EL3H4-G

Overview

The EL3H4-G is a single-channel phototransistor output optocoupler manufactured by Everlight Electronics. It provides electrical isolation with a rated insulation voltage of 3750 Vrms. The device accepts both AC and DC input signals via an internal infrared LED, which has a typical forward voltage of 1.2V. The output stage utilizes an NPN phototransistor capable of handling a maximum collector-emitter voltage of 80V. Typical switching characteristics include a rise time of 6µs and a fall time of 8µs. The component operates within a temperature range of -55°C to 100°C and is available in a 4-SSOP surface-mount package.

Feature Summary

• Supports AC and DC input signal transmission for versatile circuit integration
• Provides high-voltage electrical isolation between input and output circuits
• Features a compact surface-mount design suitable for automated assembly

Applications

• Signal isolation in microcontroller interfacing circuits
• Switching applications requiring galvanic isolation
• General-purpose digital signal transmission across isolated boundaries

Procurement Notes

Verify the specific suffix designation against the manufacturer's current documentation, as variations such as (TA), (EA), or (EB) may exist. Confirm that the requested variant matches the required packaging type, whether reel, cut tape, or tube. Ensure compliance with RoHS directives if applicable to the project requirements. Cross-reference the datasheet revision date to confirm the accuracy of electrical parameters before finalizing procurement specifications.

Selection Notes

Select this component when a single-channel transistor output is required for isolating low-power control signals. The AC/DC input capability allows flexibility in driving the internal LED without complex conditioning. Consider the 80V output voltage rating and switching speeds when designing for higher frequency applications. Verify that the 4-SSOP package dimensions fit the available PCB footprint constraints.

Part Context

This part belongs to the EL3H4 series of optocouplers from Everlight Electronics. The series typically includes variants with different suffixes indicating specific packaging or environmental qualifications. These devices are standard components used for basic signal isolation tasks in industrial and consumer electronics where cost-effective galvanic separation is necessary.

Replacement Considerations

Check for direct substitutes within the same family, such as EL3H4(EB)-G or EL3H4(TA)-G, ensuring pinout compatibility. Verify that alternative components match the 3750 Vrms isolation rating and 80V output voltage limit. Confirm that the replacement supports the same AC/DC input requirements and fits the 4-SSOP package form factor.