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LM335AZ/NOPB

10mV/K analog temp sensor, +/-1C, TO-92, zener output

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Manufacturer Part：

LM335AZ/NOPB

Package：

TO-92 (5.2 x 3.68 mm), through-hole

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Description

Product Overview

The LM335AZ/NOPB from Texas Instruments is a precision analog temperature sensor operating as a 2-terminal zener with 10mV/K output in a TO-92 through-hole package. With +/-1C initial accuracy at 25C, 400uA to 5mA operating current, less than 1 Ohm dynamic impedance, and easy calibration, it provides a linear Kelvin-proportional voltage output for temperature sensing from -40C to +100C.

Key Specifications

Output Type Analog, 10 mV/K (Kelvin-proportional)
Accuracy at 25C +/-1C (LM335A version); +/-3C (LM335)
Accuracy over -40 to +100C +/-2.7C typical (calibrated at 25C)
Operating Current 400 uA to 5 mA
Dynamic Impedance Less than 1 Ohm
Output Voltage at 25C 2.982 V (298.2K x 10mV/K)
Temperature Coefficient 10 mV/K (linear)
Calibration External trim pot (third pin ADJ)
Operating Temperature -40 to +100 C (LM335); -55 to +150C (LM135)
Thermal Resistance 202 C/W junction-to-ambient (TO-92)
Package TO-92 (5.2 x 3.68 mm), through-hole
Status Active
RoHS Yes

Features

  • Directly calibrated to Kelvin temperature scale
  • +/-1C initial accuracy (A grade)
  • Operates from 400uA to 5mA
  • Less than 1 Ohm dynamic impedance
  • Easily calibrated with single external pot
  • Linear output simplifies interfacing
  • Low cost precision temperature sensing
  • TO-92 hermetic and plastic packages

Applications

  • General-purpose temperature sensing
  • Thermocouple cold-junction compensation
  • Temperature controllers and thermostats
  • Power supply thermal protection

The LM335AZ/NOPB from Texas Instruments is a precision analog temperature sensor that operates as a 2-terminal zener diode with a breakdown voltage directly proportional to absolute temperature at 10mV/K. The A denotes the +/-1C accuracy grade (vs +/-3C for LM335), Z denotes the TO-92 plastic package, and /NOPB indicates lead-free (RoHS compliant). The device outputs a voltage equal to the temperature in Kelvin multiplied by 10mV/K: at 25C (298.15K), the output is approximately 2.982V. The third pin (ADJ) allows single-point calibration by connecting a 10kOhm potentiometer between the ADJ and negative terminals, trimming the output to the exact value at a known reference temperature. When calibrated at 25C, the LM335A maintains typically less than 1C error over a 100C range. The less-than-1-Ohm dynamic impedance ensures that the output voltage is virtually independent of operating current over the 400uA to 5mA range. The linear Kelvin output simplifies interface circuitry: an ADC with a 2.5V or 3.0V reference can directly measure temperature, and a simple op-amp circuit can convert Kelvin to Celsius by subtracting the 2.7315V offset.

The LM335AZ/NOPB operates through three subsystems: (1) Zener Temperature Sensing: The core is a bandgap reference circuit where the difference in VBE of two transistors operating at different current densities produces a PTAT (proportional to absolute temperature) voltage. This PTAT voltage is amplified to the 10mV/K scale factor and drives the zener-like output. The device behaves like a temperature-dependent zener diode: when reverse-biased through a series resistor from a supply, it regulates at a voltage proportional to absolute temperature. (2) Current Regulation: The low dynamic impedance (<1 Ohm) means the output voltage changes by less than 1mV per mA of operating current variation. This allows the device to be powered from any supply voltage through a simple series resistor, as long as the current stays within 400uA to 5mA. The resistor value is calculated as R = (Vsupply – Vout) / Ioperating, typically targeting 1mA at the highest operating temperature. (3) Calibration: The ADJ pin connects to the internal divider that sets the output voltage. An external potentiometer between ADJ and the negative terminal adjusts the output by +/-3C range. When the output is trimmed to read correctly at one temperature (typically 25C = 2.982V), the inherent linearity of the bandgap circuit ensures accuracy across the entire range.

Pin Name Type Description
1 ADJ Input Calibration adjust (connect 10k pot to negative)
2 + Output Positive terminal (10mV/K output)
3 – Power Negative terminal (ground reference)
  • General temperature sensing with 1mA bias through 6.8kOhm resistor from 10V supply, ADC reads 2.982V at 25C with 10mV/K slope
  • Thermocouple cold-junction compensation using LM335 at the reference junction, subtracting its output from the thermocouple voltage
  • Differential temperature measurement using two LM335 devices with an op-amp subtractor, output = 10mV/K x delta-T
  • Simple thermostat using LM335 output compared against a reference voltage by a comparator to control heating/cooling
Model Manufacturer Accuracy Output Notes
LM135H/NOPB TI +/-1C 10mV/K -55 to +150C, hermetic TO-46
TMP235AEDBZR TI +/-1C 10mV/C Celsius output, SOT-23
LM335H/NOPB TI +/-3C 10mV/K Lower accuracy, TO-46 hermetic
LMT87LPG TI +/-1.5C 10mV/C Low voltage, TO-92
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