EL817(B)-V

Overview

The EL817(B)-V 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 housed in a standard DIP-4 package. The device provides high isolation voltage of 5000 Vrms between input and output circuits. Key electrical parameters include a maximum collector-emitter voltage of 35 V, a maximum forward current of 60 mA, and a power dissipation rating of 200 mW. The typical rise and fall times are specified at 4 µs and 3 µs respectively, with a minimum current transfer ratio of 50% at IF = 5mA and VCE = 5V.

Feature Summary

• High isolation voltage capability between input and output sides
• Compact dual-in-line package design for through-hole mounting
• Compliant with RoHS standards and lead-free construction

Applications

• General-purpose signal isolation in electronic circuits
• Interface between microcontrollers and high-voltage loads
• Switching applications requiring galvanic isolation

Procurement Notes

Verify the specific suffix designation when ordering, as variations such as VG or B may indicate differences in packaging type, lead configuration, or manufacturing lot specifications. Confirm that the component meets all required safety certifications for the target application region, including UL, VDE, and SEMKO approvals. Ensure the selected variant aligns with the intended thermal management and mechanical mounting constraints of the final assembly.

Selection Notes

Select this component based on its 5000 Vrms isolation rating and 35 V collector-emitter voltage limit suitable for low-to-medium voltage switching tasks. Consider the 60 mA maximum forward current constraint when designing the input drive circuitry. Evaluate the 200 mW power dissipation requirement against the expected operating temperature range of -55 °C to +110 °C to ensure reliable long-term performance under thermal stress conditions.

Part Context

The EL817 series represents a widely used family of photocouplers from Everlight Electronics. These devices consist of an infrared LED coupled to a phototransistor, providing electrical isolation while transmitting signals. The series offers various package options and certification levels, making it a versatile choice for industrial and consumer electronics where cost-effective isolation is required.

Replacement Considerations

Direct substitutes within the same series include EL817M, EL817S, and EL817S1, which differ primarily in lead spacing or surface-mount configurations. Other generic equivalents exist but require verification of pinout compatibility and electrical parameter alignment before implementation.

FAQ

What is the maximum isolation voltage of the EL817(B)-V?

The device supports a maximum isolation voltage of 5000 Vrms between the input LED and the output phototransistor.

Does the EL817(B)-V support surface mount technology?

No, the standard EL817(B)-V is designed for through-hole mounting in a DIP-4 package. Surface mount variants typically carry different suffixes such as S or S1.