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MCP9700A-E/TO

Analog temp sensor, +/-0.5C, 10mV/C, TO-92

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Manufacturer Part：

MCP9700A-E/TO

Package：

TO-92-3 (4.2 x 3.6 x 4.9 mm)

Description

Product Overview

The MCP9700A-E/TO from Microchip Technology is a low-power linear active thermistor analog temperature sensor with +/-0.5C accuracy in a TO-92-3 through-hole package. Output voltage is directly proportional to temperature with 10mV/C slope.

Key Specifications

Accuracy	+/-0.5 C (0 to +70C)
Output Slope	10 mV/C
Output at 0C	500 mV
Supply Voltage	2.3V to 5.5V
Supply Current	6 uA typical
Temperature Range	-40 to +125 C (E suffix)
Package	TO-92-3
Output Impedance	800 ohm
Start-Up Time	800 us max

Features

+/-0.5C accuracy over 0 to +70C range
Linear 10mV/C analog output simplifies ADC conversion
6uA ultra-low supply current for battery operation
No external components required – direct VDD and GND connection
TO-92 through-hole package for easy prototyping

Applications

Battery temperature monitoring
Environmental temperature sensing
Hard drive and PC board temperature monitoring
Industrial control temperature compensation
Consumer appliance temperature measurement

Product Introduction:MCP9700A-E/TO Product Introduction

The MCP9700A-E/TO from Microchip Technology is a low-power linear active thermistor integrated circuit that provides an analog output voltage directly proportional to temperature. The device features +/-0.5C accuracy over the 0 to +70C range with a linear 10mV/C output slope and 500mV output at 0C, simplifying ADC-based temperature measurement. The 6uA supply current enables battery-powered applications, and no external components are required. The E suffix denotes extended temperature range (-40 to +125C), and TO denotes TO-92 through-hole package. The A variant offers improved accuracy compared to the non-A MCP9700.

Working Principle:MCP9700A-E/TO Working Principle

The MCP9700A-E/TO operates as a linear analog temperature sensor. (1) The internal bandgap voltage reference and proportional-to-absolute-temperature (PTAT) circuit generate a voltage that is linearly proportional to temperature. The output voltage follows Vout = 500mV + 10mV x T, where T is temperature in Celsius. This linear relationship eliminates the need for lookup tables or complex calibration required by thermistors. (2) The 10mV/C output slope is designed to match the resolution of common ADCs: at 5V supply with a 10-bit ADC, each LSB represents approximately 0.5C (5V/1024 = 4.88mV per LSB). Oversampling or using a higher-resolution ADC improves measurement resolution. (3) The 6uA supply current is achieved through a CMOS design that biases the bandgap and PTAT circuits at minimal current. The 800us start-up time ensures the output is valid within one ADC conversion cycle after power-up.

Pin Description:MCP9700A-E/TO Pin Definition and Functions

Pin	Name	Function
1	VOUT	Analog voltage output (10mV/C)
2	GND	Ground
3	VDD	Power supply (2.3-5.5V)

Application Scenarios:In which products and applications isMCP9700A-E/TO used

Battery temperature monitoring with direct ADC connection and 6uA current
Environmental temperature sensing in HVAC systems
Hard drive and PC board temperature monitoring with simple analog interface
Industrial control temperature compensation for precision circuits
Consumer appliance temperature measurement with TO-92 easy mounting

Alternative Models:What chips are recommended as replacements for MCP9700A-E/TO

Model	Manufacturer	Key Difference
MCP9700AT-E/TT	Microchip	SOT-23-3, same function, smaller
MCP9701-E/TO	Microchip	19.5mV/C slope, wider output range
LM35DZ	TI	10mV/C, 0.5C accuracy, TO-92
TMP36GT9	ADI	10mV/C, 750mV at 25C, TO-92
LMT86DCKT	TI	SC-70, 10.9mV/C, lower current