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

STMicroelectronics LM4040AELT-2.5

Name: LM4040AELT-2.5
Brand: STMicroelectronics
SKU: LM4040AELT-2.5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040AELT-2.5

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: LM4040AELT-2.5.pdf

Description:: IC VREF SHUNT 2.5V SOT23-3

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Product details

Overview

LM4040AELT-2.5 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 2.500 V ±0.1% output at 10 µA operating current, with 70 ppm/°C max temperature coefficient and 10 µV_p-p low-frequency noise over -40°C to +125°C. It serves as a high-accuracy voltage基准 in analog-to-digital converter (ADC) reference paths, portable sensor signal conditioning, and battery-monitoring circuits where space and power are constrained.

For engineers reviewing the LM4040AELT-2.5 datasheet, LM4040AELT-2.5 pinout, LM4040AELT-2.5 application, or LM4040AELT-2.5 equivalent, key selection criteria include initial accuracy (±0.1%), ultra-low 10 µA quiescent current, SOT23-3L package footprint, and stability with capacitive loads up to 1 µF - critical for portable instrumentation and data acquisition designs.

Technical Context

The LM4040AELT-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 ±0.1% initial tolerance at 25°C and maintains 70 ppm/°C max drift over the full industrial temperature range (-40°C to +125°C).

It exhibits 0.15–0.3 Ω static impedance (R_KA) and 10 µV_p-p (0.1–10 Hz) low-frequency noise, enabling high-resolution measurement systems. The device remains stable with capacitive loads up to 1 µF without external compensation, verified per Figure 11's stability plane.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.500 V ±0.1% at 10 µA, 25°C - ensures ADC reference accuracy within 2.5 mV absolute error
Operating Current	10 µA min, 15 mA max - supports ultra-low-power battery operation and high-current regulation
Temp Coefficient	≤70 ppm/°C - limits voltage drift to ±0.875 mV over -40°C to +125°C span
Low-Freq Noise	10 µV_p-p (0.1–10 Hz) - preserves SNR in 16-bit+ data acquisition front-ends
Static Impedance	0.15–0.3 Ω - minimizes load-induced voltage shift under dynamic current demand
Thermal Hysteresis	120 ppm - guarantees repeatability after thermal cycling between -40°C and +125°C
Max Power Dissipation	500 mW - enables use with ≥33 Ω series resistor at 2.5 V output under worst-case current

Pinout & Package

SOT23-3L package: 3-pin surface-mount, 2.9 mm × 1.3 mm footprint, 1.12 mm height, RoHS-compliant ECOPACK2.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Reference output node	Connected to load and feedback network; sinks regulated current to maintain 2.5 V
Anode (Pin 2)	Ground reference terminal	Common return path; must be tied to system ground for proper regulation
NC (Pin 3)	No-connect terminal	Internally unconnected; must remain floating or tied to anode per datasheet guidance

Key Features

Feature	Design Value
Ultra-low operating current	10 µA minimum - extends battery life in portable gas sensors and wearables beyond 10 years
High initial accuracy	±0.1% (LM4040A grade) - eliminates need for post-assembly calibration in medical ECG front-ends
Capacitive-load stability	Stable with up to 1 µF output capacitance - simplifies filtering in noisy industrial PLC analog inputs
Wide temperature operation	-40°C to +125°C - supports under-hood automotive battery monitoring and motor control feedback
Low thermal hysteresis	120 ppm - ensures repeatable voltage after thermal stress in outdoor environmental sensors

Applications

Portable Medical Sensors

Data Acquisition Systems

Use Scenario: Battery-powered pulse oximeter measuring photodiode current with 16-bit SAR ADC.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 2.5 V reference for ADC VREF input.

Use Value: ±0.1% accuracy and 10 µA current ensure >15-bit effective resolution and multi-year battery runtime.

Use Scenario: Industrial 4–20 mA loop-powered transmitter digitizing thermocouple signals.

IC Role / Device Role / Timing Role: Stable 2.5 V reference for sigma-delta ADC and internal DAC calibration.

Use Value: 70 ppm/°C tempco and 0.3 Ω impedance minimize gain drift and linearity error across ambient temperature swings.

Automotive Battery Monitoring

Handheld Test Equipment

Use Scenario: In-vehicle 12 V battery voltage monitor with microcontroller ADC sampling every 5 seconds.

IC Role / Device Role / Timing Role: Low-quiescent shunt reference powering ADC reference rail during sleep mode.

Use Value: 10 µA current draw reduces standby power to <26 µW, meeting ISO 16750-2 cold-cranking requirements.

Use Scenario: Portable multimeter measuring DC voltage with auto-ranging and 200 kSPS sampling.

IC Role / Device Role / Timing Role: Primary reference for dual-slope and SAR ADC subsystems across ranges.

Use Value: 10 µV_p-p low-frequency noise prevents baseline wander in sub-mV measurements on 4½-digit display.

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), ±0.5% initial accuracy, 80 µA min current	Requires external resistors; higher current increases power in battery systems	Select when programmability or higher voltage output is required; not drop-in for fixed 2.5 V
ADR3425ARJZ-R7	Series reference, 2.5 V ±0.1%, 3.8 µA typical quiescent, SOT23-5	Three-terminal architecture requires separate input/output pins; less tolerant of reverse polarity	Choose for lowest possible supply current; verify PCB layout compatibility with series topology

Compared with TLVH431ACDBVR and ADR3425ARJZ-R7, the LM4040AELT-2.5 offers the smallest footprint (SOT23-3L), lowest minimum operating current among fixed 2.5 V shunt references, and guaranteed stability with 1 µF capacitive loads - making it optimal for space-constrained, single-supply, battery-operated measurement nodes.

Availability

LM4040AELT-2.5 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, automotive battery monitors, and handheld test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040AELT-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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, low-power, high-accuracy applications including portable instrumentation, battery monitoring, and sensor signal chains.

FAQ

What is the minimum operating current for LM4040AELT-2.5 at -40°C?

At -40°C, the minimum operating current (I_Kmin) is 12 µA for the 2.5 V version, as specified in Table 3 of DS13886 Rev 4. This ensures reliable regulation across the full industrial temperature range, exceeding the 10 µA nominal value at 25°C.

Can LM4040AELT-2.5 drive a 100 nF capacitor directly without oscillation?

Yes - Figure 11 (Stability plane vs. C_OUT) confirms stable operation with up to 1 µF output capacitance at all operating currents from 10 µA to 15 mA. A 100 nF capacitor falls well within the stable region, eliminating need for series resistance or isolation.

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 pin configuration note. Connecting it to anode does not affect performance and can improve mechanical robustness in high-vibration environments.

How does thermal hysteresis impact repeated measurements after temperature cycling?

Thermal hysteresis is 120 ppm, meaning voltage measured at 25°C after cycling to -40°C differs from voltage measured at 25°C after cycling to +125°C by up to ±0.3 mV. This affects absolute accuracy in applications with frequent ambient excursions but does not degrade short-term repeatability within a single thermal state.

LM4040AELT-2.5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: TO-236-3, SC-59, SOT-23-3

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:: ±0.1%

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-23-3

LM4040AELT-2.5 FAQ

1.How can I place an order for LM4040AELT-2.5 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040AELT-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 LM4040AELT-2.5 reliable?

The price and inventory of LM4040AELT-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 LM4040AELT-2.5 is usually 5 days.

3.What payment methods are accepted for LM4040AELT-2.5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AELT-2.5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040AELT-2.5?

LM4040AELT-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040AELT-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 LM4040AELT-2.5?

For technical support, including LM4040AELT-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AELT-2.5 requirements.

6.How does Aetrix verify that LM4040AELT-2.5 is sourced from the original manufacturer or authorized distributors?

All LM4040AELT-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 LM4040AELT-2.5 meets industry standards.

7.What is the process for return or replacement of LM4040AELT-2.5?

All LM4040AELT-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AELT-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 LM4040AELT-2.5 part is unused and in its original packaging.

Return procedure for LM4040AELT-2.5:

1.Submit a request within 90 days.

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

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