TCLT1018

Overview

The TCLT1018 is a single-channel optoisolator manufactured by Vishay Semiconductor Opto Division, featuring a phototransistor output with an accessible base terminal. It provides 5000Vrms isolation voltage and operates within a temperature range of -55°C to 110°C. The device utilizes a low-profile 4-lead SMD package (SOP-6L4). Key electrical parameters include a maximum collector-emitter voltage of 80V, a DC forward current limit of 60mA, and a typical turn-on/turn-off time of 3µs/4.7µs. The current transfer ratio ranges from 130% to 260% at 5mA input.

Feature Summary

• Features a phototransistor output with an exposed base terminal for enhanced control and speed optimization
• Provides high isolation capability rated at 5000 VRMS between input and output circuits
• Utilizes a compact, low-profile surface-mount package designed for space-constrained applications

Applications

• General purpose signal isolation in industrial control systems
• Interface circuits for microcontrollers and logic devices requiring galvanic separation
• Power supply feedback loops and monitoring circuits

Procurement Notes

Verify the specific order suffix to confirm the exact Current Transfer Ratio (CTR) bin, as Vishay offers multiple CTR variants for this model. Ensure the selected package variant matches the required PCB footprint, specifically the SOP-6L4 configuration. Confirm that the operating temperature range meets the environmental requirements of the target application before finalizing procurement orders.

Selection Notes

Select the TCLT1018 when a phototransistor output with base access is required for faster switching or linear operation compared to standard configurations. Consider the 5000VRMS isolation rating for safety-critical interfaces. Evaluate the CTR specifications against the driving circuit capabilities to ensure sufficient output current. Verify compatibility with the 80V collector-emitter voltage limit in the load circuit design.

Part Context

The TCLT1018 belongs to Vishay's family of transistor-output optoisolators designed for general-purpose isolation. It shares architectural similarities with models like the TCLT1103 but differs in package style and specific electrical characteristics. This component is part of a broader lineup offering various isolation voltages and output types, serving as a standard solution for digital signal transmission across isolated boundaries.

Replacement Considerations

Direct replacements must match the 5000VRMS isolation rating and phototransistor output type. Models such as the TCLT1103 offer similar functionality but utilize a different 6-SOP package. Verify pinout compatibility and thermal performance when substituting. Ensure the replacement device supports the required base terminal access if external base control is utilized in the design.