EL3H7(B)-VG

Overview

The EL3H7(B)-VG is a single-channel transistor output optocoupler manufactured by Everlight Electronics Co Ltd. It features an NPN phototransistor output with a maximum collector-emitter voltage of 80V and a continuous collector current of 50mA. The device provides high isolation capability with an insulation voltage of 3750Vrms. Key electrical parameters include a typical forward voltage of 1.2V, a maximum collector-emitter saturation voltage of 200mV, and a DC current transfer ratio ranging from 130% to 260% at a forward current of 5mA. The component operates within a temperature range of -55°C to +110°C and utilizes a 4-SSOP surface mount package.

Feature Summary

• Provides galvanic isolation between input and output circuits using an infrared LED and NPN phototransistor pair.
• Offers high dielectric strength with a rated insulation voltage of 3750Vrms for safety-critical applications.
• Features a compact 4-pin SSOP package designed for space-constrained surface mount assembly.
• Delivers fast switching performance with typical rise and fall times of 5µs and 3µs respectively.

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops for voltage regulation
• Microcontroller interface circuits for level shifting
• Solid-state relay driver circuits

Procurement Notes

Verify the specific CTR bin code corresponding to the suffix in the part number, as performance varies across the EL3H7 series. Confirm package compatibility with PCB footprints, noting potential distinctions between SOIC and SSOP variants. Ensure compliance with RoHS directives if required by the target market. Cross-reference manufacturer datasheets for exact thermal derating curves and recommended soldering profiles to prevent component damage during assembly.

Selection Notes

Select this component when high isolation voltage is required in a small form factor. Compare current transfer ratio specifications against circuit gain requirements to ensure adequate signal transmission. Evaluate operating temperature ranges to confirm suitability for the intended environmental conditions. Consider the switching speed limitations relative to the application's data rate needs. Verify that the output transistor's voltage and current ratings exceed the maximum load expectations.

Part Context

This device belongs to the EL3H7 series of ultra-small optocouplers from Everlight. The series includes various bins differentiated by current transfer ratio ranges and packaging options. These components are engineered for general-purpose isolation tasks where board space is limited. The family shares common pinout configurations but differs in electrical performance characteristics defined by their specific model suffixes.

Replacement Considerations

Equivalent parts include EL3H7(C)(TB)-VG and EL3H7(D)(TA)-VG. Substitutes must match the 4-SSOP package and 3750Vrms isolation rating. Verify that the replacement's current transfer ratio meets the original design's minimum gain requirements. Check for identical pin assignments to ensure direct footprint compatibility without circuit modification.

FAQ

What is the maximum collector-emitter voltage for the EL3H7(B)-VG?

The maximum collector-emitter voltage (Vceo) is 80V.

Does the EL3H7(B)-VG support surface mount technology?

Yes, it is available in a 4-SSOP surface mount package.

What is the typical current transfer ratio for this model?

The DC current transfer ratio typically ranges from 130% to 260% at a forward current of 5mA.