QT100-ISG Equivalent & Substitute Parts

Part Overview

The QT100-ISG is a capacitive touch sensor IC manufactured by Microchip Technology, designed for single-channel proximity detection applications. It operates within a 2V to 5.5V supply range and delivers 14-bit resolution in a compact SOT-23-6 surface mount package. The device is classified as obsolete, making identification of compatible substitute components essential for ongoing design support and production continuity.

Substiute Parts

QT100-ISG

Microchip TechnologyIn Stock: 22388QT100-ISG Datasheet

Current PartRFQ

AT42QT1010-TSHR

Microchip TechnologyIn Stock: 12370AT42QT1010-TSHR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the QT100-ISG is determined by strict alignment of the following electrical and mechanical parameters:

• Package compatibility: SOT-23-6 surface mount package required for PCB layout compatibility
• Functional equivalence: Single-channel capacitive touch input with 14-bit resolution
• Supply voltage range: Must accommodate the original 2V to 5.5V specification or provide a compatible subset
• Operating temperature range: Must support -40°C to 85°C industrial operating conditions
• Series alignment: QTouch™ series devices from Microchip Technology
• Compliance standards: ROHS3 compliance and MSL 1 rating maintained

The AT42QT1010-TSHR meets all substitution criteria as an active product within the same QTouch™ series, maintaining functional and mechanical compatibility while offering improved supply current efficiency.

Parameter Comparison

Engineering Selection Recommendations

The AT42QT1010-TSHR is the qualified substitute for the obsolete QT100-ISG. Both devices maintain identical package geometry, pin configuration, and functional specifications for single-channel capacitive touch sensing. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The AT42QT1010-TSHR operates across a marginally lower minimum supply voltage (1.8V versus 2V) and demonstrates reduced supply current consumption (378.5µA versus 600µA), both favorable characteristics for power-constrained applications. All regulatory compliance certifications—ROHS3, MSL 1, and REACH unaffected status—are maintained between the original and substitute devices.

Selection of the AT42QT1010-TSHR eliminates obsolescence risk while preserving electrical and mechanical compatibility with existing PCB designs and firmware implementations.

Frequently Asked Questions (FAQ)

Q: Can the AT42QT1010-TSHR be used as a direct replacement for the QT100-ISG?

A: Yes. Both devices share identical SOT-23-6 package geometry, pin assignments, single-channel input configuration, 14-bit resolution, and operating temperature range. The substitute part is electrically compatible across all specified parameters.

Q: What is the primary advantage of substituting to the AT42QT1010-TSHR?

A: The AT42QT1010-TSHR is an active product with guaranteed long-term availability, whereas the QT100-ISG is obsolete. Additionally, the substitute offers reduced supply current (378.5µA versus 600µA), providing improved power efficiency in battery-powered or energy-constrained designs.

Q: Are there any supply voltage considerations when switching to the AT42QT1010-TSHR?

A: The AT42QT1010-TSHR operates from 1.8V to 5.5V, compared to the QT100-ISG range of 2V to 5.5V. This represents a compatible extension of the lower voltage boundary. Designs operating above 2V experience no voltage-related constraints.

Q: Do both parts maintain the same compliance certifications?

A: Yes. Both the QT100-ISG and AT42QT1010-TSHR are ROHS3 compliant, carry MSL 1 (unlimited) moisture sensitivity ratings, and are REACH unaffected. Regulatory compliance is maintained across the substitution.

Q: Is PCB layout modification required when substituting the AT42QT1010-TSHR?

A: No. Identical SOT-23-6 package specifications and pin configurations eliminate the need for PCB redesign. The substitute part is a direct footprint match.