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

STMicroelectronics LM4040CECT-2.5

Name: LM4040CECT-2.5
Brand: STMicroelectronics
SKU: LM4040CECT-2.5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040CECT-2.5

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: LM4040CECT-2.5.pdf

Description:: IC VREF SHUNT 2.5V 5TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,470

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Product details

Overview

LM4040CECT-2.5 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 2.5 V output with ±0.5% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, and ultra-low 10 µA operating current - used in high-resolution ADC biasing, portable sensor signal conditioning, and battery-powered data loggers.

For engineers reviewing the LM4040CECT-2.5 datasheet, LM4040CECT-2.5 pinout, LM4040CECT-2.5 application, or LM4040CECT-2.5 equivalent, key selection criteria include shunt reference stability under capacitive loads, low-frequency noise (10 µV_p-p), thermal hysteresis (120 ppm), and SOT323-5L package compatibility with space-constrained PCB layouts.

Technical Context

The LM4040CECT-2.5 operates as a two-terminal shunt reference, sinking current to maintain precise 2.5 V across its cathode-anode terminals. It achieves regulation with as little as 12 µA over full industrial temperature range (−40 to +125 °C) and exhibits <0.3 Ω static impedance for minimal load-induced voltage shift.

Its internal bandgap core delivers 2.5 V output with guaranteed 70 ppm/°C tempco and 120 ppm thermal hysteresis. The device remains stable with capacitive loads up to 1 µF, verified via stability plane analysis in DS13886 Rev 4 Figure 11.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.500 V ±0.5% at 25 °C - ensures ≤12.5 mV absolute error in precision analog front-ends
Initial Accuracy	±0.5% (LM4040C grade) - enables 12-bit system-level accuracy without trimming
Operating Current	10 µA typical at 25 °C - supports >10-year battery life in always-on IoT sensors
Tempco	≤70 ppm/°C - limits drift to ±8.75 mV over −40 to +125 °C range
Low-Frequency Noise	10 µV_p-p (0.1–10 Hz) - preserves SNR in 24-bit delta-sigma ADC references
Static Impedance	0.15–0.3 Ω - minimizes voltage shift under dynamic load transients
Thermal Hysteresis	120 ppm - corresponds to ≤0.3 mV hysteresis after thermal cycling

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Reference output node	Connected to load and feedback network; sinks current to regulate 2.5 V
2 (NC)	No-connect terminal	Must be left unconnected or tied to anode; no internal connection
3 (Anode)	Current return path	Connected to ground or current-setting resistor; completes shunt loop
4 (NC)	No-connect terminal	Must be left unconnected or tied to anode; no internal connection
5 (NC)	No-connect terminal	Must be left unconnected or tied to anode; no internal connection

Key Features

Feature	Design Value
Capacitive-load stability	Stable with up to 1 µF output capacitance - eliminates need for external isolation resistors
Micropower operation	10 µA typical quiescent current - enables direct use with high-value current-setting resistors in energy-harvesting systems
Industrial temperature range	−40 to +125 °C operation - qualified for automotive cabin and industrial motor control environments
Low LF noise	10 µV_p-p (0.1–10 Hz) - reduces quantization uncertainty in precision measurement front-ends
High DC precision	±0.5% initial tolerance + 70 ppm/°C tempco - meets requirements for Class 0.1 metering and medical diagnostics

Applications

Portable Data Acquisition

Battery-Powered Sensor Node

Use Scenario: Handheld multimeter measuring 0–2.5 V input range with 16-bit SAR ADC.

IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V reference for ADC VREF input and op-amp biasing.

Use Value: ±0.5% initial accuracy and 70 ppm/°C tempco ensure <0.02% full-scale error across operating temperature.

Use Scenario: Wireless soil moisture sensor powered by CR2032 coin cell.

IC Role / Device Role / Timing Role: Low-current shunt reference setting ADC reference and LDO feedback divider.

Use Value: 10 µA operating current extends battery life beyond 5 years in sleep-dominated duty cycle.

Medical Diagnostic Instrument

Industrial PLC Analog Input Module

Use Scenario: Portable ECG amplifier requiring stable 2.5 V reference for instrumentation amplifier gain setting.

IC Role / Device Role / Timing Role: Precision voltage reference for biasing analog signal chain and ADC reference.

Use Value: 10 µV_p-p low-frequency noise prevents baseline wander in sub-Hz biopotential signals.

Use Scenario: DIN-rail mounted PLC module digitizing 4–20 mA current loops with 24-bit sigma-delta ADC.

IC Role / Device Role / Timing Role: High-stability shunt reference for ratiometric current-to-voltage conversion and ADC reference.

Use Value: Thermal hysteresis of 120 ppm ensures repeatable calibration after ambient temperature cycling in factory floors.

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 (2.5–36 V) 3-terminal shunt; 1% initial accuracy; 100 µA min cathode current	Requires external resistor network; higher minimum current increases power loss	Select when adjustable output or higher voltage (>2.5 V) is required; not drop-in for fixed 2.5 V designs
MAX6008AEUR+T	Fixed 2.5 V; ±0.2% initial accuracy; SOT23-3 package; 15 µA typical operating current	Higher accuracy but larger package and 50% higher quiescent current	Prefer when tighter initial tolerance is critical and board space allows SOT23-3; avoid if <10 µA operation is mandatory

Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040CECT-2.5 uniquely balances ultra-low 10 µA current, SOT323-5L miniaturization, and ±0.5% accuracy - making it optimal for space- and power-constrained fixed-reference applications where adjustability or sub-0.2% tolerance is unnecessary.

Availability

LM4040CECT-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial analog input modules requiring stable component supply with guaranteed long-term availability.

Supply support for LM4040CECT-2.5 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 microcontrollers, power ICs, sensors, and precision analog components for industrial, automotive, and consumer markets.

The LM4040 series belongs to ST's precision analog portfolio, engineered specifically for micropower, high-accuracy shunt reference applications in space- and energy-constrained systems across industrial and portable equipment.

FAQ

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

Per DS13886 Rev 4 Table 3, LM4040CECT-2.5 requires 12 µA minimum cathode current (I_kmin) at −40 °C to maintain regulation. This value increases to 25 µA for 2.5 V versions when operating above 3.0 V output variants, but remains 12 µA for this specific 2.5 V part across the full industrial temperature range.

Can the NC pins on the SOT323-5L package be grounded?

No - pins 2, 4, and 5 are unconnected internally and must either remain floating or be tied to the anode (pin 3), as explicitly stated in Figure 1 and the note on page 2 of DS13886 Rev 4. Grounding NC pins may cause unpredictable leakage paths or violate internal layout constraints.

How does the 10 µV_p-p low-frequency noise impact 24-bit ADC performance?

At 10 µV_p-p (0.1–10 Hz), the noise contributes ≈0.4 LSB of peak-to-peak variation in a 24-bit system referenced to 2.5 V (LSB = 149 nV). This remains below the inherent noise floor of most 24-bit delta-sigma ADCs, preserving effective resolution without requiring additional filtering.

Is the LM4040CECT-2.5 qualified for automotive applications?

While LM4040CECT-2.5 operates across −40 to +125 °C and meets AEC-Q200 stress test recommendations for temperature cycling and HBM ESD (2 kV), it is not officially AEC-Q100 qualified. For automotive safety-critical systems, ST recommends the automotive-grade LM4040-Q1 series instead.

LM4040CECT-2.5 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):: 2.5V

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-2.5 FAQ

1.How can I place an order for LM4040CECT-2.5 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040CECT-2.5 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-2.5 reliable?

The price and inventory of LM4040CECT-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CECT-2.5 is usually 5 days.

3.What payment methods are accepted for LM4040CECT-2.5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CECT-2.5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040CECT-2.5?

LM4040CECT-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040CECT-2.5 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-2.5?

For technical support, including LM4040CECT-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CECT-2.5 requirements.

6.How does Aetrix verify that LM4040CECT-2.5 is sourced from the original manufacturer or authorized distributors?

All LM4040CECT-2.5 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-2.5 meets industry standards.

7.What is the process for return or replacement of LM4040CECT-2.5?

All LM4040CECT-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CECT-2.5, 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-2.5 part is unused and in its original packaging.

Return procedure for LM4040CECT-2.5:

1.Submit a request within 90 days.

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

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