Part Number: LM35CAZ/NOPB

Manufacturer: Texas Instruments

Description: SENSOR ANALOG -40C-110C TO92-3

Shipped from: Shenzhen/HK Warehouse

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Description of the LM35CAZ/NOPB

The LM35 series of devices is suited for use as precise temperature indicators since the voltage they produce is directly proportional to the temperature in Centigrade. The LM35 is an ideal linear temperature sensor since it can directly convert to Centigrade without requiring a huge constant voltage to be subtracted from the output. No extra calibration or trimming is required for the LM35 device’s complete temperature range of 55°C to 150°C with typical accuracy of 1/4°C at ambient temperature. Wafer-level trimming and calibration ensures the lowest possible prices.

Because of its low output impedance, a linear output, and accurate intrinsic calibration, the LM35 device is particularly well-suited for use as an interface with readout or control circuitry. The gadget can be powered either by a single supply or a pair of stores (plus and minus). Self-heating of the LM35 device is less than 0.1°C in still air, thanks to its low supply current of 60 A. The LM35 device can function between 55 degrees Celsius and 150 degrees Celsius, whereas the LM35C device can function between 40 degrees Celsius and 110 degrees Celsius (with enhanced accuracy of 10 degrees Celsius). The LM35C, LM35CA, and LM35D are all offered in the plastic TO-92 transistor packaging, but the rest of the LM35 series are only available in hermetic TO transistor packages. There are two housing options for the LM35D, a plastic TO-220 package, and an 8-lead surface-mount small-outline package.

Features for the LM35CAZ/NOPB

  • Using Only the Celcius Temperature for Calibration (Centigrade).
  • Scale Factor (10 mV/°C) Added to Linear.
  • Precision (at 25 degrees Celsius) within 0.5°C.
  • Valid from a Freezing 55°C to a Sweltering 150°C.
  • Optimal for Use in Distant Settings.
  • Trimming at the wafer level keeps costs down.
  • Input Voltage: 4 V – 30 V, DC.
  • Current Drainage Less Than 60
  • Self-heating performance is low, reaching only 0.08 degrees Celsius in a still-air environment.
  • There is often only a 14-degree non-linearity.
  • It has a low-impedance output of 0.1 at 1 mA load.
  • Applications
  • Power Supplies
  • Battery Management
  • HVAC
  • Appliances

Detailed Description

The output voltage of the fine integrated-circuit temperature sensors in the LM35 series is linearly proportionate to the temperature measured in Centigrade. Compared to linear temperature sensors calibrated in Kelvin, to obtain Centigrade scaling with the LM35 device, the user need not subtract a constant high voltage from the output. Typical accuracy values for the LM35 device are 14 °C at room temperature and 34 °C across the whole temperature range of 55 °C to 150 °C without the need for any extra calibration or trimming. A lower cost can be guaranteed by performing trimming and calibration at the wafer level.

Because of its low output impedance, a linear output, and exact intrinsic calibration, the LM35 device makes it particularly simple to interface with reading or control circuitry. The gadget can either be utilized with a single power supply or separate supplies for plus and minus. The LM35 gadget has very low self-heating, measuring less than 0.1 degrees Celsius in still air because it takes only 60 microamperes from the supply. The LM35 device is rated to work across a temperature range of -55 degrees Celsius to 150 degrees Celsius. In contrast, the LM35C device is placed for a temperature range of -40 degrees Celsius to 110 degrees Celsius (with enhanced accuracy of 10 degrees). A delta-V BE architecture may be found within the temperature-sensing element of the device.

Application Information

Due to its advantages, the LM35 can be used in various temperature-sensing scenarios. The availability of different bundles boosts adaptability.


● Layout Guidelines

Like other integrated-circuit temperature sensors, the LM35 can be used with little effort. The temperature should be within 0.01°C of the surface temperature after the device has been glued or cemented. The 0.01°C similarity assumes the exact temperature of the surrounding air as the surface. Especially for the TO-92 plastic container, the actual temperature of the LM35 die would be somewhere between the surface temperature and the air temperature if the air temperature were much higher or lower than the surface temperature.

Since the TO-92 package’s copper leads are the main thermal conduit for transporting heat into the device, the internal temperature of the component may be lower than the ambient temperature. Keep the LM35 device’s output wiring at the same temperature as the surface of interest to reduce the impact of this issue. A simple bead of glue will do the trick for hiding these cables. The LM35 die won’t be impacted by ambient air temperature, and the epoxy bead will keep the leads and wires at the same temperature as the surface. As a bonus, the TO-46 metal package is safe to solder to a metal surface or pipe. Naturally, in that situation, the metal will serve as the ground for the V terminal of the circuit. You could also install the LM35 inside a metal tube with a closed-end, which you could then submerge in water or screw into a tank’s threaded hole. The LM35 chip and associated cabling and circuitry must be kept dry and insulated, as is the case with any integrated circuit.

The possibility of condensation forming in a cold environment where the circuit may operate emphasizes this importance. Some use coatings and varnishes in printed circuitry, such as conformal coating and epoxy paints or dips, to protect the LM35 device and its connections against corrosion. Improving the response time in low-velocity air and decreasing the thermal time constant by, these components are sometimes soldered to a tiny, lightweight heat fin. However, the sensor could benefit from a modest thermal mass to provide the most stable reading possible, regardless of little changes in ambient temperature.


Because of its extensive power supply voltage range, which extends from 4 V to 30 V, the LM35 device is suitable for various applications. To bypass the power supply voltage in a situation with a lot of background noise, TI suggests connecting V+ to GND using a 0.1 uF capacitor. The noise coming from the power supply will determine whether or not more capacitances are necessary.

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