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

Texas Instruments LM4041D12QDBZTG4

Name: LM4041D12QDBZTG4
Brand: Texas Instruments
SKU: LM4041D12QDBZTG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4041D12QDBZTG4

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4041D12QDBZTG4.pdf

Description:: IC VREF SHUNT 1% SOT23-3

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Product details

Overview

LM4041D12QDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225 V output, ±1.0% initial tolerance (D grade), 150 ppm/°C max temperature coefficient, and operation across –40°C to +125°C. It delivers stable regulation for low-current analog signal chains in battery-powered instrumentation and automotive power-supply monitors.

For engineers reviewing the LM4041D12QDBZTG4 datasheet, LM4041D12QDBZTG4 pinout, LM4041D12QDBZTG4 application, or LM4041D12QDBZTG4 equivalent, key selection criteria include its guaranteed 45 μA minimum cathode current, 20 μV_RMS wideband noise, stability with all capacitive loads, and SOT-23-3 (DBZ) package compatibility with high-temperature industrial and automotive environments.

Technical Context

The LM4041D12QDBZTG4 implements a Zener-based shunt reference architecture trimmed via Zener-zap during wafer sort to achieve D-grade accuracy. Its internal circuit maintains regulation by sinking variable cathode current while holding anode at ground potential - enabling simple two-terminal configuration without external capacitors.

It operates as a 3-pin SOT-23 device where Cathode (Pin 1) supplies regulated voltage and sinks load + reference current, Anode (Pin 2) connects to system ground, and NC (Pin 3) must float or tie to Anode per EMI mitigation guidance. No feedback pin is present - confirming this is the fixed-output variant, not adjustable.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.225 V nominal; ±12 mV (±1.0%) tolerance at 25°C ensures predictable biasing in ADC references and sensor excitation circuits.
Temp Coefficient	Max 150 ppm/°C over –40°C to +125°C; guarantees ≤1.85 mV total drift across full Q-temp range for stable long-term measurements.
Cathode Current Range	45 μA (min) to 12 mA (max); supports ultra-low-power sensor nodes and robust operation under varying load conditions.
Output Noise	20 μV_RMS (10 Hz–10 kHz); enables high-resolution data acquisition without added filtering in precision analog front-ends.
Dynamic Impedance	≤2 Ω at 1 mA, 120 Hz; minimizes output voltage shift under dynamic load transients in power-monitoring applications.
Long-Term Stability	120 ppm after 1000 hours; provides predictable aging behavior for metering and industrial control systems requiring calibration longevity.

Pinout & Package

LM4041D12QDBZTG4 uses the SOT-23-3 (DBZ) surface-mount package: 2.92 mm × 1.3 mm × 1.0 mm body, gull-wing leads, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt output terminal	Sinks total current (load + reference); voltage at this node is regulated 1.225 V relative to Anode; connects to supply rail via series resistor.
Anode (Pin 2)	Reference ground return	Must be connected to system ground; serves as the 0 V reference point for output voltage; not internally tied to substrate.
NC (Pin 3)	No-connect terminal	Must remain floating or tied to Anode per TI EMI guidance; no internal connection; avoids parasitic coupling in noisy environments.

Key Features

Feature	Design Value
Capacitor-free stability	Operates stably with any capacitive load (0–∞), eliminating need for output bypass capacitor and simplifying layout in space-constrained designs.
Micropower operation	45 μA minimum cathode current enables use in always-on battery-powered devices with multi-year runtime requirements.
High-temp qualification	Rated for –40°C to +125°C ambient; validated for automotive under-hood and industrial motor-control applications without derating.
Low-noise regulation	20 μV_RMS broadband noise supports 16-bit+ ADC performance without external low-noise LDO post-regulation.
Zener-zap trimming	Fuse-based wafer-level calibration achieves tight D-grade tolerance without laser trimming, ensuring cost-effective precision.

Applications

Portable Data Loggers	Automotive Battery Monitors
Use Scenario: Continuous voltage logging of Li-ion cell stacks in wireless environmental sensors. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for successive-approximation ADCs sampling at 1 kSPS. Use Value: Enables ±0.5% measurement accuracy over temperature and 10-year field deployment due to 150 ppm/°C TC and 120 ppm long-term drift.	Use Scenario: Monitoring 12 V vehicle battery health during cold-cranking and start-stop cycles. IC Role / Device Role / Timing Role: Supplies reference to comparator-based undervoltage lockout and microcontroller ADC. Use Value: Maintains regulation down to 45 μA, allowing detection of weak-battery conditions even when main system is in deep sleep.
Industrial Process Transmitters	Energy Meter Reference Subsystem
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in factory-floor enclosures. IC Role / Device Role / Timing Role: Sets precise gain and offset in op-amp signal conditioning path before DAC-driven current output. Use Value: Delivers <2 mV total error over –40°C to +85°C, meeting IEC 61000-6-2 immunity requirements without recalibration.	Use Scenario: High-accuracy kWh meter using metrology-grade sigma-delta ADCs. IC Role / Device Role / Timing Role: Serves as primary voltage reference for both voltage and current channel ADCs in polyphase metering SoCs. Use Value: 20 μV_RMS noise and <1.5 mV load regulation error preserve EN 50470-3 Class 0.5 accuracy under varying line impedance.

Portable Data Loggers

Automotive Battery Monitors

Use Scenario: Continuous voltage logging of Li-ion cell stacks in wireless environmental sensors.

IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for successive-approximation ADCs sampling at 1 kSPS.

Use Value: Enables ±0.5% measurement accuracy over temperature and 10-year field deployment due to 150 ppm/°C TC and 120 ppm long-term drift.

Use Scenario: Monitoring 12 V vehicle battery health during cold-cranking and start-stop cycles.

IC Role / Device Role / Timing Role: Supplies reference to comparator-based undervoltage lockout and microcontroller ADC.

Use Value: Maintains regulation down to 45 μA, allowing detection of weak-battery conditions even when main system is in deep sleep.

Industrial Process Transmitters

Energy Meter Reference Subsystem

Use Scenario: 4–20 mA loop-powered pressure transmitter operating in factory-floor enclosures.

IC Role / Device Role / Timing Role: Sets precise gain and offset in op-amp signal conditioning path before DAC-driven current output.

Use Value: Delivers <2 mV total error over –40°C to +85°C, meeting IEC 61000-6-2 immunity requirements without recalibration.

Use Scenario: High-accuracy kWh meter using metrology-grade sigma-delta ADCs.

IC Role / Device Role / Timing Role: Serves as primary voltage reference for both voltage and current channel ADCs in polyphase metering SoCs.

Use Value: 20 μV_RMS noise and <1.5 mV load regulation error preserve EN 50470-3 Class 0.5 accuracy under varying line impedance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM4040D12IDBZR	Same 1.225 V, D-grade tolerance, but rated only to +85°C (I-temp); 100 ppm/°C max TC vs. 150 ppm/°C.	Not qualified for under-hood automotive or extended industrial ambient; suitable for commercial-grade portable equipment.	Select when operating temperature stays ≤85°C and lower TC is preferred.
MAX6008AEUR+T	1.225 V, ±0.5% (A-grade), 75 ppm/°C max, but requires ≥60 μA min cathode current and has higher 35 μV_RMS noise.	Better TC and tighter tolerance, but incompatible with ultra-low-power designs needing <60 μA operation.	Choose when TC and initial accuracy outweigh micropower needs and noise sensitivity.

Compared with LM4040D12IDBZR and MAX6008AEUR+T, the LM4041D12QDBZTG4 uniquely balances extended temperature support (+125°C), micropower capability (45 μA min), and low noise (20 μV_RMS) - making it optimal for automotive and industrial edge-sensing nodes where all three attributes are simultaneously required.

Availability

LM4041D12QDBZTG4 is available at Aetrix Electronics and suitable for automotive battery monitors, industrial process transmitters, and portable data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4041D12QDBZTG4 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 broad distribution infrastructure.

The LM4041 product line delivers micropower shunt references optimized for space-constrained, battery-sensitive, and high-reliability applications - including automotive, energy metering, and portable instrumentation where low quiescent current and thermal stability are critical.

FAQ

What is the maximum operating temperature for LM4041D12QDBZTG4?

The LM4041D12QDBZTG4 is characterized for operation from –40°C to +125°C ambient temperature. This Q-grade qualification makes it suitable for under-hood automotive applications and high-temperature industrial environments where standard I-grade parts (–40°C to +85°C) would fail. The device maintains specified electrical performance-including ±1.0% output tolerance and ≤150 ppm/°C temperature coefficient-throughout this full range.

Does LM4041D12QDBZTG4 require an output capacitor for stability?

No, LM4041D12QDBZTG4 does not require an output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads-from 0 pF to unlimited-eliminating the need for external bypass components. This simplifies PCB layout and reduces bill-of-materials cost, especially in compact, low-power systems like sensor nodes and portable meters where board space is constrained.

What is the minimum cathode current needed for LM4041D12QDBZTG4 to regulate properly?

The LM4041D12QDBZTG4 requires a minimum cathode current of 45 μA (typical) at 25°C to maintain regulation, with a worst-case value of 80 μA across –40°C to +125°C. This ultra-low requirement enables use in always-on, battery-powered applications such as remote IoT sensors and energy-harvesting systems where average current draw must stay below 50 μA to achieve multi-year operational life.

How is the pinout configured for LM4041D12QDBZTG4 in the SOT-23 package?

LM4041D12QDBZTG4 in the SOT-23 (DBZ) package has Cathode on Pin 1, Anode on Pin 2, and NC on Pin 3. Pin 3 must either float or connect to Pin 2 (Anode) per TI's EMI mitigation guidance. This fixed-output variant lacks a feedback pin-confirming it is not the adjustable version-and uses the standard SOT-23 top-view orientation with marking dot adjacent to Pin 1.

What is the wideband noise specification of LM4041D12QDBZTG4 and how does it impact precision ADC performance?

LM4041D12QDBZTG4 specifies 20 μV_RMS wideband noise over 10 Hz to 10 kHz. This low noise floor directly limits the effective resolution of downstream precision ADCs: for a 16-bit, 2.5 V full-scale SAR ADC, it contributes <0.13 LSB of RMS noise, preserving ENOB >15.5 bits without requiring additional low-noise LDO filtering-reducing component count and power consumption in high-fidelity data acquisition systems.

LM4041D12QDBZTG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

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

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 1.225V

Voltage - Output (Max):: -

Current - Output:: 12 mA

Tolerance:: ±1%

Temperature Coefficient:: 150ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 20µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 80 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4041D12QDBZTG4 FAQ

1.How can I place an order for LM4041D12QDBZTG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4041D12QDBZTG4 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 LM4041D12QDBZTG4 reliable?

The price and inventory of LM4041D12QDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041D12QDBZTG4 is usually 5 days.

3.What payment methods are accepted for LM4041D12QDBZTG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041D12QDBZTG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4041D12QDBZTG4?

LM4041D12QDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4041D12QDBZTG4 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 LM4041D12QDBZTG4?

For technical support, including LM4041D12QDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041D12QDBZTG4 requirements.

6.How does Aetrix verify that LM4041D12QDBZTG4 is sourced from the original manufacturer or authorized distributors?

All LM4041D12QDBZTG4 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 LM4041D12QDBZTG4 meets industry standards.

7.What is the process for return or replacement of LM4041D12QDBZTG4?

All LM4041D12QDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041D12QDBZTG4, 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 LM4041D12QDBZTG4 part is unused and in its original packaging.

Return procedure for LM4041D12QDBZTG4:

1.Submit a request within 90 days.

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

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