EL208

Overview

The EL208 is a transistor-output optocoupler manufactured by Everlight Electronics Co Ltd. It features a single channel with an NPN phototransistor output and includes a base terminal for enhanced performance control. The device provides a high isolation voltage of 3750 Vrms, ensuring safety in high-voltage applications. It is housed in an 8-SOP package, suitable for surface mount technology. Key electrical parameters include a collector-emitter voltage of 80V and a current transfer ratio ranging from 160% to 320% at a forward current of 10mA.

Feature Summary

• Integrates an NPN phototransistor with a dedicated base pin for improved switching speed and linearity.
• Provides robust electrical isolation rated at 3750 Vrms between input and output circuits.
• Designed for surface mount assembly using standard SOP-8 packaging.

Applications

• Industrial automation control systems
• Power supply feedback loops
• Signal isolation in microprocessor interfaces

Procurement Notes

Verify the specific suffix (e.g., TA, TB) against your bill of materials, as these denote tape-and-reel packaging variations rather than functional differences. Confirm RoHS compliance status and ensure the supplier provides official datasheets matching the exact part number to avoid counterfeit components. Check lead times for reel quantities if applicable.

Selection Notes

Select this component when high isolation voltage and fast response are required in a compact surface-mount form factor. The presence of a base terminal allows for external biasing to optimize turn-off time and linearity compared to baseless variants. Ensure the operating temperature range and current transfer ratio specifications meet the circuit design requirements.

Part Context

The EL208 belongs to Everlight's family of transistor-output optocouplers designed for general-purpose isolation. It shares similar structural characteristics with models like the EL211 and EL212 but is distinguished by its specific electrical ratings and package configuration. This series is widely used in applications requiring reliable signal transmission across isolated barriers.

Replacement Considerations

Direct substitutes may include other 8-SOP transistor optocouplers with comparable 3750 Vrms isolation and NPN outputs. Verify pinout compatibility and current transfer ratio ranges before substitution. Models such as the EL208-V or EL208(TB) represent variant packaging or compliance statuses of the same core device.