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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

STMicroelectronics LM4040DELT-3.0

Name: LM4040DELT-3.0
Brand: STMicroelectronics
SKU: LM4040DELT-3.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040DELT-3.0

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: LM4040DELT-3.0.pdf

Description:: IC VREF SHUNT 3V SC70

Quantity:: RFQ Add To RFQ list

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Inventory:1,331

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Product details

Overview

LM4040DELT-3.0 from STMicroelectronics is a 3.0 V, 1% initial accuracy, micropower shunt voltage reference in SOT23-3L package, operating from -40 °C to +125 °C with 70 ppm/°C max temperature coefficient and 10 µV_p-p low-frequency noise. It delivers stable regulation at ultra-low 10 µA operating current and supports capacitive loads up to 1 µF - ideal for precision ADC biasing in portable data loggers.

For engineers reviewing the LM4040DELT-3.0 datasheet, LM4040DELT-3.0 pinout, LM4040DELT-3.0 application, or LM4040DELT-3.0 equivalent, key selection criteria include its 3.0 V output tolerance, SOT23-3L footprint compatibility, industrial temperature stability, and minimal quiescent current - critical for battery-powered sensor nodes and low-power instrumentation.

Technical Context

The LM4040DELT-3.0 functions as a two-terminal shunt reference, sinking current through its cathode to maintain a precise 3.0 V across its terminals. Its internal bandgap core achieves ±1% initial accuracy (D-grade) and 70 ppm/°C max tempco over -40 °C to +125 °C, with thermal hysteresis limited to 120 ppm.

It exhibits ultra-low dynamic impedance (0.15–0.3 Ω), wideband noise of 95 µV_RMS, and stable operation with load capacitance up to 1 µF - verified via stability plane analysis in DS13886 Rev 4. No external compensation is required.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.0 V nominal, ±1% initial accuracy at 25 °C - ensures predictable ADC reference error budget in 12-bit systems.
Operating Current	10 µA minimum, 15 mA maximum - enables operation from high-impedance bias networks in energy-harvesting designs.
Tempco	≤70 ppm/°C - limits drift to ±0.84 mV over full -40 °C to +125 °C range, supporting industrial-grade measurement repeatability.
Low-Frequency Noise	10 µV_p-p (0.1–10 Hz) - minimizes voltage reference-induced noise in high-resolution sigma-delta ADCs.
Dynamic Impedance	0.15–0.3 Ω - maintains output stability under fast load transients, e.g., during successive-approximation ADC sampling bursts.
Thermal Hysteresis	120 ppm - guarantees repeatable voltage after thermal cycling, critical for field-deployed calibration equipment.
Capacitive Load Stability	Stable with up to 1 µF - allows direct decoupling without series resistance, simplifying PCB layout in space-constrained modules.

Pinout & Package

SOT23-3L package: 3-pin surface-mount, 2.9 mm × 2.6 mm × 1.1 mm body, ECOPACK® compliant, rated for 210 °C/W junction-to-ambient thermal resistance.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Reference output node	Connected to system ground via current-setting resistor; sinks all operating current to regulate 3.0 V at anode.
Anode (Pin 2)	Reference voltage terminal	Provides stable 3.0 V output; must be connected to load and bypass capacitor - no internal connection to ground.
NC (Pin 3)	No-connect terminal	Internally unconnected; must remain floating or tied to anode per DS13886 - not usable as thermal pad or auxiliary function.

Key Features

Feature	Design Value
Ultra-low operating current	10 µA min - extends battery life in coin-cell-powered IoT sensors beyond 10 years at 1-sample-per-minute duty cycle.
Capacitive-load stability	Validated stable with 0–1 µF output capacitance - eliminates need for isolation resistors in compact medical sensor front-ends.
Industrial temperature range	-40 °C to +125 °C operation - enables deployment in automotive engine control units and outdoor environmental monitors.
Low LF noise performance	10 µV_p-p (0.1–10 Hz) - reduces effective number of bits (ENOB) degradation in 24-bit delta-sigma ADCs by ≤0.3 bits.
High precision grading	D-grade (±1%) with 70 ppm/°C tempco - balances cost and performance for factory-calibrated test equipment where ±3 mV total error is acceptable.

Applications

Portable Data Acquisition

Industrial Sensor Transmitters

Use Scenario: Battery-powered handheld multimeter with 16-bit SAR ADC and auto-ranging front-end.

IC Role / Device Role / Timing Role: Shunt reference providing stable 3.0 V excitation and ADC reference for ratiometric measurements.

Use Value: 10 µA quiescent current enables >5-year battery life; ±1% accuracy meets Class II metering standards without periodic recalibration.

Use Scenario: 4–20 mA loop-powered pressure transmitter operating in oil-field wellheads (-40 °C to +85 °C).

IC Role / Device Role / Timing Role: Precision voltage reference for DAC-based current loop control and sensor signal conditioning.

Use Value: 70 ppm/°C tempco ensures <±0.25% full-scale error over ambient range; SOT23-3L footprint fits within 12 mm² PCB area budget.

Medical Wearable Monitors

Automotive Cabin Sensors

Use Scenario: ECG patch with ultra-low-power analog front-end and Bluetooth LE radio.

IC Role / Device Role / Timing Role: Reference source for instrumentation amplifier gain setting and ADC reference in single-supply 3.3 V system.

Use Value: 10 µV_p-p low-frequency noise prevents baseline wander artifacts; stable regulation at 10 µA supports sleep-mode operation.

Use Scenario: Occupancy detection module using IR proximity sensing and microcontroller with integrated ADC.

IC Role / Device Role / Timing Role: Voltage reference for analog comparator threshold generation and ADC calibration in AEC-Q200-compliant design.

Use Value: -40 °C to +125 °C rating satisfies under-hood temperature requirements; 1% accuracy ensures consistent trigger thresholds across vehicle lifetime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431ACDBVR	Adjustable (2.5 V min), 0.5% initial accuracy, 30 ppm/°C tempco, 80 µA min cathode current	Requires external resistor divider; higher current demand limits use in sub-10 µA systems	Select when adjustable output or tighter tempco is needed, and board space permits 3-resistor network.
MAX6008AEUR+T	Fixed 3.0 V, 0.2% initial accuracy, 50 ppm/°C tempco, SOT23-3 package, 65 µA typical supply current	Higher quiescent current; superior accuracy/tempco but incompatible with µA-level power budgets	Choose for metrology-grade instruments where 0.2% accuracy outweighs 6.5× higher current draw.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040DELT-3.0 uniquely balances ultra-low 10 µA operation, SOT23-3L footprint, and industrial temperature capability - making it optimal for space- and power-constrained embedded systems where ±1% tolerance is sufficient.

Availability

LM4040DELT-3.0 is available at Aetrix Electronics and suitable for portable data acquisition, industrial sensor transmitters, and medical wearable monitors requiring stable component supply with guaranteed long-term continuity.

Supply support for LM4040DELT-3.0 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM4040 belongs to ST's precision analog voltage reference product line, engineered specifically for low-power, high-stability applications in harsh environments - emphasizing micropower operation, wide temperature range, and robust capacitive-load immunity.

FAQ

What is the minimum cathode current required for regulation at -40 °C?

Per DS13886 Rev 4 Table 3, the LM4040DELT-3.0 requires 25 µA minimum cathode current (Ikmin) at -40 °C to maintain regulation. This increases from the 15 µA specified at 25 °C due to reduced bandgap core efficiency at low temperatures - design must ensure current-setting resistor delivers ≥25 µA across full temperature range.

Can the NC pin (Pin 3) be used as a thermal pad or grounded for improved thermal performance?

No. Pin 3 is internally unconnected (NC) and must remain floating or be tied to the anode per Figure 1 and datasheet note. Connecting it to PCB ground or thermal copper violates the SOT23-3L mechanical specification and may cause parametric shift or reliability risk - thermal dissipation relies solely on anode/cathode conduction paths.

How does load capacitance affect stability, and what is the maximum safe value?

DS13886 Figure 11 confirms stable operation up to 1 µF output capacitance with no series resistance required. Beyond 1 µF, phase margin degrades - observed oscillation onset occurs near 1.2 µF in typical layouts. For >1 µF applications, add a 1–5 Ω damping resistor in series with the capacitor to restore stability.

Is the LM4040DELT-3.0 qualified for automotive applications per AEC-Q200?

No. While the LM4040DELT-3.0 operates across -40 °C to +125 °C, it is not AEC-Q200 stress-tested or certified. ST offers the automotive-grade LM4040Q series (e.g., LM4040QCEM3-3.0) with full AEC-Q200 qualification, enhanced ESD robustness (4 kV HBM), and extended reliability testing - required for under-hood or safety-critical automotive use.

LM4040DELT-3.0 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: SC-70, SOT-323

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 3V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 70ppm/°C

Noise - 0.1Hz to 10Hz:: 10µVp-p

Noise - 10Hz to 10kHz:: 95µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 25 µA

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323-3

LM4040DELT-3.0 FAQ

1.How can I place an order for LM4040DELT-3.0 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040DELT-3.0 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 LM4040DELT-3.0 reliable?

The price and inventory of LM4040DELT-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DELT-3.0 is usually 5 days.

3.What payment methods are accepted for LM4040DELT-3.0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DELT-3.0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040DELT-3.0?

LM4040DELT-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040DELT-3.0 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 LM4040DELT-3.0?

For technical support, including LM4040DELT-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DELT-3.0 requirements.

6.How does Aetrix verify that LM4040DELT-3.0 is sourced from the original manufacturer or authorized distributors?

All LM4040DELT-3.0 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 LM4040DELT-3.0 meets industry standards.

7.What is the process for return or replacement of LM4040DELT-3.0?

All LM4040DELT-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DELT-3.0, 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 LM4040DELT-3.0 part is unused and in its original packaging.

Return procedure for LM4040DELT-3.0:

1.Submit a request within 90 days.

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

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