EL817(S1)(TU)

Overview

The EL817(S1)(TU) is a transistor output optocoupler manufactured by Everlight Electronics. It features a single channel with DC input and NPN phototransistor output. Key electrical parameters include an isolation voltage of 5000 Vrms, collector-emitter saturation voltage of 100 mV at 1 mA forward current and 20 mA collector current, and a maximum collector current of 50 mA. The device operates within a temperature range of -55°C to +110°C, has a typical rise/fall time of 18 µs, and a power dissipation of 200 mW.

Feature Summary

• Provides electrical isolation between input and output circuits via optical transmission
• Utilizes an NPN phototransistor for signal output switching
• Designed for surface-mount installation in compact PCB layouts

Applications

• Industrial control systems for signal isolation
• Power supply feedback loops
• Communication equipment interface protection

Procurement Notes

Verify the specific suffix designation (e.g., TU, G, F) against the manufacturer's datasheet to confirm package type and tape-and-reel specifications. Ensure the requested variant matches the required CTR binning and insulation class for the target application safety standards.

Selection Notes

Select this component when high isolation voltage is required for low-speed digital signal transmission. Consider the 18 µs switching speed limitations compared to faster logic outputs. Verify that the SOP-4 or DIP footprint aligns with the board design constraints and thermal management requirements.

Part Context

This part belongs to the EL817 family of optocouplers, widely used for general-purpose isolation. The S1 designation typically indicates a specific pin pitch or package variation within the surface-mount lineup. It serves as a standard replacement for legacy through-hole variants in modern automated assembly processes.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.