TCMT1117

Overview

The TCMT1117 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 package. The device features an AC isolation test voltage of 3750 Vrms and a typical coupling capacitance of 0.3 pF. The current transfer ratio (CTR) is selected into groups ranging from 80% to 160% at a forward current of 5 mA. It operates within an ambient temperature range of -40°C to 110°C.

Feature Summary

• Integrates a gallium arsenide infrared-emitting diode with a phototransistor for optical signal transmission
• Provides high-voltage isolation capability through an AC isolation test voltage rating
• Features low coupling capacitance to support faster switching performance
• Utilizes a low-profile half-pitch Mini-Flat surface-mount package design

Applications

• General-purpose digital signal isolation
• Industrial control systems requiring galvanic isolation
• Measurement and testing equipment circuits
• Power supply feedback loops

Procurement Notes

Verify the specific CTR group designation required for the application, as the component is sorted into defined ranges. Confirm that the half-pitch Mini-Flat package dimensions align with the target PCB footprint constraints. Ensure compliance with relevant safety agency approvals such as UL1577 and VDE standards if used in certified end-products. Check for RoHS compliance status during sourcing.

Selection Notes

Select this component when a compact surface-mount solution with high isolation voltage is required. The wide operating temperature range supports demanding environments. Consider the CTR selection criteria to ensure adequate signal transfer at the intended drive current. Evaluate the low coupling capacitance benefit for applications sensitive to capacitive coupling noise or requiring higher speed than standard couplers.

Part Context

The TCMT1117 belongs to the TCMT111X series of optocouplers from Vishay. This series includes variants with different CTR specifications, such as the TCMT1118 which offers a higher current transfer ratio range. All members share the same physical package and basic electrical architecture, differing primarily in the gain characteristics of the internal phototransistor.

Replacement Considerations

Direct substitutes within the same series include the TCMT1118, which provides a higher CTR range of 130-260%. Other TCMT111X variants may be considered if their specific CTR groups match the circuit requirements. Verify pin compatibility and package dimensions before substitution.