1 Features

• AEC-Q100 Qualified for automotive applications

– LM50-Q1 (Grade-1): –40°C to +125°C

operating temperature

– Device HBM ESD classification level 2

• Functional safety-capable

– Documentation available to aid functional safety

system design

• Industry-Standard Sensor Gain/Offset:

– 10mV/°C, 500mV at 0°C

• LM50-Q1 Temperature Accuracy:

– ±3°C (Max) at 25°C

– ±4°C (Max) over −40°C to 125°C

• 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

• Automotive

• HEV/EV OBC & DC/DC converter

• Electronic power steering (EPS)

• Head unit & digital cockpit

• Braking systems

• In-cabin sensing

• HVAC System

• Power Supply Modules

3 Description

The LM50-Q1 device is an automotive-grade analog

temperature sensor (AEC-Q100 Grade 1 qualified)

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-Q1 ranges from 100mV (at –40°C) to 1.75V

(at 125°C), simplifying automotive ADC interfacing

(including ADC integrated in MCU).

Unlike NTC thermistors, LM50-Q1 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-Q1 (typically around

95μA), self-heating is limited to a very low 0.2°C

(in still air) and the device is ideal for automotive

applications such as ECUs. Trimming and calibration

of LM50-Q1 at the wafer level verify low cost and

consistent accuracy: (±3°C at 25°C, ±4°C across

–40°C to 125°C). Functional safety documentation

is also available for systems requiring enhanced

reliability.