TLP557(F)

Overview

The TLP557(F) is a logic output optocoupler manufactured by Toshiba Semiconductor and Storage, featuring an 8-lead DIP package. It integrates a GaAlAs LED with a photodetector for signal isolation. Key electrical parameters include a minimum isolation voltage of 2500Vrms, a maximum switch propagation delay of 5µs, and rise/fall times of 50ns. The device supports a supply voltage range of 5V to 13V, with a maximum output current of ±0.3A. It operates within a temperature range of -30°C to +70°C and requires an external resistor between pins 6 and 7 for constant current drive.

Feature Summary

• Integrates a GaAlAs light emitting diode and an integrated photodetector for high-speed signal transmission.
• Provides robust electrical isolation with a minimum isolation voltage of 2500Vrms.
• Features fast switching characteristics with a maximum propagation delay of 5 microseconds.
• Capable of driving power transistors such as IGBTs and MOSFETs directly.

Applications

• Communication interfaces
• PLC (Programmable Logic Controllers)
• Measurement instrumentation
• IGBT/MOSFET gate or base drive circuits

Procurement Notes

Verify the specific suffix designation when ordering, as the TLP557(F) variant may have distinct manufacturing status compared to the standard TLP557. Confirm compliance with RoHS directives and lead-free requirements. Ensure the procurement source provides valid UL 1577 certification documentation. Check for end-of-life notifications or obsolescence warnings from Toshiba Semiconductor and Storage before finalizing purchase orders.

Selection Notes

Select this component for applications requiring high-speed digital isolation with moderate output current capabilities. The 8-pin DIP package facilitates through-hole mounting in industrial control systems. Consider the requirement for an external resistor on pin 7 when designing the driver circuit. Verify that the operating temperature range meets the environmental conditions of the target application.

Part Context

The TLP557 belongs to Toshiba's family of logic output optocouplers designed for industrial and communication applications. Manufactured in Japan, it utilizes GaAlAs technology for efficient light emission. The device is part of a broader series including variants like the TLP550, though specific electrical characteristics differ. It serves as a critical interface component for isolating low-voltage control signals from high-voltage power stages.

Replacement Considerations

Toshiba lists the TLP5702(E) as a similar alternative. Verify pin compatibility and electrical specifications against the original design requirements before substitution.

FAQ

What is the function of the external resistor connected between pins 6 and 7?

The external resistor is required to set the constant current for the output stage, ensuring stable operation of the photodetector.

What is the maximum propagation delay of the TLP557(F)?

The maximum switch propagation delay time (tpLH/tpHL) is 5 microseconds.