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

STMicroelectronics LM4041BELT-1.2

Name: LM4041BELT-1.2
Brand: STMicroelectronics
SKU: LM4041BELT-1.2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4041BELT-1.2

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: LM4041BELT-1.2.pdf

Description:: IC VREF SHUNT 0.2% SOT23-3

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Product details

Overview

LM4041BELT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering 1.225 V nominal output with ±0.2% initial accuracy at 25 °C, 100 ppm/°C max temperature coefficient, and ultra-low 40 µA operating current. It operates across –40 to +125 °C (extended temperature range) in SOT23-3L package and serves as a stable reference in space-constrained, low-power analog signal chains.

For engineers reviewing the LM4041BELT-1.2 datasheet, LM4041BELT-1.2 pinout, LM4041BELT-1.2 application, or LM4041BELT-1.2 equivalent, key selection criteria include shunt reference stability under capacitive loads, minimum cathode current requirement (50 µA at –40 °C), thermal drift performance, and compatibility with battery-operated or energy-harvesting systems requiring long-term voltage accuracy.

Technical Context

The LM4041BELT-1.2 functions 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 ±0.2% tolerance and 100 ppm/°C TC without external trimming, enabling direct use in feedback loops of DC-DC converters and sensor signal conditioning.

Designed for operation with capacitive loads up to 1 µF, it avoids oscillation in high-impedance bias networks. The SOT23-3L package supports surface-mount assembly in compact power management subsystems where thermal resistance (R_thJA = 248 °C/W) and junction temperature limits (T_JMAX = +150 °C) are critical design constraints.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.225 V nominal; ±0.2% initial accuracy ensures ≤2.45 mV absolute error at 25 °C for calibration-critical circuits
Operating Current	40 µA typical at 25 °C; minimum 50 µA over full –40 to +125 °C range enables ultra-low-power battery monitoring
Temp Coefficient	≤100 ppm/°C max; contributes ≤0.1225 mV/°C drift, supporting stable ADC reference in wide-temperature industrial sensors
Static Impedance	0.4–1 Ω; low dynamic impedance maintains regulation during load transients in SMPS feedback paths
Long-Term Stability	120 ppm over 1000 hrs; predictable aging behavior simplifies lifetime accuracy budgeting in metering applications
Wideband Noise	60 µV_RMS (10 Hz–10 kHz); low noise floor preserves SNR in precision data acquisition front-ends
Max Cathode Voltage	8 V; allows use with 5 V or 3.3 V supply rails plus headroom for transient suppression

Pinout & Package

LM4041BELT-1.2 is housed in a 3-pin SOT23-3L surface-mount package (JEDEC TO-236AB). Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is NC (no connect) - left floating or tied to Anode per layout guidelines to improve noise immunity.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Reference ground node	Connected to system ground; forms return path for cathode current and defines reference potential
Pin 2 (Cathode)	Regulated output terminal	Sinks current to maintain 1.225 V between Cathode and Anode; connects to top of external divider or load
Pin 3 (NC)	No-connect terminal	Must be left floating or tied to Pin 1 (Anode) to reduce PCB trace coupling and improve EMI rejection

Key Features

Feature	Design Value
Capacitive-load stability	Stable with up to 1 µF output capacitance-enables direct integration with filtering caps in noisy power domains
Extended temperature operation	Rated from –40 to +125 °C-supports under-hood automotive modules and industrial motor drives without derating
Low thermal resistance	R_thJA = 248 °C/W in SOT23-3L-permits >1 mA cathode current at ambient up to +85 °C without exceeding T_JMAX
ESD robustness	2 kV HBM rating-reduces risk of field failure during handling and board assembly
ECOPACK® compliance	Meets RoHS and halogen-free requirements-supports green manufacturing and global market access

Applications

Battery Voltage Monitoring

Switch-Mode Power Supply Feedback

Use Scenario: Real-time cell voltage sampling in lithium-ion battery packs for state-of-charge estimation.

IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V reference for ADC input scaling and comparator thresholds.

Use Value: ±0.2% accuracy and 100 ppm/°C TC ensure <±5 mV total error over –20 to +60 °C, meeting BMS safety margin requirements.

Use Scenario: Precision feedback node in isolated flyback or buck-boost converters for telecom power supplies.

IC Role / Device Role / Timing Role: Cathode-connected to optocoupler LED anode; regulates output voltage via secondary-side error amplification.

Use Value: Low 40 µA operating current minimizes standby loss; capacitive-load stability eliminates need for damping networks.

Data Acquisition Reference

Portable Instrumentation Biasing

Use Scenario: Reference source for 16-bit SAR ADCs in handheld multimeters and environmental sensors.

IC Role / Device Role / Timing Role: Two-terminal shunt reference replacing series references to reduce quiescent current in battery-powered designs.

Use Value: 60 µV_RMS broadband noise and 0.4 Ω impedance preserve effective resolution and linearity across full input range.

Use Scenario: Bias voltage generation for op-amp input stages and sensor excitation in portable gas analyzers.

IC Role / Device Role / Timing Role: Provides low-drift, low-noise 1.225 V reference for ratiometric sensor interfaces and offset calibration.

Use Value: 120 ppm long-term stability reduces recalibration frequency; SOT23-3L footprint saves PCB area in compact enclosures.

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 min), ±0.5% initial accuracy, 300 ppm/°C TC, 80 µA min current	Requires external resistors to set 1.225 V; higher TC increases drift in wide-temp environments	Select when adjustable reference or higher output voltage is needed; avoid if fixed 1.225 V and low TC are mandatory
MAX6008AEUR+T	Fixed 1.225 V, ±0.1% accuracy, 75 ppm/°C TC, but SOT23-5 package with enable pin	Includes shutdown control; extra pin adds routing complexity and requires logic-level enable signal	Choose for power-gated systems needing on-demand reference activation; not drop-in due to pin count and control interface

Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4041BELT-1.2 offers the optimal balance of fixed 1.225 V output, ±0.2% accuracy, 100 ppm/°C TC, and true 3-pin simplicity-making it ideal for cost-sensitive, space-constrained, and thermally demanding shunt reference roles without enable or adjustment overhead.

Availability

LM4041BELT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, switch-mode power supplies, and data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4041BELT-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 microcontrollers, power ICs, analog components, and MEMS sensors for industrial, automotive, and consumer markets.

The LM4041 belongs to ST's precision analog reference product line, engineered specifically for low-power, high-accuracy voltage referencing in space-constrained and thermally variable applications such as portable instrumentation and energy management systems.

FAQ

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

The LM4041BELT-1.2 requires a minimum cathode current of 50 µA over the full –40 to +125 °C operating range. This value is specified in Table 3 of the datasheet and ensures stable regulation even at the lowest temperature extreme, critical for cold-environment battery monitoring and outdoor sensor nodes.

Can LM4041BELT-1.2 drive a 1 µF capacitor directly without oscillation?

Yes-ST's datasheet explicitly confirms stability with up to 1 µF capacitive loads (Figure 4). This eliminates the need for series damping resistors in applications like SMPS feedback filters or ADC reference decoupling, reducing BOM count and PCB area while maintaining loop stability.

How does the SOT23-3L package affect thermal performance in continuous operation?

The SOT23-3L package has a junction-to-ambient thermal resistance (R_thJA) of 248 °C/W. At 1 mA cathode current and 8 V max cathode voltage, power dissipation remains below 8 mW, resulting in <2°C junction rise above ambient-well within safe margins for continuous operation at +85 °C ambient.

Is LM4041BELT-1.2 qualified for automotive applications?

No-LM4041BELT-1.2 is rated for extended industrial temperature (–40 to +125 °C) but is not AEC-Q100 qualified. ST offers automotive-grade variants (e.g., LM4041xQxx) with additional stress testing and PPAP documentation; this part is intended for industrial, computing, and consumer equipment only.

LM4041BELT-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:: ±0.2%

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

LM4041BELT-1.2 FAQ

1.How can I place an order for LM4041BELT-1.2 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4041BELT-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 LM4041BELT-1.2 reliable?

The price and inventory of LM4041BELT-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 LM4041BELT-1.2 is usually 5 days.

3.What payment methods are accepted for LM4041BELT-1.2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041BELT-1.2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4041BELT-1.2?

LM4041BELT-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4041BELT-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 LM4041BELT-1.2?

For technical support, including LM4041BELT-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041BELT-1.2 requirements.

6.How does Aetrix verify that LM4041BELT-1.2 is sourced from the original manufacturer or authorized distributors?

All LM4041BELT-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 LM4041BELT-1.2 meets industry standards.

7.What is the process for return or replacement of LM4041BELT-1.2?

All LM4041BELT-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041BELT-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 LM4041BELT-1.2 part is unused and in its original packaging.

Return procedure for LM4041BELT-1.2:

1.Submit a request within 90 days.

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

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