TCMT1118

Overview

The TCMT1118 is a single-channel transistor output optocoupler manufactured by Vishay Semiconductor Opto Division. It integrates a gallium arsenide infrared-emitting diode with a phototransistor in a half-pitch Mini-Flat 4-pin surface-mount package. The device features a nominal current transfer ratio of 130% at 5mA, with a minimum collector-emitter breakdown voltage of 70V and a maximum dark power supply of 100nA. It supports an AC isolation test voltage of 3750 V RMS and operates within an ambient temperature range of -40°C to 110°C.

Feature Summary

• Low profile half-pitch Mini-Flat package design
• High AC isolation test voltage of 3750 V RMS
• Low coupling capacitance for signal integrity
• UL recognized and VDE approved for safety compliance

Applications

• General purpose digital signal isolation
• Microprocessor input/output interface circuits
• Solid-state relay driver applications
• Isolated switching power supply feedback loops

Procurement Notes

Verify the specific CTR binning group required for your application, as the datasheet indicates selection into groups rather than a single fixed value. Confirm that the 4-SOP (Mini-Flat) package dimensions align with your PCB footprint constraints. Ensure that the operating temperature range up to 110°C meets your environmental specifications. Cross-reference agency approvals such as UL1577 and VDE requirements against your target market regulations before finalizing component selection.

Selection Notes

Select this component when high isolation voltage and compact surface-mount packaging are prioritized over high-speed performance. The phototransistor output suits applications where moderate switching speeds are acceptable. Consider the low coupling capacitance for noise immunity in sensitive analog or digital interfaces. Evaluate the thermal management capabilities given the wide operating temperature range and ensure the forward current limits are not exceeded during peak operation conditions.

Part Context

The TCMT1118 belongs to the TCMT series of optocouplers from Vishay, designed for space-constrained applications requiring robust electrical isolation. This series utilizes a half-pitch package to reduce board area while maintaining high isolation standards. The device is part of Vishay's portfolio of lead-free and RoHS compliant components, catering to modern electronics manufacturing standards and environmental regulations.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout compatibility and isolation voltage ratings if considering alternative manufacturers' devices. Ensure that any replacement maintains the same 4-pin Mini-Flat package form factor to avoid PCB redesign.

FAQ

What is the typical coupling capacitance of the TCMT1118?

The typical coupling capacitance is 0.3 pF.

Does the TCMT1118 have VDE approval?

Yes, the device is VDE approved in addition to being UL recognized under file number E76222.

What is the maximum operating temperature for this optocoupler?

The highest operating temperature is 110 °C.