LM334 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments LM334 is a 3-terminal adjustable current source operating up to 40 V, programmable from 1 µA to 10 mA with a single external resistor, housed in an SOIC package. Suitable for temperature sensing, LED driving, and biasing circuits. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LM334 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM334?
- Adjustable output current from 1 µA to 10 mA set by a single external resistor, eliminating complex biasing networks
- Wide operating voltage from 1 V to 40 V supports both low-voltage battery circuits and industrial 24 V supply rails
- Built-in PTAT (proportional-to-absolute-temperature) characteristic enables direct use as a temperature-to-current sensor without calibration ICs
What is LM334 used for?
The LM334 is widely used as a precision current source to bias photodiodes, LEDs, and reference circuits in industrial measurement equipment and laboratory instrumentation operating up to 40 V. Its inherent PTAT output current of approximately 227 µA/K at room temperature makes it a straightforward temperature sensor when connected to a transimpedance amplifier, eliminating the need for additional signal conditioning ICs. Audio engineers also deploy it as a constant-current tail source in differential amplifier pairs, where supply rejection above 40 dB maintains low noise floors in analog mixing consoles.
What are the specifications of LM334?
| YTEOL | EYTEOL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Country of Origin | Country of Origin |
Where can I find the LM334 datasheet?
LM334 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM334?
Compatible alternatives and drop-in replacements for LM334:
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Frequently Asked Questions
What current range can the LM334 be programmed to source using an external resistor?
With a single external resistor, the LM334 can be programmed to source between 1 µA and 10 mA of output current; for example, a 68 Ohm resistor sets approximately 1 mA at 25 degrees C, making it straightforward to calibrate the current for LED biasing or 4-20 mA loop transmitter applications.
How does the LM334 behave as a temperature sensor, and what sensitivity does it provide?
The LM334's PTAT characteristic causes its set current to track temperature proportionally at roughly 0.336% per degree C; configured as a 1 mA source, the output current increases by 3.36 µA per degree C rise, allowing a 1 kOhm sense resistor to produce a 3.36 mV per degree C voltage signal directly readable by a 12-bit ADC.
What is the maximum operating voltage of the LM334 and which industrial supply rails does it accommodate?
The LM334 operates with a compliance voltage up to 40 V across its terminals, comfortably covering the 24 V rails standard in PLC and DCS analog output modules, the 12 V rails in automotive sensor heads, and the 3.3 V to 5 V rails in battery-powered portable instruments—all without requiring a voltage regulator stage.
How does the LM334 in SOIC package compare to its TO-92 variant for PCB integration?
The SOIC version of the LM334 occupies approximately 5 mm x 4 mm of PCB area with 1.27 mm pin pitch, enabling automated SMT assembly at standard reflow profiles up to 260 degrees C peak; the through-hole TO-92 alternative requires a 5 mm lead-bend area and hand-soldering, making the SOIC variant the preferred choice for production PCB assemblies with component density above 20 parts per cm2.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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