LM35DZ LM35 TO-92 TEMPERATURE SENSOR (CHN)

Description

The LM35 is a precision integrated-circuit temperature sensor with an output voltage linearly proportional to Celsius temperature. Unlike sensors calibrated in Kelvin, the LM35 requires no subtraction of a large constant voltage—at 0°C, the output is 0V, and it rises by 10mV per °C . This direct Celsius scaling makes it exceptionally easy to interface with any ADC.

The LM35DZ is the TO-92 plastic package variant, rated for a 0°C to +100°C operating range (the “D” suffix denotes the restricted temperature range) . It operates from a 4V to 30V supply, draws less than 60µA, and has low self-heating of 0.08°C in still air . The low-impedance output (0.1Ω for 1mA load) allows direct connection to ADC inputs without buffering. Typical accuracy is ±0.25°C at room temperature and ±0.75°C over the full range .

Critical limitations for the (CHN) variant: Chinese-manufactured LM35DZ chips may be counterfeit transistors with no temperature sensing capability, or remarked LM335 sensors with entirely different output characteristics . The TO-92 package has poor thermal coupling to the ambient air compared to metal packages—TI notes that the copper leads are the principal thermal path, so readings may be closer to air temperature than surface temperature unless the leads are thermally bonded to the measurement surface . For applications requiring guaranteed accuracy, verify the chip’s behavior before deployment.

Features

• Direct Celsius Output: 0V at 0°C, 10mV/°C scale factor—no Kelvin offset subtraction required .

• Wide Supply Range (4V–30V): Flexible compatibility with 5V, 12V, and higher systems .

• Low Power Consumption: <60µA current draw, minimizing self-heating .

• Low Self-Heating: 0.08°C in still air .

• Low-Impedance Output: 0.1Ω for 1mA load, suitable for direct ADC connection .

• TO-92 Plastic Package: Standard 3-pin through-hole package for easy prototyping.

• LM35DZ Temperature Range: 0°C to +100°C (the “D” suffix restricts the range vs. the full -55°C to +150°C) .

• No External Calibration Required: Wafer-level trimming provides typical accuracy without user adjustment .

Technical Specifications