EL817S1(A)(TU)-F

Overview

The EL817S1(A)(TU)-F is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features an infrared emitting diode input and an NPN phototransistor output housed in a surface-mount SOP-4 package with a 2.54mm lead pitch. Key electrical specifications include a collector-emitter voltage of 35V, a forward current of 60mA, and a collector current of 50mA. The device provides a high isolation voltage of 5000Vrms between input and output circuits. Typical performance metrics include a forward voltage of 1.2V, a reverse voltage of 6V, and a collector-emitter saturation voltage of 100mV at specified test conditions. The component supports a maximum power dissipation of 200mW and operates within a temperature range of -55°C to +110°C.

Feature Summary

• Provides galvanic isolation via optical coupling between input and output circuits
• Utilizes a compact surface-mount SOP-4 package for automated PCB assembly
• Ensures signal integrity through stable current transfer ratio characteristics
• Offers high dielectric strength to protect low-voltage control systems from high-voltage interference

Applications

• Industrial automation control systems requiring signal isolation
• Power supply feedback loops in switching regulators
• Communication equipment interface isolation

Procurement Notes

Verify the specific CTR binning code corresponding to the suffix 'A' against the manufacturer's datasheet, as this determines the minimum current transfer ratio. Confirm that the SOP-4 footprint matches the design requirements. Ensure compliance with RoHS directives if required by the target market. Cross-reference the tape and reel specifications for proper handling during surface mount placement.

Selection Notes

Select this component when a standard NPN phototransistor output is required for digital or analog signal isolation. The SOP-4 form factor is suitable for space-constrained designs. Consider the 5000Vrms isolation rating for applications involving significant potential differences between ground references. Evaluate the thermal management capabilities given the 200mW power dissipation limit in enclosed environments.

Part Context

This part belongs to the EL817 series of photocouplers, which are widely used for general-purpose isolation. The S1 designation indicates a surface-mount variant with specific lead bending for PCB mounting. The TU suffix typically denotes tape and reel packaging for high-volume manufacturing. This series is recognized by major safety agencies including UL, VDE, and CSA for use in end-product certifications.

Replacement Considerations

Compatible substitutes include other SOP-4 transistor output optocouplers with matching pinouts and similar electrical ratings. Verify that alternative parts meet the same isolation voltage and CTR specifications. Ensure the replacement component is available in tape and reel packaging if automated assembly is utilized.