Home Power management Voltage references Current references & sources
Home
Power management
Voltage references
Current references & sources

LM334

ACTIVE

0°C to 70°C 3-pin adjustable current source

Order now
Data sheet

LM334

ACTIVE
Data sheet Order now

Product details

Rating Catalog Iout/Iz (max) (mA) 10 Vin (min) (V) 0.8 Vin (max) (V) 40 Initial accuracy (max) (%) 6 Operating temperature range (°C) -40 to 85
Rating Catalog Iout/Iz (max) (mA) 10 Vin (min) (V) 0.8 Vin (max) (V) 40 Initial accuracy (max) (%) 6 Operating temperature range (°C) -40 to 85
SOIC (D) 8 29.4 mm² 4.9 x 6 TO-92 (LP) 3 19.136 mm² 5.2 x 3.68 WAFERSALE (YS) — See data sheet
  • 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

All trademarks are the property of their respective owners.

  • 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

All trademarks are the property of their respective owners.

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.

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.
filter Find other Current references & sources
Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 10
Type Title Date
* Data sheet LM134/LM234/LM334 3-Terminal Adjustable Current Sources datasheet (Rev. E) 20 Jun 2013
E-book Tips and tricks for designing with voltage references (Rev. A) 07 May 2021
Application note Precision Current Sources and Sinks Using Voltage References 30 Jun 2020
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note AN-256 Circuitry for Inexpensive Relative Humidity Measurement (Rev. B) 06 May 2013
Application note AN-240 Wide-Range Current-to-Frequency Converters (Rev. B) 29 Apr 2013
Application note AN-C V/F Converter ICs Handle Frequency-to-Voltage Needs (Rev. B) 23 Apr 2013
More literature Die D/S LM334 MWC 3-Terminal Adj Current Source 21 Sep 2012
Application note TO-92 Packing Options / Ordering Instructions (Rev. A) 23 Jun 2010
Application note Applying a New Precision Op Amp 04 Oct 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Calculation tool

SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR — Shunt Voltage Reference External Resistor Quick Start Calculator

This external resistor quick-start calculator tool lets you easily calculate valid external resistor values relative to voltage reference, supply and load-current bounds. With these inputs, you can instantly view the resulting calculations and use the color-coded indications to understand (...)

Supported products & hardware

Supported products & hardware

Products
Die & wafer services
Shunt voltage references
  • ATL431 — 2.5-V low-IQ adjustable precision shunt regulator
  • LM136-2.5-N — Voltage Reference Diode
  • LM136-5.0 — 5.0V Reference Diode
  • LM136-5.0QML — 5.0V Reference Diode
  • LM136A-2.5QML — 2.5V Reference Diode
  • LM136A-2.5QML-SP — Radiation-hardened QMLV, 2.5-V shunt voltage reference
  • LM136A-5.0QML — 5.0V Reference Diode
  • LM185-1.2-N — Micropower Voltage Reference Diode
  • LM185-1.2QML — Micropower Voltage Reference Diode
  • LM185-1.2QML-SP — Radiation-hardened QMLV, 1.2-V shunt voltage reference
  • LM185-2.5-N — Micropower Voltage Reference Diode
  • LM185-2.5QML — Micropower Voltage Reference Diode
  • LM185-2.5QML-SP — Space-grade QMLV 2.5-V  shunt voltage reference
  • LM185-ADJ — Adjustable Micropower Voltage Reference
  • LM185QML — Adjustable Micropower Voltage Reference
  • LM285-1.2 — 1.235-V, –40°C to +85°C, micropower voltage reference
  • LM285-1.2-N — 1.235-V, –40°C to +85°C, micropower voltage reference diode
  • LM285-2.5 — 2.5-V, –40°C to +85°C, micropower voltage reference
  • LM285-2.5-N — 2.5-V, –40°C to +85°C, micropower voltage reference diode
  • LM285-ADJ — Adjustable, 85°C, micropower voltage reference
  • LM336-2.5 — 0°C to 70°C, 2.5-V integrated reference circuit
  • LM336-2.5-N — Voltage reference diode
  • LM336-5.0 — 5-V reference diode
  • LM385-1.2 — 1.235-V, 2%, 0°C to 70°C, micropower voltage reference
  • LM385-1.2-MIL — Micropower Voltage Reference
  • LM385-1.2-N — 1.235-V, 0°C to 70°C, micropower voltage reference diode
  • LM385-2.5 — 2.5-V, 2%, 70°C, micropower voltage reference
  • LM385-2.5-N — 2.5-V, 0°C to 70°C, micropower voltage reference diode
  • LM385-ADJ — Adjustable, 70°C, micropower voltage reference
  • LM4030 — Ultra-high-precision shunt voltage reference
  • LM4040 — Fixed voltage, 45-µA, precision micropower shunt voltage reference
  • LM4040-N — 100-ppm/°C precision micropower shunt voltage reference
  • LM4040-N-Q1 — Automotive, 100-ppm/°C precision micropower shunt voltage reference
  • LM4041-N — Fixed & adjustable, 45-µA, precision micropower shunt voltage reference
  • LM4041-N-Q1 — Automotive, precision micropower shunt voltage reference
  • LM4050-N — 50-ppm/°C precision micropower shunt voltage reference
  • LM4050-N-Q1 — Automotive, 50-ppm/°C precision micropower shunt voltage reference
  • LM4050QML-SP — Radiation-hardened QMLV, 2.5-V or 5-V shunt voltage reference
  • LM4051-N — Fixed & adjustable, precision micropower shunt voltage reference
  • LM431 — 2%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator
  • LM4431 — Micropower shunt voltage reference
  • LMV431 — 1.5%, low-voltage (1.24-V) adjustable precision shunt regulator
  • LMV431A — 1%, low-voltage (1.24-V) adjustable precision shunt regulator
  • LMV431B — 0.5%, low-voltage (1.24-V) adjustable precision shunt regulator
Current references & sources
  • LM134 — 3-Terminal Adjustable Current Source
  • LM234 — 100°C 3-pin adjustable current source
  • LM334 — 0°C to 70°C 3-pin adjustable current source
Download
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Request
Reference designs

TIDA-00500 — Capacitor-Based Backup Power Supply for PLC Modules Reference Design

TIDA-00500 is a reference design to provide power to load for short duration of time after a power interrupt has occurred. Traditionally Programmable Logic Controllers (PLCs) are equipped with a recharge battery source for alternative power. This battery source often suffers from drawbacks like (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOIC (D) 8 Ultra Librarian
TO-92 (LP) 3 Ultra Librarian
WAFERSALE (YS) —
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos