EL852

Overview

The EL852 is a transistor output optocoupler featuring a high-voltage photodarlington configuration. It provides electrical isolation between input and output circuits with a maximum insulation voltage of 5000 V rms. The device operates within a temperature range of -55 °C to +110 °C. Key electrical parameters include a minimum current transfer ratio of 50% at an input forward current of 5 mA and collector-emitter voltage of 5 V. The maximum collector-emitter breakdown voltage is specified at 35 V, with a maximum dark power of 100 nA.

Feature Summary

• High isolation voltage capability between input and output terminals
• Photodarlington structure for enhanced sensitivity
• Compact dual-in-line package design

Applications

• Switching power supplies
• Microprocessor system isolation
• Signal isolation in industrial control systems

Procurement Notes

Verify the specific suffix codes (such as M, S, or TA) against the manufacturer's datasheet to confirm lead spacing, mounting type, or packaging format. Ensure compliance requirements match project specifications, noting UL and VDE approvals are standard for this series. Confirm the exact part number variant before ordering to avoid mismatches in physical dimensions or reel specifications.

Selection Notes

Select the EL852 when high voltage isolation and darlington gain are required. Consider alternative models like the EL817 if lower isolation voltage or different CTR characteristics are acceptable. Evaluate thermal management needs given the operating temperature limits. Verify that the 35 V collector-emitter breakdown voltage meets the load requirements of the target circuit application.

Part Context

The EL852 belongs to Everlight's family of transistor output optocouplers. This series includes variants such as the EL817, which offers similar functionality but with different isolation and performance characteristics. The EL852 specifically utilizes a photodarlington output stage to achieve higher current transfer ratios compared to standard transistor outputs, making it suitable for applications requiring greater signal amplification.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.