EL817(A)-F

Overview

The EL817(A)-F is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features a DIP-4 package with standard lead spacing and RoHS compliance. Key electrical parameters include a minimum current transfer ratio of 50% at an input forward current of 5mA and collector-emitter voltage of 5V. The device supports a maximum isolation voltage of 5000 Vrms between input and output circuits. It operates within a temperature range of -55°C to +110°C, with a maximum collector-emitter breakdown voltage of 35V and a peak forward current rating of 60mA.

Feature Summary

• High isolation voltage capability between input and output circuits
• Compact dual-in-line package design for through-hole mounting
• Compliant with international safety standards including UL, VDE, and SEMKO approvals

Applications

• General-purpose signal isolation in industrial control systems
• Input/output interface devices for microcontroller circuits
• Switching power supply feedback loops

Procurement Notes

Verify the specific suffix 'A' corresponds to the required Current Transfer Ratio (CTR) bin, as EL817 variants differ significantly in gain specifications. Confirm that the '-F' designation aligns with the intended packaging format, typically indicating tube packing for standard DIP-4 components. Ensure the procurement source provides official datasheets confirming UL and VDE recognition numbers, as these certifications are critical for end-product safety compliance. Cross-reference the manufacturer part number against distributor listings to avoid confusion with similar models like EL817(C) or EL817M.

Selection Notes

Select this component when a standard CTR range starting at 50% is sufficient for the application logic levels. The EL817(A)-F is suitable for general digital isolation where high-speed performance is not the primary constraint. Consider alternative suffixes if higher isolation voltage ratings or surface-mount packages are required. Verify that the 35V collector-emitter voltage meets the load requirements of the receiving circuit. Ensure the operating temperature range covers the environmental conditions of the final assembly.

Part Context

The EL817 series is a widely recognized family of phototransistor optocouplers used for electrical isolation. The EL817(A)-F specifically denotes the A-bin variant, which offers a lower minimum current transfer ratio compared to other bins like C or H. This model is part of Everlight's standard DIP-4 lineup, designed for cost-effective isolation solutions in consumer and industrial electronics. The series maintains compatibility with legacy designs while offering modern RoHS-compliant manufacturing processes.

Replacement Considerations

Direct substitutes may include other EL817 variants from Everlight or equivalent parts from manufacturers such as Vishay or Sharp, provided the CTR bin matches the design requirements. Ensure replacement parts maintain the same DIP-4 footprint and pinout configuration. Verify that any substitute component holds the necessary safety certifications (UL, VDE) if used in regulated applications.