LM334MWC Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
LM334MWC is a 3-terminal adjustable current source and temperature sensor IC from Texas Instruments operating from 0.8 V to 40 V supply. It sets output current from 1 µA to 10 mA via a single external resistor, making it a versatile reference and biasing component for precision analog circuits.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LM334MWC Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Adjustable output current from 1 µA to 10 mA set by a single external resistor over a 0.8 V to 40 V supply range
- Built-in temperature-proportional current characteristic (approximately +0.336%/°C) enables use as a direct temperature sensor
- 3-terminal uncased die format for hybrid module integration where minimum parasitic capacitance and PCB area are critical
Applications
The LM334MWC serves as a precision current reference in analog instrumentation circuits, biasing transimpedance amplifiers and photodiode front-ends where stable µA-level currents over a wide 0.8 V to 40 V supply range are required. Temperature measurement systems exploit its inherent +0.336%/°C current-temperature characteristic to convert ambient temperature directly into a proportional current without additional transducers. Hybrid module designers use the uncased die format of LM334MWC to minimize parasitic elements in space-constrained oscillator and bandgap reference circuits.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | ANALOG CIRCUIT |
| Input Voltage-Max | 40V |
| Input Voltage-Min | 0.8V |
| JESD-30 Code | X-XUUC-N |
| Number of Functions | 1 |
| Package Body Material | UNSPECIFIED |
| Package Shape | UNSPECIFIED |
| Package Style | UNCASED CHIP |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 40V |
| Supply Voltage-Min (Vsup) | 1V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Form | NO LEAD |
| Terminal Position | UPPER |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How is the output current of LM334MWC set, and what range of currents can be programmed?
The LM334MWC output current is determined by a single external resistor connected between its R and V− terminals. The programmable range spans from 1 µA to 10 mA, with the set voltage across the resistor being approximately 67.7 mV at 25°C. Choosing a 6.77 kΩ resistor sets 10 µA output, while a 677 Ω resistor sets 100 µA, giving designers a straightforward single-component trim over a 4-decade current range.
How can LM334MWC be used as a temperature sensor, and what sensitivity does it provide?
The LM334MWC exhibits a temperature coefficient of approximately +0.336%/°C in its output current, meaning the current increases linearly with temperature. At a set current of 1 mA, this translates to 3.36 µA/°C of sensitivity. A precision 1 kΩ shunt resistor converts this current variation into approximately 3.36 mV/°C, suitable for driving a low-offset op-amp stage in a direct temperature measurement circuit without a dedicated thermistor or RTD.
In a photodiode biasing application, why is the wide 0.8 V to 40 V supply range of LM334MWC advantageous over a fixed current reference?
Photodiode bias circuits in optical transceivers and industrial sensors may use supply rails ranging from 3.3 V to 36 V depending on the system architecture. The LM334MWC operates across this entire 0.8 V to 40 V range from a single device, eliminating the need for separate current references per supply rail. Its 1 µA to 10 mA programming range also allows fine bias adjustment to match specific reverse-bias leakage targets without changing the IC, reducing design iteration time.
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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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