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

STMicroelectronics LM4040DECT-2.5

Name: LM4040DECT-2.5
Brand: STMicroelectronics
SKU: LM4040DECT-2.5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040DECT-2.5

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: LM4040DECT-2.5.pdf

Description:: IC VREF SHUNT 2.5V 5TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,479

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Product details

Overview

LM4040DECT-2.5 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 2.5 V output with ±1% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, and ultra-low 10 µA operating current - enabling high-accuracy analog sensing and ADC biasing in space-constrained industrial instrumentation.

For engineers reviewing the LM4040DECT-2.5 datasheet, LM4040DECT-2.5 pinout, LM4040DECT-2.5 application, or LM4040DECT-2.5 equivalent, key selection criteria include low-current regulation capability (10 µA min), SOT323-5L package footprint, thermal hysteresis (120 ppm), low-frequency noise (10 µV_p-p), and capacitive-load stability up to 1 µF.

Technical Context

The LM4040DECT-2.5 operates as a two-terminal shunt reference, requiring only an external current-limiting resistor to regulate voltage across its cathode-anode terminals. Its bandgap-based core achieves 2.5 V nominal output with guaranteed performance over −40 °C to +125 °C, supported by internal curvature compensation for flat temperature response.

It exhibits 0.15–0.3 Ω static impedance (R_KA) and maintains stability with capacitive loads up to 1 µF, verified via stability plane analysis. The NC pin in the SOT323-5L package must remain unconnected or tied to anode - not used for signal routing or biasing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.500 V ±1% at 25 °C - ensures ≤25 mV absolute error in 12-bit ADC reference paths
Initial Accuracy	±1% (LM4040D grade) - defines worst-case offset in factory-calibrated sensor front-ends
Temp Coefficient	≤70 ppm/°C - contributes ≤175 µV drift over full −40 °C to +125 °C range
Operating Current	10 µA min / 15 mA max - enables operation from high-impedance dividers or micro-power LDOs
Low-Freq Noise	10 µV_p-p (0.1–10 Hz) - preserves SNR in precision weigh-scale or strain-gauge amplifiers
Static Impedance	0.15–0.3 Ω - minimizes load-induced voltage shift in dynamic current-sense applications
Thermal Hysteresis	120 ppm - limits repeatability error after thermal cycling in field-deployed test equipment

Pinout & Package

SOT323-5L is a 1.8 × 2.1 mm, 5-pin surface-mount package with three functional terminals (cathode, anode, NC) and two unused pins. Its compact footprint supports high-density PCB layouts in portable instrumentation and modular PLC I/O modules.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Reference output node	Connected to load and feedback network; sinks regulated current to maintain 2.5 V
2 (NC)	No-connect terminal	Must be left floating or tied to anode - no electrical function or internal connection
3 (Anode)	Current return path	Connected to system ground or negative rail; completes shunt current loop
4 (NC)	No-connect terminal	Structural pad only; no internal bond wire or silicon connection
5 (NC)	No-connect terminal	Structural pad only; no internal bond wire or silicon connection

Key Features

Feature	Design Value
Ultra-low operating current	10 µA minimum - extends battery life >10 years in coin-cell-powered data loggers
Capacitive-load stability	Stable with up to 1 µF output capacitance - eliminates need for isolation resistors in noisy environments
Industrial temperature range	−40 °C to +125 °C operation - qualified for under-hood automotive sensors and motor-drive control boards
Low LF noise	10 µV_p-p (0.1–10 Hz) - avoids 1/f noise degradation in high-resolution delta-sigma ADC references
High precision grading	D-grade (±1%) offers cost-optimized accuracy for non-critical calibration points

Applications

Portable Data Acquisition

Industrial Sensor Signal Chain

Use Scenario: Battery-powered handheld multimeter sampling thermocouple and RTD inputs at 100 kSPS.

IC Role / Device Role / Timing Role: Shunt reference providing excitation and ADC reference voltage for dual-channel SAR converter.

Use Value: 10 µA quiescent current enables >5-year battery life; 70 ppm/°C TC ensures <0.05% reading drift across operating temperature.

Use Scenario: 4–20 mA transmitter module conditioning pressure sensor output before current-loop drive.

IC Role / Device Role / Timing Role: Precision 2.5 V reference for op-amp gain-setting and DAC output scaling.

Use Value: ±1% initial accuracy meets Class A transmitter spec; SOT323-5L footprint saves >30% board area vs. SOIC-8 alternatives.

Medical Vital Sign Monitor

Programmable Logic Controller I/O

Use Scenario: ECG front-end with 24-bit delta-sigma ADC acquiring biopotential signals at 1 kSPS.

IC Role / Device Role / Timing Role: Low-noise reference for ADC and analog front-end PGA gain calibration.

Use Value: 10 µV_p-p low-frequency noise prevents baseline wander artifacts; thermal hysteresis <120 ppm ensures repeatable calibration post-sterilization.

Use Scenario: Modular PLC analog input card digitizing 0–10 V industrial process signals.

IC Role / Device Role / Timing Role: Stable reference for multiplexed 16-bit SAR ADC and isolated current-sense amplifier.

Use Value: Stable regulation with 10 µF local decoupling capacitor suppresses transients from nearby relay switching; −40 °C to +125 °C rating supports DIN-rail enclosure operation.

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 set via resistors); 2% initial accuracy; 100 ppm/°C TC; 80 µA min current	Requires external resistors; higher TC and current limit accuracy reduce suitability for battery-critical or high-stability systems	Choose when adjustable output or higher output current (>100 mA) is required; avoid where size or ultra-low current is critical
MAX6008AEUR+T	Fixed 2.5 V; ±0.2% accuracy; 30 ppm/°C TC; 12 µA min current; SOT23-3 package	Higher accuracy and lower TC improve metrology-grade designs but increase cost; SOT23-3 lacks NC pins for mechanical reinforcement	Prefer for lab-grade instruments needing <0.5 mV total error; accept premium pricing and tighter layout constraints

Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040DECT-2.5 delivers optimal balance of ultra-low current (10 µA), compact SOT323-5L footprint, and industrial temp range - making it ideal for cost-sensitive, space-constrained, and battery-operated applications where ±1% accuracy suffices.

Availability

LM4040DECT-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and medical monitoring devices requiring stable component supply with long-term lifecycle visibility.

Supply support for LM4040DECT-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 analog, power, MCU, 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 voltage referencing in harsh-environment measurement systems - emphasizing accuracy retention across temperature, time, and load variations.

FAQ

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

At −40 °C, the LM4040DECT-2.5 requires a minimum cathode current of 12 µA to maintain regulation - per Table 3 of DS13886 Rev 4. This exceeds the 25 °C value (10 µA) due to increased bandgap voltage curvature effects at cold temperatures, and must be ensured by appropriate current-limiting resistor selection.

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

No - the NC pins (2, 4, 5) in the SOT323-5L package have no internal connection and must remain unconnected or be tied to the anode (pin 3). Grounding them may cause mechanical stress or solder wicking issues without electrical benefit, and violates ST's recommended layout per Figure 14 and note in Section 1 of DS13886.

How does load capacitance affect stability, and what is the maximum safe value?

Per Figure 11 (Stability plane vs. C_OUT), the LM4040DECT-2.5 remains stable with up to 1 µF output capacitance when operating at ≥10 µA cathode current. Exceeding this value risks oscillation due to phase margin reduction - especially below 10 µA - so designers must verify stability using the provided contour plot for their specific current and temperature conditions.

Is the LM4040DECT-2.5 RoHS-compliant and halogen-free?

Yes - the LM4040DECT-2.5 is manufactured in ST's ECOPACK2-compliant process, 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 LM4040DECT-2.5.

LM4040DECT-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:: ±1%

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

LM4040DECT-2.5 FAQ

1.How can I place an order for LM4040DECT-2.5 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040DECT-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 LM4040DECT-2.5 reliable?

The price and inventory of LM4040DECT-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 LM4040DECT-2.5 is usually 5 days.

3.What payment methods are accepted for LM4040DECT-2.5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DECT-2.5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040DECT-2.5?

LM4040DECT-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040DECT-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 LM4040DECT-2.5?

For technical support, including LM4040DECT-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DECT-2.5 requirements.

6.How does Aetrix verify that LM4040DECT-2.5 is sourced from the original manufacturer or authorized distributors?

All LM4040DECT-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 LM4040DECT-2.5 meets industry standards.

7.What is the process for return or replacement of LM4040DECT-2.5?

All LM4040DECT-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DECT-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 LM4040DECT-2.5 part is unused and in its original packaging.

Return procedure for LM4040DECT-2.5:

1.Submit a request within 90 days.

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

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