sensors

MAX31820

Full part number: MAX31820MCR+

Key datasheet specifications and the closest alternatives, ranked by parametric similarity and grounded in the manufacturer datasheet.

01 — Overview

This ADI datasheet covers the MAX31820 family of 1-Wire ambient temperature sensors, including TO-92 and surface-mount variants. The document defines electrical specifications for measuring temperatures from -55°C to +125°C with ±0.5°C accuracy between +10°C and +45°C. Key parameters include a supply voltage range of 3.0V to 3.7V (supporting parasite power), active current consumption up to 1.5mA, and user-selectable resolution from 9-bit to 12-bit. The sensor features a unique 64-bit serial code for multidrop capability, nonvolatile alarm settings, and operates without external components in a compact 3-pin package suitable for distributed HVAC or industrial monitoring systems.

02 — Key specifications

Datasheet parameters

Parameter	Min	Typ	Max	Conditions
quiescent current	—	1 mA	1.5 mA	VDD = 5V (Note 10)
supply voltage range	3 V	—	3.7 V	Local power (Note 2)
operating temperature	-55 °C	—	125 °C
standby current	—	750 nA	1 µA	(Notes 8, 9)

03 — Alternatives

Closest matches to MAX31820

DS18B20 1.2× higher supply voltage range, similar operating temperature, similar quiescent current

BME280 7.5× lower standby current, 1.9× lower supply voltage range, 1.4× lower operating temperature

BMP388 2.7× higher standby current, 1.9× lower supply voltage range, 1.4× lower operating temperature

LMT87 7.2× higher standby current, 1.4× higher operating temperature, 1.2× higher supply voltage range

LMT87DCKR 7.2× higher standby current, 1.4× higher operating temperature, 1.2× higher supply voltage range

SHT30-DIS 3.8× lower standby current, 1.2× higher operating temperature, similar supply voltage range

MCP9700 8.0× higher standby current, 1.2× higher operating temperature, 1.2× higher supply voltage range

LM50 2.2× higher supply voltage range, 1.2× higher operating temperature

04 — FAQ

Frequently asked questions

What is the maximum operating temperature for the MAX31820MCR+?

The maximum operating temperature is 125 °C.

What is the quiescent current of the MAX31820MCR+?

The quiescent current is 1 mA at VDD = 5V (Note 10).

What is the standby current?

The standby current is 750 nA (Notes 8, 9).

What is the supply voltage range for the MAX31820MCR+ under Local power (Note 2)?

The supply voltage range is 3.7 V.

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