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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Current Regulation/Management

Texas Instruments LM334 MWC

Name: LM334 MWC
Brand: Texas Instruments
SKU: LM334 MWC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM334 MWC

Manufacturer:: Texas Instruments

Category:: Current Regulation/Management

Package:: Die

Datasheet:: LM334 MWC.pdf

Description:: IC CURRENT SOURCE 6% WAFERSALE

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM334 MWC from Texas Instruments is a 3-terminal adjustable current source optimized for 0°C to +70°C operation, delivering programmable output from 1 μA to 10 mA with ±3% initial accuracy, 0.02%/V current regulation, and true 2-terminal operation. It serves as a precision bias generator, temperature sensor, and LED driver in industrial instrumentation and low-power analog systems.

For engineers reviewing the LM334 MWC datasheet, LM334 MWC pinout, LM334 MWC application, or LM334 MWC equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for current-source design and thermal sensing implementations.

Technical Context

The LM334 MWC operates as a floating two-terminal current source with no separate power supply pins; current is set by an external resistor connected between V+ and V−, establishing I_SET = 67.7 mV / R_SET at 25°C. Its sense voltage is temperature-proportional (≈214 μV/°K), enabling direct Kelvin-scale temperature measurement.

It features reverse-voltage tolerance up to 20 V, minimum operating voltage of 0.8 V at low currents, and 15 pF shunt capacitance. Thermal coefficient is +0.336%/°C at 25°C, and it supports zero-drift configuration via external diode/resistor compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Set Current Range	1 μA to 10 mA - fully programmable with single external resistor; enables micropower biasing and high-accuracy current sourcing
Initial Accuracy	±3% - ensures predictable output without calibration in most applications
Current Regulation	0.02%/V - maintains stable current over 1–40 V supply range, critical for variable-voltage systems
Temperature Coefficient	+0.336%/°C - linearly proportional to absolute temperature, enabling direct remote temperature sensing
Operating Voltage Range	1 V to 40 V forward, −20 V reverse - supports AC-coupled and bidirectional current-source operation
Minimum Operating Voltage	0.8 V at 2 μA–100 μA - allows ultra-low-voltage biasing in energy-constrained circuits
Shunt Capacitance	15 pF - limits high-frequency impedance; bufferable to <3 pF for RF-sensitive applications

Pinout & Package

LM334 MWC is a wafer-sale (WAFERSALE) product - not packaged in a discrete surface-mount or through-hole format. It is supplied as bare die on wafer, intended for integration into custom hybrid modules or multi-chip assemblies. No pinout table is applicable.

Key Features

Feature	Design Value
True 2-terminal operation	Eliminates need for dedicated ground or supply rails - simplifies wiring in remote sensor and loop-powered systems
Temperature-proportional current	Enables absolute-temperature measurement with only two wires and no signal degradation over distance
Reverse-voltage survival	Draws <50 μA at −20 V - permits use in AC line-sensing and rectifier-assisted current-source topologies
Zero-drift configuration support	External diode + resistor network cancels inherent +0.336%/°C drift, achieving <±1% tempco after gain trim
Low minimum operating voltage	0.8 V start-up enables operation from coin cells or harvested energy sources in IoT edge nodes

Applications

Remote Temperature Sensing	Low-Power Bias Network
Use Scenario: Measuring ambient or junction temperature in HVAC controllers using 100 m cable runs between sensor and readout circuit. IC Role / Device Role / Timing Role: Two-wire Kelvin-referenced current source converting temperature to proportional current (I_OUT = 1 μA/K). Use Value: Eliminates lead resistance error; ±3°C accuracy maintained without calibration due to inherent zero-offset extrapolation to 0 K.	Use Scenario: Providing stable 10 μA bias current to input stage of a low-noise op-amp in battery-powered medical sensor front-end. IC Role / Device Role / Timing Role: Micropower current source setting transconductance and offset point for amplifier DC operating point. Use Value: Delivers precise 10 μA with 0.02%/V regulation across 1.8–3.6 V battery discharge curve, ensuring consistent gain and noise performance.
LED Constant-Current Driver	Ramp Generator for ADC Testing
Use Scenario: Driving indicator LEDs in industrial HMI panels where supply voltage varies from 12–24 V DC. IC Role / Device Role / Timing Role: Adjustable current sink regulating LED brightness independent of rail fluctuations. Use Value: Maintains constant luminance over full input range with ±3% initial tolerance and <0.1% current shift from 12 V to 24 V.	Use Scenario: Generating linear voltage ramps for testing SAR ADC linearity and integral nonlinearity (INL). IC Role / Device Role / Timing Role: Precision current source charging timing capacitor to produce controlled dV/dt ramp waveform. Use Value: Enables sub-0.1% ramp linearity with 1 nA–10 μA programmability; slew-limited only above 1 V/μs at 1 mA setpoint.

Remote Temperature Sensing

Low-Power Bias Network

Use Scenario: Measuring ambient or junction temperature in HVAC controllers using 100 m cable runs between sensor and readout circuit.

IC Role / Device Role / Timing Role: Two-wire Kelvin-referenced current source converting temperature to proportional current (I_OUT = 1 μA/K).

Use Value: Eliminates lead resistance error; ±3°C accuracy maintained without calibration due to inherent zero-offset extrapolation to 0 K.

Use Scenario: Providing stable 10 μA bias current to input stage of a low-noise op-amp in battery-powered medical sensor front-end.

IC Role / Device Role / Timing Role: Micropower current source setting transconductance and offset point for amplifier DC operating point.

Use Value: Delivers precise 10 μA with 0.02%/V regulation across 1.8–3.6 V battery discharge curve, ensuring consistent gain and noise performance.

LED Constant-Current Driver

Ramp Generator for ADC Testing

Use Scenario: Driving indicator LEDs in industrial HMI panels where supply voltage varies from 12–24 V DC.

IC Role / Device Role / Timing Role: Adjustable current sink regulating LED brightness independent of rail fluctuations.

Use Value: Maintains constant luminance over full input range with ±3% initial tolerance and <0.1% current shift from 12 V to 24 V.

Use Scenario: Generating linear voltage ramps for testing SAR ADC linearity and integral nonlinearity (INL).

IC Role / Device Role / Timing Role: Precision current source charging timing capacitor to produce controlled dV/dt ramp waveform.

Use Value: Enables sub-0.1% ramp linearity with 1 nA–10 μA programmability; slew-limited only above 1 V/μs at 1 mA setpoint.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable current-source applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM334M/NOPB	SOIC-8 packaged version with same electrical specs; rated 0°C to +70°C; includes SET pin for 3-terminal configuration option	Requires PCB footprint and soldering; supports both 2-terminal and 3-terminal modes via pin configuration	Select when board-level assembly and flexibility in connection topology are required
LM334Z/NOPB	TO-92 plastic package; identical current-source core; same ±3% accuracy and 0.336%/°C tempco; 0°C to +70°C rating	Through-hole mounting; higher thermal resistance (θ_JA = 180°C/W); suited for prototyping and low-volume production	Select when manual assembly, thermal isolation, or legacy through-hole compatibility is needed

Compared with LM334 MWC, LM334M/NOPB offers standardized SOIC packaging and dual-mode operation but adds layout overhead, while LM334Z/NOPB provides mechanical robustness and ease of hand-soldering at the cost of reduced power dissipation capability and larger footprint.

Availability

LM334 MWC is available at Aetrix Electronics and suitable for remote temperature sensing, low-power bias networks, LED constant-current driving, and precision ramp generation requiring stable component supply across industrial and embedded design cycles.

Supply support for LM334 MWC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and communications markets.

The LM334 series belongs to TI's precision analog current-source product line, designed specifically for applications demanding accurate, temperature-aware, and supply-insensitive current generation in resource-constrained environments.

FAQ

What is the operating temperature range for LM334 MWC?

The LM334 MWC is specified for operation from 0°C to +70°C. This range is confirmed in TI's official PACKAGE OPTION ADDENDUM and aligns with the LM334 family's commercial-grade rating. It does not support extended industrial (−40°C to +85°C) or military ranges like the LM134 or LM234 variants. The LM334 MWC's thermal characteristics are optimized for stability within this window.

Does LM334 MWC have a defined pinout or package footprint?

No - LM334 MWC is a wafer-sale (WAFERSALE) product with no discrete package or standard pinout. It is delivered as bare die on silicon wafer, intended for integration into custom hybrid modules, multi-die substrates, or proprietary ASIC co-packaging. Engineers must define interconnect geometry and thermal management per their assembly process.

How is current set on LM334 MWC, and what is the reference voltage?

Current is set using a single external resistor (R_SET) between V+ and V− terminals. At 25°C, the internal sense voltage is 67.7 mV, so I_SET = 67.7 mV / R_SET. This voltage scales linearly with absolute temperature (214 μV/°K), making LM334 MWC inherently temperature-proportional and usable as a Kelvin sensor.

Can LM334 MWC be used in reverse-biased (AC) applications?

Yes - LM334 MWC tolerates reverse voltages up to 20 V and draws only a few dozen microamperes under reverse bias. This enables its use in AC line-sensing, half-wave rectified current sources, and bidirectional current-loop interfaces where polarity alternates. Forward operation remains valid from 1 V to 40 V.

What is the minimum supply voltage required for LM334 MWC to regulate accurately?

LM334 MWC requires a minimum forward voltage of 0.8 V when set for 2 μA ≤ I_SET ≤ 100 μA, rising to 1.0 V for I_SET > 1 mA. Below these thresholds, regulation degrades or ceases. This ultra-low dropout enables operation from single-cell batteries, energy harvesters, and low-voltage logic rails - a key advantage over fixed-reference-based current sources.

LM334 MWC Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: Die

Packaging:: Bulk

Product Status:: Active

Function:: Current Source

Sensing Method:: -

Accuracy:: ±6%

Voltage - Input:: 1V ~ 40V

Current - Output:: Adjustable

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: Wafersale

LM334 MWC FAQ

1.How can I place an order for LM334 MWC through Aetrix?

Please submit a Request for Quotation (RFQ) for LM334 MWC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM334 MWC reliable?

The price and inventory of LM334 MWC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM334 MWC is usually 5 days.

3.What payment methods are accepted for LM334 MWC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM334 MWC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM334 MWC?

LM334 MWC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM334 MWC order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM334 MWC?

For technical support, including LM334 MWC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM334 MWC requirements.

6.How does Aetrix verify that LM334 MWC is sourced from the original manufacturer or authorized distributors?

All LM334 MWC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM334 MWC meets industry standards.

7.What is the process for return or replacement of LM334 MWC?

All LM334 MWC units undergo pre-shipment inspection (PSI). If there is an issue with LM334 MWC, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM334 MWC part is unused and in its original packaging.

Return procedure for LM334 MWC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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