EL4503

Overview

The EL4503 is a high-speed optocoupler manufactured by Everlight Electronics Co Ltd. It features an 8-pin DIP package and provides one channel of isolation with a rated insulation voltage of 5000 Vrms. The device utilizes a transistor output configuration and supports data rates up to 1 Mb/s. Key electrical parameters include a forward current of 16 mA, a forward voltage of 1.45 V, and a reverse voltage rating of 5 V. Power dissipation is specified at 100 mW, and the unit operates within a temperature range of -55°C to +100°C.

Feature Summary

• High-speed signal transmission capability supporting 1 Mb/s data rates
• Robust electrical isolation with 5000 Vrms insulation voltage rating
• Transistor output configuration for digital signal interfacing

Applications

• Industrial communication systems requiring galvanic isolation
• Microcontroller input/output isolation interfaces
• Signal transmission in noisy electrical environments

Procurement Notes

Verify the specific ordering suffix and packaging format against official Everlight documentation before procurement. Confirm that the component meets required environmental standards and operating temperature ranges for the intended application. Ensure compatibility with existing PCB footprints and assembly processes. Cross-reference part numbers with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when high-speed digital isolation is required between circuits. The 1 Mb/s data rate suits most standard serial communication protocols. Consider the 8-DIP package for through-hole mounting requirements. Evaluate the 5000 Vrms isolation barrier for safety compliance in mains-connected applications. Verify that the transistor output type aligns with the receiving circuit's input impedance.

Part Context

The EL4503 belongs to Everlight's family of high-speed optocouplers designed for reliable digital signal transfer. It serves as a bridge between low-voltage logic circuits and higher-voltage or noisy domains. The device integrates an infrared emitting diode with a phototransistor detector within a single encapsulated unit. This architecture ensures compact design while maintaining strict electrical separation between input and output sides.

Replacement Considerations

Consult official Everlight documentation for confirmed substitute part numbers. Verify pinout compatibility and electrical parameter equivalence before substitution.