TCMT1113

Overview

The TCMT1113 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It integrates a gallium arsenide infrared-emitting diode with an NPN phototransistor in a 4-pin Mini-Flat surface-mount package. Key electrical parameters include a maximum collector-emitter voltage of 70 V, a maximum collector current of 50 mA, and a forward voltage of 1.4 V at 50 mA. The device offers a current transfer ratio ranging from 100% to 300%, with typical rise and fall times of 5.5 µs and 7 µs respectively. It provides an AC isolation test voltage of 3750 VRMS and features low coupling capacitance.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits using a phototransistor configuration.
• Features a low-profile half-pitch Mini-Flat surface-mount package suitable for space-constrained designs.
• Ensures signal integrity through a stable current transfer ratio with a low temperature coefficient.

Applications

• High-voltage isolation interfaces in industrial control systems
• Signal transmission across isolated boundaries in power supply circuits
• Input/output isolation for microcontroller-based monitoring applications

Procurement Notes

Verify the specific Current Transfer Ratio (CTR) bin required for the application, as the TCMT1113 series offers selected groups ranging from 100% to 300%. Confirm that the 4-pin SOP package dimensions align with the target PCB footprint. Ensure compliance with RoHS directives and check agency approvals such as UL and VDE if safety certification is mandatory for the end product.

Selection Notes

Select the TCMT1113 when a compact, single-channel isolator with moderate speed and high isolation voltage is needed. Compare CTR requirements against the 100-300% range to ensure sufficient gain for the load. Consider the 70 V collector-emitter voltage limit for output circuit design. Evaluate thermal management needs given the operating temperature range and power dissipation characteristics of the Mini-Flat package.

Part Context

The TCMT1113 belongs to the TCMT111X series of Vishay, which includes variants like the TCMT1118. These components share the same physical Mini-Flat package and basic structural design but differ in their specified Current Transfer Ratio ranges. This series is designed for general-purpose isolation tasks requiring reliable performance in a small form factor.

Replacement Considerations

Direct substitutes within the same series include the TCMT1118, which offers a different CTR range (130-260%). Verify pinout compatibility and isolation voltage ratings before swapping. Other generic replacements must match the 4-pin SOP package, 3750 VRMS isolation, and similar electrical characteristics.

FAQ

What is the typical coupling capacitance of the TCMT1113?

The typical coupling capacitance is 0.3 pF, which helps minimize capacitive coupling effects across the isolation barrier.

Does the TCMT1113 support AC isolation testing?

Yes, the device is rated for an AC isolation test voltage of 3750 VRMS, ensuring robust insulation performance.