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

STMicroelectronics LM4040BELT-4.1

Name: LM4040BELT-4.1
Brand: STMicroelectronics
SKU: LM4040BELT-4.1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040BELT-4.1

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: LM4040BELT-4.1.pdf

Description:: IC VREF SHUNT 4.096V SC70

Quantity:: RFQ Add To RFQ list

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Inventory:4,130

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Product details

Overview

LM4040BELT-4.1 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 4.096 V output with ±0.2% 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 is used in high-resolution ADC/DAC biasing, portable instrumentation, and battery-powered data loggers where low drift and minimal quiescent current are critical.

For engineers reviewing the LM4040BELT-4.1 datasheet, LM4040BELT-4.1 pinout, LM4040BELT-4.1 application, or LM4040BELT-4.1 equivalent, key selection criteria include output voltage tolerance, thermal stability over industrial temperature range, load regulation performance, and compatibility with capacitive loads in space-constrained SOT23-3L layouts.

Technical Context

The LM4040BELT-4.1 functions as a two-terminal shunt reference, regulating voltage by sinking adjustable current through its cathode–anode path. Its bandgap-based core achieves 4.096 V nominal output with 10 µV_p-p low-frequency noise and 95 µV_RMS wideband noise-critical for 16-bit+ data acquisition systems.

It maintains stability with capacitive loads up to 1 µF (per Figure 11), exhibits <0.3 Ω static impedance (R_KA), and requires only 10 µA minimum cathode current for regulation at 25 °C-enabling direct use with high-value pull-up resistors in ultra-low-power sensor interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V nominal; ±0.2% initial accuracy ensures ≤±8.2 mV error at 25 °C for precise ADC reference scaling
Tempco	≤70 ppm/°C max; guarantees ≤±0.35 V total drift over –40 to +125 °C ambient range
Operating Current	10 µA min / 15 mA max; enables operation from high-impedance sources (e.g., 470 kΩ pull-up @ 4.8 V)
Low-Freq Noise	10 µV_p-p (0.1–10 Hz); minimizes quantization uncertainty in precision DC measurements
Static Impedance	0.15–0.3 Ω; ensures <0.3 mV output shift per 1 mA load variation-critical for stable feedback paths
Thermal Hysteresis	120 ppm; limits residual voltage offset after thermal cycling between –40 °C and +125 °C
Capacitive Load Stability	Stable with up to 1 µF output capacitance; simplifies filtering without external compensation

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Voltage reference output terminal	Sinks regulated current; connects to system reference node or ADC REF+ input
2 (Anode)	Current return path	Connects to ground or low-impedance return; defines reference potential
3 (NC)	No-connect terminal	Must be left unconnected or tied to anode; no internal connection or function

Key Features

Feature	Design Value
Ultra-low quiescent current	10 µA typical at 25 °C enables >10-year battery life in coin-cell–powered sensors
Industrial temperature range	–40 to +125 °C operation supports deployment in automotive engine control units and outdoor industrial nodes
Low LF noise performance	10 µV_p-p (0.1–10 Hz) preserves effective resolution in high-gain, low-bandwidth instrumentation amplifiers
Capacitive load tolerance	Stable with 0–1 µF output capacitance eliminates need for series resistance or external compensation networks
High initial accuracy grade	±0.2% (B-grade) reduces calibration overhead in factory-trimmed medical and test equipment

Applications

Portable Data Loggers

Industrial Sensor Transmitters

Use Scenario: Battery-powered environmental monitoring node logging temperature, humidity, and pressure at 1-minute intervals.

IC Role / Device Role / Timing Role: Shunt reference for 16-bit SAR ADC and analog front-end op-amps.

Use Value: 10 µA operating current extends CR2032 battery life beyond 5 years; 70 ppm/°C tempco keeps measurement error <±0.1% FS across outdoor temperature swings.

Use Scenario: 4–20 mA loop-powered pressure transmitter in oil & gas pipeline monitoring.

IC Role / Device Role / Timing Role: Precision voltage reference for DAC-driven current loop controller IC.

Use Value: ±0.2% initial accuracy eliminates field recalibration; SOT23-3L package fits tight PCB space constraints near transducer signal conditioning circuitry.

Medical Patient Monitors

Automotive Body Control Modules

Use Scenario: Portable ECG device acquiring biopotential signals with 24-bit delta-sigma ADC.

IC Role / Device Role / Timing Role: Low-noise reference for ADC reference buffer and gain-setting resistors.

Use Value: 10 µV_p-p low-frequency noise prevents baseline wander artifacts; stable performance at +40 °C ambient ensures clinical reliability.

Use Scenario: In-cabin climate control module measuring cabin temperature and humidity.

IC Role / Device Role / Timing Role: Reference source for microcontroller ADC inputs and analog sensor signal conditioning.

Use Value: –40 to +125 °C rating covers under-hood and interior environments; 0.3 Ω dynamic impedance prevents reference droop during PWM-controlled fan switching transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AIDBZR	Adjustable (2.5 V setpoint), ±0.5% initial accuracy, 100 ppm/°C tempco, 80 µA min current	Requires external resistor divider; higher current draw increases power budget impact	Select when adjustable output or tighter supply rejection is required; not drop-in for fixed 4.096 V use
MAX6008BEUR+T	Fixed 4.096 V, ±0.2% accuracy, 75 ppm/°C tempco, 12 µA min current, SC70-3 package	SC70-3 footprint differs; slightly higher tempco affects long-term drift in high-temp enclosures	Valid alternative if board layout allows SC70-3 rework; identical electrical specs but different thermal resistance (R_θJA = 275 °C/W vs. 210 °C/W)

Compared with TLVH431AIDBZR and MAX6008BEUR+T, LM4040BELT-4.1 offers the lowest thermal resistance (210 °C/W), best noise performance (10 µV_p-p), and smallest footprint among fixed 4.096 V shunt references-making it optimal for thermally constrained, high-precision, battery-sensitive designs.

Availability

LM4040BELT-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and automotive body control modules requiring stable component supply with guaranteed long-term continuity.

Supply support for LM4040BELT-4.1 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 sensing solutions for industrial, automotive, and consumer markets.

The LM4040 series belongs to ST's precision analog portfolio, engineered specifically for high-accuracy, low-power voltage referencing in space- and energy-constrained embedded systems across harsh industrial and automotive environments.

FAQ

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

Per Table 3, the LM4040BELT-4.1 requires 25 µA minimum cathode current (I_Kmin) at –40 °C to maintain regulation. This is higher than the 10 µA spec at 25 °C due to increased bandgap reference leakage at low temperatures-designers must ensure the pull-up resistor delivers ≥25 µA even at worst-case low-temperature, low-supply conditions.

Can the NC pin on the SOT23-3L package be grounded?

No-the NC pin (Pin 3) has no internal connection and must remain unconnected or be tied to the anode (Pin 2). Grounding it creates an undefined path that may disrupt thermal dissipation or induce parasitic coupling; ST's datasheet explicitly states "NC pin must be left unconnected or connected to anode" to preserve specified R_θJA and electrical behavior.

How does load regulation affect output voltage at 15 mA cathode current?

At 15 mA cathode current, the LM4040BELT-4.1 exhibits ≤4 mV change in output voltage (ΔV_K/ΔI_K) across –40 to +125 °C, per Table 4. This corresponds to <0.1% full-scale deviation for a 4.096 V reference-sufficient for 12-bit systems but requiring derating or buffering for 16-bit accuracy in high-current transient scenarios.

Is the LM4040BELT-4.1 qualified for automotive AEC-Q100?

No-the LM4040BELT-4.1 is specified for industrial temperature range (–40 to +125 °C) but is not AEC-Q100 qualified. ST offers the pin-compatible LM4040Q series (e.g., LM4040QBELT-4.1) with full AEC-Q100 Grade 1 qualification (–40 to +125 °C) and enhanced reliability testing for automotive applications.

LM4040BELT-4.1 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):: 4.096V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±0.2%

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

LM4040BELT-4.1 FAQ

1.How can I place an order for LM4040BELT-4.1 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040BELT-4.1 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 LM4040BELT-4.1 reliable?

The price and inventory of LM4040BELT-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BELT-4.1 is usually 5 days.

3.What payment methods are accepted for LM4040BELT-4.1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BELT-4.1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040BELT-4.1?

LM4040BELT-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040BELT-4.1 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 LM4040BELT-4.1?

For technical support, including LM4040BELT-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BELT-4.1 requirements.

6.How does Aetrix verify that LM4040BELT-4.1 is sourced from the original manufacturer or authorized distributors?

All LM4040BELT-4.1 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 LM4040BELT-4.1 meets industry standards.

7.What is the process for return or replacement of LM4040BELT-4.1?

All LM4040BELT-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BELT-4.1, 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 LM4040BELT-4.1 part is unused and in its original packaging.

Return procedure for LM4040BELT-4.1:

1.Submit a request within 90 days.

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

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