AT42QT1012-MAHR - 1-Key QTouch Touch Sensor IC | Microchip
Teilenummer: AT42QT1012-MAHR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.42 | $1,42 |
| 10 | $1.28 | $12,80 |
| 100 | $1.05 | $105,00 |
| 500 | $0.92 | $460,00 |
| 1.000 | $0.81 | $810,00 |
| 3.000 | $0.71 | $2.130,00 |
AT42QT1012-MAHR Übersicht
What is a capacitive touch sensor IC? A capacitive touch sensor IC is a mixed-signal device that detects changes in capacitance caused by a finger approaching or touching an electrode. These devices sit in the sensor signal chain between the user-facing touch pad and a host microcontroller, translating pico-farad-level capacitance shifts into clean digital edges or level outputs. The hierarchy is: capacitive touch sensor -> touch controller IC -> human-machine interface (HMI) -> embedded system. Microchip's QTouch® family is among the longest-established capacitive-touch IP portfolios on the market.
Key features of the AT42QT1012-MAHR include a maximum key count of 1, support for solid or ring electrode shapes, a minimum electrode size of 6 mm × 6 mm (panel-thickness dependent), single-layer PCB compatibility, advanced filtering algorithms for noisy environments, sensitivity adjustment via external Cs capacitor, and a programmable auto switch-off capability for the touch-on/touch-off toggle output. The 8-UDFN EP package reduces PCB footprint while the exposed pad provides thermal and electrical grounding.
Architecturally the part combines a charge-transfer sensing frontend, a digital signal-processing block running Microchip's patented adjacent-key suppression / drift-compensation algorithms, and an output stage that supports both touch-on/touch-off toggle mode and direct level signalling. The on-chip power management provides low-power standby and fast wake on touch, making it suitable for battery-powered appliances.
Typical applications include appliance front panels, IoT touch buttons replacing mechanical switches, proximity-activated wake circuits, LED-dimmable light controls, door-lock keypads, and consumer-electronics user interfaces. The single-key / single-IC simplicity makes it ideal when BOM and PCB area matter more than multi-key scanning.
Designers should note that the Cs sample capacitor value directly sets sensitivity; smaller values raise gain and noise sensitivity, larger values lower gain and improve EMC robustness. A 47 nF NP0 ceramic on the Cs pin is a typical starting value per the Microchip datasheet.
This page synthesizes distributor pricing, drop-in same-package alternatives, and design guidance beyond the manufacturer datasheet to accelerate component selection.
Drop-in-Alternativen für AT42QT1012-MAHR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
AT42QT1010-MAHR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
AT42QT1011-MAHR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
AT42QT1012-MAH
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AT42QT1010-TSHR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AT42QT1012-MAHR Grenzwerte & elektrische Eigenschaften
| Number of Keys | 1 (configurable as single key or proximity sensor) |
| Technology | QTouch® capacitive charge-transfer |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Minimum Key Size | 6 mm x 6 mm (panel-thickness dependent) |
| Electrode Design | Solid or ring |
| PCB Layers Required | 1 |
| Ausgangstyp | Push-pull / open-drain (touch on/off toggle with auto switch-off) |
| Sensitivity Adjustment | External Cs capacitor |
| Gehäuse | 8-UDFN EP (MAH), 3 mm x 3 mm |
| Betriebstemperatur | -40 C to +85 C |
| Montageart | Surface Mount |
| MSL-Level | 1 |
| RoHS-Status | Compliant |
AT42QT1012-MAHR Pin-Konfiguration
| Pin 1 | SNS — Sense electrode connection (touch pad) |
| Pin 2 | Cs — Sample capacitor for charge-transfer acquisition |
| Pin 3 | VDD — Positive supply (1.8 V to 5.5 V) |
| Pin 4 | OUT — Toggle / momentary output (push-pull or open-drain) |
| Pin 5 | GND — Ground |
| Pin 6 | MODE — Toggle / momentary mode select |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
Typische Anwendungen
AT42QT1012-MAHR ist geeignet für 6 Anwendungs: Appliance Touch Control Panels, IoT Battery-Powered Wake Buttons, Proximity-Activated Lighting, Consumer Electronics Touch Keys, Door Lock Touch Keypads, Industrial Touch-Replacement Switches.
Appliance Touch Control Panels
The AT42QT1012-MAHR is well suited to single-button appliance control panels such as range-hood fans, microwave start keys, or coffee-machine brew toggles. Its 1.8 V-5.5 V supply directly supports 3.3 V MCU rails and 5 V legacy logic. The touch-on/touch-off toggle with programmable auto switch-off (per Microchip datasheet 40001948A) means a single press-and-walk-away use model without host-side timing, and QTouch® charge-transfer acquisition rejects the 50/60 Hz mains and motor noise typical in white goods. Replace a mechanical switch with the AT42QT1012-MAHR behind a 3 mm acrylic overlay to gain sealed, easy-to-clean HMI.
Empfohlen
IoT Battery-Powered Wake Buttons
The AT42QT1012-MAHR's low standby current and 1.8 V minimum supply enable coin-cell-powered wake buttons for IoT endpoints. Tie its OUT pin to a host MCU wake interrupt so the MCU can remain in deep sleep until a user touches the electrode, extending battery life from weeks to months. The 6 mm x 6 mm minimum electrode at single-layer PCB (per Microchip datasheet) keeps the bill of materials to one IC, one Cs cap, and one bypass cap. Ideal for doorbell buttons, BLE-pairing touch pads, and remote-control wake surfaces.
Empfohlen
Proximity-Activated Lighting
Configure the AT42QT1012-MAHR in proximity mode and mount behind a 5-10 mm non-metallic panel to detect a hand approaching without physical contact. This delivers hygienic, sealed lighting controls for medical, kitchen, and bathroom fixtures. According to the Microchip datasheet, sensitivity scales with the Cs sample capacitor value and electrode area, so larger copper pours extend detection range to 50 mm or more. The toggle output with auto switch-off (per datasheet 40001948A) also suits occupancy-style controls where lights must time out automatically.
Empfohlen
Consumer Electronics Touch Keys
The AT42QT1012-MAHR replaces a mechanical push-button in headphones, remote controls, smart speakers, and wearable devices. The 8-UDFN 3 mm x 3 mm package (per Microchip datasheet 40001948A) fits behind a 6 mm electrode on a flexible PCB, and the single-layer PCB requirement simplifies stack-up in cost-sensitive consumer designs. The OUT pin can directly drive a status LED, eliminating one transistor and reducing BOM cost. Pair with a low-power MCU such as PIC18F27K40 for a complete touch-key subsystem.
Empfohlen
Door Lock Touch Keypads
Single-door electronic locks can use one AT42QT1012-MAHR per key position with a small PCB array. The QTouch® acquisition method (per Microchip datasheet) tolerates the ESD, moisture, and mechanical-vibration stresses typical at door installations, and the auto switch-off prevents a latched-out lock if a user leaves a finger on the sensor. Operate from 4xAA cells via the wide 1.8 V-5.5 V supply for multi-year battery life, and pair with a secure host MCU such as the PIC32MX340F512H for authentication.
Empfohlen
Industrial Touch-Replacement Switches
Industrial HMI panels benefit from the AT42QT1012-MAHR's sealed touch interface where mechanical buttons fail under dust, oil, or chemical washdown. The -40 C to +85 C operating range covers most factory environments, and the QTouch® adjacent-key suppression / drift-compensation algorithm (per Microchip datasheet 40001948A) prevents false triggers from EMI emitted by variable-frequency drives. Mount behind a 3 mm polycarbonate overlay to deliver IP65-equivalent ingress protection at lower cost than sealed mechanical switches.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für AT42QT1012-MAHR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | AT42QT1010-MAHR | AT42QT1011-MAHR | AT42QT1012-MAH | AT42QT1010-TSHR | TTP223-BA6 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | TonTouch |
| Package | 8-UDFN EP (MAH) 3x3 mm | 8-UDFN EP (MAH) 3x3 mm - same | 8-UDFN EP (MAH) 3x3 mm - same | 8-UDFN EP (MAH) 3x3 mm - same | 8-UDFN EP (MAH) 3x3 mm - same | SOT-23-6 - DIFFERENT |
| Number of Keys | 1 | 1 | 1 (proximity optimised) | 1 | 1 | 1 |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.0 V to 5.5 V |
| Auto Switch-off | Yes (programmable) | No | No (proximity mode) | Yes (programmable) | No | No |
| Output Stage | Push-pull / open-drain toggle | Push-pull toggle | Push-pull proximity output | Push-pull / open-drain toggle | Push-pull toggle | Active-low open-drain |
| Sensitivity Adjustment | External Cs capacitor | External Cs capacitor | External Cs capacitor | External Cs capacitor | External Cs capacitor | External Cs capacitor |
Wichtigste Unterscheidungsmerkmale
- Integrated programmable auto switch-off timer on touch-on/touch-off output (vs. AT42QT1010-MAHR)
- QTouch® charge-transfer algorithm with on-chip drift compensation (vs. TTP223-BA6)
- Single-layer PCB compatibility with 6 mm x 6 mm minimum electrode (vs. AT42QT1011-MAHR)
Designhinweise
Per Microchip datasheet 40001948A, keep the SNS trace short and narrow (typically 0.2-0.5 mm) and route it away from noisy digital lines, switching converters, and AC mains traces. A ground ring or hatched guard plane around the electrode reduces sensitivity to external noise and to moisture films that mimic a touch. Place the Cs sample capacitor as close to the IC Cs pin as possible to minimise parasitic capacitance and maintain Cs-derived sensitivity.
Do not place a series resistor on the SNS line; the QTouch® charge-transfer acquisition relies on a clean RC path to Cs. Use an NP0/C0G ceramic for Cs to avoid the voltage coefficient of X7R which can change sensitivity by 10-20% over the supply range. If the touch fails on a humid day, first try a larger Cs value before adding a ground guard - the auto-calibration may simply need a wider acquisition window.
Estimated: at 3.3 V supply the AT42QT1012-MAHR draws roughly 1-2 mA active and sub-microamp standby per Microchip typical characteristics, but the absolute numbers should be confirmed against the datasheet DC characteristics table. Add a 100 nF ceramic bypass within 5 mm of VDD and a 1-10 uF bulk cap if the supply is shared with digital loads. For battery operation, gate the host MCU's regulator with the AT42QT1012-MAHR OUT pin to drop system quiescent current by orders of magnitude.
Compliance-Informationen
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - not recommended for automotive safety-critical applications. Halogen-free per Microchip environmental certification.
