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LM334S - Constant Current Source and Temperature Sensor

Datasheet

Documentation

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

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

SO-8,TO-92

Order Info

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*
LM334S8#PBF	SO	8	C	$1.92	$1.45
LM334S8#TRPBF	SO	8	C	$1.98	$1.51
LM334Z#PBF	TO-92	3	C	$1.92	$1.45
LM334Z#TRPBF	TO-92	3	C	$1.98	$1.51
LM334S8	SO	8	C	$3.84	$2.90
LM334S8#TR	SO	8	C	$3.96	$3.02
LM334Z	TO-92	3	C	$3.84	$2.90
LM334Z#TR	TO-92	3	C	$3.96	$3.02

^* 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.