EL3H7(B)-G

Overview

The EL3H7(B)-G is a single-channel transistor output optocoupler manufactured by Everlight Electronics Co Ltd. It features an infrared emitting diode optically coupled to an NPN phototransistor detector, encapsulated in a green compound within a 4-SSOP package. The device provides high isolation voltage of 3750 Vrms between input and output terminals. It operates within a temperature range of -55°C to +110°C. The current transfer ratio (CTR) typically ranges from 130% to 260% at an forward current of 5mA and collector-emitter voltage of 5V.

Feature Summary

• High isolation voltage capability for safe signal transmission between circuits of different potentials
• Compact surface-mount 4-SSOP packaging suitable for space-constrained designs
• Wide operating temperature range ensuring reliability in harsh environments
• Halogen-free construction compliant with environmental standards

Applications

• DC-DC converters
• Telecommunication equipment
• Signal transmission between circuits of different potentials and impedances

Procurement Notes

Verify the specific suffix designation against official Everlight documentation, as variations such as (TA), (TB), or (EB) may indicate differences in packaging type, reel specifications, or regional compliance certifications. Confirm availability status through authorized distributors, as supply constraints may affect immediate procurement. Ensure the selected variant matches the required mechanical footprint and thermal characteristics for the target application.

Selection Notes

Select this component when high isolation voltage and compact form factor are required for digital signal isolation. Consider the CTR range and switching speed characteristics relative to the driving circuit requirements. Verify that the 4-SSOP package dimensions align with the PCB layout constraints. Evaluate the operating temperature range to ensure suitability for the intended environmental conditions.

Part Context

The EL3H7-G series represents a family of transistor output optocouplers designed for general-purpose isolation applications. Variants within this series share core electrical characteristics but differ in packaging configurations and specific performance tolerances. The EL3H7(B)-G specifically denotes a standard configuration within this lineup, offering a balance of performance and cost-effectiveness for industrial and consumer electronics.

Replacement Considerations

Direct replacements include other variants within the EL3H7-G series, such as EL3H7(A)-G or EL3H7(C)-G, provided pin compatibility and electrical parameters match. Cross-brand alternatives require verification of isolation voltage, CTR, and package dimensions to ensure functional equivalence without redesigning the host circuit.