QT150-ASG Microchip Integrated Circuit (Small Outline Packages) In Stock
The QT150-ASG is a Microchip single-channel capacitive touch sensor IC using charge-transfer (QT) technology to detect finger proximity through non-conductive overlays up to 5 mm thick. It operates from 2.0 V to 5.5 V supply with a direct logic output and requires no microcontroller for standalone touch detection.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- QT150-ASG Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Single-channel capacitive touch detection with charge-transfer QT technology for reliable finger sensing
- Detects touch through non-conductive overlays up to 5 mm thick including glass, plastic, and wood
- Wide 2.0 V to 5.5 V supply range for direct compatibility with 3.3 V and 5 V systems
- Standalone operation with active-high direct output requires no firmware or external MCU
Applications
The QT150-ASG is suited for touch-activated switches in consumer appliances, industrial control panels, and IoT device interfaces where mechanical buttons must be replaced with sealed capacitive surfaces for improved reliability and ingress protection up to IP67. It is commonly used in white goods front panels, access control keypads, and backlighted touch buttons in automotive interior trim where a simple single-touch activation signal is required without dedicated touch-controller firmware.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What overlay thickness can QT150-ASG sense through and what materials are compatible?
The QT150-ASG can detect a finger through non-conductive overlays up to 5 mm thick, including glass, plastic, ceramic, and wood panels. This makes it suitable for sealed front-panel designs where the touch surface must be waterproof and rated to IP67, with no exposed electrical contacts that could corrode or wear out over time.
Does QT150-ASG require a microcontroller or external firmware to operate?
No, the QT150-ASG operates standalone with an internal sensitivity calibration algorithm. It produces an active-high logic output on detection without requiring any microcontroller, I2C, or SPI communication. It auto-calibrates on power-up and recalibrates every 8 seconds, making the entire touch function self-contained from a 2.0 V to 5.5 V supply.
What supply voltage range and current consumption does QT150-ASG require?
The QT150-ASG operates from 2.0 V to 5.5 V, covering both 3.3 V and 5 V logic domains. Supply current is approximately 150 µA in normal sampling mode, dropping to under 5 µA in low-power sleep mode between bursts, making it suitable for coin-cell or energy-harvesting powered touch buttons in battery-operated IoT devices.
How does QT150-ASG compare to a resistive touch switch for a sealed industrial panel?
A resistive switch requires a physical hole in the panel for button actuation, making hermetic sealing difficult and introducing a mechanical wear point with a typical lifecycle of 100,000 actuations. QT150-ASG eliminates the panel opening entirely, achieving IP67 ingress protection over a sensing area of approximately 10 mm x 10 mm, and has no mechanical parts to wear out, providing virtually unlimited cycle life for industrial panel applications.
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