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

STMicroelectronics LM4041DICT-1.2

Name: LM4041DICT-1.2
Brand: STMicroelectronics
SKU: LM4041DICT-1.2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4041DICT-1.2

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: LM4041DICT-1.2.pdf

Description:: IC VREF SHUNT 1% SOT323-5

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Inventory:1,617

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Product details

Overview

LM4041DICT-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 +85 °C in SOT323-5L package and serves as a compact, low-power reference in battery-operated instrumentation and energy management systems.

For engineers reviewing the LM4041DICT-1.2 datasheet, LM4041DICT-1.2 pinout, LM4041DICT-1.2 application, or LM4041DICT-1.2 equivalent, key selection criteria include shunt reference stability under capacitive loads, thermal drift performance in industrial temperature range, and compatibility with space-constrained PCB layouts using SOT323-5L footprint.

Technical Context

The LM4041DICT-1.2 functions as a two-terminal shunt reference, regulating voltage by sinking adjustable cathode current (40 µA to 12 mA) while maintaining 1.225 V across its terminals. Its internal bandgap core achieves ±1% tolerance and 100 ppm/°C max TC without external trimming.

Designed for direct replacement of Zener diodes in low-power analog circuits, it exhibits stable operation with capacitive loads up to 1 µF and maintains <1.5 mV output variation over full operating current range (40 µA–12 mA) and temperature (-40 to +85 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.225 V nominal; ±1% tolerance at 25 °C ensures predictable biasing in ADC references and sensor excitation circuits.
Operating Current	40 µA min @ 25 °C; enables operation in ultra-low-power systems such as coin-cell-powered data loggers.
Temp Coefficient	≤100 ppm/°C; limits voltage drift to <1.2 mV over -40 to +85 °C, critical for precision measurement front-ends.
Load Regulation	≤10 mV change over 1 mA to 12 mA cathode current; supports stable reference under varying load conditions.
Thermal Resistance	R_thJA = 233 °C/W (SOT323-5L); defines maximum power dissipation limit (536 mW) at ambient 25 °C.
Noise (10–10 kHz)	60 µV_RMS; low broadband noise preserves signal integrity in high-resolution analog-to-digital conversion.

Pinout & Package

LM4041DICT-1.2 is housed in a 5-pin SOT323-5L surface-mount package. Pins 2, 4, and 5 must be left floating or tied to the Anode (pin 1) to improve noise immunity per PCB layout guidelines.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Reference ground terminal	Connected to system ground; forms return path for cathode current and establishes reference potential.
Pin 3 (Cathode)	Reference output terminal	Sinks regulated current to maintain 1.225 V between Cathode and Anode; connects to feedback node of regulator or ADC reference input.
Pins 2, 4, 5	No-connect (NC) / Noise guard	Must be left floating or shorted to Pin 1 to reduce EMI susceptibility and improve long-term stability in noisy environments.

Key Features

Feature	Design Value
Fixed 1.225 V output	Eliminates need for external resistor dividers in low-voltage reference designs, reducing BOM count and board area.
Stable with capacitive loads	Operates reliably with up to 1 µF bypass capacitance-enables robust filtering without oscillation risk in SMPS feedback paths.
Industrial temperature range	Guaranteed performance from -40 to +85 °C supports deployment in factory automation and outdoor metering equipment.
Low 40 µA operating current	Extends battery life in portable instrumentation; allows use in always-on monitoring nodes powered by primary lithium cells.

Applications

Battery Charger Feedback

Portable Data Acquisition

Use Scenario: Precision voltage sensing in single-cell Li-ion charger IC feedback loop to regulate charge termination voltage.

IC Role / Device Role / Timing Role: Shunt reference providing accurate 1.225 V reference for error amplifier comparison against sensed battery voltage.

Use Value: ±1% initial accuracy and 100 ppm/°C TC ensure ≤10 mV total error over temperature, enabling tight ±0.5% charge voltage control.

Use Scenario: Reference source for 12-bit SAR ADC in handheld environmental sensor node powered by CR2032 coin cell.

IC Role / Device Role / Timing Role: Low-current shunt reference supplying stable 1.225 V to ADC VREF pin with minimal quiescent draw.

Use Value: 40 µA operating current extends battery runtime beyond 2 years in sleep-dominated duty cycle (10 s/sampling).

Energy Management System

Industrial Instrumentation

Use Scenario: Voltage reference for current-sense amplifier in smart electricity meter's real-time power calculation engine.

IC Role / Device Role / Timing Role: Stable shunt reference enabling accurate gain calibration of isolated current sensing circuitry.

Use Value: 60 µV_RMS broadband noise and <1.5 mV load regulation minimize measurement uncertainty in sub-1% energy billing accuracy.

Use Scenario: Reference for RTD bridge excitation and signal conditioning in DIN-rail mounted temperature transmitter.

IC Role / Device Role / Timing Role: Precision shunt reference establishing known excitation current through 100 Ω Pt100 sensor.

Use Value: 100 ppm/°C TC contributes <0.05 °C error over -40 to +85 °C ambient, meeting Class A RTD accuracy requirements.

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 (1.24–18 V), 2% initial accuracy, 90 ppm/°C TC, 80 µA min operating current	Requires external resistors to set 1.225 V; higher current draw reduces battery life in ultra-low-power designs	Select when programmability or higher voltage output is needed; avoid if fixed 1.225 V and <50 µA operation are mandatory.
MAX6008AEUR+T	Fixed 1.25 V output, ±0.2% accuracy, 75 ppm/°C TC, 35 µA operating current, SOT23-3 package	0.025 V higher nominal output requires circuit recalibration; smaller 3-pin footprint lacks NC pins for noise guarding	Choose for tighter accuracy and lower current where 1.25 V is acceptable and board-level noise immunity is less critical.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4041DICT-1.2 offers optimal trade-off of fixed 1.225 V output, industrial temp range, and proven noise immunity via dedicated NC pins-making it preferred for cost-sensitive, space-constrained, and EMI-prone instrumentation designs.

Availability

LM4041DICT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, energy management systems, and industrial instrumentation requiring stable component supply with consistent parametric performance across production lots.

Supply support for LM4041DICT-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, analog ICs, power devices, and MEMS sensors for industrial, automotive, and consumer markets.

The LM4041 series belongs to ST's precision analog portfolio, engineered specifically for low-power, high-stability voltage referencing in space- and energy-constrained applications-from portable medical devices to smart grid infrastructure.

FAQ

What is the maximum cathode current the LM4041DICT-1.2 can safely sink?

The LM4041DICT-1.2 supports a maximum reverse breakdown current (I_K) of 20 mA per absolute maximum ratings. However, for reliable long-term operation within specifications, the recommended maximum operating current is 12 mA-ensuring thermal rise remains within safe limits and output voltage stability is maintained across temperature.

Can LM4041DICT-1.2 be used with ceramic bypass capacitors?

Yes-LM4041DICT-1.2 is explicitly characterized for stable operation with capacitive loads up to 1 µF, including X7R and C0G ceramic types. This eliminates need for series resistance or damping networks, simplifying layout in switch-mode power supply feedback and ADC reference circuits.

How does the SOT323-5L package improve noise immunity compared to 3-pin alternatives?

The SOT323-5L package provides three dedicated no-connect (NC) pins (2, 4, 5) that can be tied to the anode to form a grounded guard ring around the active terminals. This configuration reduces parasitic coupling and improves PSRR by >20 dB in high-noise industrial environments, unlike standard 3-pin shunt references lacking such shielding capability.

Is LM4041DICT-1.2 qualified for extended temperature operation?

No-LM4041DICT-1.2 is specified only for the industrial temperature range (-40 to +85 °C). For operation up to +125 °C, ST offers the LM4041DECT-1.2 variant (same 1% accuracy, SOT323-5L package), which is fully characterized and guaranteed across the extended range.

LM4041DICT-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 ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323-5

LM4041DICT-1.2 FAQ

1.How can I place an order for LM4041DICT-1.2 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4041DICT-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 LM4041DICT-1.2 reliable?

The price and inventory of LM4041DICT-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 LM4041DICT-1.2 is usually 5 days.

3.What payment methods are accepted for LM4041DICT-1.2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041DICT-1.2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4041DICT-1.2?

LM4041DICT-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4041DICT-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 LM4041DICT-1.2?

For technical support, including LM4041DICT-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041DICT-1.2 requirements.

6.How does Aetrix verify that LM4041DICT-1.2 is sourced from the original manufacturer or authorized distributors?

All LM4041DICT-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 LM4041DICT-1.2 meets industry standards.

7.What is the process for return or replacement of LM4041DICT-1.2?

All LM4041DICT-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041DICT-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 LM4041DICT-1.2 part is unused and in its original packaging.

Return procedure for LM4041DICT-1.2:

1.Submit a request within 90 days.

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

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