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

STMicroelectronics LM4040DELT-2.0

Name: LM4040DELT-2.0
Brand: STMicroelectronics
SKU: LM4040DELT-2.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040DELT-2.0

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: LM4040DELT-2.0.pdf

Description:: IC VREF SHUNT 2.048V SC70

Quantity:: RFQ Add To RFQ list

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Inventory:1,464

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Product details

Overview

LM4040DELT-2.0 from STMicroelectronics is a precision micropower shunt voltage reference delivering a fixed 2.048 V output with ±1% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, and ultra-low 10 µA operating current - enabling stable voltage regulation in space-constrained, battery-powered instrumentation and data acquisition systems.

For engineers reviewing the LM4040DELT-2.0 datasheet, LM4040DELT-2.0 pinout, LM4040DELT-2.0 application, or LM4040DELT-2.0 equivalent, key selection criteria include shunt reference stability under capacitive loads, low-frequency noise (10 µV_p-p), thermal hysteresis (120 ppm), minimum regulation current (12 µA over -40 to +125 °C), and SOT23-3L package compatibility with high-density PCB layouts.

Technical Context

The LM4040DELT-2.0 operates as a two-terminal shunt reference, sinking current through its cathode to maintain a precise 2.048 V across external load/resistor networks. Its bandgap-based core achieves 70 ppm/°C tempco and 120 ppm thermal hysteresis without requiring external compensation.

It functions reliably with capacitive loads up to 1 µF (per stability plane analysis), exhibits 0.15–0.3 Ω static impedance (ΔI_k = 10 µA to 10 mA), and delivers 10 µV_p-p low-frequency noise (0.1–10 Hz) - critical for high-resolution ADC biasing and sensor excitation circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.048 V nominal; ±1% tolerance at 25 °C ensures predictable ADC reference scaling in portable measurement devices.
Initial Accuracy	±1% (LM4040D grade); guarantees worst-case voltage deviation within ±20.5 mV at room temperature for production calibration.
Tempco	≤70 ppm/°C; limits drift to ±8.8 mV over full -40 to +125 °C range - suitable for industrial-grade sensor signal chains.
Operating Current	10 µA typical at 25 °C; enables >10-year battery life in always-on IoT sensors drawing <15 µA quiescent current.
Low-Freq Noise	10 µV_p-p (0.1–10 Hz); preserves ENOB in 16-bit+ SAR ADCs by minimizing reference-induced quantization uncertainty.
Min Regulation Current	12 µA over full temperature range; defines lowest bias current needed to sustain regulation in cold-weather deployments.
Static Impedance	0.15–0.3 Ω; maintains output stability against dynamic load transients in multiplexed analog front-ends.

Pinout & Package

SOT23-3L surface-mount package (3-pin, 2.9 mm × 2.6 mm footprint) with exposed pad not connected; optimized for thermal performance (R_thJA = 210 °C/W) and high-density layout.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Reference output node	Connected to system ground via series resistor; sinks current to clamp voltage at 2.048 V - requires external current-limiting resistor.
Anode (Pin 2)	Ground reference terminal	Direct connection to PCB ground plane; establishes return path for shunt current and sets reference potential.
NC (Pin 3)	No-connect terminal	Must remain unconnected or tied to anode per datasheet; no internal function - avoids parasitic coupling in RF-sensitive designs.

Key Features

Feature	Design Value
Fixed 2.048 V output	Matches standard 12-bit DAC/ADC full-scale codes (2¹² = 4096), eliminating scaling errors in digital calibration systems.
10 µA ultra-low I_Q	Reduces power dissipation to <21 µW at 2.048 V - essential for coin-cell–powered handheld test equipment.
Stable with C_OUT ≤ 1 µF	Eliminates need for external compensation networks when buffering with ceramic decoupling caps in compact modules.
Industrial temp range	Guaranteed operation from -40 to +125 °C supports deployment in automotive engine control units and outdoor metering hardware.
70 ppm/°C max tempco	Ensures voltage error stays below ±0.43% over full temperature span - tighter than most 1% Zener diodes.

Applications

Portable Data Loggers

Medical Sensor Interfaces

Use Scenario: Battery-powered environmental monitors logging temperature/humidity every 5 seconds using 16-bit sigma-delta ADCs.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.048 V reference for ADC conversion and sensor excitation.

Use Value: 10 µV_p-p low-frequency noise prevents baseline drift in microvolt-level thermistor readings over multi-day deployments.

Use Scenario: Wearable ECG front-end with isolated analog signal chain and rechargeable Li-ion battery.

IC Role / Device Role / Timing Role: Precision bias reference for op-amp instrumentation amplifiers and ADC reference input.

Use Value: ±1% initial accuracy and 70 ppm/°C tempco ensure <0.5% total gain error across body-temperature variations (32–42 °C).

Smart Meter Analog Front-End

Industrial PLC Input Modules

Use Scenario: DIN-rail mounted electricity meter measuring RMS voltage/current with metrology-grade accuracy.

IC Role / Device Role / Timing Role: Primary reference for 24-bit delta-sigma ADCs digitizing AC line signals.

Use Value: 12 µA min regulation current enables reliable startup during brownout conditions where supply drops to 2.5 V.

Use Scenario: Modular I/O card converting 4–20 mA field signals to digital values in factory automation controllers.

IC Role / Device Role / Timing Role: Stable reference for programmable gain instrumentation amplifier and SAR ADC.

Use Value: SOT23-3L package allows placement directly adjacent to ADC input pins, minimizing noise pickup on reference traces.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431IDBVR	Adjustable (2.5 V min) 3-terminal shunt; 0.5% initial accuracy; 100 ppm/°C tempco; 80 µA I_Q.	Requires external resistors to set 2.048 V; higher noise (20 µV_p-p) and tempco reduce DC measurement fidelity.	Choose only if adjustable output or higher current drive (>100 mA) is required; not drop-in for fixed 2.048 V use.
MAX6008AEUR+T	Fixed 2.048 V; 0.1% initial accuracy; 30 ppm/°C tempco; 35 µA I_Q; SOT23-3 package.	Higher accuracy and lower tempco improve long-term calibration stability but increase quiescent power 3.5×.	Select when metrology-grade accuracy justifies added power cost - e.g., lab-grade calibrators or benchtop DMMs.

Compared with TLVH431IDBVR, LM4040DELT-2.0 offers lower noise and tighter tempco in a fixed-output configuration; versus MAX6008AEUR+T, it trades 0.9% accuracy and 40 ppm/°C for 75% lower operating current - optimizing for battery life over absolute precision.

Availability

LM4040DELT-2.0 is available at Aetrix Electronics and suitable for portable data loggers, medical sensor interfaces, and smart meter analog front-ends requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LM4040DELT-2.0 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 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 voltage referencing in space- and energy-constrained measurement systems.

FAQ

What is the minimum cathode current required for regulation across temperature?

The LM4040DELT-2.0 requires ≥12 µA cathode current to maintain regulation over its full -40 to +125 °C operating range, increasing from 10 µA at 25 °C. This value is validated per Table 3 of DS13886 Rev 4 and ensures stable 2.048 V output even during cold-start conditions in outdoor equipment.

Can LM4040DELT-2.0 drive capacitive loads without oscillation?

Yes - the device remains stable with output capacitance up to 1 µF, as confirmed by Figure 11 (Stability plane vs. C_OUT) in DS13886 Rev 4. No external compensation is needed when using standard 10 µF ceramic bypass capacitors commonly placed near ADC reference inputs.

How does the NC pin (Pin 3) affect PCB layout?

Pin 3 is a no-connect terminal that must either remain unconnected or be tied to the anode (Pin 2). Leaving it floating may introduce noise coupling; connecting it to anode improves thermal symmetry but adds no electrical function - both options are validated in SOT23-3L layout guidelines on page 8 of DS13886 Rev 4.

Is LM4040DELT-2.0 compatible with lead-free reflow profiles?

Yes - the SOT23-3L package supports JEDEC J-STD-020D-compliant lead-free reflow with peak solder temperature of 260 °C for 10 seconds (Table 1, DS13886 Rev 4), and is qualified per ST's ECOPACK2 environmental standard for RoHS and halogen-free compliance.

LM4040DELT-2.0 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):: 2.048V

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:: 12 mA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323-3

LM4040DELT-2.0 FAQ

1.How can I place an order for LM4040DELT-2.0 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040DELT-2.0 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-2.0 reliable?

The price and inventory of LM4040DELT-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DELT-2.0 is usually 5 days.

3.What payment methods are accepted for LM4040DELT-2.0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DELT-2.0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040DELT-2.0?

LM4040DELT-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040DELT-2.0 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-2.0?

For technical support, including LM4040DELT-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DELT-2.0 requirements.

6.How does Aetrix verify that LM4040DELT-2.0 is sourced from the original manufacturer or authorized distributors?

All LM4040DELT-2.0 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-2.0 meets industry standards.

7.What is the process for return or replacement of LM4040DELT-2.0?

All LM4040DELT-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DELT-2.0, 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-2.0 part is unused and in its original packaging.

Return procedure for LM4040DELT-2.0:

1.Submit a request within 90 days.

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

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