LM35Analog temperature sensor
Temperature in. A voltage you can read out.
LM35 produces an analog voltage proportional to Celsius temperature. This page selects the LM35DZ in a three-lead TO-92 package. Its rated range is 0°C to 100°C; other family grades have different limits. Choose LM35DZ in TO-92 or LM35DM in SOIC-8. Both are LM35D grades; the SOIC package has five unused leads and different physical pin numbers.
Supply & groundTemperature outputNo connection
LM35DZTO-92Bottom view · flat edge below
LM35DMSOIC-8Top view · dot marks pin 1
Click a lead or use the arrow keys. Bottom view · flat edge below
PIN 1 · Supply & ground
Power+VS
Function
Positive supply input.
How to connect
Connect to a regulated 4–30 V supply. A 5 V rail suits the Arduino example.
PIN 2 · Temperature output
Analog outputVOUT
Function
Temperature output: 10 mV per °C.
How to connect
Connect to a high-impedance ADC input.
Electrical note
Negative-temperature operation needs the full-range circuit from the datasheet.
PIN 3 · Supply & ground
GroundGND
Function
Supply and measurement reference.
How to connect
Connect to the same ground as the ADC.
PIN 4 · No connection
Not connectedNC
Function
SOIC physical lead 2 has no internal connection.
How to connect
Leave this lead unconnected.
Electrical note
This lead does not exist on the three-lead TO-92 package.
PIN 5 · No connection
Not connectedNC
Function
SOIC physical lead 3 has no internal connection.
How to connect
Leave this lead unconnected.
Electrical note
This lead does not exist on the three-lead TO-92 package.
PIN 6 · No connection
Not connectedNC
Function
SOIC physical lead 5 has no internal connection.
How to connect
Leave this lead unconnected.
Electrical note
This lead does not exist on the three-lead TO-92 package.
PIN 7 · No connection
Not connectedNC
Function
SOIC physical lead 6 has no internal connection.
How to connect
Leave this lead unconnected.
Electrical note
This lead does not exist on the three-lead TO-92 package.
PIN 8 · No connection
Not connectedNC
Function
SOIC physical lead 7 has no internal connection.
How to connect
Leave this lead unconnected.
Electrical note
This lead does not exist on the three-lead TO-92 package.
At a glance
Analog temperature sensor
No serial protocol or register setup is needed. Measure VOUT relative to GND.
4–30 VSupply
10 mV/°COutput scale
0–100 °CLM35D range
3 pinsConnections
Operating profile
LM35DZ
Operating conditions
Key parameters and their test conditions
- Supply
- 4–30 VConditions / notes: Recommended operating supply
- LM35DZ temperature
- 0–100°CConditions / notes: LM35D grade; not the full LM35 family range
- Scale
- 10 mV/°CConditions / notes: Nominal linear conversion
- Accuracy at 25°C
- ±1.5°C maximumConditions / notes: LM35D; use the grade-specific table
Package details
Follows the selected physical package
- Manufacturer
- Texas Instruments
- Part number
- LM35DZ
- Package
- TO-92
- Connections
- 3 pins
- Mounting
- Through-hole
- Lead pitch
- See LP package drawing
- Package code
- LP
- Thermal reference
- See manufacturer thermal table
Connections by function
Select a pin to open its function, electrical notes and wiring guidance.
Supply & ground2 pins
Temperature output1 pins
Temperature output1 pins
No connection5 pins
Supply & ground2 pins
Power and bypass
Connect +VS to a regulated 5 V supply and GND to the common return. Place the illustrated 10 nF supply bypass close to the sensor.
Measure the output
Connect VOUT to a high-impedance ADC or voltmeter. At 25°C, expect about 250 mV. Keep wiring short; use TI’s isolation network for a heavy capacitive load.
Interpret the reading
Multiply volts by 100 to obtain °C. For a 10-bit ADC, use the reference voltage and 1024 quantization levels. The selected LM35D grade is specified from 0 to 100°C; the simple single-supply circuit has limitations near zero.
Temperature (°C) = measured output (V) × 100. ADC reference accuracy also affects the result.
Pin reference
Select a pin to explore its function and connection.
3 pins
| Pin | Signal | Type | Function |
|---|---|---|---|
| +VS | Power | Positive supply input. | |
| VOUT | Analog output | Temperature output: 10 mV per °C. | |
| GND | Ground | Supply and measurement reference. | |
| NC | Not connected | SOIC physical lead 2 has no internal connection. | |
| NC | Not connected | SOIC physical lead 3 has no internal connection. | |
| NC | Not connected | SOIC physical lead 5 has no internal connection. | |
| NC | Not connected | SOIC physical lead 6 has no internal connection. | |
| NC | Not connected | SOIC physical lead 7 has no internal connection. |
No pins match. Try a signal name or choose All pins.
Operating conditions
Reviewed manufacturer specifications
Manufacturer specifications 4 parameters
| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply | 4–30 V | Recommended operating supply |
| LM35DZ temperature | 0–100°C | LM35D grade; not the full LM35 family range |
| Scale | 10 mV/°C | Nominal linear conversion |
| Accuracy at 25°C | ±1.5°C maximum | LM35D; use the grade-specific table |
No specifications match. Try a parameter name or a unit.
Do not apply another LM35 grade’s accuracy or range to LM35DZ.
Voltage to temperature
Reviewed manufacturer specifications
Manufacturer specifications 4 parameters
| Temperature | VOUT | Interpretation |
|---|---|---|
| 0°C | 0 mV | Nominal equation; near-zero single-supply output has limits |
| 25°C | 250 mV | Nominal |
| 50°C | 500 mV | Nominal |
| 100°C | 1.000 V | Nominal |
No specifications match. Try a parameter name or a unit.
ADC conversion
Reviewed manufacturer specifications
Manufacturer specifications 3 parameters
| Parameter | Value | Conditions / notes |
|---|---|---|
| Formula | T = ADC × VREF / (2^N − 1) × 100 | Endpoint-scaled ideal ADC estimate |
| 10-bit / 5 V | ≈0.489°C per count | Calculated resolution; not sensor accuracy |
| Reference | Use measured VREF | Supply variation creates conversion error |
No specifications match. Try a parameter name or a unit.
Arduino LCD thermometer
Use the linked example to inspect the sensor output and the firmware’s temperature conversion.
Manufacturer application guideTemperature monitoring
Measure ambient or surface temperature within the selected grade’s range. Choose mounting and response time for the measurement.
Manufacturer application guideTake it into ProTech
Find LM35 in the Components Library to place its schematic symbol and connect its pins.
Simulation model available · Open the working exampleOpen ProTech