TCMT1104

Overview

The TCMT1104 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It integrates an NPN phototransistor optically coupled to a gallium arsenide infrared-emitting diode within a compact 4-SOP surface-mount package. The device provides an isolation voltage of 3750 Vrms and supports a maximum collector-emitter voltage of 70 V with a continuous collector current of 50 mA. Key electrical characteristics include a forward current rating of 60 mA, a typical forward voltage of 1.35 V, and a saturation voltage of 300 mV. The current transfer ratio ranges from 160% to 320%, with rise and fall times typically specified at 5.5 µs and 7 µs respectively, ensuring reliable signal transmission across isolated circuits.

Feature Summary

• Integrates a gallium arsenide infrared-emitting diode with an NPN phototransistor for efficient optical coupling
• Provides robust electrical isolation rated at 3750 Vrms between input and output circuits
• Designed for surface-mount assembly in a compact 4-lead SOP package to optimize board space

Applications

• Signal isolation in microprocessor-based control systems
• Interface circuits for solid-state relays
• Isolation barriers in industrial communication networks

Procurement Notes

Verify the specific ordering suffix (e.g., TR, CT) to confirm the packaging format, as the base part number may be available in tape-and-reel or cut-tape configurations. Confirm RoHS compliance status and moisture sensitivity level requirements against project specifications before finalizing procurement orders.

Selection Notes

Select this component when a surface-mount solution is required for high-voltage isolation applications. The 3750 Vrms rating makes it suitable for demanding industrial environments. Ensure the 50 mA collector current capability meets the load requirements of the downstream circuitry and that the SOP footprint aligns with the PCB design constraints.

Part Context

This device belongs to the TCMT11xx series of transistor output optocouplers. The series offers various pin configurations and insulation voltages, with the TCMT1104 specifically providing a standard single-channel configuration in a small outline package. It serves as a cost-effective alternative to through-hole DIP variants like the TCET1104G for automated surface-mount production lines.

Replacement Considerations

The TCET1104G is a functional equivalent offering identical electrical performance but utilizes a DIP-4 through-hole package instead of the SOP form factor. Verify mechanical clearance and mounting method compatibility before substituting.