MTCH105-I/ST - 5-Ch Proximity/Touch Controller, TSSOP-14 | Microchip
料号： MTCH105-I/ST ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.31 | $13.10 |
| 100 | $1.13 | $113.00 |
| 500 | $0.97 | $485.00 |
| 1,000 | $0.85 | $850.00 |
MTCH105-I/ST 概述
A capacitive touch controller is a mixed-signal IC that measures changes in electrode capacitance caused by a human finger or conductive object approaching or touching a sensor pad. The MTCH105 sits within a hierarchy of capacitive sensing solutions, between simple discrete RC touch circuits and full-featured MCU-based touch libraries. As a turnkey "Direct Button Replacement" device, it eliminates the firmware burden typically associated with capacitive touch by translating proximity/touch state into five discrete logic outputs, letting designers replace mechanical switches with touch buttons while keeping the host MCU free for application tasks.
Key features of the MTCH105-I/ST include 5 sensor channels, 5 simple digital outputs, configurable sensitivity via the MTSA pin, configurable power mode via the MTPM pin, an integrated active guarding driver that reduces parasitic capacitance effects, and a wide operating voltage range from 2.05V to 3.6V. The device operates from a single supply rail and is designed for low average current consumption, enabling battery-powered products such as remote controls, IoT endpoints, and wearable human-machine interfaces.
From an architectural standpoint, the MTCH105 uses a charge-transfer measurement front-end coupled with a digital signal-processing engine that runs the noise-suppression optimization algorithm on each measurement cycle. The MTSA pin selects sensitivity presets, and the MTPM pin sets the active scan rate vs low-power standby trade-off. The active guard signal is driven in phase with the sensing waveform, cancelling parasitic capacitance to the sensor pad and dramatically extending touch range. The five open-drain (or push-pull, depending on datasheet configuration) outputs are simple logic-level signals that drive downstream MOSFETs, optocouplers, or GPIO inputs directly.
Typical applications for the MTCH105-I/ST include replacing mechanical buttons on white goods, audio mixer faders and rotary controls, smart-lighting wall switches, access-control keypads, proximity wake-up sensors in IoT nodes, and consumer remote-control touch surfaces. The TSSOP-14 footprint supports compact PCB layouts and is well suited to cost-sensitive designs.
When designing with the MTCH105-I/ST, place sensor pads on a top-layer copper pour with a thin dielectric overlay (typically 1-3 mm of plastic or glass), keep sensor traces short and surrounded by ground, and add a series resistor (typically 4.7 kohm to 47 kohm, see datasheet) near each sensor pin for noise immunity. Bypass VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin. Confirm EMC performance using the datasheet's reference design.
This page synthesizes distributor pricing for the TSSOP-14 variant, drop-in alternatives within the MTCH102/105/108 family and selected competitors, plus practical design notes drawn from the Microchip mTouch proximity/touch product family, information not consolidated on a single manufacturer or distributor page.
直接替换替代料： MTCH105-I/ST ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MTCH102-I/LT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MTCH105-I/ST 最大额定值与电气特性
| Product Type | Capacitive Proximity/Touch Controller |
| Number of Channels | 5 sensor inputs / 5 digital outputs |
| 输出类型 | Simple digital (active-low, per datasheet) |
| Operating Voltage (VDD) | 2.05 V to 3.6 V |
| Sensitivity Configuration | MTSA pin (multi-level preset) |
| Power Mode Configuration | MTPM pin (active / low-power) |
| Active Guard | Yes (integrated, drives guard ring in phase with sensor) |
| Noise Suppression | On-chip optimization algorithm |
| 工作温度范围 | -40 C to +85 C (industrial) |
| 封装 | 14-pin TSSOP (ST) |
| 安装类型 | Surface Mount |
| Host MCU Required | No (direct button replacement, no firmware needed) |
| RoHS 状态 | Compliant |
| Family | mTouch MTCH102/105/8 |
MTCH105-I/ST 引脚配置
| 引脚 1 | VDD — Power supply input (2.05V to 3.6V) |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | MTSA — Sensitivity configuration pin (preset selection) |
| 引脚 4 | MTPM — Power mode configuration pin (active scan vs low-power) |
| 引脚 5 | SENS1 — Sensor input channel 1 |
| 引脚 6 | SENS2 — Sensor input channel 2 |
| 引脚 7 | SENS3 — Sensor input channel 3 |
| 引脚 8 | SENS4 — Sensor input channel 4 |
| 引脚 9 | SENS5 — Sensor input channel 5 |
| 引脚 10 | OUT1 — Digital output for channel 1 |
| 引脚 11 | OUT2 — Digital output for channel 2 |
| 引脚 12 | OUT3 — Digital output for channel 3 |
| 引脚 13 | OUT4 — Digital output for channel 4 |
| 引脚 14 | OUT5 — Digital output for channel 5 |
典型应用
MTCH105-I/ST 适用于 6 应用s: White Goods Button Replacement, Smart-Lighting Wall Switches, Audio Mixer Fader and Button Replacement, Access Control Keypads, IoT Proximity Wake-Up Sensors, Consumer Remote Control Touch Surfaces.
White Goods Button Replacement
The MTCH105-I/ST's 5 simple digital outputs make it a direct mechanical-switch replacement on washing machines, dishwashers, and induction cooktops where designers want sealed, easy-to-clean touch interfaces. With VDD from 2.05V to 3.6V it drops directly onto 3.3V rails commonly used in white-goods MCUs, and its -40C to +85C industrial temperature range covers both cold-start kitchen use and high-ambient dryer environments. Five discrete outputs drive LED indicators and external MOSFETs without host firmware, removing a software dependency from the bill of materials and shortening time to market for white-goods designs.
推荐
Smart-Lighting Wall Switches
The MTCH105-I/ST enables 5 capacitive touch zones per IC for multi-gang smart switches without firmware complexity. Its integrated noise-suppression algorithm rejects interference from mains wiring and compact fluorescents, and the active guard driver cancels parasitic capacitance from the surrounding PCB ground pour, letting designers route switch traces near mains-side conductors without false triggers. Each touch output directly drives a low-side MOSFET or optocoupler, simplifying the bill of materials. The 2.05-3.6V VDD range supports both 3.3V and battery-backed designs, including wireless retrofit smart switches.
推荐
Audio Mixer Fader and Button Replacement
The MTCH105-I/ST replaces mechanical linear faders and push buttons on audio mixers and DJ controllers with reliable capacitive sensing that never wears mechanically. The advanced optimization algorithm suppresses audio-band EMI from nearby analog stages, a benefit highlighted in Microchip forum discussions about mixer fader applications. Five channels map directly to a 5-fader strip with no host MCU load. Operating from 2.05-3.6V, it pairs with 3.3V digital audio processors, and the active guard driver lets designers run sensor traces near audio circuitry without injecting switching noise.
推荐
Access Control Keypads
The MTCH105-I/ST's 5 channels can be matrixed into a 5-key or larger keypad using diode steering, replacing mechanical key switches in access-control panels and security keypads. Its integrated noise-suppression algorithm tolerates the conducted and radiated noise from long cable runs and reader antennas. Operating from 2.05-3.6V allows battery-backed designs with uninterrupted operation during power glitches. The -40C to +85C industrial range supports outdoor and industrial-cabinet installations. Discrete outputs drive tamper detection and LED backlighting without consuming GPIO on the host MCU.
推荐
IoT Proximity Wake-Up Sensors
The MTCH105-I/ST wakes an IoT node from deep sleep when a user approaches, using one of its 5 channels as a proximity sensor and the MTPM pin to set a low-power scan rate. Average current stays low enough for coin-cell designs, while its 2.05-3.6V VDD range is fully compatible with single-cell Li-Ion or 2x alkaline battery stacks. The on-chip noise-suppression algorithm rejects ambient electrical noise so proximity detection remains reliable near switch-mode power supplies. Five channels allow multi-zone wake-up: approach, contact, gesture detection, all without host MCU intervention.
推荐
Consumer Remote Control Touch Surfaces
The MTCH105-I/ST enables sealed touch interfaces on TV remotes, streaming-device controllers, and universal remote controls, replacing rubber-dome keypads that wear out and collect dirt. Its 5-channel count covers a typical D-pad plus 4 buttons, all decoded without a host MCU. The 2.05-3.6V VDD range maps perfectly to two-cell alkaline or single-cell Li-Ion batteries, and the -40C to +85C industrial temperature range survives consumer handling and storage extremes. The active guard driver lets designers place the sensor directly under a thin plastic overlay with no external guard ring components.
推荐
推荐产品汇总
工程参考数据： MTCH105-I/ST ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MTCH105-I/SN | MTCH105-I/PG | MTCH102-I/LT |
|---|---|---|---|---|
| Package | TSSOP-14 | SOIC-14 (wider pin pitch, different footprint) | SPDIP-14 (through-hole, different footprint) | TSSOP-14 (same footprint) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Number of Channels | 5 sensor / 5 output | 5 sensor / 5 output (same) | 5 sensor / 5 output (same) | 2 sensor / 2 output |
| Operating Voltage | 2.05 V to 3.6 V | 2.05 V to 3.6 V (same) | 2.05 V to 3.6 V (same) | 2.05 V to 3.6 V (same) |
| Temperature Grade | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
| Output Type | Simple digital (5 discrete outputs) | Simple digital (5 discrete outputs) | Simple digital (5 discrete outputs) | Simple digital (2 discrete outputs) |
| Active Guard Driver | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) |
| Noise Suppression Algorithm | On-chip (advanced optimization) | On-chip (same algorithm) | On-chip (same algorithm) | On-chip (same algorithm) |
| Host MCU Required | No | No | No | No |
| RoHS Status | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Direct button replacement - no host MCU firmware required （对比 Texas Instruments FDC1004)
- 5 channels in compact TSSOP-14 with active guard driver （对比 MTCH102 (2-channel) in the same MTCH102/105/108 family)
- Industrial -40C to +85C temperature grade in TSSOP-14 （对比 Consumer-grade capacitive touch controllers (e.g., AT42QT1010))
设计说明
Place sensor pads on the top copper layer with a thin (typically 1-3 mm) dielectric overlay of plastic, glass, or acrylic. Keep sensor traces short and route them away from noisy digital and switching power traces. Surround each sensor with a grounded guard ring driven by the MTCH105's active guard driver (the MTCH105 itself drives this; no external guard driver required). A 4.7 kohm to 47 kohm series resistor at each SENS pin improves ESD and conducted-noise immunity per the MTCH102/105/108 datasheet.
Bypass VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the VDD pin. For battery-powered designs, set the MTPM pin to its low-power mode during standby and switch to active mode via host GPIO only when proximity/touch scanning is required. Average supply current in low-power scan mode is dramatically lower than in active mode, so duty-cycling the MTPM pin is the primary lever for extending battery life on coin-cell designs.
Do not route sensor traces directly over a ground plane on an adjacent layer - the increased parasitic capacitance reduces touch sensitivity and may require extreme MTSA pin settings. Keep the sensor and its routing free of solder mask variations and copper pour edges that change capacitance. Verify touch performance across the full -40C to +85C industrial temperature range, not just at room temperature; some dielectric overlays shift capacitance substantially with temperature.
For best noise immunity, route the MTSA and MTPM configuration traces away from any high-impedance analog signal paths; the MTSA pin reads a preset voltage and should be tied directly to VDD, GND, or left floating per the datasheet's preset table, never through a long trace that picks up noise. Keep the TSSOP-14 GND pin connected to a low-impedance ground pour that extends under the IC. For multi-channel scanning with shared noise sources, use the MTCH105's optimization feature rather than attempting to filter noise externally.
合规信息
RoHS compliant per Lisleapex and Microchip product page. Not AEC-Q100 qualified - the mTouch MTCH102/105/108 family is targeted at industrial and consumer applications, not automotive safety-critical use. Industrial temperature grade -40C to +85C is standard for the I/ST suffix.
