LM234Z-3/NOPB by Texas Instruments | Sensors and Transducers Misc | Avnet ASIA
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LM234Z-3/NOPB

Texas Instruments

Adjustable Current Source 3-Pin TO-92

Manufacturer Part #: LM234Z-3/NOPB

Alternate Part #: LM234Z-3/NOPB


legend RoHS Compliant

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Information

The LM134/LM234/LM334 are 3-terminal adjustable current sources featuring 10,000:1 range in operating current, excellent current regulation and a wide dynamic voltage range of 1V to 40V. Current is established with one external resistor and no other parts are required. Initial current accuracy is ±3%. The LM134/LM234/LM334 are true floating current sources with no separate power supply connections. In addition, reverse applied voltages of up to 20V will draw only a few dozen microamperes of current, allowing the devices to act as both a rectifier and current source in AC applications.

The sense voltage used to establish operating current in the LM134 is 64mV at 25°C and is directly proportional to absolute temperature (°K). The simplest one external resistor connection, then, generates a current with ≈+0.33%/°C temperature dependence. Zero drift operation can be obtained by adding one extra resistor and a diode.

Applications for the current sources include bias networks, surge protection, low power reference, ramp generation, LED driver, and temperature sensing. The LM234-3 and LM234-6 are specified as true temperature sensors with ensured initial accuracy of ±3°C and ±6°C, respectively. These devices are ideal in remote sense applications because series resistance in long wire runs does not affect accuracy. In addition, only 2 wires are required.

The LM134 is specified over a temperature range of −55°C to +125°C, the LM234 from −25°C to +100°C and the LM334 from 0°C to +70°C. These devices are available in TO hermetic, TO-92 and SOIC-8 plastic packages.

 

Key Features

  • Operates From 1V to 40V
  • 0.02%/V Current Regulation
  • Programmable From 1µA to 10mA
  • True 2-Terminal Operation
  • Available as Fully Specified Temperature Sensor
  • ±3% Initial Accuracy
  • Technical Attributes

    Description
    Value
    Find similar Parts
    Mounting
    Through Hole
    Operating Temperature
    -25 to 100 °C
    Max Processing Temp
    260
    Lead Finish
    Tin
    Supplier Package
    TO-92
    Product Dimensions
    5.21 x 4.19 x 5.34
    Category
    Adjustable Current Source
    Type
    Adjustable Current Source
    Pin Count
    3
    MSL Level
    1
    Output Type
    Analog

    ECCN / UNSPSC

    Description
    Value
    ECCN:
    EAR99
    SCHEDULE B:
    8542390000"
    HTSN:
    8542390001"

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