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

STMicroelectronics LM334DT

Name: LM334DT
Brand: STMicroelectronics
SKU: LM334DT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM334DT

Manufacturer:: STMicroelectronics

Category:: Current Regulation/Management

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LM334DT.pdf

Description:: IC CURRENT SOURCE 3% 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:2,445

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Product details

Overview

LM334DT from STMicroelectronics is a three-terminal adjustable current source optimized for precision biasing, temperature sensing, and low-power reference applications. It delivers programmable current from 1µA to 10mA with ±3% initial accuracy, 0.02%/V regulation, and operates over 1V–40V supply range. Its 64mV control voltage at +25°C is directly proportional to absolute temperature (°K), enabling accurate remote temperature measurement in industrial sensor interfaces.

For engineers reviewing the LM334DT datasheet, LM334DT pinout, LM334DT application, or LM334DT equivalent, key selection criteria include its wide dynamic voltage range, temperature-proportional output, minimal external component requirement (single resistor), and SO-8 package suitability for automated assembly and thermal management in space-constrained analog circuits.

Technical Context

The LM334DT implements a two-transistor current mirror architecture with on-chip temperature-sensing junction, where the ADJ pin voltage is fixed at 64mV at +25°C and scales linearly with Kelvin temperature. Its set current follows I_set = 67.7mV / R_set at 25°C, enabling predictable calibration without trimming components.

It functions as a true 2-terminal current source when configured with external resistor, supports reverse voltage tolerance up to 20V (leakage < several µA), and maintains stable operation across 0°C to +70°C ambient - matching its specified operating range. Output impedance exceeds 10 MΩ at DC, and shunt capacitance is 15 pF.

Key Specifications

Parameter	Value and Actual Design Meaning
Set Current Range	1 µA to 10 mA - fully programmable via single external resistor; enables micropower bias and precision reference design
Initial Accuracy	±3% - ensures reliable current setting without post-manufacture calibration in most industrial sensor applications
Current Regulation	0.02%/V - maintains stable output despite supply ripple or line variation in unregulated power rails
Operating Voltage Range	1 V to 40 V - supports operation from low-voltage battery systems to industrial 24V/36V supplies
Temperature Coefficient	0.33%/°C (uncompensated) - direct Kelvin proportionality enables high-accuracy remote temperature sensing
Control Pin Voltage	64 mV at +25°C - stable reference for resistor-based current programming; tracks absolute temperature linearly
Shunt Capacitance	15 pF - defines high-frequency output impedance limit; reducible with FET cascode for AC-critical applications

Pinout & Package

LM334DT is housed in an SO-8 plastic micropackage (ECOPACK® compliant, lead-free). The package measures 4.90 mm × 3.90 mm × 1.25 mm (typ.) and supports surface-mount reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (NC)	No Connect	Internally unused; must be left floating or tied to ground per layout best practice
2 (NC)	No Connect	Internally unused; no electrical function; avoid routing signals nearby
3 (V−)	Negative Supply Terminal	Serves as current sink return path; sets reference potential for ADJ pin and internal bandgap
4 (NC)	No Connect	Internally unused; electrically isolated from die
5 (NC)	No Connect	Internally unused; no bond wire connection
6 (ADJ)	Current Set Control	64 mV reference node at +25°C; connected to external resistor to program I_set
7 (NC)	No Connect	Internally unused; no functional role
8 (V+)	Positive Supply Terminal	Current source output terminal; sinks programmed current from load into V−

Key Features

Feature	Design Value
Single-resistor programming	Eliminates need for op-amps or DACs; I_set = 67.7mV/R_set simplifies BOM and layout
Temperature-proportional output	Enables Kelvin-referenced remote temperature sensing with gain-only calibration (no offset trim)
Reverse voltage tolerance	Withstands −20 V at V+ or V−, allowing use in AC-coupled or rectifier-style current-source configurations
Low minimum operating voltage	Starts regulating at 0.8 V (for I_set ≤ 100 µA), supporting ultra-low-power battery monitoring
High output impedance	Exceeds 10 MΩ at DC, ensuring near-ideal current source behavior across varying load impedances

Applications

Remote Temperature Sensor

Precision Bias Current Source

Use Scenario: Measuring temperature in harsh or distant locations (e.g., motor windings, HVAC ducts) using twisted-pair wiring up to 100 m.

IC Role / Device Role / Timing Role: Two-wire current transmitter; outputs 1 µA/K (e.g., 298 µA at 25°C), immune to lead resistance and EMI.

Use Value: Eliminates cold-junction compensation and achieves ±0.5°C accuracy over 0–70°C with only one external resistor and no trimming.

Use Scenario: Providing stable bias current to op-amp input stages, JFET amplifiers, or LED drivers in portable instrumentation.

IC Role / Device Role / Timing Role: Adjustable active load and bias generator; replaces fixed-current diodes or discrete transistor circuits.

Use Value: Delivers 1–10 mA with <0.03%/V line regulation, reducing drift-induced offset in precision analog front-ends.

Low-Voltage Reference Driver

In-Line Current Limiter

Use Scenario: Driving low-dropout voltage references (e.g., TL431, REF30xx) from 1.8 V or 3.3 V rails where headroom is limited.

IC Role / Device Role / Timing Role: Precision current source feeding reference IC's cathode; sets reference output voltage via external resistor divider.

Use Value: Enables stable 2.048 V or 2.5 V reference generation down to 1.0 V supply, extending usable range of LDO-based reference designs.

Use Scenario: Protecting microcontroller GPIO pins or sensor inputs from overcurrent during fault conditions (e.g., shorted thermistor leads).

IC Role / Device Role / Timing Role: Self-resetting current limiter placed in series with sensitive circuit nodes; limits fault current to safe, known value.

Use Value: Limits peak current to ≤10 mA independent of supply voltage, preventing latch-up or damage without requiring reset logic or fuses.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM334Z	TO-92 package; same electrical specs but higher thermal resistance (R_θJA ≈ 200°C/W vs. SO-8's 160°C/W); wider lead spacing	Preferred for prototyping, through-hole boards, or cost-sensitive low-volume production; less suitable for high-density SMT	Select LM334Z when manual assembly or socketing is required; verify thermal derating above 1 mA in still air
REF200	Two matched 100 µA current sources in SO-8; fixed output (no external resistor); ±0.5% initial accuracy; lower tempco (±50 ppm/°C)	Used where dual, highly matched, ultra-stable currents are needed (e.g., differential sensor excitation), not programmability	Choose REF200 for matched dual-current applications; LM334DT remains preferred for single, wide-range, resistor-programmed current

Compared with LM334Z and REF200, the LM334DT offers unique programmability across five decades of current with Kelvin temperature tracking - making it optimal for calibrated remote sensing and variable-bias designs where SO-8 thermal and assembly performance is critical.

Availability

LM334DT is available at Aetrix Electronics and suitable for remote temperature sensing, precision analog biasing, low-voltage reference driving, and in-line current limiting requiring stable component supply across industrial, test equipment, and embedded sensor platforms.

Supply support for LM334DT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The LM334DT belongs to ST's precision analog current source product line, engineered specifically for applications demanding Kelvin-proportional current output, wide supply range operation, and minimal external component count in sensor interface and bias circuitry.

FAQ

What is the minimum voltage required for the LM334DT to regulate current?

The LM334DT requires a minimum V+–V− voltage of 0.8 V when set for I_set ≤ 100 µA, rising to 1.0 V for I_set ≥ 1 mA. This headroom supports operation from 1.8 V logic rails and low-voltage battery systems, provided the external resistor and load do not exceed the compliance limit.

Can the LM334DT be used as a temperature sensor without calibration?

Yes - its output current is inherently proportional to absolute temperature (I_set ∝ T_K), with typical slope error <1% after single-point gain trim at 25°C. No offset calibration is needed because the extrapolated zero occurs at 0 K, simplifying factory setup and field recalibration.

How does lead resistance affect LM334DT accuracy?

Lead resistance between ADJ and R_set introduces error because the sense voltage is only ~64 mV. A 0.7 Ω contact resistance causes 1% error at 1 mA. To maintain accuracy, mount R_set directly adjacent to the ADJ and V− pins and avoid sockets or long PCB traces.

Is the LM334DT RoHS-compliant and halogen-free?

Yes - the LM334DT is supplied in an ECOPACK®-compliant SO-8 package with lead-free second-level interconnect and meets RoHS Directive 2011/65/EU. Halogen content is below IEC 61249-2-21 thresholds, verified per ST's material declarations and JEDEC JESD97 marking.

LM334DT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Current Source

Sensing Method:: -

Accuracy:: ±3%

Voltage - Input:: 1V ~ 40V

Current - Output:: 10mA

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

LM334DT FAQ

1.How can I place an order for LM334DT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM334DT 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 LM334DT reliable?

The price and inventory of LM334DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM334DT is usually 5 days.

3.What payment methods are accepted for LM334DT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM334DT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM334DT?

LM334DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM334DT 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 LM334DT?

For technical support, including LM334DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM334DT requirements.

6.How does Aetrix verify that LM334DT is sourced from the original manufacturer or authorized distributors?

All LM334DT 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 LM334DT meets industry standards.

7.What is the process for return or replacement of LM334DT?

All LM334DT units undergo pre-shipment inspection (PSI). If there is an issue with LM334DT, 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 LM334DT part is unused and in its original packaging.

Return procedure for LM334DT:

1.Submit a request within 90 days.

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

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