sensors

MAX31820

Full part number: MAX31820MCR+

Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the MAX31820 does

The MAX31820 is a 1-Wire ambient temperature sensor offering 9-bit to 12-bit Celsius measurements with ±0.5°C accuracy from +10°C to +45°C and ±2.0°C across its full -55°C to +125°C operating range. It features a 3.0V to 3.7V supply voltage, 750ms maximum conversion time for 12-bit resolution, and 1000nA standby current. This device derives power directly from the data line, eliminating external power requirements. It includes a unique 64-bit serial code for multidrop capability and user-definable nonvolatile alarm settings. Engineers typically use it in HVAC controls, industrial monitoring systems, and any application requiring precise ambient temperature sensing in a compact 3-pin TO-92 package.

Next step
Start building with MAX31820 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
01 — Key specifications

Datasheet parameters

Datasheet parameters for MAX31820
ParameterMinTypMaxConditionsSource
supply voltage range 3 V — 3.7 V Local power (Note 2); DC Electrical Characteristics ADI datasheet, p. 2 — DC Electrical Characteristics
operating temperature -55 °C — 125 °C ADI datasheet, p. 20 — Ordering Information
standby current — 750 nA 1 µA (Notes 8, 9); DC Electrical Characteristics ADI datasheet, p. 2 — DC Electrical Characteristics
sample rate — 1.33 Hz — 12-bit resolution, tCONV = 750 ms ADI datasheet, p. 3 — AC Electrical Characteristics
02 — Alternatives

Closest matches to MAX31820

DS18B20 1.9× higher sample rate, 1.2× higher supply voltage range, similar operating temperature
MAX31820 similar operating temperature, similar quiescent current, similar sample rate
ICM-42607-C 1.9× lower supply voltage range, 1.8× lower quiescent current, 1.6× lower operating temperature
MAX31865 2.0× higher quiescent current, 1.2× higher operating temperature, similar supply voltage range
TMP112 3.0× higher sample rate, 1.5× lower standby current, 1.3× lower supply voltage range
TMP36 1.9× lower supply voltage range, 1.5× lower standby current, 1.2× higher operating temperature
BME280 3.8× lower standby current, 1.9× lower supply voltage range, 1.4× lower operating temperature
TMP102 5.0× lower standby current, 3.0× higher sample rate, 1.2× higher operating temperature
03 — FAQ

Frequently asked questions

What is the maximum operating temperature for the MAX31820MCR+?

The maximum operating temperature is 125 °C.

What is the sample rate at 12-bit resolution with tCONV = 750 ms?

The sample rate is 1.33 Hz.

What is the standby current of the MAX31820MCR+?

The standby current is 750 nA (Notes 8, 9); DC Electrical Characteristics.

What is the supply voltage range under Local power (Note 2) conditions?

The supply voltage range is 3.7 V.

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