QT113B-ISG

Overview

The QT113B-ISG is a charge-transfer touch sensor IC from Microchip Technology's QProx family, designed for proximity and touch detection. It operates on a single supply voltage ranging from 2.5V to 5.5V with a typical supply current of 600µA. The device features a 14-bit resolution and supports up to one input channel. It utilizes an active-low output configuration and includes continuous autocalibration capabilities. The component is housed in an 8-SOIC package (0.154 inch width) and functions within a temperature range of -40°C to 85°C.

Feature Summary

• Projects a proximity sensing field through air and various dielectric materials such as glass, plastic, and wood.
• Enables self-calibration throughout the product lifecycle without requiring manual adjustments.
• Converts small metal-bearing objects into intrinsic sensors responsive to proximity or touch.

Applications

• Elevator buttons
• Toys and games
• Access systems
• Appliance control

Procurement Notes

Verify the specific suffix ISG against official Microchip documentation to confirm package type and output polarity. Confirm RoHS compliance status as historical records indicate variations within the QT113 series. Check current availability status as older revisions may be discontinued. Ensure the design accounts for the single external capacitor requirement specified in the datasheet.

Selection Notes

Select this component when a low-cost, single-channel capacitive touch solution is required. The QT113B-ISG is suitable for applications needing simple toggle mode control via strap options. Consider the 600µA supply current for battery-operated devices. Verify that the 8-SOIC package fits the PCB layout constraints and that the active-low output logic matches the system interface requirements.

Part Context

The QT113B-ISG belongs to the QProx series of charge-transfer touch sensors developed by Microchip Technology. This series is engineered to replace mechanical switches with solid-state alternatives. The part integrates proximity sensing and touch detection capabilities into a compact digital IC, allowing designers to create intuitive user interfaces with minimal external components.

Replacement Considerations

Officially documented substitutes include the QT113-DG, QT113-G, and QT113-ISG from Quantum Research Group. These parts share similar charge-transfer touch sensor functionality. Verify pinout compatibility and electrical specifications before substitution.