EL817(A)

Transistor, Photovoltaic Output Optoisolators Overview

The EL817(A) is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features a GaAs infrared LED coupled to an NPN silicon phototransistor in a compact DIP-4 package. The device provides high isolation voltage of 5000 Vrms between input and output circuits. Key electrical parameters include a minimum current transfer ratio (CTR) of 50% at IF=5mA and VCE=5V, a collector-emitter breakdown voltage of 35V, and a maximum forward current of 50mA. It operates within a temperature range of -55°C to 110°C and is RoHS compliant.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• High isolation voltage capability of 5000 Vrms between input and output
• Compact dual-in-line package design suitable for through-hole mounting
• Compliant with major international safety standards including UL, VDE, and SEMKO

Transistor, Photovoltaic Output Optoisolators Applications

• Signal isolation in industrial control systems
• Power supply feedback loops
• Microcontroller interface circuits

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific suffix designation when ordering, as variations such as M, S, or TA indicate different lead configurations or tape-and-reel packaging options. Confirm compliance requirements against the latest datasheet revisions. Ensure the selected variant matches the required CTR binning specifications for the application circuit design.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select the EL817(A) for applications requiring reliable galvanic isolation with standard transistor output characteristics. Consider the CTR range and operating temperature limits when designing biasing networks. Evaluate mechanical constraints regarding the DIP-4 footprint and lead spacing before finalizing the PCB layout.

Transistor, Photovoltaic Output Optoisolators Part Context

The EL817 series is a widely used family of photocouplers from Everlight Electronics. The base model serves as a general-purpose isolator, while variants like the EL817A specify tighter performance tolerances. This component belongs to the broader category of transistor output optocouplers designed for cost-effective signal transmission across isolated boundaries.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Direct substitutes may include other 4-pin DIP transistor optocouplers with similar isolation ratings and pinouts. Verify compatibility of current transfer ratios and voltage ratings before swapping components in existing designs.