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

STMicroelectronics LM4041AELT-1.2

Name: LM4041AELT-1.2
Brand: STMicroelectronics
SKU: LM4041AELT-1.2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4041AELT-1.2

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: LM4041AELT-1.2.pdf

Description:: IC VREF SHUNT 0.1% SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,450

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Product details

Overview

LM4041AELT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering 1.225 V ±0.1% initial accuracy at 25 °C, with ultra-low 40 µA operating current, 100 ppm/°C max temperature coefficient, and stable operation across -40 to +125 °C. It is used in battery-operated instrumentation and energy management systems where space, power budget, and long-term stability are critical.

For engineers reviewing the LM4041AELT-1.2 datasheet, LM4041AELT-1.2 pinout, LM4041AELT-1.2 application, or LM4041AELT-1.2 equivalent, key selection criteria include shunt reference accuracy under low-current bias, thermal drift performance in extended temperature environments, and SOT23-3L package compatibility with high-density PCB layouts.

Technical Context

The LM4041AELT-1.2 operates as a two-terminal shunt reference, sinking current through its cathode to maintain a precise 1.225 V across an external resistor network. Its internal bandgap core achieves ±0.1% tolerance at 25 °C and supports regulation down to 40 µA minimum cathode current.

It exhibits 60 µV_RMS wideband noise (10 Hz–10 kHz), 0.4 Ω typical static impedance, and remains stable with capacitive loads - enabling direct use in ADC reference buffers and low-noise LDO feedback paths without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.225 V ±0.1% @ 25 °C - enables high-resolution 12-bit+ ADC referencing without trimming
Operating Current	40 µA min @ 25 °C - supports >10-year battery life in coin-cell-powered sensors
Temp Coefficient	≤100 ppm/°C - ensures <±1.2 mV drift over -40 to +125 °C range
Max Cathode Voltage	8 V - allows use with 5 V or 3.3 V supply rails plus margin
Long-Term Stability	120 ppm @ 1000 hrs - guarantees minimal calibration drift in field-deployed meters
Noise (10 Hz–10 kHz)	60 µV_RMS - avoids quantization noise floor degradation in precision DAQ front-ends

Pinout & Package

LM4041AELT-1.2 is housed in a 3-pin SOT23-3L surface-mount package (JEDEC MO-178AB). Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is NC (no connect) - must be left floating or tied to Anode for improved noise immunity per layout guidelines.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Reference ground return path	Connected to system GND; forms current sink return loop with Cathode
Pin 2 (Cathode)	Regulated output node	Sinks adjustable current to hold 1.225 V across external resistor; connects to ADC REF+ or LDO feedback
Pin 3 (NC)	No-connect terminal	Must remain unconnected or tied to Pin 1 to reduce EMI susceptibility in noisy environments

Key Features

Feature	Design Value
Ultra-low quiescent current	40 µA min operation enables microamp-level system sleep modes without reference dropout
Capacitive load stability	Stable with ≥1 µF ceramic output capacitance - eliminates need for series resistance in filtering networks
Extended temperature range	Specified from -40 to +125 °C - qualified for under-hood automotive energy monitors and industrial motor drives
Low output impedance	0.4 Ω typical static impedance - minimizes voltage error under dynamic load transients in closed-loop regulators

Applications

Battery-Powered Data Loggers

Industrial Energy Meters

Use Scenario: Continuous voltage monitoring of Li-ion cells in remote environmental sensors with 10-year battery life target.

IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V for 16-bit SAR ADC conversion of cell voltage and temperature.

Use Value: 40 µA operating current extends battery runtime; ±0.1% accuracy ensures <±1 LSB error across full temperature range.

Use Scenario: Revenue-grade kWh measurement in DIN-rail mounted smart meters deployed in substations.

IC Role / Device Role / Timing Role: Precision reference for metrology-grade sigma-delta ADCs measuring grid voltage and current waveforms.

Use Value: 100 ppm/°C tempco and 120 ppm long-term drift meet IEC 62053-21 Class 0.2 accuracy requirements.

Portable Medical Instrumentation

Automotive Body Control Modules

Use Scenario: Handheld blood glucose analyzers requiring clinical-grade analog front-end stability.

IC Role / Device Role / Timing Role: Reference source for potentiostat circuitry and biosensor signal conditioning.

Use Value: 60 µV_RMS noise prevents signal-to-noise degradation in sub-mV electrochemical measurements.

Use Scenario: Cabin temperature and humidity sensing nodes in vehicles operating across -40 to +125 °C ambient.

IC Role / Device Role / Timing Role: Voltage reference for microcontroller ADC inputs reading NTC thermistors and capacitive RH sensors.

Use Value: Extended temperature qualification and low drift ensure consistent sensor calibration without field recalibration.

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	2.5 V fixed output; 80 µA min cathode current; ±0.5% initial accuracy	Requires external resistor divider to scale down to 1.225 V; higher current draw reduces battery life	Select when 2.5 V reference is acceptable and board space permits resistor network
MAX6008AEUR+T	1.25 V output; ±0.2% accuracy; 35 µA max quiescent current; SOT23-3	Slightly lower output voltage and looser tolerance; not rated for +125 °C operation	Prefer for cost-sensitive consumer devices operating only up to +85 °C

Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4041AELT-1.2 uniquely combines 1.225 V output, ±0.1% accuracy, 40 µA operation, and +125 °C rating - making it optimal for high-precision, extended-temperature, battery-constrained applications where reference voltage cannot be scaled or trimmed.

Availability

LM4041AELT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, industrial energy meters, portable medical instrumentation, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LM4041AELT-1.2 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 LM4041 product line delivers precision shunt references optimized for ultra-low-power, high-accuracy applications including portable instrumentation, energy metering, and extended-temperature industrial control systems.

FAQ

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

At -40 °C, the LM4041AELT-1.2 requires a minimum cathode current of 50 µA to maintain regulation within specification. This is higher than the 40 µA typical value at 25 °C due to increased bandgap core leakage at low temperatures, as confirmed in Table 3 of the datasheet.

Can LM4041AELT-1.2 drive a 100 nF bypass capacitor directly?

Yes - the LM4041AELT-1.2 is explicitly characterized for stability with capacitive loads up to at least 1 µF, per datasheet Section 1 and Figure 4. A 100 nF ceramic capacitor improves high-frequency PSRR and reduces noise without risk of oscillation or regulation loss.

Is the NC pin (Pin 3) electrically isolated or internally connected?

Pin 3 is a true no-connect terminal with no internal connection to any die structure. ST's datasheet mandates it be left floating or tied to Pin 1 (Anode) solely to reduce PCB trace antenna effects and improve noise immunity - not for electrical functionality.

How does long-term stability impact calibration intervals in field-deployed meters?

With 120 ppm drift over 1000 hours (≈6 weeks), LM4041AELT-1.2 contributes less than 0.012% error after one year of continuous operation. This enables annual calibration cycles in utility-grade energy meters, reducing maintenance cost and downtime versus references with >500 ppm/year drift.

LM4041AELT-1.2 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):: 1.225V

Voltage - Output (Max):: -

Current - Output:: 12 mA

Tolerance:: ±0.1%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 60µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 50 µA

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4041AELT-1.2 FAQ

1.How can I place an order for LM4041AELT-1.2 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4041AELT-1.2 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 LM4041AELT-1.2 reliable?

The price and inventory of LM4041AELT-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041AELT-1.2 is usually 5 days.

3.What payment methods are accepted for LM4041AELT-1.2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041AELT-1.2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4041AELT-1.2?

LM4041AELT-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4041AELT-1.2 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 LM4041AELT-1.2?

For technical support, including LM4041AELT-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041AELT-1.2 requirements.

6.How does Aetrix verify that LM4041AELT-1.2 is sourced from the original manufacturer or authorized distributors?

All LM4041AELT-1.2 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 LM4041AELT-1.2 meets industry standards.

7.What is the process for return or replacement of LM4041AELT-1.2?

All LM4041AELT-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041AELT-1.2, 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 LM4041AELT-1.2 part is unused and in its original packaging.

Return procedure for LM4041AELT-1.2:

1.Submit a request within 90 days.

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

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