TCMT1108

Overview

The TCMT1108 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It features an NPN phototransistor output with a current transfer ratio ranging from 130% to 260%. The device supports a maximum forward current of 60 mA and offers high isolation voltage capabilities, with datasheets citing either 3750 Vrms or 5000 Vrms depending on the specific revision. Key electrical parameters include a collector-emitter saturation voltage of 300 mV, a maximum collector current of 50 mA, and a collector-emitter voltage rating of 70 V. Operating temperatures span from -40°C to +100°C.

Feature Summary

• Single-channel configuration with NPN phototransistor output
• High isolation voltage ratings for circuit protection
• Wide operating temperature range suitable for industrial environments
• Surface mount SOP-4 package design

Applications

• General purpose signal isolation in electronic circuits
• Interface between microcontrollers and high-voltage loads
• Power supply feedback loop isolation
• Digital communication line isolation

Procurement Notes

Verify the specific datasheet revision when ordering, as isolation voltage ratings may vary between 3750 Vrms and 5000 Vrms across different production batches. Confirm the package type is SOP-4 and ensure the manufacturer is Vishay Semiconductor Opto Division. Check RoHS compliance status directly on the official product page or datasheet before finalizing procurement decisions.

Selection Notes

Select this component when a surface-mount transistor output optocoupler is required for single-channel isolation. Ensure the application demands a current transfer ratio within the 130%-260% range and can accommodate a 60 mA forward current limit. Verify that the SOP-4 footprint fits the PCB layout constraints and that the 70 V collector-emitter voltage rating meets the load requirements.

Part Context

This part belongs to Vishay's portfolio of discrete semiconductors and optoisolators. It is designed for applications requiring reliable galvanic isolation between low-voltage control circuits and higher-voltage power stages. The TCMT1108 serves as a compact solution for noise reduction and safety separation in modern electronic systems utilizing surface mount technology.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult official cross-reference tools or contact Vishay sales for compatible alternatives based on specific pinout and electrical parameter requirements.