package
PGM55**-MP series
Hermetical package
Note: All dimensions are in mm and NTS.
Ø5.1±0.2
Ø 6.5
Ø5.5
4 max
4.3±0.2
Ø0.5
32±2
2.4Max
34±2
3.4
3.4
Ø 0.5
02 of 03
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Electronics Characteristics
PGM5 CDS Photoresistors
Model
PGM550610090-30 ~ +705402 ~ 60.150.63040
PGM551610090-30 ~ +705405 ~ 100.20.63040
PGM5526150100-30 ~ +705408 ~ 201.00.62030
PGM5537150100-30 ~ +7054016 ~ 502.00.72030
PGM5539150100-30 ~ +7054030 ~ 905.00.82030
PGM5549150100-30 ~ +7054045 ~ 14010.00.82030
PGM5616D150100-30 ~ +705605 ~ 101.00.62030
PGM5626D150100-30 ~ +705608 ~ 202.00.62030
PGM5637D150100-30 ~ +7056016 ~ 505.00.72030
PGM5639D150100-30 ~ +7056030 ~ 9010.00.82030
PGM5649D150100-30 ~ +7056050 ~ 16020.00.82030
PGM5659D150100-30 ~ +70560150 ~ 30020.00.82030
Vmax
(VDC)
Pmax
(mW)
Ambient
Temp
(°C)
Spectral
Peak
(nm)
Photo
Resistance
(10Lx) (KΩ)
Dark
Resistance
(MΩ)min
γ
min
ResponseTime
(ms)
RiseDecay
Electronics Characteristics
Response Time
γ
RiseDecay
(ms)
Model
Vmax
(VDC)
Pmax
(mW)
Ambient
Temp
(°C)
Spectral
Peak
(nm)
Photo
Resistance
(10Lx) (KΩ)
Dark
Resistance
(MΩ)min
min
PGM5506-MP10090-30 ~ +705402 ~ 60.150.63040
PGM5516-MP10090-30 ~ +705405 ~ 100.20.63040
PGM5526-MP150100-30 ~ +705408 ~ 201.00.62030
PGM5537-MP150100-30 ~ +7054016 ~ 502.00.72030
PGM5539-MP150100-30 ~ +7054030 ~ 905.00.82030
PGM5549-MP150100-30 ~ +7054045 ~ 14010.00.82030
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Page 6
Version 2010
TOKEN
Congurations & Dimensions
PGM12** series
Epoxy resin package
PGM12 CDS Photoresistors
Ø12Max
2.4MAX
Ø0.5
10.8Max
9
32typ.
Ø 0.5
34±2.0
PGM12**-MP series
Hermetical package
Note: All dimensions are in mm and NTS.
Ø 13.8
5.5 Max
Ø 12.6
Ø 10
9
(PGM12**) Electronics Characteristics
Response Time
γ
(ms)
RiseDecay
Model
Vmax
(VDC)
Pmax
(mW)
Ambient
Temp
(°C)
Spectral
Peak
(nm)
Photo
Resistance
(10Lx) (KΩ)
Dark
Resistance
(MΩ)min
min
PGM1200250250-30 ~ +705602~51.00.63040
PGM1201250250-30 ~ +705604~102.00.73030
PGM1202250250-30 ~ +705608~205.00.73030
PGM1203250250-30 ~ +7056018~50100.83030
PGM1204250250-30 ~ +7056045~150200.83030
PGM1205250250-30 ~ +70560140~300200.83030
PGM1200-MP250250-30 ~ +705602~51.00.63040
PGM1201-MP250250-30 ~ +705604~102.00.73030
PGM1202-MP250250-30 ~ +705608~205.00.73030
PGM1203-MP250250-30 ~ +7056018~50100.83030
PGM1204-MP250250-30 ~ +7056045~150200.83030
PGM1205-MP250250-30 ~ +70560140~300200.83030
02 of 03
(PGM12**-MP) Electronics Characteristics
Ambient
Temp
(°C)
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Model
Vmax
(VDC)
Pmax
(mW)
Spectral
Peak
(nm)
Photo
Resistance
(10Lx) (KΩ)
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Dark
Resistance
(MΩ)min
γ
min
Response Time
(ms)
RiseDecay
Page 7
Version 2010
TOKEN
Electronics Characteristics
PGM20** series
Epoxy resin package
PGM20 CDS Photoresistors
Ø20.5MAX
2.5MAX
2-Ø1
15.5±0.5
Plastic Case
Ø 22
PGM20**-MP series
Hermetical package
Note: All dimensions are in mm and NTS.
Epoxy Resin
2-Ø1
15.5±0.5
(PGM20**) Electronics Characteristics
ResponseTime
(ms)
RiseDecay
Model
Vmax
(VDC)
Pmax
(mW)
Ambient
Temp (°C)
Spectral
Peak
(nm)
Photo
Resistance
(10Lx) (KΩ)
Dark
Resistance
(MΩ)min
γ
min
PGM2000500500-30 ~ +705602~51.00.63040
PGM2001500500-30 ~ +705604~102.00.73030
PGM2002500500-30 ~ +705608~205.00.73030
PGM2003500500-30 ~ +7056018~50100.83030
PGM2004500500-30 ~ +7056045~150200.83030
PGM2005500500-30 ~ +70560140~300200.83030
30±2
5
26 Ref.
(PGM20**-PP) Electronics Characteristics
Model
PGM2000-PP500500-30 ~ +705602~51.00.63040
PGM2001-PP500500-30 ~ +705604~102.00.73030
PGM2002-PP500500-30 ~ +705608~205.00.73030
PGM2003-PP500500-30 ~ +7056018~50100.83030
PGM2004-PP500500-30 ~ +7056045~150200.83030
PGM2005-PP500500-30 ~ +70560140~300200.83030
Vmax
(VDC)
Pmax
(mW)
Ambient
Temp (°C)
Spectral
Peak (nm)
Photo
Resistance
(10Lx) (KΩ)
Dark
Resistance
(MΩ)min
γ
min
Response Time
(ms)
RiseDecay
Back to 1st Page - CdS Photo Resistors (PGM)
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