EL3H7(B)(TA)-VG

Overview

The EL3H7(B)(TA)-VG is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features an NPN phototransistor output with a maximum collector current of 50 mA and a collector-emitter voltage rating of 80 V. The device provides high isolation capability with an insulation voltage of 3750 Vrms. Key electrical parameters include a typical forward voltage of 1.2 V at a maximum DC forward current of 50 mA, and a maximum collector-emitter saturation voltage of 200 mV. The Current Transfer Ratio (CTR) ranges from 130% to 260% when tested at 5 mA input current. The component operates within a temperature range of -55°C to +110°C and is housed in a compact 4-SSOP 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 3750 Vrms for safety-critical applications.
• Designed for surface-mount assembly in a small form factor 4-SSOP package to save board space.
• Capable of operating reliably across a wide industrial temperature range from -55°C to +110°C.

Applications

• Signal isolation in microprocessor-based control systems
• Switching power supply feedback loops
• Solid-state relay driver circuits
• Industrial communication interface isolation

Procurement Notes

Verify the specific CTR binning designation indicated by the suffix (B) against design requirements, as performance varies within the 130-260% range. Confirm that the 4-SSOP package dimensions match the PCB footprint exactly. Ensure compliance with RoHS3 directives if required by the target market regulations. Check for any specific handling precautions related to moisture sensitivity level 1 during storage and reflow soldering processes.

Selection Notes

Select this component when a compact, high-isolation optocoupler is needed for digital signal transmission. The NPN phototransistor output is suitable for standard logic interfacing. Consider the CTR variation between 130% and 260% when designing bias networks to ensure reliable switching across all units. The wide operating temperature range makes it suitable for harsh environments where standard commercial grade parts might fail.

Part Context

This part belongs to the EL3H7-G series of ultra-small SSOP optocouplers from Everlight. The series is characterized by its compact 4-pin package and high isolation voltage. The EL3H7(B)(TA)-VG specifically denotes the B-bin CTR variant and TA tape-and-reel packaging configuration. It serves as a modern replacement for larger DIP packages in space-constrained designs requiring robust electrical isolation.

Replacement Considerations

Direct substitutes within the same family include EL3H7(C)(TA)-VG and EL3H7(TA)-VG, which share identical pinouts and mechanical dimensions but differ in Current Transfer Ratio specifications. Verify that the alternative CTR range meets the circuit's minimum drive requirements before substitution.