LINEAR TECHNOLOGY LM134 Series Data Sheet
Summary
The LM134 Series is a highly accurate, three-terminal current source designed for stable operation across currents ranging from 1mA to 10mA. Critically, it also functions as a precise temperature sensor because its regulated output current is directly proportional to absolute temperature. This manual details comprehensive electrical characteristics, coverage of applications—including remote sensing and constant-current biasing—and various package types. It is essential for engineers designing sensitive electronic systems requiring reliable and repeatable current regulation or accurate monitoring of ambient temperatures.
Page 1 Text Content
LM134 Series
TEM PERATURE (°C)
Constant Current Source and Temperature Sensor
FEATURES DESCRIPTIO 1µA to 10m A Operation The LM134 is a three-terminal current source designed to 0.02%/V Regulation operate at current levels from 1µA to 10m A, as set by an 0.8V to 40V Operating Voltage external resistor. The device operates as a true two- Can be Used as Linear Temperature Sensor terminal current source, requiring no extra power connec-
Draws No Reverse Current tions or input signals. Regulation is typically 0.02%/V and Supplied in Standard Transistor Packages terminal-to-terminal voltage can range from 800m V to 40V. APPLICATIO S Because the operating current is directly proportional to absolute temperature in degrees Kelvin, the device will
Current Mode Temperature Sensing
also find wide applications as a temperature sensor. The
Constant Current Source for Shunt References
temperature dependence of the operating current is
Cold Junction Compensation
0.336%/°C at room temperature. For example, a device
Constant-Gain Bias for Bipolar Differential Stage
operating at 298µA will have a temperature coefficient of
Micropower Bias Networks
1µA/°C. The temperature dependence is extremely accu-
TE PE RA TU RE (° K)
Buffer for Photoconductive Cell
rate and repeatable. Devices specified as temperature
Current Limiter
sensors in the 100µA to 1m A range are the LM134-3, LM234-3 and the LM134-6, LM234-6, with the dash numbers indicating ±3°C and ±6°C accuracies, respec- tively. If a zero temperature coefficient current source is re- quired, this is easily achieved by adding a diode and a resistor., LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO Remote Temperature Sensor with Voltage Output Operating Current vs Temperature
VIN ≥ 5V
RSET = 226Ω
226Ω LM234-3 V–
TA01a
OPERATING CURRENT (µA)
TA01b
Page Summary Contents For LINEAR TECHNOLOGY LM134 Series Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 12 |
| File Size | 155.09 KB |
| Published | June 17, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
What is the operational current range for the LM134 series?
The device operates at current levels from 1mA to 10mA.
Can this device be used as a temperature sensor?
Yes, because the operating current is proportional to absolute temperature in degrees Kelvin. The dedicated models are LM134-3 and LM234-3, among others.
How accurate is the temperature sensing for certain devices (e.g., LM234-3)?
The accuracy varies by model, but the temperature dependence can be specified, with some versions offering -3°C or -6°C accuracies.
What are the minimum and maximum operating voltages?
The minimum operational voltage is 0.8V (for currents between 2mA and 100mA), and the maximum external resistor voltage is 40V.