EL3H7(A)(TA)-G

Overview

The EL3H7(A)(TA)-G is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features an NPN phototransistor output with a collector-emitter voltage rating of 80 V and a maximum collector current of 50 mA. The device provides high isolation capability with an insulation voltage of 3750 Vrms. Key electrical parameters include a forward voltage of 1.2 V at a maximum forward current of 50 mA, and a power dissipation of 200 mW. The current transfer ratio ranges from 80% to 160%. The component operates within a temperature range of -55°C to +110°C and is housed in a surface-mount SSOP-4 package.

Feature Summary

• Provides galvanic isolation between input and output circuits using infrared LED and NPN phototransistor technology.
• Offers high dielectric strength with an insulation voltage rating of 3750 Vrms for safety-critical applications.
• Designed for surface-mount assembly in a compact four-pin SSOP package to facilitate automated PCB placement.

Applications

• Signal isolation in microcontroller-based control systems
• Interface circuits for solid-state relays
• Noise immunity enhancement in industrial communication lines

Procurement Notes

Verify the specific suffix (A) corresponds to the required Current Transfer Ratio bin, as variations exist within the EL3H7 series. Confirm that the SSOP-4 package dimensions match the target footprint. Ensure compliance with RoHS directives if required by the end product specifications. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a standard NPN phototransistor output is sufficient for digital switching applications. The 80 V collector-emitter voltage supports moderate load requirements. Consider the 80-160% CTR range for logic level compatibility. Evaluate thermal management needs given the 200 mW power dissipation limit in enclosed spaces.

Part Context

This part belongs to the EL3H7-G series of transistor output optocouplers from Everlight Electronics. The series offers various CTR bins denoted by suffixes such as A, B, C, and I. These devices are commonly used in general-purpose isolation tasks where cost-effectiveness and reliability are prioritized over high-speed performance characteristics found in faster optocoupler families.

Replacement Considerations

Direct substitutes may include other EL3H7 variants with different CTR bins (e.g., EL3H7(B)(TA)-G or EL3H7(C)(TA)-G) if the specific gain range differs. Verify pinout compatibility and package dimensions before substitution. Alternative brands offering similar 3750 Vrms isolation and SSOP-4 packaging should be evaluated for electrical parameter equivalence.