Quad Channel Transistor Output Optocoupler, 16-Pin DIP, 50mA, 7.5kV, 50%

The TLP521-4 from Isocom is a high-performance through-hole optically coupled isolator, designed for robust signal isolation in demanding electronic environments. Housed in a standard 16-pin DIP package, it integrates an infrared light-emitting diode (LED) and an NPN silicon phototransistor in each of its four isolated channels.

This optocoupler is engineered to ensure reliable signal transmission between systems operating at different potentials and impedances, making it a cornerstone component in industrial control systems. Its key feature is a high current transfer ratio (CTR) of 50%, which guarantees efficient signal coupling and strong output drive capability. Furthermore, it boasts a very high isolation voltage of 7.5kV, providing a critical safety barrier against voltage surges and ground loops that could damage sensitive equipment.

Its durable construction and recognised safety certifications make it suitable for high-reliability applications where data integrity and system protection are paramount. With a maximum forward current of 50mA and a minimum collector-emitter voltage (BVCEO) of 55V, it offers both the drive strength and voltage tolerance needed for interfacing digital logic with power circuits.

Key Specifications & Features

• High Isolation: 7.5kV isolation voltage protects sensitive circuits.
• Efficient Coupling: 50% minimum current transfer ratio ensures strong signal integrity.
• Robust Output: High BVCEO of 55V (min) provides good voltage withstand capability.
• Quad Configuration: Four independent isolation channels in a single package save board space.
• Safety Approved: UL E91231 recognised for compliance with international safety standards.
• Forward Current: Maximum forward current rating of 50mA.
• Through-Hole Design: DIP package is easy to prototype with and suitable for wave soldering.

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