Toshiba TLP185 Optocoupler, 1 Channel, 4-Pin SOP, 100% CTR

The Toshiba TLP185(GR-TPL, SE(T)) is a high-performance photocoupler, featuring an infrared LED optically coupled to a phototransistor. This device provides reliable electrical isolation between input and output circuits, ensuring safety and signal integrity in a variety of electronic applications. It is particularly valued for its high current transfer ratio and robust isolation voltage.

This optocoupler offers a minimum Current Transfer Ratio (CTR) of 100%, ensuring efficient signal transmission. It is housed in a compact 4-pin SOP (SOIC) package, making it suitable for space-constrained PCBs. The device boasts a high isolation voltage of 3750Vrms, providing excellent protection against high-voltage transients and meeting critical safety standards.

Key electrical characteristics include a minimum collector-emitter voltage of 80V, a typical input forward voltage of 1.25V, and a very low typical OFF-state collector current of just 1µA, which contributes to its energy efficiency. Its wide operating temperature range of -55°C to +110°C ensures reliable performance in demanding industrial environments.

Key Applications

• Office Equipment: For signal isolation in printers, scanners, and copiers.
• Programmable Logic Controllers (PLCs): Provides essential isolation in industrial control and automation systems.
• AC Adapters & Power Supplies: Used for feedback loop isolation to ensure safety and regulation.
• I/O Interface Boards: Isolates sensitive logic circuits from higher voltage or noisy external signals.

The TLP185 is recognised under key international safety standards, including UL 1577 and cUL (CSA), giving designers confidence in its safety-critical performance. Its combination of high isolation, reliable CTR, and compact form factor makes it a trusted component for engineers designing robust and safe electronic systems.