EL817(S)(D)(TB)

Overview

The EL817(S)(D)(TB) is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It integrates an infrared emitting diode with an NPN phototransistor detector, providing electrical isolation between input and output circuits. The device features a maximum insulation voltage of 5000 Vrms and operates within a temperature range of -55°C to +110°C. Key electrical parameters include a collector-emitter breakdown voltage of 35V, a maximum forward current of 50mA, and a typical dark current of 100nA. The unit is supplied in a surface-mount 4-SMD package.

Feature Summary

• High isolation voltage capability between input and output channels
• Compact surface-mount package design for automated assembly
• RoHS compliant construction without lead content

Applications

• Signal isolation in industrial control systems
• Feedback loops in switching power supplies
• Communication interface isolation

Procurement Notes

Verify the specific suffix configuration against the manufacturer datasheet to ensure correct package type and tape-and-reel specifications. Confirm RoHS compliance status and required safety certifications such as UL or VDE recognition before finalizing procurement orders.

Selection Notes

Select this component when surface-mount technology is required for high-voltage isolation applications. Ensure the operating temperature range meets system requirements and that the CTR specifications align with the driving circuit design constraints.

Part Context

This part belongs to the EL817 series of photocouplers produced by Everlight Electronics. The series includes various DIP and SMD variants designed for general-purpose signal isolation. The EL817 family is widely recognized for its reliability in consumer electronics and industrial equipment.

Replacement Considerations

Equivalent parts from other manufacturers may be considered if they match the 4-pin SMD footprint, 5000Vrms isolation rating, and NPN phototransistor output characteristics.