EL817(S)(C)(TU)

Overview

The EL817(S)(C)(TU) is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features an NPN phototransistor output and operates with DC input signals. The device provides high electrical isolation with a rated insulation voltage of 5000 Vrms. It is housed in a compact 4-SMD surface-mount package designed for automated assembly. Key electrical specifications include a maximum collector-emitter voltage of 35V, a continuous collector current of 50mA, and a maximum forward current of 60mA. The unit supports an operating temperature range from -55°C to +110°C.

Feature Summary

• Provides galvanic isolation between input and output circuits using infrared light transmission
• Features a compact small outline surface-mount package suitable for space-constrained designs
• Complies with RoHS standards and is lead-free
• Holds UL and VDE safety approvals for international regulatory compliance

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops for voltage regulation
• Communication equipment interface isolation

Procurement Notes

Verify the specific suffix configuration against the official datasheet to ensure compatibility with required safety certifications and packaging formats. Confirm availability status as distribution channels may report limited stock or end-of-life conditions for certain variants. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability before finalizing procurement orders.

Selection Notes

Select this component when a surface-mount solution is required for isolating low-voltage digital signals from higher voltage loads. Ensure the design accommodates the specified 5000 Vrms isolation rating for the target application environment. Verify that the NPN phototransistor output characteristics align with the downstream circuit requirements for current transfer ratio and saturation voltage levels.

Part Context

This component belongs to the EL817 series of optocouplers, which are widely used for general-purpose signal isolation. The SMD variant offers a smaller footprint compared to traditional DIP packages, facilitating denser PCB layouts. It serves as a direct replacement for through-hole versions in modern surface-mount manufacturing processes while maintaining equivalent electrical performance and isolation capabilities.

Replacement Considerations

Equivalent parts include the EL817S1(C)(TU)-F and EL817S1(C)(TU)-V. Verify pinout compatibility and package dimensions before substitution.