CDS Photoresistors (PGM)

Light-Dependent Photoresistors for Sensor Applications.

The cadmium sulfide (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 finds 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, flame and burglar detectors, card readers and lighting controls for street lamps.

Providing design engineers with an economical CdS or LDR with high quality performance, Direct 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.

Direct 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 specific needs.

Download complete specification - Cds Photoresistors.

Features :
  1. Quick Response
  2. Reliable Performance
  3. Epoxy or hermetical package
  4. Good Characteristic of Spectrum
Applications :
  1. Photoswitch
  2. Photoelectric Control
  3. Auto Flash for Camera
  4. Electronic Toys, Industrial Control
20mm CDS Photo Resistors (PGM) Configurations & Dimensions
Epoxy resin package
20mm CDS Photo Resistors Appearance PGM20** series
Epoxy resin package
20mm CdS PGM20** series Dimensions (Unit: mm)
Hermetical package
20mm CDS Photo Resistors Appearance PGM20**-PP series
Hermetical package
20mm CdS PGM20**-PP series Dimensions (Unit: mm)
Note : All dimensions are in mm and NTS.
CdS - (PGM20**) Electronics Characteristics
Model Vmax (VDC) Pmax (mW) Ambient
Temp
(°C)
Spectral Peak (nm) Photo
Resistance
(10Lx) (KΩ)
Dark Resistance (MΩ)min γ
min
Response Time
(ms)
Rise Decay
PGM2000 500 500 -30 ~ +70 560 2~5 1.0 0.6 30 40
PGM2001 500 500 -30 ~ +70 560 4~10 2.0 0.7 30 30
PGM2002 500 500 -30 ~ +70 560 8~20 5.0 0.7 30 30
PGM2003 500 500 -30 ~ +70 560 18~50 10 0.8 30 30
PGM2004 500 500 -30 ~ +70 560 45~150 20 0.8 30 30
PGM2005 500 500 -30 ~ +70 560 140~300 20 0.8 30 30
CdS - (PGM20**-PP) Electronics Characteristics
Model Vmax (VDC) Pmax (mW) Ambient
Temp
(°C)
Spectral Peak (nm) Photo
Resistance
(10Lx) (KΩ)
Dark Resistance (MΩ)min γ
min
Response Time
(ms)
Rise Decay
PGM2000-PP 500 500 -30 ~ +70 560 2~5 1.0 0.6 30 40
PGM2001-PP 500 500 -30 ~ +70 560 4~10 2.0 0.7 30 30
PGM2002-PP 500 500 -30 ~ +70 560 8~20 5.0 0.7 30 30
PGM2003-PP 500 500 -30 ~ +70 560 18~50 10 0.8 30 30
PGM2004-PP 500 500 -30 ~ +70 560 45~150 20 0.8 30 30
PGM2005-PP 500 500 -30 ~ +70 560 140~300 20 0.8 30 30