EL817(M)(A)-G

Overview

The EL817(M)(A)-G is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It features an infrared emitting diode optically coupled to an NPN phototransistor in a DIP-4 package with 0.4-inch lead spacing. The device provides 5000 Vrms isolation voltage and operates within a temperature range of -55°C to +110°C. Key electrical parameters include a maximum collector-emitter voltage of 35V, a collector current of 50mA, and a power dissipation of 200mW. The current transfer ratio varies by suffix, typically ranging from 50% to 600% at IF=5mA.

Feature Summary

• High isolation voltage capability between input and output circuits
• Compact dual-in-line package with extended lead spacing for through-hole mounting
• Compliance with international safety standards including UL, VDE, and CSA approvals

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops
• Microcontroller interface circuits

Procurement Notes

Verify the specific Current Transfer Ratio (CTR) bin required for your application, as the 'A' suffix denotes a specific gain range distinct from other variants like B or C. Confirm that the M-type package dimensions match your PCB footprint requirements. Ensure the G suffix indicates RoHS compliance if environmental regulations apply to your manufacturing process. Cross-reference the datasheet revision date to ensure parameter accuracy.

Selection Notes

Select this component when high isolation voltage is critical for safety compliance in low-speed digital signaling applications. The M-package variant is specifically chosen for its wider lead pitch, facilitating easier manual assembly or compatibility with specific legacy board layouts. Consider the CTR tolerance bands provided by the suffix letters to ensure sufficient noise margin in the receiving circuit without excessive drive current.

Part Context

The EL817 series is a widely recognized standard in the optocoupler market, serving as a general-purpose isolation device. The M-suffix specifically differentiates the physical package geometry from the standard EL817, offering a 10.16mm lead spacing compared to the standard 7.62mm. This variation maintains the same electrical performance characteristics while adapting to different mechanical integration needs.

Replacement Considerations

Direct pin-compatible replacements include the EL817 standard DIP-4 version for non-spacing-critical designs. Other manufacturers offer equivalents such as PC817 or LTV-817, but verify CTR ranges and isolation ratings carefully. Substitutes must match the 35V Vceo and 50mA Ic limits to ensure circuit reliability.