LM335AZ

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LM335AZ

+BOM

SENSOR ANALOG -40C-100C TO92-3

  • ManufacturerTexas Instruments

  • Mfr. Part #LM335AZ

  • In Stock3573

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Specifications

Attribute Value
Part Status Obsolete
Base Product Number LM335
Sensor Type Analog, Local
Sensing Temperature - Local -40°C ~ 100°C
Output Type Analog Voltage
Resolution 10mV/°K
Accuracy - Highest (Lowest) ±3°C (±5°C)
Test Condition 25°C (-40°C ~ 100°C)
Operating Temperature -40°C ~ 100°C
Mounting Type Through Hole
Package TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package TO-92-3
Packaging Bulk

Overview

Description

The LM335AZ is a precision temperature sensor designed to operate as a temperature-dependent zener diode. It provides an output voltage directly proportional to the Kelvin temperature scale, making it ideal for temperature measurement applications. The device typically outputs 10 mV per Kelvin, which means at 0°C (273.15K), the output will be approximately 2.73V. It operates over a wide temperature range, typically from -40°C to +100°C, and offers a high degree of accuracy and stability.
Key features of the LM335AZ include low self-heating, high linearity, and ease of calibration. It requires minimal external components, often just a resistor for current limiting, and can be calibrated to improve accuracy by adjusting the output to match the desired temperature reference. The LM335AZ is commonly used in HVAC systems, environmental monitoring, and other temperature sensing applications due to its reliability and ease of integration into various electronic systems.

Equivalent

The LM335AZ is a precision temperature sensor. Equivalent products include the LM35 series, TMP36, and MCP9700. These alternatives offer similar functionalities in temperature sensing applications with varying voltage output and temperature range specifications. It is always important to check the specific requirements of your application to ensure compatibility.

Features

The LM335AZ is a precision temperature sensor that operates in a temperature range from -40°C to +100°C. It provides an output voltage directly proportional to the absolute temperature, measured in Kelvin, with a typical scale factor of 10 mV/K. This makes it easy to interface with various analog-to-digital converters for temperature monitoring applications. The sensor offers a high degree of accuracy, typically ±1°C at room temperature, and can be calibrated for improved precision. The LM335AZ features a low dynamic impedance, allowing it to maintain stable operation over a wide range of temperatures and conditions. It also has a wide operating voltage range, typically from 4V to 30V, which contributes to its versatility in different circuit designs. The device comes in a TO-92 package, making it easy to handle and integrate into various electronic applications. The LM335AZ is ideal for use in applications such as environmental monitoring, consumer electronics, and industrial control systems due to its reliability and straightforward implementation.

Pinout

The LM335AZ is a precision temperature sensor IC with a three-pin configuration. It functions as a temperature sensor that outputs a voltage directly proportional to the Kelvin temperature scale. The pin functions are as follows:
1. Pin 1 (V+ or Positive Supply): This is the input pin for the positive supply voltage to power the device. It typically operates from 5V to 20V.
2. Pin 2 (Vout or Output): This pin outputs a voltage that is linearly proportional to the absolute temperature in Kelvin. The output voltage is approximately 10 mV/K, meaning at 0°C (273.15K), the output voltage would be around 2.7315V.
3. Pin 3 (GND or Ground): This is the ground pin and serves as the reference point for the input voltage and the output signal.
The LM335AZ is used in various applications requiring precise temperature measurements, including environmental monitoring, consumer electronics, and thermal regulation systems.

Manufacturer

The LM335AZ is manufactured by Texas Instruments. Texas Instruments, often abbreviated as TI, is a global semiconductor company that designs and produces a wide range of electronic components, including integrated circuits and sensors. The company is well-known for its innovation in the field of electronics and is a leading provider of solutions for analog and digital embedded and application processing. Founded in 1930 and headquartered in Dallas, Texas, TI has a strong reputation for delivering reliable and high-performance products used in various applications across different industries.

Application

The LM335AZ is a precision temperature sensor used in various applications that require accurate temperature measurements. Key application areas include:
1. Environmental Monitoring: Used in weather stations and HVAC systems for precise temperature control.
2. Industrial Automation: Employed in process control systems to monitor temperature in manufacturing processes.
3. Consumer Electronics: Integrated into devices like thermostats and smart home systems for temperature regulation.
4. Medical Devices: Utilized in equipment that requires stable and accurate temperature readings, such as incubators.
5. Automotive Systems: Used in climate control units and battery management systems for temperature monitoring.
These sensors provide a linear voltage output proportional to temperature in Kelvin, making them versatile for various applications.

Package

The LM335AZ is typically available in a TO-92 package. This package is a plastic through-hole type, commonly used for small transistors and temperature sensors like the LM335AZ.

Frequently Asked Questions


Q: What is the output voltage of the LM335AZ at 25°C?
A: The LM335AZ outputs 10mV per °K. At 25°C (298.15°K), the typical voltage is 2.982V, with an accuracy of ±3°C.


Q: What is the operating temperature range of this sensor?
A: It operates from -40°C to +100°C, ideal for environmental monitoring in this range without requiring external calibration.


Q: Is the LM335AZ suitable for battery-powered designs?
A: Yes, as an analog voltage output device with low self-heating, it consumes minimal current from through-hole mounting, suitable for low-power applications.


Q: What package does the LM335AZ use?
A: It uses a TO-92-3 (TO-226AA) through-hole package, which is easy to solder on PCB or breadboard for prototyping.


Q: What is the resolution of this temperature sensor?
A: It has a fixed scale factor of 10mV/°K, providing linear analog voltage output proportional to absolute temperature.


Q: Can the LM335AZ replace a thermistor in a circuit?
A: Yes, it offers a linear output (10mV/°K) versus thermistor's non-linear resistance, simplifying ADC reading and calibration in designs.


Q: What is the test condition for its accuracy specification?
A: Accuracy is tested at 25°C (±3°C) and over -40°C to 100°C (±5°C), ensuring reliable performance under specified conditions.


Q: Is the LM335AZ obsolete? Can I still use it?
A: Its Part Status is "Obsolete" per manufacturer, but existing stock can be used in legacy designs; consider alternative sensors for new projects.


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