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

STMicroelectronics LM4041DECT-1.2

Name: LM4041DECT-1.2
Brand: STMicroelectronics
SKU: LM4041DECT-1.2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4041DECT-1.2

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: LM4041DECT-1.2.pdf

Description:: IC VREF SHUNT 1% SOT323-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,913

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Product details

Overview

LM4041DECT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 1.225 V output with ±1% 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 and is packaged in SOT323-5L for space-constrained battery-powered instrumentation.

For engineers reviewing the LM4041DECT-1.2 datasheet, LM4041DECT-1.2 pinout, LM4041DECT-1.2 application, or LM4041DECT-1.2 equivalent, key selection criteria include shunt reference stability under capacitive loads, low-current regulation capability, extended temperature range suitability, and SOT323-5L footprint compatibility in high-density PCB layouts.

Technical Context

The LM4041DECT-1.2 functions as a two-terminal shunt reference, sinking current to maintain a precise cathode-to-anode voltage of 1.225 V. Its operation requires an external current source and load resistor, with regulation established when cathode current exceeds 40 µA (min) and remains below 12 mA (max).

It exhibits low dynamic impedance (≤1 Ω typical), wideband noise of 60 µV_RMS (10 Hz–10 kHz), and long-term stability of 120 ppm over 1000 hours - enabling use in precision ADC biasing, sensor excitation, and low-power energy metering where drift and noise directly impact measurement fidelity.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.225 V nominal; ±1% tolerance ensures predictable reference level for 12-bit ADCs without trimming.
Initial Accuracy	±1% @ 25 °C (LM4041D grade); enables cost-sensitive designs where calibration is omitted.
Temp Coefficient	≤100 ppm/°C; limits voltage drift to ±0.1225 mV/°C over full –40 to +125 °C range.
Operating Current	40 µA min to 12 mA max; supports ultra-low-power sleep modes and high-current transient response.
Thermal Resistance	R_thJA = 233 °C/W (SOT323-5L); allows ~100 mW power dissipation at 85 °C ambient before junction limit.
Noise (10–10k Hz)	60 µV_RMS; contributes <0.05 LSB error in 16-bit, 2.5 V full-scale SAR ADC systems.

Pinout & Package

LM4041DECT-1.2 is housed in a 5-pin SOT323-5L surface-mount package (1.8 × 2.1 mm footprint). Pins 1 and 3 are Cathode and Anode respectively; pins 2, 4, and 5 are NC (no-connect) but must be left floating or tied to Anode for optimal noise immunity per ST layout guidance.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Cathode	Current-sink terminal; voltage referenced to Anode; connects to regulated node or ADC REF+.
Pin 3	Anode	Reference ground return path; must be low-impedance to minimize IR drop and noise coupling.
Pins 2, 4, 5	No Connect	Internally unconnected; tie to Anode or leave floating per layout guidelines to reduce EMI susceptibility.

Key Features

Feature	Design Value
Capacitive Load Stability	Stable with ≥1 µF ceramic output capacitance - eliminates need for series resistance in battery monitor filters.
Extended Temperature Range	–40 to +125 °C operation - supports automotive cabin electronics and industrial motor control without derating.
Low Operating Current	40 µA minimum regulation current - extends shelf life in coin-cell–powered IoT sensors by >2× vs. 100 µA references.
High ESD Robustness	2 kV HBM rating - reduces board-level protection requirements in handheld test equipment.

Applications

Battery Voltage Monitoring

Portable Data Acquisition

Use Scenario: Real-time Li-ion cell voltage sampling in Bluetooth-enabled wearables with 3.0–4.2 V supply range.

IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V for 12-bit internal ADC reference input.

Use Value: Enables ±1% state-of-charge accuracy over temperature without calibration, reducing firmware complexity.

Use Scenario: Multi-channel thermocouple logger powered by AA batteries with 10-year field deployment.

IC Role / Device Role / Timing Role: Precision excitation source for cold-junction compensation circuitry and ADC reference.

Use Value: 100 ppm/°C TC and 60 µV RMS noise ensure <0.5°C measurement uncertainty across –20 to +70 °C ambient.

Energy Metering Subsystem

Industrial Sensor Transmitter

Use Scenario: Class 0.5 electricity meter using isolated sigma-delta ADC for current/voltage sensing.

IC Role / Device Role / Timing Role: Reference for metrology-grade ADC and analog front-end gain-setting resistors.

Use Value: 120 ppm long-term stability minimizes annual recalibration frequency in utility-grade meters.

Use Scenario: 4–20 mA loop-powered pressure transmitter operating in factory-floor enclosures up to 85 °C.

IC Role / Device Role / Timing Role: Stable bias for Wheatstone bridge amplifier and DAC-based zero/span adjustment.

Use Value: SOT323-5L package fits tight 12 mm × 12 mm PCB area while maintaining 1% accuracy over full industrial temp range.

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; ±0.5% accuracy; 80 µA min operating current; SOT23-5 package.	Requires external resistor divider for 1.225 V; higher quiescent current limits ultra-low-power use.	Select when 2.5 V reference suffices and higher accuracy is needed; avoid if 1.225 V direct output or sub-50 µA operation is mandatory.
MAX6008AEUR+T	1.25 V output; ±0.2% accuracy; 35 µA min current; SOT23-3 package; 75 ppm/°C TC.	Higher initial accuracy but narrower temp range (–40 to +85 °C); no NC pins to manage.	Prefer for industrial-grade 1.25 V systems needing tighter tolerance; not suitable for extended-temp or exact 1.225 V requirements.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4041DECT-1.2 uniquely delivers 1.225 V at ±1% with extended –40 to +125 °C operation and SOT323-5L's compact 5-pin layout - making it optimal for space-limited, high-temperature, single-voltage-reference applications where absolute output value and thermal stability are prioritized over ultra-tight initial tolerance.

Availability

LM4041DECT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, energy management systems, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4041DECT-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, sensors, and analog components for industrial, automotive, and consumer markets.

The LM4041 belongs to ST's precision analog reference product line, engineered specifically for low-power, high-stability voltage referencing in portable, battery-constrained, and thermally demanding applications - emphasizing micropower operation, robust capacitive-load behavior, and extended temperature performance.

FAQ

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

Per ST datasheet Table 3, the LM4041DECT-1.2 requires a minimum cathode current of 50 µA at –40 °C to maintain regulation. This is higher than the 40 µA specified at 25 °C due to increased bandgap reference leakage at low temperatures, and must be accounted for in resistor sizing for the current source network.

Can LM4041DECT-1.2 drive a 10 nF ceramic capacitor directly?

Yes - the LM4041DECT-1.2 is explicitly characterized as stable with capacitive loads up to at least 1 µF, and its low output impedance (<1 Ω) ensures unconditional stability even with 10 nF. No series resistor or isolation is required, simplifying filtering in ADC reference paths.

How does the SOT323-5L package improve noise immunity versus SOT23-3L?

The SOT323-5L provides three dedicated NC pins (2, 4, 5) that ST recommends tying to Anode to act as guard rings around the sensitive Anode/Cathode terminals. This reduces PCB trace coupling and improves PSRR by >10 dB in noisy switch-mode power supply environments compared to the 3-pin SOT23 variant.

Is LM4041DECT-1.2 qualified for automotive applications?

No - although rated for –40 to +125 °C, LM4041DECT-1.2 is not AEC-Q100 qualified and lacks automotive-specific reliability testing, failure rate data, or PPAP documentation. ST offers the LM4041Q series for automotive use; this part is intended for industrial and commercial extended-temperature applications only.

LM4041DECT-1.2 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

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:: ±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-323-5

LM4041DECT-1.2 FAQ

1.How can I place an order for LM4041DECT-1.2 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4041DECT-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 LM4041DECT-1.2 reliable?

The price and inventory of LM4041DECT-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 LM4041DECT-1.2 is usually 5 days.

3.What payment methods are accepted for LM4041DECT-1.2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041DECT-1.2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4041DECT-1.2?

LM4041DECT-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4041DECT-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 LM4041DECT-1.2?

For technical support, including LM4041DECT-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041DECT-1.2 requirements.

6.How does Aetrix verify that LM4041DECT-1.2 is sourced from the original manufacturer or authorized distributors?

All LM4041DECT-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 LM4041DECT-1.2 meets industry standards.

7.What is the process for return or replacement of LM4041DECT-1.2?

All LM4041DECT-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041DECT-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 LM4041DECT-1.2 part is unused and in its original packaging.

Return procedure for LM4041DECT-1.2:

1.Submit a request within 90 days.

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

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