EL817(A)-G

Overview

The EL817(A)-G is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features an infrared emitting diode optically coupled to an NPN phototransistor detector, encapsulated in a green compound within a 4-pin DIP package (0.300 inch / 7.62mm spacing). The device provides high isolation voltage of 5000 Vrms between input and output. Key electrical parameters include a minimum current transfer ratio (CTR) of 50% at IF=5mA and VCE=5V, a maximum collector-emitter breakdown voltage of 35V, and a maximum forward current of 50mA. It operates within a temperature range of -55°C to +110°C.

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, SEMKO, NEMKO, DEMKO, FIMKO, CSA, and BSI approvals

Applications

• Signal isolation in industrial control systems
• Switching power supply feedback loops
• Microcontroller input/output isolation

Procurement Notes

Verify the specific suffix 'A' indicates the CTR binning category (typically 50%-600%) as defined in the official datasheet. Confirm the '-G' suffix denotes lead-free composition and RoHS compliance. Ensure the package type matches the required DIP-4 footprint with 7.62mm pin spacing. Cross-reference the manufacturer's latest documentation for any changes in approval status or material declarations.

Selection Notes

Select this component when a standard NPN phototransistor output is required for galvanic isolation. The EL817(A)-G offers a balance of performance and cost-effectiveness for general-purpose applications. Consider the CTR range requirements of the target circuit; the 'A' grade typically covers a wide transmission ratio range. Verify that the 35V collector-emitter voltage rating meets the load requirements.

Part Context

The EL817 series is a widely used family of photocouplers from Everlight. The base model consists of an IR LED and a phototransistor. Variants like the EL817(A)-G specify the CTR binning ('A') and environmental compliance ('-G'). This series is distinct from other Everlight optocouplers such as the EL814 or EL816, which may have different output types or channel counts.

Replacement Considerations

Direct replacements must match the 4-DIP package, 5000Vrms isolation, and NPN phototransistor output. Check if competitor parts offer compatible CTR ranges for the 'A' bin. Ensure substitute components maintain the same thermal and electrical ratings for safe integration.