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

STMicroelectronics LM4040CELT-2.0

Name: LM4040CELT-2.0
Brand: STMicroelectronics
SKU: LM4040CELT-2.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040CELT-2.0

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: LM4040CELT-2.0.pdf

Description:: IC VREF SHUNT 2.048V SC70

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM4040CELT-2.0 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 2.048 V output with ±0.5% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, ultra-low 10 µA operating current, and 10 µV_p-p low-frequency noise. It operates across –40 to +125 °C and is used in high-resolution ADC biasing and portable sensor signal conditioning.

For engineers reviewing the LM4040CELT-2.0 datasheet, LM4040CELT-2.0 pinout, LM4040CELT-2.0 application, or LM4040CELT-2.0 equivalent, key selection criteria include shunt reference stability under capacitive loads, thermal hysteresis (120 ppm), dynamic impedance (0.15–0.3 Ω), and SOT23-3L footprint compatibility in space-constrained industrial sensing designs.

Technical Context

The LM4040CELT-2.0 functions as a two-terminal shunt reference, sinking current to maintain a precise 2.048 V cathode-to-anode voltage. Its bandgap-based core achieves ±0.5% tolerance at 25 °C and maintains regulation down to 10 µA minimum operating current, enabling use in ultra-low-power systems.

It exhibits stable operation with capacitive loads up to 1 µF (per Figure 11), features 95 µV_RMS wideband noise (10 Hz–10 kHz), and delivers 0.2–4 mV total voltage shift over full operating current range (10 µA–15 mA) and temperature (–40 to +125 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.048 V ±0.5% at 25 °C - enables direct interface with 12-bit ADCs requiring 2.048 V full-scale reference.
Initial Accuracy	±0.5% (LM4040C grade) - supports calibration-free designs in portable instrumentation.
Temp Coefficient	≤70 ppm/°C - ensures <±0.85 mV drift over –40 to +125 °C, critical for automotive cabin sensors.
Operating Current	10 µA min / 15 mA max - allows battery life extension in coin-cell-powered IoT nodes.
Low-Freq Noise	10 µV_p-p (0.1–10 Hz) - preserves SNR in precision weigh-scale front-ends.
Dynamic Impedance	0.15–0.3 Ω - minimizes load-induced voltage error in varying-current data acquisition circuits.
Thermal Hysteresis	120 ppm - guarantees repeatable voltage after thermal cycling in industrial control modules.

Pinout & Package

SOT23-3L package: 2.9 mm × 1.3 mm × 1.0 mm body, 0.95 mm lead pitch, RoHS-compliant ECOPACK2, rated for 210 °C/W junction-to-ambient thermal resistance.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Reference Output Node	Connected to load's reference input; sinks current to regulate 2.048 V relative to anode.
2 (Anode)	Ground Reference Terminal	Bias return path; must be tied to system ground or low-impedance analog ground plane.
3 (NC)	No Connect	Internally unconnected; must remain floating or tied to anode per datasheet guidance (DS13886 p.2).

Key Features

Feature	Design Value
Capacitive Load Stability	Stable with up to 1 µF output capacitance - eliminates need for external isolation resistors in noisy power rail environments.
Micropower Operation	10 µA minimum operating current - enables continuous reference bias in energy-harvesting sensor nodes.
Industrial Temp Range	–40 to +125 °C operation - qualified for under-hood automotive and factory-floor PLC applications.
Low Thermal Hysteresis	120 ppm voltage shift after thermal cycling - ensures measurement repeatability in cyclic thermal environments.
ESD Robustness	2 kV HBM rating - withstands handling and board-level ESD events without parameter shift.

Applications

Portable Medical Sensors

Data Acquisition Front-Ends

Use Scenario: Continuous glucose monitor (CGM) analog front-end requiring stable excitation voltage for electrochemical transduction.

IC Role / Device Role / Timing Role: Shunt reference providing 2.048 V bias to op-amp gain stage and SAR ADC reference input.

Use Value: ±0.5% accuracy and 10 µV_p-p noise ensure sub-1% measurement error and >100 dB SNR in microamp-level current sensing.

Use Scenario: 16-bit isolated data logger capturing vibration and temperature in predictive maintenance gateways.

IC Role / Device Role / Timing Role: Precision voltage reference for sigma-delta ADC reference buffer and sensor excitation circuitry.

Use Value: 70 ppm/°C tempco and 120 ppm hysteresis enable <±2 LSB drift over full industrial temperature range.

Smart Energy Meters

Automotive Cabin Sensors

Use Scenario: Revenue-grade electricity meter using shunt-based current sensing with metrology-grade ADC.

IC Role / Device Role / Timing Role: Primary reference source for 24-bit delta-sigma ADC measuring voltage and current channels.

Use Value: 0.15 Ω dynamic impedance prevents loading error during fast transient current sampling events.

Use Scenario: Occupancy detection module with IR thermopile and ambient light sensor in automotive HVAC control unit.

IC Role / Device Role / Timing Role: Stable bias reference for dual-channel signal conditioning and ratiometric ADC conversion.

Use Value: Stable regulation at 10 µA enables always-on wake-up capability while meeting ISO 16750-4 cold-cranking voltage requirements.

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), 1% initial accuracy, 100 ppm/°C tempco, 80 µA min current	Requires external resistor divider; higher current draw limits ultra-low-power use	Select when adjustable output or higher output voltage (>2.5 V) is required; not drop-in for fixed 2.048 V.
MAX6008AEUR+T	Fixed 2.048 V, ±0.2% accuracy, 30 ppm/°C tempco, 35 µA min current, SC70-3 package	Tighter accuracy and lower tempco, but higher quiescent current and different footprint	Choose for higher precision where 25 µA minimum current is acceptable and SC70 layout is feasible.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040CELT-2.0 uniquely balances ultra-low 10 µA operation, SOT23-3L compatibility, and ±0.5% accuracy-making it optimal for space- and power-constrained industrial sensor nodes where fixed 2.048 V is mandated.

Availability

LM4040CELT-2.0 is available at Aetrix Electronics and suitable for portable medical sensors, smart energy meters, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040CELT-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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM4040 series belongs to ST's precision analog portfolio, engineered specifically for high-accuracy, low-power shunt reference applications in harsh-environment instrumentation and battery-operated measurement systems.

FAQ

What is the minimum operating current for LM4040CELT-2.0 at –40 °C?

At –40 °C, the minimum operating current is 12 µA (per Table 3, DS13886 Rev 4). This ensures reliable regulation across the full industrial temperature range, unlike room-temperature-only specs that omit cold-start behavior.

Can LM4040CELT-2.0 drive a 100 nF capacitive load without oscillation?

Yes - Figure 9 confirms stable turn-on behavior with C_LOAD = 100 nF, and Figure 11 defines the stable region up to 1 µF at ≥10 µA. No series resistor is needed, simplifying PCB layout in noise-sensitive signal chains.

Is the NC pin on SOT23-3L required to be left floating?

No - the NC pin (Pin 3) may be left unconnected or tied to the anode (Pin 2), as explicitly stated in the datasheet (DS13886 p.2). Connecting it to anode does not affect performance and can improve mechanical stability in automated assembly.

How does thermal hysteresis impact calibration in field-deployed equipment?

Thermal hysteresis of 120 ppm means voltage may shift by up to ±0.25 mV after cycling between –40 °C and +125 °C. For systems requiring recalibration only at factory, this is negligible; for field-trimmed devices, it sets the lower bound on achievable long-term repeatability.

LM4040CELT-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:: ±0.5%

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

LM4040CELT-2.0 FAQ

1.How can I place an order for LM4040CELT-2.0 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040CELT-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 LM4040CELT-2.0 reliable?

The price and inventory of LM4040CELT-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 LM4040CELT-2.0 is usually 5 days.

3.What payment methods are accepted for LM4040CELT-2.0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CELT-2.0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040CELT-2.0?

LM4040CELT-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040CELT-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 LM4040CELT-2.0?

For technical support, including LM4040CELT-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CELT-2.0 requirements.

6.How does Aetrix verify that LM4040CELT-2.0 is sourced from the original manufacturer or authorized distributors?

All LM4040CELT-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 LM4040CELT-2.0 meets industry standards.

7.What is the process for return or replacement of LM4040CELT-2.0?

All LM4040CELT-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CELT-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 LM4040CELT-2.0 part is unused and in its original packaging.

Return procedure for LM4040CELT-2.0:

1.Submit a request within 90 days.

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

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