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Optocouplers (Photocell (CdS) Output)
The CdS photocell output optocouplers optically couple an LED to a CdS Light Dependent Resistor (LDR). The LDR resistance increases when the LED current is OFF and decreases when LED current is ON. The device showcases a large dynamic range with a response time that efficiently mimics the human eye's sensitivity to light changes. Engineered with High, Medium, and Low dark resistances, the optocouplers are available with diverse resistance values to suit various applications. The photocells are encased in an opticallyisolated structures.
Type No.: NSL-37V51
*30Ω ON-Resistance Photocell (CdS) Output Optocoupler
■Typical Applications:
● Industrial
■Features
● Compact Moisture Resistant Package
● Low LED Current
●Passive Resistance Output
■Absolute Maximum Rating:
| Symbol | Parameter | Min | Max | Unit |
| VR | DC Voltage Applied | / | 2500 | V |
| To | Operating and storage temperature | -30 | +70 | ℃ |
| Ts | Soldering Temperature* | / | 260 | ℃ |
*0.118 inch from base for 3seconds with heat sink
■Typical Electro-optical characteristics rating (Ta=25 ℃ unless otherwise noted)
| Symbol | Characteristics | Text Conditions | Min | Typ | Max | Units |
| LED | ||||||
| If | Forward Current | - | / | / | 40 | mA |
| VF | Forward Voltage | If=20mA | / | / | 2.5 | V |
| IR | Reverse Voltage | - | / | / | 3 | V |
| Photoconductive Cell | ||||||
| VMAX | Max. Cell Voltage | peak AC or Dc | / | / | 100 | V |
| PD | Power Dissipation *1 | - | / | / | 175 | mW |
| COUPLED | ||||||
| Ron | On Resistance | If=1.0mA | / | 30 | / | KΩ |
| Ron | If=10mA | / | 5 | / | KΩ | |
| Ron | If=40mA | / | 1.5 | / | KΩ | |
| Roff | Off Resistance | 10sec after If=0mA | 10 | / | / | MΩ |
| TR | Rise Time *2 | Time for the dark to light change in conductance to reach 63% of its final value | / | 2.5 | / | msec |
| TD | Decay Time | Time to reach 100KΩ after removal of If=40mA | / | / | 35 | msec |
*1Derate linearly to 0 at 75° C
*2The Rise Time, TR, is the time required for the dark to light change in conductance to reach 63% of its final value.
■Typical Mechanical Specifications
Units are in [mm] The product has tolerances.
■General Care and Handling Instructions
Handling and Storage
• Handle Optocouplers and LEDs gently to prevent damage.
• Avoid exposing the devices to temperatures exceeding the storage temperature rating of the device.
• Maintain a non-condensing environment for optimum performance and lifetime.
Cleaning
• For plastic molded devices, cleaning with a 50/50 mixture of Methanol and isopropyl alcohol is recommended. Cleaning in an ultrasonic bath is generally not recommended.
Special Considerations
• Avoid exposing plastic molded devices or epoxy glob topdevices to harsh chemicals like THINNERS, ACETONE, andTRICHLOROETHYLENE.
■Legal Disclaimer
Information in this data sheet is believed to be correct and reliable. However, no responsibility is assumed for possible inaccuracies or omission. Specifications are subject to change without notice.
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