MTCH108T-I/GZ

Overview

The MTCH108T-I/GZ is an 8-channel capacitive proximity and touch controller manufactured by Microchip Technology. It operates within a voltage range of 2.05V to 3.6V and supports an industrial temperature range from -40°C to +85°C. The device features eight sensor inputs (MTI0–MTI7) with active guarding capability on MTI2, paired with corresponding open-drain digital outputs (MTO0–MTO7). Sensitivity and power modes are configurable via the MTSA and MTPM pins. It utilizes multi-stage noise suppression filters and automatic environmental compensation for reliable detection. The component is supplied in a 20-lead QFN package.

Feature Summary

• Implements capacitive sensing with active guarding to shield sensor traces from nearby noise sources or power planes.
• Integrates advanced optimization algorithms and multi-stage active noise suppression filters to ensure reliable signal integrity.
• Provides flexible low-power mode selection through hardware pin configuration to balance response time and energy consumption.
• Includes brown-out protection and threshold hysteresis to maintain stable operation under varying electrical conditions.

Applications

• Light switch activation systems
• Portable device enablers
• White goods and appliance controls
• Office equipment and toys
• Display and keypad back-lighting activation

Procurement Notes

Verify the specific ordering suffix 'T' indicates tape-and-reel packaging when sourcing components. Confirm that the '-I' designation corresponds to the required industrial temperature rating for your operational environment. Ensure compatibility with the 20-lead QFN footprint during PCB layout. Cross-reference the datasheet revision date against your design requirements to account for any updates in electrical characteristics or pin definitions.

Selection Notes

Select this component when an application requires multiple independent touch or proximity channels without complex microcontroller integration. The MTCH108 provides dedicated digital outputs for each channel, simplifying interface logic. Consider the active guard feature if the design environment contains significant electromagnetic interference. Evaluate the sensitivity adjustment options to accommodate various sensor sizes and shapes effectively.

Part Context

This part belongs to the Microchip mTouch MTCH10x family, which includes the MTCH102 and MTCH105 variants. These devices share similar core functionalities but differ in channel count and package options. The MTCH108 specifically offers eight channels, making it suitable for more complex interfaces compared to the dual-channel MTCH102 or five-channel MTCH105.

Replacement Considerations

Direct substitutes within the same family include the MTCH105 for applications requiring fewer channels. Verify package compatibility when considering alternative packages such as TSSOP or SOIC, as pinouts may vary. Ensure that any replacement maintains the required operating voltage and temperature specifications.