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

STMicroelectronics LM4040CECT-2.0

Name: LM4040CECT-2.0
Brand: STMicroelectronics
SKU: LM4040CECT-2.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040CECT-2.0

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: LM4040CECT-2.0.pdf

Description:: IC VREF SHUNT 2.048V 5TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,670

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Product details

Overview

LM4040CECT-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, and ultra-low 10 µA operating current. It operates across –40 to +125 °C and is optimized for space-constrained, battery-powered data acquisition and portable instrumentation.

For engineers reviewing the LM4040CECT-2.0 datasheet, LM4040CECT-2.0 pinout, LM4040CECT-2.0 application, or LM4040CECT-2.0 equivalent, key selection criteria include its SOT323-5L package footprint, low-frequency noise (10 µV_p-p), thermal hysteresis (120 ppm), dynamic impedance (0.15–0.3 Ω), and capacitive-load stability up to 1 µF.

Technical Context

The LM4040CECT-2.0 functions as a two-terminal shunt reference, sinking current through its cathode to maintain precise reverse breakdown voltage. Its bandgap-based core achieves high initial accuracy and low drift without requiring external bias components.

It exhibits stable regulation down to 10 µA minimum operating current and maintains low dynamic impedance (<0.3 Ω) across 10 µA–15 mA load range. The device remains stable with capacitive loads up to 1 µF, eliminating need for series isolation resistors in many sensor front-end and ADC reference designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.048 V nominal; ±0.5% tolerance at 25 °C ensures ≤10.24 mV absolute error in precision 12-bit DAC/ADC references.
Temp Coefficient	Max 70 ppm/°C; contributes ≤0.175 mV drift over full –40 to +125 °C range, critical for industrial-grade calibration.
Operating Current	10 µA typical; enables >10-year battery life in coin-cell-powered IoT sensors with 220 mAh capacity.
Low-Freq Noise	10 µV_p-p (0.1–10 Hz); avoids LSB errors in 16-bit+ SAR ADCs where reference noise dominates SNR.
Dynamic Impedance	0.15–0.3 Ω; minimizes load-induced voltage shift during fast-switching ADC sampling bursts.
Thermal Hysteresis	120 ppm; limits repeatable voltage error after thermal cycling-essential for field-deployed test equipment.
Capacitive Load Stability	Stable with up to 1 µF output capacitance; allows direct decoupling without destabilizing feedback loop.

Pinout & Package

SOT323-5L is a 5-pin ultra-miniature plastic surface-mount package (1.8 × 2.1 mm footprint) with exposed thermal pad; pins 1 (Cathode), 3 (Anode), and 4 (NC) are functional; pins 2 and 5 are NC and must remain unconnected or tied to anode per datasheet guidance.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Reference output node	Sinks regulated current; connects to ADC REF+ or op-amp inverting input in shunt configuration.
3 (Anode)	Current return path	Connects to system ground; forms closed current loop essential for shunt reference operation.
4 (NC)	No-connect terminal	Must be left floating or tied to anode; no internal connection-omitting this risks mechanical stress on bond wire.

Key Features

Feature	Design Value
Ultra-low quiescent current	10 µA enables continuous operation in energy-harvesting nodes where average power budget is <10 µW.
Fixed 2.048 V output	Matches common 12-bit full-scale ADC codes (2¹² = 4096), simplifying digital gain calibration and eliminating scaling firmware.
70 ppm/°C tempco	Meets Class I industrial specification (IEC 61000-6-2) for voltage reference stability in uncontrolled ambient environments.
10 µV_p-p LF noise	Supports effective resolution >16 bits in delta-sigma ADCs without external filtering or averaging overhead.
Capacitive-load tolerant	Eliminates need for series resistor + capacitor RC filter, reducing BOM count and PCB area in compact sensor modules.

Applications

Portable Gas Sensor Node

Industrial 4–20 mA Transmitter

Use Scenario: Battery-powered electrochemical gas detector with 16-bit sigma-delta ADC measuring ppm-level CO concentration.

IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048 V for ADC VREF, directly biased by low-current LDO output.

Use Value: 10 µA supply current extends 2× AA battery life to >5 years; 10 µV_p-p noise prevents false alarms from baseline drift.

Use Scenario: Loop-powered field transmitter converting RTD temperature to 4–20 mA signal in hazardous area.

IC Role / Device Role / Timing Role: Precision voltage reference for current-loop DAC and sensor excitation circuitry.

Use Value: 70 ppm/°C tempco ensures ≤0.25% span error over –40 to +85 °C ambient; SOT323-5L fits tight 2-layer PCB layout.

Medical ECG Front-End

Smart Electricity Meter Reference

Use Scenario: Ultra-low-power wearable ECG monitor sampling at 250 SPS with 16-bit resolution.

IC Role / Device Role / Timing Role: Reference source for instrumentation amplifier gain-setting and ADC conversion.

Use Value: Thermal hysteresis of 120 ppm prevents calibration drift after patient-worn thermal cycling; stable with 100 nF ceramic bypass.

Use Scenario: Revenue-grade electricity meter requiring metrology-grade voltage reference for 24-bit ADC.

IC Role / Device Role / Timing Role: Primary shunt reference for polyphase energy measurement ASIC reference rail.

Use Value: ±0.5% initial accuracy and 120 ppm hysteresis meet IEC 62053-21 Class 0.2 accuracy requirements without factory trim.

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% accuracy, 80 ppm/°C, 80 µA I_Q	Requires external resistor divider; higher current increases self-heating error in sealed enclosures.	Choose when adjustable output or higher voltage (>2.5 V) is required; avoid for fixed 2.048 V systems due to resistor tolerance stack-up.
MAX6008AEUR+T	Fixed 2.048 V, 0.1% accuracy, 30 ppm/°C, 35 µA I_Q, SOT23-3	Higher accuracy but 3.5× higher supply current; SOT23-3 lacks NC pin for grounding flexibility.	Choose for metrology-grade accuracy where power budget allows; SOT23-3 footprint incompatible with SOT323-5L board layout.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040CECT-2.0 uniquely balances ultra-low 10 µA current, SOT323-5L space efficiency, and 2.048 V factory-trimmed output-making it optimal for battery longevity and PCB area constraints in portable instrumentation.

Availability

LM4040CECT-2.0 is available at Aetrix Electronics and suitable for portable medical devices, industrial 4–20 mA transmitters, smart metering systems, and battery-powered data loggers requiring stable component supply with guaranteed long-term continuity.

Supply support for LM4040CECT-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 sensing solutions for industrial, automotive, and consumer markets.

LM4040 belongs to ST's precision analog portfolio, engineered specifically for high-accuracy, low-power voltage referencing in space- and energy-constrained embedded systems across industrial and portable applications.

FAQ

What is the minimum operating current for LM4040CECT-2.0 at –40 °C?

At –40 °C, the minimum operating current (I_kmin) is 12 µA for the 2.048 V version. This ensures stable regulation under cold-start conditions in outdoor industrial sensors, where insufficient current would cause output collapse below specified voltage.

Can LM4040CECT-2.0 drive a 100 nF capacitive load without oscillation?

Yes-LM4040CECT-2.0 is explicitly characterized for stability with capacitive loads up to 1 µF. At 100 nF, phase margin exceeds 45° per Figure 11 in DS13886, enabling direct use with ceramic decoupling without series resistance or ferrite beads.

Is the NC pin on SOT323-5L electrically isolated?

Yes, pin 4 (NC) has no internal connection. ST's datasheet states it "must be left unconnected or connected to anode"; tying it to anode improves thermal dissipation margin but does not affect electrical function or accuracy.

How does thermal hysteresis impact calibration repeatability in field-deployed instruments?

Thermal hysteresis of 120 ppm means voltage may shift up to ±0.245 mV between successive thermal cycles (e.g., –40 °C → +25 °C → +125 °C → +25 °C). This is measurable in Class I metrology but acceptable for non-certified industrial monitoring where recalibration intervals exceed 12 months.

LM4040CECT-2.0 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

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 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323-5

LM4040CECT-2.0 FAQ

1.How can I place an order for LM4040CECT-2.0 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040CECT-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 LM4040CECT-2.0 reliable?

The price and inventory of LM4040CECT-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 LM4040CECT-2.0 is usually 5 days.

3.What payment methods are accepted for LM4040CECT-2.0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CECT-2.0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040CECT-2.0?

LM4040CECT-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040CECT-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 LM4040CECT-2.0?

For technical support, including LM4040CECT-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CECT-2.0 requirements.

6.How does Aetrix verify that LM4040CECT-2.0 is sourced from the original manufacturer or authorized distributors?

All LM4040CECT-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 LM4040CECT-2.0 meets industry standards.

7.What is the process for return or replacement of LM4040CECT-2.0?

All LM4040CECT-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CECT-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 LM4040CECT-2.0 part is unused and in its original packaging.

Return procedure for LM4040CECT-2.0:

1.Submit a request within 90 days.

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

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