LM334S - Constant Current Source and Temperature Sensor

Features

  • 1µA to 10mA Operation
  • 0.02%/V Regulation
  • 0.8V to 40V Operating Voltage
  • Can be Used as Linear Temperature Sensor
  • Draws No Reverse Current
  • Supplied in Standard Transistor Packages

Typical Application

LM334S Typical Application
LM334S Typical Application

Description

The LM134 is a three-terminal current source designed to operate at current levels from 1mA 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 298mA will have a temperature coefficient of 1mA/°C. The temperature dependence is extremely accurate and repeatable. Devices specified as temperature sensors in the 100mA 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LM334S8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LM334S8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LM334Z#PBF TO-92 Z C 05-08-1410 Yes
LM334Z#TRPBF TO-92 Z C 05-08-1410 Yes


LM334S Package Drawing
LM334S Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LM334S8#PBF SO-8 C $1.92 $1.45 Yes
LM334S8#TRPBF SO-8 C $1.98 $1.51 Yes
LM334Z#PBF TO-92 C $1.92 $1.45 Yes
LM334Z#TRPBF TO-92 C $1.98 $1.51 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • 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

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

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