TCLT1118

Overview

The TCLT1118 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It integrates a gallium arsenide infrared-emitting diode with a phototransistor featuring a base connection for enhanced switching speed. The device utilizes a six-pin SOP package (6-SOP) with a half-pitch configuration. Key electrical specifications include an isolation voltage of 5000 Vrms and a current transfer ratio (CTR) ranging from 130% to 260% at a forward current of 5 mA. The component supports an operating temperature range of -40 °C to +100 °C.

Feature Summary

• Phototransistor output with base terminal for improved switching performance
• High insulation voltage rating of 5000 Vrms
• Low coupling capacitance typical of 0.3 pF
• Half-pitch mini-flat six-pin SOP package design

Applications

• Industrial control systems requiring galvanic isolation
• Communication equipment signal transmission
• Power supply feedback circuits
• Microcontroller input interfacing

Procurement Notes

Verify the specific CTR binning group required for your application, as the datasheet specifies a range of 130% to 260%. Confirm that the 6-SOP package dimensions align with your PCB footprint constraints. Ensure that the 5000 Vrms isolation rating meets the safety standards of your target market, such as UL or VDE approvals. Check for any recent product change notifications regarding material compliance or manufacturing site updates before finalizing orders.

Selection Notes

Select the TCLT1118 when high-speed switching is critical compared to standard phototransistor couplers, due to its base-connected phototransistor structure. Choose this component if a compact six-pin surface-mount package is preferred over traditional DIP formats. Consider the wide operating temperature range for environments subject to thermal fluctuations. Evaluate the CTR requirements against the 130-260% specification to ensure adequate noise margin in your circuit design without exceeding maximum ratings.

Part Context

This component belongs to the TCMT111X series family, which includes variants like TCMT1117 and TCMT1118. These devices share similar architectural features but differ in packaging and specific electrical characteristics. The TCLT1118 represents the surface-mount SOP variant within this lineage, offering comparable optical isolation capabilities in a form factor suitable for automated assembly processes. It serves as a modern alternative to through-hole options while maintaining industry-standard isolation performance metrics.

Replacement Considerations

Direct substitutes may include other Vishay parts within the TCMT111X series, such as TCMT1117 or TCMT1118, provided the package type difference is acceptable. Cross-brand replacements require careful verification of pinout compatibility, isolation voltage ratings, and CTR ranges. Ensure that any alternative component matches the 6-pin SOP footprint and maintains equivalent switching speed characteristics.