Microchip Technology MTCH108T-I/GZ

Overview

MTCH108T-I/GZ from Microchip Technology is an 8-channel capacitive proximity and touch controller with active guarding, operating from 2.05V to 3.6V over –40°C to +85°C, featuring configurable sensitivity via MTSA pin and low-power mode selection via MTPM pin for applications such as appliance control panels and display backlight activation.

For engineers reviewing the MTCH108T-I/GZ datasheet, MTCH108T-I/GZ pinout, MTCH108T-I/GZ application, or MTCH108T-I/GZ equivalent, key selection criteria include channel count (8 sensor inputs), active guard capability on MTI2, open-drain digital outputs (MTO0–MTO7), and voltage-compatible interface with embedded microcontrollers in space-constrained consumer and industrial designs.

Technical Context

The MTCH108T-I/GZ implements a dedicated capacitive sensing engine with multi-stage active noise suppression and automatic environmental compensation, enabling reliable detection across varying humidity, temperature, and EMI conditions. It supports flexible scan scheduling and threshold hysteresis to prevent false triggers during transient noise events.

Its architecture allocates one sensor input (MTI2) as a configurable active guard output, driven in-phase with adjacent sensor traces to minimize coupling; all eight MTOx outputs are open-drain, requiring external pull-ups and asserting low on detection-enabling direct interfacing with 3.3V logic without level-shifting.

Key Specifications

Pinout & Package

MTCH108T-I/GZ is packaged in a 20-lead TSSOP (4.4 mm × 6.5 mm, 0.65 mm pitch) with exposed thermal pad. Pin functions are fully defined per DS40001780A-page 4 Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar proximity/touch controller applications.

Compared with MTCH105T-I/ML and CY8CMBR2016, the MTCH108T-I/GZ delivers the highest channel density with integrated active guard and self-contained digital outputs-ideal for standalone, low-latency, noise-critical touch interfaces where minimal MCU overhead is required.

Availability

MTCH108T-I/GZ is available at Aetrix Electronics and suitable for white goods, office equipment, and portable device enabler applications requiring stable component supply, long-term industrial lifecycle support, and consistent parametric performance across production batches.

Supply support for MTCH108T-I/GZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog, interface, and touch-sensing solutions with ISO/TS 16949-certified manufacturing.

The MTCH108T-I/GZ belongs to Microchip's mTouch® proximity/touch controller product line, designed specifically for robust, low-cost, and layout-tolerant capacitive sensing in cost-sensitive consumer and industrial appliances.

FAQ

What is the package type and footprint of MTCH108T-I/GZ?

The MTCH108T-I/GZ uses a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch) with an exposed thermal pad. Its pinout matches Table 5 in DS40001780A-page 4, and it is not pin-compatible with QFN variants of the MTCH108 family. Layout must accommodate the thermal pad connection to VSS for optimal thermal and electrical performance. The MTCH108T-I/GZ footprint differs from MTCH105 and MTCH102 packages.

Does MTCH108T-I/GZ require an external microcontroller to operate?

No - the MTCH108T-I/GZ operates autonomously: all sensing, noise suppression, and output generation occur internally. It delivers immediate active-low digital outputs (MTO0–MTO7) upon detection, needing only pull-up resistors and basic power/ground connections. An external microcontroller is optional for sensitivity tuning (MTSA) or power mode selection (MTPM), but not required for basic proximity/touch functionality in the MTCH108T-I/GZ.

How does active guarding work on MTCH108T-I/GZ?

On the MTCH108T-I/GZ, the MTI2 pin can be configured as an active guard output by grounding the MTO2/GC pin. When enabled, the MTCH108T-I/GZ drives MTI2 in-phase with adjacent sensor signals (e.g., MTI1 or MTI3), minimizing voltage differential and capacitively shielding those traces from noise sources like power planes or switching regulators - a hardware-level feature unique to the MTCH108T-I/GZ within its family.

What is the role of the MTSA pin on MTCH108T-I/GZ?

The MTSA pin on MTCH108T-I/GZ is an analog input that sets global sensitivity across all 8 channels: 0V yields maximum sensitivity (smallest detectable capacitance change), VDD yields minimum sensitivity, and intermediate voltages provide linear scaling. This eliminates need for per-channel calibration or firmware adjustment - the MTCH108T-I/GZ applies the same analog-derived threshold offset to all MTIx inputs, simplifying system design.

Can MTCH108T-I/GZ operate reliably in humid or wet environments?

Yes - the MTCH108T-I/GZ incorporates automatic environmental compensation and multi-stage active noise suppression, enabling stable operation under condensation or light moisture exposure. When combined with active guarding (MTI2/Guard) and proper overlay design (e.g., thick glass or plastic), the MTCH108T-I/GZ maintains detection integrity in white goods and outdoor kiosks - a key reliability feature validated across –40°C to +85°C and confirmed in Microchip's application testing for the MTCH108T-I/GZ.