Overview
The LM335Z is a precision temperature sensor that operates as a 2-terminal zener diode with a breakdown voltage directly proportional to absolute temperature. It provides an output of 10mV per degree Kelvin, making it easy to interface with measurement and control circuits. The device is calibrated directly in Kelvin, eliminating the need for external calibration. It is commonly used in applications requiring accurate temperature measurements from -40°C to +100°C, with typical accuracy of ±1°C.
Structure and Working Principle
The LM335Z consists of a bandgap reference core with additional circuitry to provide a linear voltage output. The sensor behaves like a zener diode where the breakdown voltage varies linearly with temperature. Internally, the device uses the predictable temperature characteristics of semiconductor junctions. The output voltage follows the equation Vout = (10mV/K) × T, where T is the temperature in Kelvin. This simple relationship makes signal conditioning straightforward.
Key Features
The LM335Z offers several notable features including a wide operating temperature range (-40°C to +100°C), low impedance output, and excellent linearity. It requires only a single calibration point for good accuracy. The device operates from a wide supply range (4V to 30V) and draws minimal current (less than 1mA). Its TO-92 package makes it suitable for through-hole mounting in various applications. The sensor is relatively immune to electrical noise, making it robust in industrial environments.
Application Areas
LM335Z finds applications in temperature measurement and control systems across multiple industries. Common uses include HVAC systems, automotive temperature monitoring, and industrial process control. In consumer electronics, it's used in appliances, computers, and battery charging systems. The medical field employs it for equipment temperature monitoring. Its simplicity and reliability make it popular in educational projects and DIY electronics as well.
Maintenance and Precautions
The LM335Z requires minimal maintenance but proper handling extends its lifespan. Avoid exposing the device to temperatures beyond its specified range or to excessive moisture. When soldering, keep temperatures below 300°C and limit soldering time to prevent damage. Ensure proper decoupling capacitors are used in the circuit to minimize noise. For best accuracy, calibrate the sensor at a known temperature point if high precision is required.
B2B Procurement Guide
When procuring LM335Z sensors in bulk, consider the required temperature range, accuracy specifications, and packaging type. TO-92 is the most common package, but other options may be available. Verify manufacturer certifications and quality control processes. Request samples for testing before large orders. Lead times can vary, so plan procurement accordingly. For reference, bulk pricing typically ranges from $0.30 to $1.50 per unit depending on quantity and supplier.
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