Optocoupler is an important component in electronics and here is EL817C that is a hugely popular optocoupler available in quartz components with such great price.

As like other optocouplers, it has an infrared emitting diode that optically controls a phototransistor. The forward voltage of the diode is typically 1.2V at 20mA of forward current. It is packaged in a 4-pin DIP Package.

Since it is the EL817C, it has the CTR value of 200-400 % at 5mA forward current with 5V of collector-emitter voltage. The phototransistor supports a maximum of 50mA collector current.

EL817C pinout:

Specification :

• Package/Case  : DIP-4
• Mounting Type  : TH
• CTR  : 200-400% at IF=5mA ,VCE=5V
• Rise Time: 18μs
• Fall Time  : 18μs
• Operating Temperature Range (°C)  : -55 to 110
• Dimensions in mm (LxWxH)  : (each) 6.50 x 4.58 x 4.50
• Maximum Collector Emitter Voltage  : 35 V
• Maximum Collector Current  : 50 mA
• Isolation Voltage  : 5000 Vrms
• Maximum Collector Emitter Saturation Voltage  :2 V
• Vf - Forward Voltage  :2 V
• Vr - Reverse Voltage  : 6 V
• Pd - Power Dissipation  : 200 mW
• Number of Channels  : 1 Channel

EL817C Applications:

1. SMPS
2. Isolated Data input
3. Measurements
4. Communication between two different voltage level circuits
5. Hazardous interfaces where manual interventions required
6. High power Relay driving

EL817C Dimension and footprint:

Example Projects on EL817C:

Relay Driver using 817

Additional Resources:

EL817C Datasheet

Package Contains

1x EL817C DIP Package