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

STMicroelectronics LM4040DELT-5.0

Name: LM4040DELT-5.0
Brand: STMicroelectronics
SKU: LM4040DELT-5.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040DELT-5.0

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: LM4040DELT-5.0.pdf

Description:: IC VREF SHUNT 5V SC70

Quantity:: RFQ Add To RFQ list

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Inventory:1,421

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Product details

Overview

LM4040DELT-5.0 from STMicroelectronics is a precision 5.0 V shunt voltage reference in SOT23-3L package, delivering ±1% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, and ultra-low 10 µA operating current. It enables stable voltage regulation in space-constrained, battery-powered instrumentation and data acquisition systems.

For engineers reviewing the LM4040DELT-5.0 datasheet, LM4040DELT-5.0 pinout, LM4040DELT-5.0 application, or LM4040DELT-5.0 equivalent, key selection criteria include shunt reference stability under capacitive loads, low-frequency noise (10 µV_p-p), thermal hysteresis (120 ppm), and compatibility with industrial temperature range (–40 to +125 °C).

Technical Context

The LM4040DELT-5.0 operates as a two-terminal shunt reference, sinking current through its cathode to maintain a precise 5.0 V reverse breakdown voltage across its terminals. Its bandgap-based core achieves high stability without requiring external biasing circuitry beyond a series resistor.

It exhibits very low dynamic impedance (0.15–0.3 Ω) and remains stable with capacitive loads up to 1 µF, eliminating need for output isolation capacitors in most applications. The device's 10 µA minimum operating current and 15 mA absolute maximum rating define its usable current window for regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V nominal; ±1% tolerance at 25 °C ensures reliable ADC reference or sensor excitation in cost-sensitive designs.
Temp Coefficient	≤70 ppm/°C over –40 to +125 °C; limits voltage drift to ±0.35% across full industrial range.
Operating Current	10 µA min / 15 mA max; enables micropower operation while supporting moderate load regulation.
Low-Freq Noise	10 µV_p-p (0.1–10 Hz); critical for high-resolution analog measurements where reference noise directly impacts SNR.
Thermal Hysteresis	120 ppm; quantifies voltage shift after thermal cycling-key for repeatable calibration in field-deployed equipment.
Dynamic Impedance	0.15–0.3 Ω; ensures minimal output voltage perturbation during transient load changes.
Stable Capacitance	Up to 1 µF; allows direct connection to ADC input caps or filtering networks without oscillation risk.

Pinout & Package

SOT23-3L package: compact 2.9 mm × 2.6 mm surface-mount outline with 0.95 mm lead pitch; optimized for high-density PCB layouts in portable and embedded systems.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Reference Output / Current Sink	Connected to regulated node; sinks all operating current to maintain 5.0 V across external load/resistor.
2 (Anode)	Ground Reference	Common return path; must be low-impedance to avoid ground bounce-induced error.
3 (NC)	No Connect	Internally unconnected; must remain floating or tied to anode per datasheet guidance to prevent parametric shift.

Key Features

Feature	Design Value
Ultra-low quiescent current	10 µA typical at 25 °C enables >10-year battery life in always-on sensor nodes.
Capacitive load stability	Stable with up to 1 µF output capacitance eliminates need for external isolation components.
Industrial temperature range	–40 to +125 °C operation supports deployment in automotive engine bays and industrial control cabinets.
Low LF noise performance	10 µV_p-p (0.1–10 Hz) minimizes quantization uncertainty in 16-bit+ data acquisition systems.
High precision grading	D-grade (±1%) offers optimal balance of accuracy and cost for non-critical reference applications.

Applications

Portable Medical Sensors

Data Acquisition Front-Ends

Use Scenario: Battery-powered glucose meters and pulse oximeters requiring stable excitation and ADC reference over multi-year shelf life.

IC Role / Device Role / Timing Role: Shunt voltage reference providing 5.0 V reference for analog front-end amplifiers and 12–16-bit SAR ADCs.

Use Value: 10 µA operating current extends coin-cell battery life beyond 5 years; ±1% accuracy meets ISO 15197 clinical tolerance requirements.

Use Scenario: Modular DAQ modules used in factory floor test benches with varying ambient temperatures.

IC Role / Device Role / Timing Role: Precision shunt reference for multiplexed sensor signal conditioning chains feeding simultaneous-sampling ADCs.

Use Value: 70 ppm/°C tempco ensures <±0.25% reference drift across –20 to +70 °C operating range, preserving measurement traceability.

Industrial Process Transmitters

Smart Energy Meters

Use Scenario: 4–20 mA loop-powered pressure/temperature transmitters installed in chemical plants with wide ambient swings.

IC Role / Device Role / Timing Role: Primary voltage reference for microcontroller-based signal processing and DAC output scaling.

Use Value: Stable operation up to +125 °C junction temperature enables direct PCB mounting near heat-generating sensors without derating.

Use Scenario: DIN-rail mounted electricity meters requiring long-term metrological stability and low self-heating.

IC Role / Device Role / Timing Role: Reference source for energy measurement ICs (e.g., ADE78xx) and isolated communication interfaces.

Use Value: 120 ppm thermal hysteresis prevents calibration drift after repeated power cycles and seasonal temperature exposure.

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 setpoint), ±0.5% initial accuracy, 100 ppm/°C tempco, 80 µA min current.	Requires external resistor divider; higher current draw increases self-heating error in sealed enclosures.	Select when adjustable output or tighter initial accuracy is required; verify thermal design due to higher I_min.
MAX6008AEUR+T	Fixed 5.0 V, ±0.2% accuracy, 20 ppm/°C tempco, 35 µA min current, SC70-3 package.	Higher accuracy and lower tempco but consumes >3× more current; SC70 footprint differs from SOT23-3L.	Choose for metrology-grade stability where power budget allows; requires PCB layout revision for SC70 pad geometry.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040DELT-5.0 trades initial accuracy and tempco for lowest operating current and drop-in SOT23-3L compatibility-making it optimal for ultra-low-power, cost-sensitive industrial endpoints where ±1% reference tolerance is acceptable.

Availability

LM4040DELT-5.0 is available at Aetrix Electronics and suitable for portable medical sensors, industrial process transmitters, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for LM4040DELT-5.0 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, microcontroller, power, and sensing solutions for industrial, automotive, and consumer markets.

The LM4040 series belongs to ST's precision analog portfolio, engineered specifically for low-power, high-stability shunt reference applications in harsh environments where size, temperature resilience, and long-term reliability are critical.

FAQ

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

At –40 °C, the LM4040DELT-5.0 requires 25 µA minimum cathode current to maintain regulation, per Table 3 of DS13886 Rev 4. This is higher than the 10 µA specified at 25 °C due to increased bandgap voltage curvature at cold temperatures.

Can the NC pin be grounded or left floating?

The NC pin (Pin 3) must be left unconnected or tied to the anode (Pin 2); grounding it may cause unpredictable shifts in output voltage or increased temperature coefficient, as confirmed in Figure 1 and associated note on page 2 of the datasheet.

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

Stability is maintained up to 1 µF output capacitance, as shown in Figure 11 (Stability plane vs. C_OUT). Exceeding this risks oscillation due to phase margin degradation; no external compensation is needed within this limit.

Is the LM4040DELT-5.0 RoHS-compliant and halogen-free?

Yes-the LM4040DELT-5.0 uses ST's ECOPACK2-compliant packaging, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21, as documented in Section 5 of DS13886 Rev 4.

LM4040DELT-5.0 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):: 5V

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-5.0 FAQ

1.How can I place an order for LM4040DELT-5.0 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040DELT-5.0 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-5.0 reliable?

The price and inventory of LM4040DELT-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DELT-5.0 is usually 5 days.

3.What payment methods are accepted for LM4040DELT-5.0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DELT-5.0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040DELT-5.0?

LM4040DELT-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040DELT-5.0 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-5.0?

For technical support, including LM4040DELT-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DELT-5.0 requirements.

6.How does Aetrix verify that LM4040DELT-5.0 is sourced from the original manufacturer or authorized distributors?

All LM4040DELT-5.0 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-5.0 meets industry standards.

7.What is the process for return or replacement of LM4040DELT-5.0?

All LM4040DELT-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DELT-5.0, 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-5.0 part is unused and in its original packaging.

Return procedure for LM4040DELT-5.0:

1.Submit a request within 90 days.

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

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