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.