# LM35 temperature sensor: 10 mV/°C, 4 to 30 V, −55 to 150 °C

> The classic analog Celsius temperature sensor: output scale, supply range, accuracy at 25 °C, self-heating and packages.

Canonical: https://roboticsengineering.in/components/lm35-analog-temperature-sensor/ | Published: 2026-11-03 | Updated: 2026-11-03

**The LM35 is an analog temperature sensor calibrated directly in degrees Celsius, with a linear output of +10 mV/°C, 0.5 °C ensured accuracy at 25 °C and a 4 V to 30 V supply.** You read it with an ADC and need no calibration. It is the older, higher-voltage alternative to the [TMP235](https://roboticsengineering.in/components/tmp235-analog-temperature-sensor/). Figures are from the Texas Instruments LM35 datasheet SNIS159H.

## Key specifications

| Output | +10 mV/°C |
| --- | --- |
| Accuracy | 0.5 °C ensured at 25 °C |
| Range | −55 to 150 °C (LM35) |
| Supply | 4–30 V |
| Current | under 60 µA |
| Self-heating | 0.08 °C in still air |
| Output impedance | 0.1 Ω at 1 mA |

## What the datasheet promises

| Item | Datasheet value |
| --- | --- |
| Scale factor | Linear +10 mV/°C, calibrated directly in Celsius |
| Accuracy | 0.5 °C ensured at 25 °C |
| Temperature range | LM35: −55 to 150 °C; LM35C: −40 to 110 °C |
| Supply voltage | 4 V to 30 V |
| Supply current | Less than 60 µA |
| Self-heating | 0.08 °C in still air |
| Output impedance | 0.1 Ω for a 1 mA load |
| Packages | TO-CAN, TO-92, SOIC-8 and TO-220, depending on the variant |

Because the supply is at least 4 V, it will not run from a 3.3 V rail; for that use a part with a lower supply such as the TMP235. With a 5 V ADC, the output at 25 °C is 250 mV, and as a calculation 10 mV per degree means a 10-bit ADC at 5 V resolves about 0.5 °C per step.

## Using it on a robot

- Measure motor, battery or enclosure temperature with one ADC pin.
- Run a long cable to a remote sensor, which the datasheet lists as a suitable use, keeping the lead away from motor wiring.
- Check the full-range circuit in the datasheet if you need to read below 2 °C.

## Sources and further reading

- [Texas Instruments LM35 datasheet (SNIS159H)](https://www.ti.com/lit/ds/symlink/lm35.pdf) — scale factor, accuracy, range, supply, current, self-heating and packages above.

Last reviewed: November 2026. Limits are from the Texas Instruments datasheet; breakout boards and modules vary. No price is quoted because it has not been checked.