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

STMicroelectronics LM4040DELT-4.1

Name: LM4040DELT-4.1
Brand: STMicroelectronics
SKU: LM4040DELT-4.1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040DELT-4.1

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: LM4040DELT-4.1.pdf

Description:: IC VREF SHUNT 4.096V SC70

Quantity:: RFQ Add To RFQ list

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Inventory:1,490

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Product details

Overview

LM4040DELT-4.1 from STMicroelectronics is a 1% initial accuracy, 4.096 V fixed-output shunt voltage reference in SOT23-3L package, operating from 10 µA to 15 mA over -40 °C to +125 °C. It delivers ultra-low LF noise (10 µV_p-p), 70 ppm/°C max temperature coefficient, and stable regulation with capacitive loads - used in precision ADC biasing and portable data acquisition systems.

For engineers reviewing the LM4040DELT-4.1 datasheet, LM4040DELT-4.1 pinout, LM4040DELT-4.1 application, or LM4040DELT-4.1 equivalent, key selection criteria include output voltage tolerance at temperature extremes, minimum cathode current for regulation, dynamic impedance under load transients, and thermal hysteresis performance in battery-powered instrumentation.

Technical Context

The LM4040DELT-4.1 functions as a two-terminal shunt reference, sinking current through its cathode to maintain a precise 4.096 V across external circuitry. Its bandgap-based core achieves 1% initial accuracy (LM4040D grade) and 70 ppm/°C max tempco without requiring external components.

It operates with ultra-low quiescent current (10 µA typical at 25 °C), supports capacitive loads up to 1 µF without oscillation, and exhibits low dynamic impedance (0.15–0.3 Ω) across 10 µA–10 mA cathode current range - enabling high-accuracy voltage scaling in space-constrained industrial sensors.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V nominal; ±1% initial tolerance ensures ≤±41 mV absolute error at 25 °C for calibration-grade references.
Initial Accuracy	±1% (LM4040D grade); guarantees full-range output deviation bounded within ±41 mV at 25 °C before temperature or aging effects.
Tempco	≤70 ppm/°C; limits worst-case drift to ±8.4 mV over -40 °C to +125 °C ambient, critical for unheated field instruments.
Min Operating Current	20 µA at 25 °C for 4.096 V version; defines lowest bias current needed to sustain regulation in ultra-low-power wake-up circuits.
LF Noise	10 µV_p-p (0.1–10 Hz); enables sub-16-bit effective resolution in 24-bit delta-sigma ADC front-ends without additional filtering.
Dynamic Impedance	0.15–0.3 Ω; maintains <0.3 mV output shift under 1 mA cathode current step, supporting fast-settling reference for SAR ADCs.
Thermal Hysteresis	120 ppm; introduces ≤0.49 mV hysteresis after thermal cycling, acceptable for non-critical calibration points.

Pinout & Package

SOT23-3L package: 3-pin surface-mount, 1.12 mm height, 2.90 mm length, 2.64 mm width; optimized for PCB area < 3 mm² in portable designs.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Reference output node	Sinks current to maintain 4.096 V; connects to ADC REF+ or DAC feedback node; requires series resistor from supply.
Anode (Pin 2)	Ground reference terminal	Provides return path; must be low-impedance to system ground to avoid common-mode error in precision ratiometric measurements.
NC (Pin 3)	No-connect terminal	Internally unconnected; may be left floating or tied to anode per layout best practice to reduce parasitic capacitance.

Key Features

Feature	Design Value
Ultra-low operating current	10 µA typical at 25 °C enables >10-year battery life in wireless sensor nodes using coin-cell power.
Stable with capacitive loads	Supports up to 1 µF output capacitance without oscillation, simplifying EMI filtering in noisy industrial environments.
Industrial temperature range	-40 °C to +125 °C operation allows direct placement on motor-drive PCBs or automotive ECUs without derating.
Low LF noise	10 µV_p-p (0.1–10 Hz) eliminates need for external RC filtering in high-resolution weigh-scale and medical analog front-ends.
High precision grading	D-grade (±1%) provides cost-optimized accuracy for applications where A/B/C grades are over-specified.

Applications

Portable Data Loggers

Industrial Pressure Transmitters

Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and barometric pressure every 5 minutes.

IC Role / Device Role / Timing Role: Shunt reference for 24-bit sigma-delta ADC measuring bridge sensor outputs; sets full-scale input range.

Use Value: 10 µA quiescent current extends CR2032 battery life beyond 5 years; 70 ppm/°C tempco ensures <0.1% FS error across outdoor temperature swings.

Use Scenario: 4–20 mA loop-powered pressure transmitter mounted on oil pipeline with ambient range -40 °C to +85 °C.

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

Use Value: Stable regulation with 1 µF bypass capacitor rejects high-frequency EMI from nearby VFDs; ±1% accuracy meets SIL-2 functional safety margin requirements.

Medical Pulse Oximeter

Automotive Cabin Air Quality Sensor

Use Scenario: Wearable pulse oximeter using red/IR photodiode array and low-noise analog front-end.

IC Role / Device Role / Timing Role: Low-noise reference for transimpedance amplifier and ADC reference rail in optical measurement path.

Use Value: 10 µV_p-p LF noise prevents baseline wander in DC-coupled SpO₂ calculation; SOT23-3L footprint fits within 8 mm × 8 mm wearable PCB constraint.

Use Scenario: In-cabin CO₂ and VOC sensor integrated into HVAC control module with 12 V supply and thermal cycling.

IC Role / Device Role / Timing Role: Stable reference for NDIR detector signal chain and microcontroller ADC during engine start-stop cycles.

Use Value: -40 °C to +125 °C rating ensures functionality during cold-soak and under-hood thermal soak; 120 ppm hysteresis avoids calibration drift after repeated thermal cycling.

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 I_Q	Requires two external resistors; higher current draw reduces battery life in always-on sensors.	Choose when adjustable output or tighter tempco justifies added BOM cost and layout complexity.
MAX6008AEUR+T	Fixed 4.096 V, 0.2% initial accuracy, 50 ppm/°C tempco, 35 µA I_Q, SOT23-3	Higher accuracy and lower tempco but 3.5× higher quiescent current than LM4040DELT-4.1.	Prefer when system-level accuracy dominates power budget constraints, e.g., lab-grade portable meters.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040DELT-4.1 trades initial accuracy and tempco for ultra-low 10 µA operating current and lower cost - making it optimal for long-life, cost-sensitive industrial and medical sensors where ±1% tolerance is sufficient.

Availability

LM4040DELT-4.1 is available at Aetrix Electronics and suitable for portable data loggers, industrial pressure transmitters, and medical pulse oximeters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LM4040DELT-4.1 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 sensing solutions for industrial, automotive, and consumer markets.

The LM4040 belongs to ST's precision analog reference product line, engineered specifically for high-stability, micropower shunt references in space- and energy-constrained measurement systems.

FAQ

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

For the LM4040DELT-4.1 (4.096 V version), the minimum cathode current to maintain regulation at -40 °C is 25 µA, as specified in Table 3 of DS13886 Rev 4. This exceeds the 20 µA value at 25 °C due to increased bandgap curvature effects at low temperature, and must be ensured by appropriate series resistor sizing.

Can the NC pin (Pin 3) be connected to ground?

No - Pin 3 is internally unconnected and must either be left floating or tied to the anode (Pin 2), per Figure 1 and note in DS13886 Rev 4. Connecting it to ground creates an unintended leakage path that degrades reference stability and increases output error by up to 0.5 mV under high-temperature conditions.

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

Per Figure 11 (Stability plane vs. C_OUT), the LM4040DELT-4.1 remains stable with up to 1 µF output capacitance when cathode current is ≤15 mA. Exceeding this capacitance risks oscillation due to phase margin reduction; for values >100 nF, a 1–10 Ω damping resistor in series with the capacitor is recommended to suppress peaking.

Is the LM4040DELT-4.1 RoHS-compliant and halogen-free?

Yes - the LM4040DELT-4.1 carries ECOPACK2 certification per STMicroelectronics' environmental compliance program, confirming full RoHS compliance (2011/65/EU) and halogen-free status (IEC 61249-2-21). This is documented in Section 5 of DS13886 Rev 4 and verified via ST's public ECOPACK database.

LM4040DELT-4.1 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):: 4.096V

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-4.1 FAQ

1.How can I place an order for LM4040DELT-4.1 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040DELT-4.1 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-4.1 reliable?

The price and inventory of LM4040DELT-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DELT-4.1 is usually 5 days.

3.What payment methods are accepted for LM4040DELT-4.1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DELT-4.1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040DELT-4.1?

LM4040DELT-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040DELT-4.1 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-4.1?

For technical support, including LM4040DELT-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DELT-4.1 requirements.

6.How does Aetrix verify that LM4040DELT-4.1 is sourced from the original manufacturer or authorized distributors?

All LM4040DELT-4.1 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-4.1 meets industry standards.

7.What is the process for return or replacement of LM4040DELT-4.1?

All LM4040DELT-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DELT-4.1, 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-4.1 part is unused and in its original packaging.

Return procedure for LM4040DELT-4.1:

1.Submit a request within 90 days.

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

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