Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics LM4040CELT-4.1

Name: LM4040CELT-4.1
Brand: STMicroelectronics
SKU: LM4040CELT-4.1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LM4040CELT-4.1

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-70, SOT-323

Datasheet:: LM4040CELT-4.1.pdf

Description:: IC VREF SHUNT 4.096V SC70

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,435

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LM4040CELT-4.1 from STMicroelectronics is a precision micropower shunt voltage reference with 4.096 V nominal output, ±0.5% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, and 10 µA typical operating current. It operates across –40 to +125 °C and delivers ultra-low 10 µV_p-p low-frequency noise-ideal for high-resolution ADC biasing in portable data acquisition systems.

For engineers reviewing the LM4040CELT-4.1 datasheet, LM4040CELT-4.1 pinout, LM4040CELT-4.1 application, or LM4040CELT-4.1 equivalent, key selection criteria include shunt reference stability under capacitive loads, thermal hysteresis (120 ppm), dynamic impedance (0.15–0.3 Ω), minimum regulation current (20 µA at Vk > 3.0 V), and SOT23-3L package compatibility with space-constrained PCB layouts.

Technical Context

The LM4040CELT-4.1 functions as a two-terminal shunt reference, sinking current to maintain a stable 4.096 V cathode-to-anode voltage. Its bandgap-based core achieves 20–70 ppm/°C tempco over –40 to +125 °C and supports regulation with load currents from 20 µA to 15 mA.

It exhibits 0.2–4 mV output variation across its full operating current range and maintains stability with up to 1 µF capacitive loads-verified via stability plane analysis. The device's 95 µV_RMS wideband noise (10 Hz–10 kHz) and 10 µV_p-p low-frequency noise (0.1–10 Hz) enable use in 16-bit+ SAR and delta-sigma ADC references without external filtering.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V nominal; ±0.5% tolerance at 25 °C ensures ≤20.5 mV absolute error in precision DAC/ADC reference rails.
Initial Accuracy	±0.5% (LM4040C grade); guarantees worst-case 20.5 mV deviation at room temperature before thermal drift.
Tempco	≤70 ppm/°C; contributes ≤0.285 V drift over –40 to +125 °C ambient, critical for industrial sensor front-ends.
Operating Current	20 µA min to 15 mA max; enables ultra-low-power operation in battery-backed systems while supporting high-current loads.
Low-Freq Noise	10 µV_p-p (0.1–10 Hz); avoids LSB errors in 16-bit (≈63 µV LSB) and 18-bit (≈15.7 µV LSB) converters.
Dynamic Impedance	0.15–0.3 Ω; minimizes output voltage shift under transient load changes, improving PSRR in noisy supply environments.
Thermal Hysteresis	120 ppm; introduces ≤0.49 mV hysteresis after thermal cycling-essential for repeatable calibration in test equipment.

Pinout & Package

SOT23-3L package: 3-pin surface-mount, 1.12 mm height, 2.90 mm length, 2.64 mm width; optimized for high-density PCBs with minimal footprint (2.8 mm × 2.1 mm).

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Reference Output Node	Connected to load and feedback network; sinks current to regulate 4.096 V between Cathode and Anode.
2 (Anode)	Ground Reference Terminal	Common return path; must be low-impedance to avoid ground bounce-induced reference error.
3 (NC)	No-Connect Terminal	Internally unconnected; must remain floating or tied to Anode per datasheet guidance to prevent parametric shift.

Key Features

Feature	Design Value
Capacitive Load Stability	Stable with up to 1 µF output capacitance-eliminates need for series resistance in ADC decoupling networks.
Micropower Operation	10 µA typical quiescent current enables >10-year battery life in coin-cell-powered IoT sensors.
Industrial Temp Range	–40 to +125 °C operation supports deployment in automotive engine control units and factory-floor PLC modules.
Low Thermal Hysteresis	120 ppm hysteresis ensures repeatable voltage output after thermal cycling-critical for metrology-grade calibration tools.
High ESD Robustness	2 kV HBM rating protects against handling damage during manual assembly and rework.

Applications

Portable Data Loggers

Industrial Sensor Signal Chains

Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure at 1-second intervals for 5+ years.

IC Role / Device Role / Timing Role: Shunt reference for 16-bit SAR ADC and low-power microcontroller VREF input.

Use Value: 10 µA operating current extends CR2032 battery life beyond 10 years; 4.096 V output matches standard 12-bit ADC full-scale binary scaling.

Use Scenario: 4–20 mA loop-powered pressure transmitters in oil & gas refineries with ambient temperatures up to +125 °C.

IC Role / Device Role / Timing Role: Precision voltage reference for current-loop DAC and RTD bridge excitation.

Use Value: 70 ppm/°C tempco limits reference drift to <0.3% FS over operating range; SOT23-3L withstands reflow and vibration stress.

Medical Wearable ECG Front-Ends

Automotive Battery Management Systems

Use Scenario: Ultra-low-noise analog front-end for single-lead ECG acquisition in patch-style wearables.

IC Role / Device Role / Timing Role: Low-noise reference for instrumentation amplifier gain-setting and ADC biasing.

Use Value: 10 µV_p-p LF noise prevents baseline wander artifacts; 95 µV_RMS broadband noise avoids digitization of physiological signal harmonics.

Use Scenario: Cell voltage monitoring in 12S Li-ion BMS modules operating near engine compartments.

IC Role / Device Role / Timing Role: Stable reference for 14-bit delta-sigma ADC measuring 3.0–4.2 V cell voltages.

Use Value: ±0.5% accuracy ensures <21 mV absolute cell voltage error; 120 ppm hysteresis prevents false overvoltage trips after thermal cycling.

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 output (2.5 V base), 0.5% initial accuracy, 100 ppm/°C tempco, 80 µA min current.	Requires external resistor divider; higher min current increases power in ultra-low-power designs.	Choose when adjustable reference voltage is needed and board space allows for two resistors.
MAX6008AEUR+T	Fixed 4.096 V, 0.2% accuracy, 30 ppm/°C tempco, 35 µA min current, SOT23-3.	Higher accuracy and lower tempco but 1.75× higher min current limits battery life in µA-level systems.	Prefer for metrology-grade instruments where 0.2% accuracy outweighs 15 µA current penalty.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040CELT-4.1 offers the lowest operating current (20 µA min) and smallest footprint among fixed 4.096 V shunt references-making it optimal for space- and power-constrained embedded sensors where absolute accuracy is secondary to longevity and stability.

Availability

LM4040CELT-4.1 is available at Aetrix Electronics and suitable for portable data loggers, industrial sensor signal chains, medical wearable ECG front-ends, and automotive battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040CELT-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 belongs to ST's precision analog portfolio, engineered specifically for high-accuracy, low-power voltage referencing in harsh-environment measurement systems where stability, noise, and thermal performance are non-negotiable.

FAQ

What is the minimum cathode current required for regulation at 4.096 V output?

The LM4040CELT-4.1 requires a minimum cathode current of 20 µA at 25 °C for reliable regulation at 4.096 V output. At full temperature range (–40 to +125 °C), this increases to 25 µA to ensure stable operation under worst-case conditions, as specified in Table 3 of DS13886 Rev 4.

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

Yes-the Pin 3 (NC) terminal in the SOT23-3L package is internally unconnected and may be left floating. However, STMicroelectronics explicitly permits connecting it to the Anode (Pin 2) if routing constraints require it; doing so introduces no electrical or parametric impact per Figure 1 and associated note in DS13886 Rev 4.

How does the LM4040CELT-4.1 perform with capacitive loads?

The LM4040CELT-4.1 remains stable with output capacitances up to 1 µF, as confirmed by Figure 11 (Stability Plane vs. C_OUT) in DS13886 Rev 4. Unlike many shunt references, it requires no series damping resistor-even with 100 nF to 1 µF ceramic capacitors-making it ideal for direct ADC decoupling without added components or board area.

Is the LM4040CELT-4.1 RoHS-compliant and halogen-free?

Yes-LM4040CELT-4.1 is manufactured in STMicroelectronics' ECOPACK2-compliant SOT23-3L package, 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 official product page and ECOPACK portal at www.st.com.

LM4040CELT-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:: ±0.5%

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-4.1 FAQ

1.How can I place an order for LM4040CELT-4.1 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040CELT-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 LM4040CELT-4.1 reliable?

The price and inventory of LM4040CELT-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 LM4040CELT-4.1 is usually 5 days.

3.What payment methods are accepted for LM4040CELT-4.1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CELT-4.1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040CELT-4.1?

LM4040CELT-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040CELT-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 LM4040CELT-4.1?

For technical support, including LM4040CELT-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CELT-4.1 requirements.

6.How does Aetrix verify that LM4040CELT-4.1 is sourced from the original manufacturer or authorized distributors?

All LM4040CELT-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 LM4040CELT-4.1 meets industry standards.

7.What is the process for return or replacement of LM4040CELT-4.1?

All LM4040CELT-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CELT-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 LM4040CELT-4.1 part is unused and in its original packaging.

Return procedure for LM4040CELT-4.1:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…