LM50 Industry-Standard, Analog Centigrade (10mV/°C) Temperature Sensor in SOT-23

Package

1 Features

• Industry-Standard Sensor Gain/Offset:

– 10mV/°C, 500mV at 0°C

• LM50B Temperature Accuracy:

– ±2°C (Max) at 25°C

– ±3°C (Max) over temperature range

• LM50C Temperature Accuracy:

– ±3°C (Max) at 25°C

– ±4°C (Max) over temperature range

• Operating supply range: 4.5V to 10V

• Quiescent Current (Typ): 95μA

• Available in Standard SOT23-3 package

• Nonlinearity: ±0.8°C (Max)

• DC Output Impedance: 2kΩ/4kΩ (typ/Max)

– Enables driving large capacitive loads

• UL Recognized Component

2 Applications

• Mobile phones, PC & notebooks

• Data storage

• Battery Management

• Home and Multifunction printers

• Medical and healthcare Instruments

• HVAC System

• Power Supply Modules

3 Description

The LM50 device is a precision analog temperature

sensor that can measure temperatures from -40°C

to 125°C using a single positive supply. The output

voltage of the device is linearly proportional to

temperature (10mV/°C) and has a DC offset of

500mV at 0°C. The offset allows reading negative

temperatures without the need for a negative supply.

The output voltage of the LM50 ranges from 100mV

(at –40°C) to 1.75V (at 125°C), simplifying analog-to-

digital converter (ADC) interfacing.

Unlike NTC thermistors, LM50 does not require any

external calibration, trimming or software linearization

leading to simplifying the circuitry requirements in

a single supply environment. Due to low quiescent

current of LM50 (typically around 95µA), self-heating

is limited to a very low 0.2°C (in still air) and the

device is designed for remote or battery-powered

applications. Trimming and calibration of the LM50 at

the wafer level provide long-term availability, low cost

and consistent accuracy in two grades: LM50B (±2°C

at 25°C, ±3°C over temperature range) and LM50C

(±3°C at 25°C, ±4°C over temperature range).

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

LM50

DBZ (SOT-23, 3)

2.37mm × 2.92mm

(1)

For more information, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

GND

VO

+VS

Thermal Diodes

2k

+

–

MSPM0

MCU

ADC

CLoad

GND

VCC

VCC

CBypass

LM50

LM50-Q1

Simplified Schematic

DUT Te mperature (C)

-50

-25

0

25

50

75

100

125

150

0

0.25

0.5

0.75

1

1.25

1.5

1.75

2

1.75

0.75

0.1

VO = (+10 mV/°C × T °C) + 500 mV

Full-Range Centigrade Temperature Sensor (–40°C

to 125°C)

LM50

SNIS118H – JULY 1999 – REVISED MAY 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.