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

STMicroelectronics LM4040CELT-3.0

Name: LM4040CELT-3.0
Brand: STMicroelectronics
SKU: LM4040CELT-3.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040CELT-3.0

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: LM4040CELT-3.0.pdf

Description:: IC VREF SHUNT 3V SC70

Quantity:: RFQ Add To RFQ list

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Inventory:6,000

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Product details

Overview

LM4040CELT-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 without instability-ideal for battery-powered data acquisition front-ends where space, power, and long-term voltage stability are critical.

For engineers reviewing the LM4040CELT-3.0 datasheet, LM4040CELT-3.0 pinout, LM4040CELT-3.0 application, or LM4040CELT-3.0 equivalent, key selection criteria include shunt reference bias current range (12–25 µA over temperature), low-frequency noise (10 µV_p-p), static impedance (0.15–0.3 Ω), thermal hysteresis (120 ppm), and SOT23-3L package compatibility with high-density PCB layouts.

Technical Context

The LM4040CELT-3.0 functions as a two-terminal shunt reference, regulating voltage by sinking adjustable cathode current while maintaining a precise 3.0 V reverse breakdown across its cathode-anode terminals. Its bandgap-derived core ensures monotonic temperature behavior and low thermal hysteresis (120 ppm).

It requires no external components for basic operation but remains stable with up to 1 µF capacitive load, validated via stability plane analysis. The device's dynamic impedance stays below 0.3 Ω across 10 µA–15 mA cathode current, enabling clean regulation in low-noise analog signal chains.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.0 V nominal; ±0.5% tolerance at 25 °C ensures ≤15 mV absolute error in precision ADC biasing.
Initial Accuracy	±0.5% (LM4040C grade) - enables 12-bit system-level accuracy without trimming.
Temp Coefficient	≤70 ppm/°C - contributes ≤2.1 mV drift over full -40 to +125 °C range.
Operating Current	12 µA min at -40 °C; 25 µA min at +125 °C - supports ultra-low-power sensor nodes.
Low-Freq Noise	10 µV_p-p (0.1–10 Hz) - preserves SNR in high-resolution 24-bit delta-sigma ADC references.
Static Impedance	0.15–0.3 Ω - minimizes load-induced voltage shift in varying-current applications.
Thermal Hysteresis	120 ppm - limits repeatable voltage error after thermal cycling in industrial environments.

Pinout & Package

SOT23-3L package: 3-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.12 mm height, RoHS-compliant ECOPACK2. Thermal resistance R_thJA = 210 °C/W enables operation at full rated current without heatsinking in ambient ≤85 °C.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Reference output node	Connected to load and bias resistor; sinks regulated current to maintain 3.0 V at this terminal relative to anode.
Anode (Pin 2)	Ground reference	Common return path; must be tied to system ground or lowest potential point in shunt configuration.
NC (Pin 3)	No-connect	Internally unconnected; must remain floating or tied to anode per datasheet guidance-no signal routing.

Key Features

Feature	Design Value
Ultra-low operating current	10 µA typical at 25 °C - extends battery life >10 years in 10 µA sleep-mode IoT sensors.
Capacitive-load stability	Stable with 0–1 µF output capacitance - eliminates need for isolation resistors in ADC reference buffers.
Industrial temperature range	-40 to +125 °C operation - qualified for under-hood automotive and factory-floor PLC modules.
Low LF noise performance	10 µV_p-p (0.1–10 Hz) - avoids introducing measurable error in precision weigh-scale or strain-gauge amplifiers.
High precision grading	0.5% initial tolerance (C-grade) - reduces calibration overhead in production test for portable medical devices.

Applications

Portable Data Loggers

Industrial Sensor Transmitters

Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure every 5 minutes using a 24-bit ADC.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.0 V excitation and ADC reference for ratiometric sensor measurements.

Use Value: 10 µA quiescent current extends CR2032 coin-cell life beyond 5 years; ±0.5% accuracy maintains ±0.015 °C temperature resolution.

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

IC Role / Device Role / Timing Role: Precision shunt reference establishing accurate 3.0 V基准 for DAC-controlled current output stage.

Use Value: 70 ppm/°C tempco ensures <0.1% full-scale error drift over operating range; SOT23-3L fits tight 2-layer PCB layout.

Medical Wearables

Automotive Cabin Sensors

Use Scenario: ECG patch measuring microvolt-level biopotentials with low-noise instrumentation amplifier and SAR ADC.

IC Role / Device Role / Timing Role: Low-noise 3.0 V reference for analog front-end biasing and ADC reference voltage.

Use Value: 10 µV_p-p low-frequency noise prevents baseline wander in sub-Hz physiological signals; 0.3 Ω impedance avoids gain error in buffered configurations.

Use Scenario: Occupancy detection module using IR proximity sensing and ambient light measurement in vehicle cabin.

IC Role / Device Role / Timing Role: Stable 3.0 V reference for optical sensor biasing and ADC conversion of photodiode current.

Use Value: -40 to +125 °C rating supports placement near HVAC ducts; NC pin simplifies layout by eliminating unused trace routing.

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 setpoint), 1% initial accuracy, 100 ppm/°C tempco, 80 µA min current	Requires external resistor divider; higher current demand limits ultra-low-power use	Select when programmability or cost sensitivity outweighs fixed-voltage precision and micropower needs.
MAX6003EUR+T	Fixed 3.0 V, ±0.2% accuracy, 20 ppm/°C tempco, 35 µA min current, SC70-3 package	Higher accuracy and lower tempco, but 3.5× higher operating current and smaller thermal margin	Choose for metrology-grade stability where power budget allows ≥35 µA continuous draw.

Compared with TLVH431ACDBVR and MAX6003EUR+T, the LM4040CELT-3.0 uniquely balances 0.5% accuracy, 10 µA operation, and 70 ppm/°C tempco in a widely supported SOT23-3L package-making it optimal for space-constrained, battery-critical industrial and portable systems requiring proven long-term stability.

Availability

LM4040CELT-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, medical wearables, and automotive cabin sensing requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for LM4040CELT-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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM4040 belongs to ST's precision analog portfolio, engineered specifically for high-accuracy, low-power voltage referencing in harsh-environment applications where long-term stability and minimal board area are mandatory.

FAQ

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

The LM4040CELT-3.0 requires a minimum cathode current of 12 µA at -40 °C to maintain regulation, as specified in Table 3 of DS13886 Rev 4. This value increases to 25 µA at +125 °C due to increased bandgap voltage drift at temperature extremes.

Can the NC pin (Pin 3) be left floating in the SOT23-3L package?

Yes - Pin 3 is explicitly designated as "NC" (no connect) in the datasheet. It must either remain unconnected or be tied to the anode (Pin 2); connecting it to any other net may compromise device reliability or parametric performance.

How does the LM4040CELT-3.0 behave with a 100 nF capacitive load?

Per Figure 9 in DS13886 Rev 4, the LM4040CELT-3.0 exhibits stable turn-on behavior with 100 nF load capacitance and shows no oscillation or overshoot. Its inherent design allows direct connection to sampling capacitors in successive-approximation ADCs without series isolation resistors.

Is the LM4040CELT-3.0 compatible with lead-free reflow soldering processes?

Yes - the SOT23-3L package is rated for lead-free reflow with a maximum lead temperature of 260 °C for 10 seconds (Table 1), fully compliant with IPC/JEDEC J-STD-020D.2 moisture sensitivity level is MSL3, requiring bake-out only if exposed to ambient >60% RH for >168 hours.

LM4040CELT-3.0 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: SC-70, SOT-323

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-323-3

LM4040CELT-3.0 FAQ

1.How can I place an order for LM4040CELT-3.0 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040CELT-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 LM4040CELT-3.0 reliable?

The price and inventory of LM4040CELT-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 LM4040CELT-3.0 is usually 5 days.

3.What payment methods are accepted for LM4040CELT-3.0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CELT-3.0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040CELT-3.0?

LM4040CELT-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040CELT-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 LM4040CELT-3.0?

For technical support, including LM4040CELT-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CELT-3.0 requirements.

6.How does Aetrix verify that LM4040CELT-3.0 is sourced from the original manufacturer or authorized distributors?

All LM4040CELT-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 LM4040CELT-3.0 meets industry standards.

7.What is the process for return or replacement of LM4040CELT-3.0?

All LM4040CELT-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CELT-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 LM4040CELT-3.0 part is unused and in its original packaging.

Return procedure for LM4040CELT-3.0:

1.Submit a request within 90 days.

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

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