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LM334S - Constant Current Source and Temperature Sensor

Most H (Metal Can), J (Ceramic), and K (Metal Can) Packages from Linear Technology Are Now Obsolete

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The LM134 is a three-terminal current source designed to operate at current levels from 1µA to 10mA, as set by an external resistor. The device operates as a true two-terminal current source, requiring no extra power connections or input signals. Regulation is typically 0.02%/V and terminal-to-terminal voltage can range from 800mV to 40V.

Because the operating current is directly proportional to absolute temperature in degrees Kelvin, the device will also find wide applications as a temperature sensor. The temperature dependence of the operating current is 0.336%/°C at room temperature. For example, a device operating at 298µA will have a temperature coefficient of 1µA/°C. The temperature dependence is extremely accurate and repeatable. Devices specified as temperature sensors in the 100µA to 1mA range are the LM134-3, LM234-3 and the LM134-6, LM234-6, with the dash numbers indicating ±3°C and ±6°C accuracies, respectively.

If a zero temperature coefficient current source is required, this is easily achieved by adding a diode and a resistor.

特点 1µA to 10mA Operation 0.02%/V Regulation 0.8V to 30V Operating Voltage Can Be Used as Linear Temperature Sensor Draws No Reverse Current Supplied in Standard Transistor Packages 典型应用

应用 Current Mode Temperature Sensing Constant Current Source for Shunt References Cold Junction Compensation Constant-Gain Bias for Bipolar Differential Stage Micropower Bias Networks Buffer for Photoconductive Cell Current Limiter 封装信息