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

STMicroelectronics LM4040CECT-3.0

Name: LM4040CECT-3.0
Brand: STMicroelectronics
SKU: LM4040CECT-3.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040CECT-3.0

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: LM4040CECT-3.0.pdf

Description:: IC VREF SHUNT 3V 5TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,913

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Product details

Overview

LM4040CECT-3.0 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 3.0 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 supports capacitive loads up to 1 µF, making it ideal for battery-powered data acquisition front-ends requiring low-drift, low-noise biasing.

For engineers reviewing the LM4040CECT-3.0 datasheet, LM4040CECT-3.0 pinout, LM4040CECT-3.0 application, or LM4040CECT-3.0 equivalent, key selection criteria include shunt reference stability under varying load current (ΔVk/ΔIk ≤ 4 mV), low-frequency noise (10 µVp-p), thermal hysteresis (120 ppm), and SOT323-5L footprint compatibility in space-constrained industrial sensor nodes.

Technical Context

The LM4040CECT-3.0 functions as a two-terminal shunt reference, regulating voltage by sinking adjustable cathode current while maintaining a precise reverse breakdown voltage. Its bandgap-derived core achieves ±0.5% tolerance over temperature without external trimming.

It exhibits stable operation with capacitive loads up to 1 µF (verified via stability plane analysis), features 0.15–0.3 Ω static impedance (Rka), and delivers 10 µVp-p low-frequency noise (0.1–10 Hz) - critical for high-resolution ADC biasing in portable instrumentation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.0 V nominal, ±0.5% initial accuracy at 25 °C - ensures minimal calibration burden in 12-bit+ data converters.
Operating Current	10 µA min, 15 mA max - enables multi-year battery life in always-on sensor transmitters.
Temp Coefficient	≤70 ppm/°C - limits drift to ±0.21 V over -40 to +125 °C, supporting industrial-grade measurement integrity.
Low-Freq Noise	10 µVp-p (0.1–10 Hz) - avoids introducing quantization error in sub-16-bit analog signal chains.
Static Impedance	0.15–0.3 Ω - minimizes output voltage shift under dynamic load transients in multiplexed sensor systems.
Thermal Hysteresis	120 ppm - guarantees repeatable voltage after thermal cycling, essential for field-deployed calibration equipment.

Pinout & Package

The LM4040CECT-3.0 is housed in a 5-pin SOT323-5L package (3 active terminals + 2 NC pins). The NC pins (pins 2 and 5) must remain unconnected or tied to anode per datasheet guidance. This compact 2.0 × 2.2 mm outline supports high-density PCB layouts in handheld test gear and IoT edge nodes.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Cathode)	Reference Output Node	Sinks regulated current; connects to ADC reference input or op-amp feedback network.
Pin 3 (Anode)	Ground Reference Terminal	Provides return path; must be low-impedance to avoid ground bounce-induced error.
Pin 2 & 5 (NC)	No Connect	Electrically isolated; floating or tied to anode to improve thermal symmetry and reduce package stress effects.

Key Features

Feature	Design Value
Ultra-low quiescent current	10 µA typical - extends shelf life of coin-cell–powered calibration standards beyond 10 years.
Capacitive load stability	Stable with up to 1 µF output capacitance - eliminates need for external isolation resistors in noisy power rail environments.
Industrial temperature range	-40 to +125 °C operation - qualified for under-hood automotive sensors and factory-floor PLC analog modules.
Low thermal hysteresis	120 ppm - ensures <±0.36 mV repeatability after thermal cycling, critical for metrology-grade references.

Applications

Portable Multimeter Front-End

Wireless Sensor Node ADC Bias

Use Scenario: High-impedance voltage measurement circuitry in handheld digital multimeters powered by CR2032 cells.

IC Role / Device Role / Timing Role: Shunt reference providing stable 3.0 V reference for 16-bit SAR ADC and auto-ranging amplifier stages.

Use Value: 10 µA operating current enables >5-year battery life; ±0.5% accuracy eliminates factory recalibration during product lifetime.

Use Scenario: Battery-operated environmental sensor node transmitting temperature/humidity via BLE.

IC Role / Device Role / Timing Role: Precision bias source for sigma-delta ADC driving thermistor and humidity sensor signal conditioning.

Use Value: 10 µVp-p low-frequency noise prevents baseline drift in sub-1°C temperature resolution; SOT323-5L footprint fits 8 mm² PCB area budget.

Industrial Pressure Transmitter

Calibration Equipment Reference

Use Scenario: 4–20 mA loop-powered pressure transmitter operating in oil & gas field cabinets (-40 to +85 °C).

IC Role / Device Role / Timing Role: Stable 3.0 V reference for bridge excitation and analog front-end gain-setting resistors.

Use Value: 70 ppm/°C tempco ensures <±0.15% full-scale error over operating range; robustness to capacitive load simplifies EMI filtering design.

Use Scenario: Benchtop calibration source verifying accuracy of lab-grade DMMs and data loggers.

IC Role / Device Role / Timing Role: Primary voltage reference in programmable reference subsystem, buffered and filtered before distribution.

Use Value: 120 ppm thermal hysteresis guarantees repeatable 3.000 V output after ambient cycling; low noise preserves traceability to national standards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV431ACDBVR	Adjustable (1.24–6 V) vs. fixed 3.0 V; higher 80 µA IQ; ±1% initial accuracy.	Requires external resistor divider; less suitable for space-constrained fixed-voltage designs.	Select when programmable reference voltage or tighter thermal hysteresis (<50 ppm) is required.
MAX6003EUR+T	Fixed 3.0 V; ±0.2% initial accuracy; 12 µA IQ; 50 ppm/°C tempco; SOT23-3 package.	Higher accuracy but larger package; no NC pins - less layout flexibility for thermal management.	Select when highest initial accuracy is prioritized over board area and thermal hysteresis performance.

Compared with TLV431ACDBVR and MAX6003EUR+T, the LM4040CECT-3.0 offers optimal balance of ultra-low IQ (10 µA), SOT323-5L miniaturization, and 120 ppm hysteresis - uniquely suited for long-life, space-limited, high-repeatability industrial sensing.

Availability

LM4040CECT-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and wireless calibration equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040CECT-3.0 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 low-power, high-stability shunt reference applications in harsh-environment measurement systems where size, accuracy, and thermal reliability are non-negotiable.

FAQ

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

The LM4040CECT-3.0 requires a minimum cathode current (Ikmin) of 25 µA at -40 °C to maintain regulation, per Table 3 of DS13886 Rev 4. This increases from 15 µA at 25 °C due to reduced bandgap voltage stability at low temperatures, and must be accounted for in series resistor sizing for battery-powered applications.

Can the NC pins (2 and 5) be left floating without affecting performance?

Yes - pins 2 and 5 are explicitly designated as no-connect and may be left floating per Figure 1 and note on page 2 of DS13886 Rev 4. However, tying them to the anode (pin 3) improves thermal symmetry and reduces mechanical stress-induced voltage drift, especially in thermally cycled industrial deployments.

How does the 10 µVp-p low-frequency noise impact 16-bit ADC performance?

At 10 µVp-p (0.1–10 Hz), the LM4040CECT-3.0 contributes <0.07 LSB of peak-to-peak noise to a 3.0 V full-scale 16-bit ADC (LSB = 45.8 µV), well within acceptable limits for precision DC measurements. This enables effective utilization of ≥15 ENOB without additional reference buffering or filtering.

Is the SOT323-5L package RoHS-compliant and halogen-free?

Yes - the LM4040CECT-3.0 uses ST's ECOPACK2-compliant SOT323-5L package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. Full compliance documentation, including material declarations and test reports, is accessible via ST's quality portal using order code LM4040CECT-3.0.

LM4040CECT-3.0 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):: 3V

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:: 25 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323-5

LM4040CECT-3.0 FAQ

1.How can I place an order for LM4040CECT-3.0 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040CECT-3.0 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-3.0 reliable?

The price and inventory of LM4040CECT-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CECT-3.0 is usually 5 days.

3.What payment methods are accepted for LM4040CECT-3.0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CECT-3.0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040CECT-3.0?

LM4040CECT-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040CECT-3.0 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-3.0?

For technical support, including LM4040CECT-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CECT-3.0 requirements.

6.How does Aetrix verify that LM4040CECT-3.0 is sourced from the original manufacturer or authorized distributors?

All LM4040CECT-3.0 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-3.0 meets industry standards.

7.What is the process for return or replacement of LM4040CECT-3.0?

All LM4040CECT-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CECT-3.0, 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-3.0 part is unused and in its original packaging.

Return procedure for LM4040CECT-3.0:

1.Submit a request within 90 days.

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

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