EL817(D)-G

Overview

The EL817(D)-G is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features an infrared emitting diode coupled to an NPN phototransistor within a 4-pin DIP package. The device provides electrical isolation with a rated insulation voltage of 5000 Vrms. Key electrical parameters include a maximum collector-emitter voltage of 35 V and a continuous collector current of 50 mA. The unit operates across a temperature range of -55°C to +110°C, ensuring reliability in industrial environments.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Integrates an infrared LED with an NPN phototransistor for signal transmission
• Designed for through-hole mounting in standard DIP-4 packages

Applications

• Industrial control systems requiring circuit isolation
• Signal switching in microprocessor interfaces
• Power supply feedback loops

Procurement Notes

Verify the specific suffix (D) against the manufacturer's datasheet to confirm pinout configuration and mechanical dimensions. Ensure compliance with RoHS directives if required by the target market. Cross-reference the part number with official Everlight documentation to validate availability and lead times before finalizing procurement plans.

Selection Notes

Select this component when a robust, general-purpose optoisolator is needed for low-speed digital signaling. The 5000 Vrms isolation rating supports safety standards for mains-connected equipment. Consider the 50 mA collector current limit when designing load circuits to ensure the phototransistor operates within its safe operating area during switching events.

Part Context

This component belongs to the EL817 series of transistor output optocouplers from Everlight. The series is widely recognized for its cost-effectiveness and reliability in basic isolation applications. The 'G' suffix typically indicates lead-free packaging compliant with environmental regulations, while the base model defines the internal semiconductor structure.

Replacement Considerations

Direct replacements may include other EL817 variants from Everlight or equivalent models from manufacturers such as Vishay or Sharp, provided they share the same 4-DIP footprint and electrical ratings. Verify that substitute parts meet the required isolation voltage and current transfer ratio specifications.