1 Features

1• Directly Calibrated to the Kelvin Temperature

Scale

• 1°C Initial Accuracy Available

• Operates from 400 μA to 5 mA

• Less than 1-Ω Dynamic Impedance

• Easily Calibrated

• Wide Operating Temperature Range

• 200°C Overrange

• Low Cost

2 Applications

• Power Supplies

• Battery Management

• HVAC

• Appliances

3 Description

The LM135 series are precision, easily-calibrated,

integrated circuit temperature sensors. Operating as

a 2-terminal zener, the LM135 has a breakdown

voltage directly proportional to absolute temperature

at 10 mV/°K. With less than 1-Ω dynamic impedance,

the device operates over a current range of 400 μA to

5 mA with virtually no change in performance. When calibrated at 25°C, the LM135 has typically less than

1°C error over a 100°C temperature range. Unlike

other sensors, the LM135 has a linear output.

Applications for the LM135 include almost any type of

temperature sensing over a −55°C to 150°C

temperature range. The low impedance and linear

output make interfacing to readout or control circuitry are especially easy.

The LM135 operates over a −55°C to 150°C temperature range while the LM235 operates over a

−40°C to 125°C temperature range. The LM335

operates from −40°C to 100°C. The LMx35 devices

are available packaged in hermetic TO transistor

packages while the LM335 is also available in plastic

TO-92 packages.