MCP9700T-E/TT: A Low-Power Linear Active Thermistor IC for Precision Temperature Sensing

In the realm of electronic design, accurately and efficiently measuring temperature is a fundamental requirement across countless applications, from consumer devices to industrial systems. The MCP9700T-E/TT from Microchip Technology stands out as a premier solution, offering a compelling combination of low-power operation, linear voltage output, and a small form factor. This linear active thermistor IC simplifies the design process, providing a highly integrated alternative to traditional negative temperature coefficient (NTC) thermistors.

The core advantage of the MCP9700T-E/TT lies in its linear active thermistor architecture. Unlike NTC thermistors, which produce a non-linear resistance change requiring complex signal conditioning and lookup tables, this device delivers a voltage output that is directly proportional to the ambient temperature. With a typical scale factor of 10.0 mV/°C and a DC accuracy of ±2°C (max.) from 0°C to +70°C, it provides a straightforward and reliable signal that can be easily digitized by any microcontroller's analog-to-digital converter (ADC), drastically reducing firmware overhead and calibration needs.

A key feature that makes the MCP9700T-E/TT ideal for portable and battery-powered applications is its exceptionally low operating current. Consuming just 6 µA (typical) during operation, it imposes a minimal drain on the power source, significantly extending battery life in devices such as environmental monitors, wearable technology, and wireless sensor nodes. Its wide operating voltage range of 2.3V to 5.5V further enhances its versatility, allowing it to be powered directly from a single-cell lithium battery or a regulated microcontroller supply.

Housed in a space-saving SOT-23-3 package, the IC is designed for applications where board real estate is at a premium. Its simple three-wire interface (VDD, VOUT, and GND) ensures easy integration into existing designs. Furthermore, the device is designed to be robust, with built-in resistance to electromagnetic interference (EMI) on its output, which is a common challenge when using high-impedance sensor outputs in noisy environments.

ICGOOODFIND: The MCP9700T-E/TT is an exceptional choice for designers seeking a hassle-free, accurate, and power-efficient temperature sensing solution. Its linear voltage output eliminates computational complexity, while its ultra-low quiescent current makes it a perfect fit for the expanding universe of portable and always-on devices. For projects demanding reliability, simplicity, and performance, this linear active thermistor IC represents a superior design decision.

Keywords: Temperature Sensor, Low-Power, Linear Active Thermistor, Analog Output, SOT-23