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Product details

Parameters

Iout/Iz (Max) (mA) 0.01 Vin (Min) (V) 0.8 Vin (Max) (V) 40 Operating temperature range (C) -40 to 85, 0 to 70 Initial accuracy (Max) (%) 6 open-in-new Find other Current references

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 TO-92 (LP) 3 19 mm² 5.2 x 3.68 open-in-new Find other Current references

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

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Description

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.

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Technical documentation

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Type Title Date
* Datasheet LM134/LM234/LM334 3-Terminal Adjustable Current Sources datasheet (Rev. E) Jun. 20, 2013
White papers Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
White papers Tips and tricks for designing with voltage references May 30, 2017
Application notes AN-256 Circuitry for Inexpensive Relative Humidity Measurement (Rev. B) May 06, 2013
Application notes AN-240 Wide-Range Current-to-Frequency Converters (Rev. B) Apr. 29, 2013
Application notes AN-C V/F Converter ICs Handle Frequency-to-Voltage Needs (Rev. B) Apr. 23, 2013
More literature Die D/S LM334 MWC 3-Terminal Adj Current Source Sep. 21, 2012
Application notes TO-92 Packing Options / Ordering Instructions (Rev. A) Jun. 23, 2010
Application notes Applying a New Precision Op Amp Oct. 04, 2004

Design & development

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Reference designs

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CAD/CAE symbols

Package Pins Download
(YS) 0 View options
SOIC (D) 8 View options
TO-92 (LP) 3 View options

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