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

Texas Instruments LM4041B12IDCKR

Name: LM4041B12IDCKR
Brand: Texas Instruments
SKU: LM4041B12IDCKR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4041B12IDCKR

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4041B12IDCKR.pdf

Description:: IC VREF SHUNT 0.2% SC70-5

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Product details

Overview

LM4041B12IDCKR from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225 V output, ±0.2% initial tolerance (B grade), 100 ppm/°C max temperature coefficient, 20 μV_RMS wideband noise, and stable operation from 45 μA to 12 mA cathode current. It serves as a compact, low-drift reference in battery-powered instrumentation and high-accuracy power-supply monitors.

For engineers reviewing the LM4041B12IDCKR datasheet, LM4041B12IDCKR pinout, LM4041B12IDCKR application, or LM4041B12IDCKR equivalent, key selection criteria include its SC-70-5 package, industrial temperature range (–40°C to +85°C), no-output-capacitor stability, and compatibility with capacitive loads in space-constrained analog signal chains.

Technical Context

The LM4041B12IDCKR implements a Zener-based shunt reference architecture trimmed via fuse and Zener-zap during wafer sort to achieve ±0.2% output tolerance at 25°C. Its dynamic impedance remains ≤1.5 Ω at 1 mA, enabling tight regulation under varying load currents.

It operates without external compensation and maintains stability across all capacitive loads due to inherent low-output-impedance design and internal compensation. The SC-70-5 package includes dedicated feedback (FB) and no-connect (NC) terminals, supporting both fixed and adjustable configurations-though LM4041B12IDCKR is factory-configured for fixed 1.225 V output.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.225 V nominal; enables direct replacement of legacy 1.2 V references in ADC/DAC biasing and sensor excitation circuits.
Initial Tolerance	±0.2% max at 25°C (B grade); ensures system-level accuracy without post-manufacturing calibration in portable medical devices.
Temp Coefficient	≤100 ppm/°C max over –40°C to +85°C; supports stable performance in automotive cabin modules and industrial PLC analog inputs.
Noise (10 Hz–10 kHz)	20 μV_RMS typical; minimizes added noise floor in 16-bit+ data acquisition front-ends and precision audio level detectors.
Operating Current	45 μA min to 12 mA max cathode current; allows ultra-low-power sleep-mode reference retention and high-current transient response in SMPS feedback loops.
Dynamic Impedance	≤1.5 Ω at 1 mA (25°C); sustains <1 mV output deviation during 1 mA load steps, critical for closed-loop voltage monitoring.
Long-Term Stability	120 ppm after 1000 h; guarantees minimal drift in energy metering ICs requiring decade-long calibration validity.

Pinout & Package

LM4041B12IDCKR is packaged in a 5-pin SC-70 (DCK) surface-mount package measuring 2.0 mm × 2.1 mm × 0.9 mm, optimized for high-density PCB layouts and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Ground reference node; must be connected to system ground to establish shunt reference potential.
2	No Connect (NC)	Internally unconnected; must remain floating or tied to Anode per TI EMI mitigation guidance.
3	Cathode	Shunt current sink and output node; supplies regulated 1.225 V to external circuitry via series resistor.
4	No Connect (NC)	Internally unconnected; no electrical function; leave unpopulated or grounded only if required by board layout constraints.
5	Feedback (FB)	Unused in fixed-voltage variant; must float or connect to Anode to prevent leakage-induced error in B-grade precision operation.

Key Features

Feature	Design Value
Zero-output-capacitor stability	Operates stably with any capacitive load (0–∞), eliminating need for external bypass capacitor and reducing BOM count in wearables.
Micropower operation	45 μA minimum cathode current enables >10-year battery life in coin-cell-powered IoT sensors using 1.225 V reference rails.
Low-noise Zener core	20 μV_RMS noise over 10 Hz–10 kHz band preserves SNR in 24-bit delta-sigma ADCs used in strain-gauge bridge interfaces.
Wide current range	Supports 45 μA–12 mA cathode current, allowing single-part reuse across low-power standby and high-accuracy active measurement modes.
Industrial temp range	Specified from –40°C to +85°C, ensuring reliable startup and regulation in outdoor industrial gateways and motor drive control boards.

Applications

Portable Data Loggers	Industrial Power-Supply Monitors
Use Scenario: Battery-powered environmental sensor nodes logging temperature, humidity, and pressure with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for ADC full-scale calibration and sensor excitation, replacing bulkier 3-terminal references. Use Value: Enables 0.01% measurement linearity over –20°C to +70°C ambient while consuming <50 μA quiescent current.	Use Scenario: Real-time monitoring of 3.3 V and 5 V rails in programmable logic controller (PLC) backplanes. IC Role / Device Role / Timing Role: Serves as precision shunt reference in comparator-based overvoltage/undervoltage detection circuits with hysteresis. Use Value: Delivers ±0.2% trip-point accuracy across –40°C to +85°C, eliminating thermal recalibration in factory automation systems.
Precision Audio Level Detectors	Energy Metering IC Biasing
Use Scenario: RMS-to-DC converter stages in professional audio analyzers measuring signal amplitude from –80 dBu to +20 dBu. IC Role / Device Role / Timing Role: Supplies low-noise 1.225 V reference to op-amp gain stages and envelope detector comparators. Use Value: Contributes <20 μV_RMS noise floor, preserving dynamic range in 114 dB SNR audio signal paths.	Use Scenario: Biasing internal ADCs and voltage references in Class 0.2 polyphase electricity meters compliant with IEC 62053-21. IC Role / Device Role / Timing Role: Acts as primary shunt reference for metrology ASICs requiring long-term drift <200 ppm over 10 years. Use Value: Achieves 120 ppm drift after 1000 h burn-in and <100 ppm/°C tempco, meeting IEC 62053 accuracy requirements.

Portable Data Loggers

Industrial Power-Supply Monitors

Use Scenario: Battery-powered environmental sensor nodes logging temperature, humidity, and pressure with 16-bit SAR ADCs.

IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for ADC full-scale calibration and sensor excitation, replacing bulkier 3-terminal references.

Use Value: Enables 0.01% measurement linearity over –20°C to +70°C ambient while consuming <50 μA quiescent current.

Use Scenario: Real-time monitoring of 3.3 V and 5 V rails in programmable logic controller (PLC) backplanes.

IC Role / Device Role / Timing Role: Serves as precision shunt reference in comparator-based overvoltage/undervoltage detection circuits with hysteresis.

Use Value: Delivers ±0.2% trip-point accuracy across –40°C to +85°C, eliminating thermal recalibration in factory automation systems.

Precision Audio Level Detectors

Energy Metering IC Biasing

Use Scenario: RMS-to-DC converter stages in professional audio analyzers measuring signal amplitude from –80 dBu to +20 dBu.

IC Role / Device Role / Timing Role: Supplies low-noise 1.225 V reference to op-amp gain stages and envelope detector comparators.

Use Value: Contributes <20 μV_RMS noise floor, preserving dynamic range in 114 dB SNR audio signal paths.

Use Scenario: Biasing internal ADCs and voltage references in Class 0.2 polyphase electricity meters compliant with IEC 62053-21.

IC Role / Device Role / Timing Role: Acts as primary shunt reference for metrology ASICs requiring long-term drift <200 ppm over 10 years.

Use Value: Achieves 120 ppm drift after 1000 h burn-in and <100 ppm/°C tempco, meeting IEC 62053 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
LM4041C12IDCKR	±0.5% initial tolerance (C grade), same 100 ppm/°C tempco and SC-70-5 package	Acceptable where system-level calibration compensates for higher initial error, e.g., consumer-grade test equipment	Select when cost reduction outweighs need for ±0.2% tolerance; identical footprint and thermal behavior.
REF3012AIDBZR	1.2 V output, ±0.2% tolerance, but uses series topology (not shunt); 50 μA typical quiescent current; SOT-23-3 package	Requires different biasing network; unsuitable for shunt-based current-sensing topologies or high-side sensing	Choose only for series-reference architectures; not drop-in compatible due to topology and pinout mismatch.

Compared with LM4041C12IDCKR, LM4041B12IDCKR delivers tighter initial accuracy for uncalibrated systems, while REF3012AIDBZR offers lower quiescent current but mandates redesign of the reference connection topology and cannot replace LM4041B12IDCKR without circuit modification.

Availability

LM4041B12IDCKR is available at Aetrix Electronics and suitable for portable instrumentation, industrial power-supply monitors, and precision audio level detectors requiring stable component supply across extended production lifecycles.

Supply support for LM4041B12IDCKR 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

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and power management technologies.

The LM4041 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-accuracy measurement systems across industrial, automotive, and medical end equipment.

FAQ

What is the output voltage tolerance of LM4041B12IDCKR at 25°C?

The LM4041B12IDCKR has a maximum initial output voltage tolerance of ±0.2% at 25°C, corresponding to ±2.45 mV around the nominal 1.225 V output. This B-grade specification is verified across production lots and applies under standard test conditions with 100 μA cathode current. The LM4041B12IDCKR maintains this tolerance without trimming or calibration.

Does LM4041B12IDCKR require an external output capacitor?

No, LM4041B12IDCKR does not require an external output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads-from 0 pF to large bulk capacitance-eliminating the need for external bypass components. This feature simplifies layout in space-constrained applications like wearable health monitors where LM4041B12IDCKR provides the reference voltage.

What is the operating temperature range for LM4041B12IDCKR?

The LM4041B12IDCKR is characterized for operation from –40°C to +85°C (industrial temperature range). All electrical specifications-including tolerance, temperature coefficient, and dynamic impedance-are guaranteed across this full range. This makes LM4041B12IDCKR suitable for deployment in outdoor industrial controllers and automotive cabin electronics where ambient extremes are expected.

How does the noise performance of LM4041B12IDCKR compare to other shunt references?

LM4041B12IDCKR delivers 20 μV_RMS wideband noise (10 Hz to 10 kHz), which is among the lowest for micropower shunt references in its class. This noise level is confirmed in TI's characterization data and directly impacts high-resolution ADC systems. When used as the reference for a 24-bit delta-sigma converter, LM4041B12IDCKR contributes less than 0.001% of full-scale noise, preserving effective resolution better than alternatives with >35 μV_RMS noise.

Can LM4041B12IDCKR be used in adjustable-output configurations?

No, LM4041B12IDCKR is a fixed-output variant configured at 1.225 V during manufacturing and is not intended for adjustable use. While the SC-70-5 package includes a Feedback (FB) pin, TI specifies that LM4041B12IDCKR's internal trim is set for fixed operation. For adjustable designs, engineers must select part numbers ending in "I" (e.g., LM4041BI) rather than "12I", as LM4041B12IDCKR lacks the internal architecture to support external resistor-divider programming.

LM4041B12IDCKR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

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:: ±0.2%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 20µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 80 µA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-5

LM4041B12IDCKR FAQ

1.How can I place an order for LM4041B12IDCKR through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4041B12IDCKR 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 LM4041B12IDCKR reliable?

The price and inventory of LM4041B12IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041B12IDCKR is usually 5 days.

3.What payment methods are accepted for LM4041B12IDCKR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041B12IDCKR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4041B12IDCKR?

LM4041B12IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4041B12IDCKR 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 LM4041B12IDCKR?

For technical support, including LM4041B12IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041B12IDCKR requirements.

6.How does Aetrix verify that LM4041B12IDCKR is sourced from the original manufacturer or authorized distributors?

All LM4041B12IDCKR 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 LM4041B12IDCKR meets industry standards.

7.What is the process for return or replacement of LM4041B12IDCKR?

All LM4041B12IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4041B12IDCKR, 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 LM4041B12IDCKR part is unused and in its original packaging.

Return procedure for LM4041B12IDCKR:

1.Submit a request within 90 days.

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

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