MTCH108-I/SS - 8-Channel Proximity/Touch Controller IC | Microchip
Teilenummer: MTCH108/SS ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.66 | $16,60 |
| 100 | $1.42 | $142,00 |
| 500 | $1.18 | $590,00 |
| 1.000 | $0.96 | $960,00 |
MTCH108/SS Übersicht
A capacitive touch controller is a mixed-signal integrated circuit that measures capacitance changes caused by a user's finger on a sensor pad, converts the analog delta into a digital state, and outputs a clean logic-level signal. Within the broader semiconductor taxonomy, the MTCH108 sits in the hierarchy: capacitive touch controller -> touch screen / human-interface controller -> sensor IC -> mixed-signal semiconductor. It removes the firmware burden of touch processing by providing a hardware-only solution with no MCU programming required, making it ideal for low-MCU or pure-logic designs.
Key specifications include 8 simultaneous capacitive sensing inputs, an integrated guard-ring driver for moisture immunity, automatic calibration across sensitivity levels, and low active current suitable for battery-powered applications. The MTCH108 supports both proximity (hover) and direct-touch detection modes, enabling wake-on-approach behavior in IoT devices. The 20-pin SSOP package has standard 0.65 mm pitch and 5.30 mm body width for easy hand-soldering and visual inspection during prototyping.
Typical applications include consumer appliance control panels, industrial HMI keypads, automotive interior lighting controls, IoT smart-home touch buttons, and replacement of mechanical switches in sealed enclosures. The wide operating voltage range supports direct connection to 3.3 V rails commonly used by Microchip PIC and SAM microcontrollers, simplifying power-tree design.
When designing with the MTCH108, ensure the sensor pad geometry follows Microchip's layout guidelines to maximize SNR, and place a 100 nF decoupling capacitor within 5 mm of the VDD pin. The MTPM pin can be tied high for maximum sensitivity or low for lower power consumption depending on system requirements.
This page consolidates distributor stock, parametric drop-in alternatives (including the lower-channel MTCH102 and MTCH105), and practical PCB layout notes that complement - but do not replace - the manufacturer datasheet.
Drop-in-Alternativen für MTCH108/SS – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit MTCH108/SS (gleiche Bauform und Footprint) – abweichend in Noise Suppression, Package, Number of Digital Outputs, Operating Temperature Range, Sensitivity Configuration.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MTCH108T-I/SS
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MTCH108-I/GZ
✅ Drop-In✓ Auf Lager
$1.41 / Stück
Datenblatt ansehen →MTCH105-I/SS
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MTCH108/SS Grenzwerte & elektrische Eigenschaften
| Product Type | Capacitive Proximity/Touch Controller |
| Number of Channels | 8 |
| Number of Digital Outputs | 8 (1 per channel) |
| Operating Voltage (VDD) | 2.05 V to 3.6 V |
| Betriebstemperaturbereich | -40C to +85C (Industrial) |
| Sensitivity Configuration | MTSA pin (selectable) |
| Power Mode Configuration | MTPM pin (selectable) |
| Noise Suppression | Advanced optimization algorithm (on-die) |
| Proximity Detection | Yes (hover / wake-on-approach) |
| Direct Touch Detection | Yes (capacitive) |
| Guard-Ring Driver | Integrated (moisture immunity) |
| Automatic Calibration | Yes |
| Gehäuse | 20-pin SSOP (5.30 mm body, 0.65 mm pitch) |
| Montageart | Surface Mount |
| MSL-Level | 1 |
| RoHS-Status | Compliant |
| Lead-Free | Yes |
MTCH108/SS Pin-Konfiguration
| Pin 1 | CH0 — Capacitive sensing channel 0 input |
| Pin 2 | CH1 — Capacitive sensing channel 1 input |
| Pin 3 | CH2 — Capacitive sensing channel 2 input |
| Pin 4 | CH3 — Capacitive sensing channel 3 input |
| Pin 5 | CH4 — Capacitive sensing channel 4 input |
| Pin 6 | CH5 — Capacitive sensing channel 5 input |
| Pin 7 | CH6 — Capacitive sensing channel 6 input |
| Pin 8 | CH7 — Capacitive sensing channel 7 input |
| Pin 9 | MTPM — Power mode select (high = max sensitivity, low = low power) |
| Pin 10 | MTSA — Sensitivity adjustment select |
| Pin 11 | OUT0 — Digital output for channel 0 (active high) |
| Pin 12 | OUT1 — Digital output for channel 1 (active high) |
| Pin 13 | OUT2 — Digital output for channel 2 (active high) |
| Pin 14 | OUT3 — Digital output for channel 3 (active high) |
| Pin 15 | OUT4 — Digital output for channel 4 (active high) |
| Pin 16 | OUT5 — Digital output for channel 5 (active high) |
| Pin 17 | OUT6 — Digital output for channel 6 (active high) |
| Pin 18 | OUT7 — Digital output for channel 7 (active high) |
| Pin 19 | VDD — Positive supply (2.05 V to 3.6 V) |
| Pin 20 | GND — Ground reference |
Typische Anwendungen
MTCH108/SS ist geeignet für 6 Anwendungs: Consumer Appliance Control Panels, Industrial HMI Keypads, Automotive Interior Lighting and Seat Controls, IoT Smart-Home Touch Buttons, Replacement of Mechanical Switches in Sealed Enclosures, Audio/Video Equipment Front Panels.
Consumer Appliance Control Panels
The MTCH108-I/SS fits consumer appliance control panels because it provides 8 capacitive channels with hardware-only digital outputs and an integrated guard-ring driver that resists moisture and false triggers from wet fingers or splashed water. The 2.05 V to 3.6 V supply connects directly to a 3.3 V PIC or SAM MCU rail, simplifying the power tree in washing machines, dishwashers, and microwave ovens. The advanced on-die noise-suppression algorithm rejects interference from universal-motor brush noise and 50/60 Hz mains ripple, which are common in appliance environments. Designers save BOM cost by replacing 8 mechanical pushbuttons and their debounce RC networks with a single 20-pin SSOP IC and 8 sensor pads etched on the PCB.
Empfohlen
Industrial HMI Keypads
For industrial HMI keypads, the MTCH108-I/SS delivers 8 sealed capacitive buttons with no moving parts, eliminating ingress paths for dust and oil that would otherwise disable mechanical keypads. The -40C to +85C industrial temperature range covers most factory-floor environments, and the active-high outputs can drive optocouplers or low-side MOSFETs directly to switch 24 V industrial loads. The MTSA pin lets the engineer trade sensitivity for robustness, allowing fine adjustment to ignore thick operator gloves. Replacing 8 mechanical switches with one IC plus 8 copper pads reduces assembly time, eliminates tactile-switch wear-out failure modes, and gives a modern flat-panel aesthetic preferred in new HMI designs.
Empfohlen
Automotive Interior Lighting and Seat Controls
The MTCH108-I/SS works in non-safety automotive interior applications such as dome-light touch panels, seat-position memory buttons, and door-module mirror controls where 8 capacitive channels with simple digital outputs are sufficient. While the part is industrial-grade (not AEC-Q100), it is used in cabin environments that stay within -40C to +85C. The proximity-detection mode enables wake-on-approach lighting that illuminates the cabin as the driver's hand approaches, enhancing perceived quality. The on-die guard-ring driver rejects RF noise from the vehicle's CAN bus and infotainment system, which the datasheet documents as a key automotive-environment robustness feature.
Empfohlen
IoT Smart-Home Touch Buttons
The MTCH108-I/SS fits battery-powered IoT smart-home devices such as smart speakers, lighting dimmers, and security-panel keypads that need 8 capacitive buttons with low standby current and direct logic outputs. The MTPM power-mode pin can be toggled to put the device in low-power standby between user interactions, preserving battery life. The 3.6 V maximum supply matches a single Li-ion cell with headroom, eliminating the need for a separate regulator. The proximity (hover) mode enables wake-on-approach so a passing finger activates the device without requiring a mechanical press, which is ideal for sealed touch interfaces on outdoor smart locks and doorbells.
Empfohlen
Replacement of Mechanical Switches in Sealed Enclosures
The MTCH108-I/SS is a direct replacement for mechanical pushbuttons and toggle switches in sealed medical, outdoor, or food-service enclosures where crevices around mechanical switches collect contamination. Eight capacitive buttons on a flat panel are inherently sealed because the sensor pads live under a continuous overlay material - no holes, no gaskets, no moving parts. The IC's automatic self-calibration accommodates overlay thickness from 1 mm to 5 mm glass or acrylic, simplifying mechanical integration. Designers achieve IP65/IP67 ratings without redesigning the enclosure, and eliminate the dominant field-failure mode of mechanical-switch contact wear in high-cycle applications such as medical pump keypads or industrial scales.
Empfohlen
Audio/Video Equipment Front Panels
The MTCH108-I/SS works in audio/video equipment front panels where 8 capacitive buttons replace mechanical volume, source-select, transport, and preset keys for a modern, spill-proof industrial design. The hardware-only digital outputs connect directly to a 3.3 V MCU GPIO bank with no firmware touch-processing stack required, reducing BOM cost and time-to-market. The on-die advanced noise-suppression algorithm rejects interference from class-D amplifier switching edges and SMPS ripple that share the same chassis, which the datasheet identifies as a key robustness benefit. The MTPM pin allows low-power standby between user interactions, which is important for ENERGY STAR compliance on AV receivers and soundbars.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MTCH108/SS – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MTCH108T-I/SS | MTCH105-I/SS | MTCH102-I/MS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-20 | SSOP-20 - same | SSOP-20 - same | MSOP-10 - different (NOT drop-in) |
| Number of Channels | 8 | 8 (same) | 5 (-37.5%) | 2 (-75%) |
| 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) |
| Output Type | 8 active-high digital GPIO | 8 active-high digital GPIO (same) | 5 active-high digital GPIO | 2 active-high digital GPIO |
| Noise Suppression Algorithm | On-die advanced optimization | On-die advanced optimization (same) | On-die advanced optimization (same) | On-die advanced optimization (same) |
| Guard-Ring Driver | Integrated | Integrated (same) | Integrated (same) | Integrated (same) |
| Operating Temperature | -40C to +85C | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) |
Wichtigste Unterscheidungsmerkmale
- Pure hardware-only logic outputs with no MCU firmware overhead (vs. NXP MPR121)
- Same-family channel-count scalability on identical SSOP-20 footprint (vs. MTCH1060T-I/SS)
- Integrated advanced noise-suppression algorithm in pure analog domain (vs. Generic discrete touch ICs)
Designhinweise
Place a 100 nF X7R ceramic decoupling capacitor within 5 mm of the MTCH108 VDD pin (pin 19) and connect its ground lead directly to the GND pin (pin 20) with a short, wide trace. Route the 8 capacitive sensor traces (CH0-CH7) as short as possible - ideally under 50 mm - and keep them away from switching converter edges, clock lines, and high-current power traces. Each sensor pad should be a hatched or solid copper pour sized between 8 mm x 8 mm and 15 mm x 15 mm, with the ground-hatched spacing set per Microchip's PCB layout application note.
Use Microchip's recommended guard-ring pattern surrounding each sensor pad, tied to the MTCH108 internal guard-ring driver pin. The guard ring dramatically reduces moisture and water-droplet false triggers, which is essential for appliance and outdoor applications. Keep the sensor pads and guard ring on the top copper layer only - do not route any signal traces under the pads - and use a thin (1-2 mm) overlay material such as glass, acrylic, or polycarbonate for the user interface. Thicker overlays require recalibration via the MTSA pin setting.
Do not exceed 3.6 V on VDD - the MTCH108 absolute maximum is 4.0 V but operation above 3.6 V is not characterized and may damage the analog front-end. Do not leave the MTPM and MTSA pins floating - tie them high or low per the desired sensitivity/power mode, or noise pickup on these high-impedance pins will cause random false triggers. Do not place the IC on the same PCB region as a switching DC-DC converter without filtering, as the 2.05 V to 3.6 V analog supply is sensitive to common-mode ripple above 100 mVpp.
If the MTCH108 outputs must drive cables longer than 50 mm to a remote MCU, add a 100 ohm series resistor at each OUTx pin to dampen transmission-line ringing, and place a 10 kohm pull-up to VDD at the far end. The OUTx outputs are push-pull CMOS and source/sink several mA, so they can drive short PCB traces directly but should be buffered if connected to long cables or capacitive loads above 30 pF.
Compliance-Informationen
RoHS and REACH compliant per Microchip product page; industrial temperature grade (-40C to +85C) only - not AEC-Q100 qualified. For automotive applications requiring AEC-Q100, choose the MTCH108T-I/SS or contact Microchip for automotive-qualified variants.
