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

Texas Instruments LM4041C12QDBZR

Name: LM4041C12QDBZR
Brand: Texas Instruments
SKU: LM4041C12QDBZR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4041C12QDBZR

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4041C12QDBZR.pdf

Description:: IC VREF SHUNT 0.5% SOT23-3

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Product details

Overview

LM4041C12QDBZR from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225 V output, ±0.5% initial tolerance (C grade), 100 ppm/°C max temperature coefficient, and 20 μV_RMS wideband noise. It operates from 45 μA to 12 mA cathode current and is qualified for automotive-grade extended temperature range (–40°C to +125°C), making it suitable for high-accuracy power-supply monitoring in engine control units.

For engineers reviewing the LM4041C12QDBZR datasheet, LM4041C12QDBZR pinout, LM4041C12QDBZR application, or LM4041C12QDBZR equivalent, key selection criteria include its SOT-23-3 package, no-output-capacitor-required stability, low dynamic impedance (≤1.5 Ω), and guaranteed performance across –40°C to +125°C without derating.

Technical Context

The LM4041C12QDBZR implements a trimmed Zener-based shunt architecture with fuse and Zener-zap wafer-sort trimming to achieve ±0.5% output tolerance at 25°C and ≤100 ppm/°C tempco over full temperature range. Its two-terminal configuration (cathode/anode) eliminates need for external feedback resistors or output capacitors.

It delivers stable 1.225 V reference voltage under varying load and supply conditions via low dynamic impedance (0.5–1.5 Ω) and minimal cathode current sensitivity (ΔV_Z/ΔI_Z ≤ 8 mV over 1 mA to 12 mA), enabling robust operation in battery-powered instrumentation and automotive sensor signal conditioning circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.225 V nominal; enables direct replacement of legacy 1.2 V references without resistor network redesign.
Initial Tolerance	±0.5% at 25°C (C grade); ensures system-level accuracy without post-manufacturing calibration in metering applications.
Tempco	≤100 ppm/°C over –40°C to +125°C; maintains <±1.25 mV drift across full automotive operating range.
Noise (10 Hz–10 kHz)	20 μV_RMS; supports high-resolution ADC biasing in 16-bit data-acquisition systems without added filtering.
Cathode Current Range	45 μA (min) to 12 mA (max); allows ultra-low-power wake-up circuits and high-current precision regulation in same design.
Dynamic Impedance	0.5 Ω (typ) at 1 mA; minimizes output voltage perturbation during transient load steps in power-supply monitors.
ESD Rating	±2000 V HBM; withstands handling and board assembly without additional protection circuitry.

Pinout & Package

LM4041C12QDBZR uses the SOT-23-3 (DBZ) package: 3-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.0 mm height, RoHS-compliant matte tin lead finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current sink and output node	Connects to regulated output rail; sinks all excess current from series resistor to maintain precise 1.225 V at this node.
Anode (Pin 2)	Reference ground return	Must be connected to system ground; forms the 1.225 V potential difference with cathode for shunt regulation.
NC (Pin 3)	No-connect terminal	Internally unconnected; must float or tie to anode per TI recommendation to suppress EMI coupling in noisy environments.

Key Features

Feature	Design Value
Zero-output-capacitor stability	Operates stably with any capacitive load - eliminates BOM cost and layout area for bypass capacitor in space-constrained modules.
Automotive temperature qualification	Specified and tested over –40°C to +125°C ambient - meets AEC-Q100 stress requirements for under-hood electronics.
Low micropower operation	45 μA minimum cathode current enables >10-year battery life in always-on sensor nodes powered by coin cells.
Low dynamic impedance	0.5 Ω typical at 1 mA ensures <0.5 mV output shift during 1 mA load transients - critical for closed-loop feedback stability.
Trimmed Zener core	Fuse and Zener-zap wafer-sort trimming achieves ±0.5% tolerance without laser trimming - improves yield and cost for high-volume automotive production.

Applications

Power-Supply Monitor	Automotive Engine Control Unit
Use Scenario: Real-time detection of 12 V battery rail collapse during cold cranking in vehicle infotainment systems. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V threshold for comparator-based undervoltage lockout (UVLO) circuit. Use Value: ±0.5% tolerance ensures UVLO triggers within ±6 mV of setpoint, preventing false resets during transient dips.	Use Scenario: Precision biasing of oxygen sensor amplifier in exhaust gas recirculation (EGR) control loop. IC Role / Device Role / Timing Role: Voltage reference for op-amp gain-setting network in analog front-end signal chain. Use Value: 20 μV_RMS noise avoids introducing measurable error into sub-mV sensor signals, preserving 12-bit effective resolution.
Portable Energy Meter	Industrial Process Transmitter
Use Scenario: Battery-powered smart electricity meter requiring decade-long calibration stability and low self-consumption. IC Role / Device Role / Timing Role: Primary reference for 24-bit sigma-delta ADC measuring mains voltage and current. Use Value: 100 ppm/°C tempco and 120 ppm long-term drift ensure <0.1% total error over 10 years and full temperature range.	Use Scenario: 4–20 mA loop-powered pressure transmitter operating in chemical plant environments (–40°C to +85°C). IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor Wheatstone network and ADC reference input. Use Value: Stable 1.225 V output enables <0.05% FS measurement repeatability despite wide ambient swings and long-term aging.

Power-Supply Monitor

Automotive Engine Control Unit

Use Scenario: Real-time detection of 12 V battery rail collapse during cold cranking in vehicle infotainment systems.

IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V threshold for comparator-based undervoltage lockout (UVLO) circuit.

Use Value: ±0.5% tolerance ensures UVLO triggers within ±6 mV of setpoint, preventing false resets during transient dips.

Use Scenario: Precision biasing of oxygen sensor amplifier in exhaust gas recirculation (EGR) control loop.

IC Role / Device Role / Timing Role: Voltage reference for op-amp gain-setting network in analog front-end signal chain.

Use Value: 20 μV_RMS noise avoids introducing measurable error into sub-mV sensor signals, preserving 12-bit effective resolution.

Portable Energy Meter

Industrial Process Transmitter

Use Scenario: Battery-powered smart electricity meter requiring decade-long calibration stability and low self-consumption.

IC Role / Device Role / Timing Role: Primary reference for 24-bit sigma-delta ADC measuring mains voltage and current.

Use Value: 100 ppm/°C tempco and 120 ppm long-term drift ensure <0.1% total error over 10 years and full temperature range.

Use Scenario: 4–20 mA loop-powered pressure transmitter operating in chemical plant environments (–40°C to +85°C).

IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor Wheatstone network and ADC reference input.

Use Value: Stable 1.225 V output enables <0.05% FS measurement repeatability despite wide ambient swings and long-term aging.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL4051C12QDBZR	Same 1.225 V, ±0.5%, –40°C to +125°C, but higher 35 μV_RMS noise and 2.5 Ω dynamic impedance.	Less suitable for high-resolution ADC biasing; acceptable for basic UVLO or comparator thresholds.	Select TL4051C12QDBZR only if noise and impedance specs are relaxed; LM4041C12QDBZR preferred for metrology-grade designs.
MAX6008BESA+	1.25 V output, ±0.2% (B grade), –40°C to +85°C, 25 μV_RMS noise, SC70-3 package.	Limited to industrial temp range; requires layout change due to different pinout and package size.	Choose MAX6008BESA+ only for cost-sensitive non-automotive applications where 1.25 V output is acceptable and extended temperature is not required.

Compared with TL4051C12QDBZR and MAX6008BESA+, the LM4041C12QDBZR offers superior noise (20 vs 35/25 μV_RMS) and lower dynamic impedance (0.5 Ω vs 2.5/1.2 Ω), directly improving measurement fidelity in precision analog signal chains while maintaining automotive temperature compliance.

Availability

LM4041C12QDBZR is available at Aetrix Electronics and suitable for automotive engine control, portable energy metering, industrial process transmitters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM4041C12QDBZR 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 company designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.

The LM4041 product line delivers precision shunt references optimized for low-power, high-accuracy voltage regulation in space-constrained and thermally demanding applications such as automotive sensors and portable test equipment.

FAQ

What is the maximum operating temperature for LM4041C12QDBZR?

The LM4041C12QDBZR is characterized and guaranteed over an ambient temperature range of –40°C to +125°C, meeting automotive extended-temperature requirements. This rating is validated per TI's LM4041x12Q Electrical Characteristics table (Section 5.6), where all parameters including tolerance, tempco, and dynamic impedance are specified across this full range. The device's thermal design supports continuous operation at +125°C ambient without derating when mounted on standard FR-4 PCB with recommended copper pour.

Does LM4041C12QDBZR require an output capacitor for stability?

No, LM4041C12QDBZR does not require an output capacitor for stability. As confirmed in Section 7.1 of the datasheet, it is designed to remain stable with all capacitive loads - including zero capacitance - eliminating the need for external bypass components. This simplifies layout, reduces BOM count, and improves reliability in high-vibration automotive environments where capacitor solder joints may fatigue.

What is the minimum cathode current needed for LM4041C12QDBZR to regulate properly?

The LM4041C12QDBZR requires a minimum cathode current of 45 μA (typical) at 25°C to maintain regulation, as specified in Section 5.6. Over the full –40°C to +125°C range, the guaranteed maximum I_Z,min is 80 μA. Designers must size the series resistor (R_S) to ensure this current is maintained even under worst-case conditions of minimum input voltage and maximum load current.

How does the pinout of LM4041C12QDBZR differ from adjustable versions?

The LM4041C12QDBZR uses a fixed-output 3-pin SOT-23 (DBZ) package with Cathode (Pin 1), Anode (Pin 2), and NC (Pin 3). Adjustable versions (e.g., LM4041CQDBZR) use the same DBZ package but assign Pin 1 as FB (feedback), Pin 2 as Cathode, and Pin 3 as Anode - a completely different pin mapping. Interchanging them will result in non-functional or damaged circuits; always verify pin function against the specific part number's Figure 4-1 or 4-4 in the datasheet.

Is LM4041C12QDBZR suitable for use in AEC-Q100 qualified automotive modules?

Yes, LM4041C12QDBZR is suitable for AEC-Q100 qualified modules. While the datasheet does not state "AEC-Q100 certified" explicitly, its Q-grade qualification (–40°C to +125°C), ±2000 V HBM ESD rating, and production release under TI's automotive-grade process flow meet foundational AEC-Q100 stress test requirements. System-level qualification remains the responsibility of the end customer, but LM4041C12QDBZR is widely deployed in Tier-1 automotive ECUs as a reference component.

LM4041C12QDBZR 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:: Active

Reference Type:: Shunt

Output Type:: Fixed

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

Voltage - Output (Max):: -

Current - Output:: 12 mA

Tolerance:: ±0.5%

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 ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4041C12QDBZR FAQ

1.How can I place an order for LM4041C12QDBZR through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4041C12QDBZR 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 LM4041C12QDBZR reliable?

The price and inventory of LM4041C12QDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041C12QDBZR is usually 5 days.

3.What payment methods are accepted for LM4041C12QDBZR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041C12QDBZR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4041C12QDBZR?

LM4041C12QDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4041C12QDBZR 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 LM4041C12QDBZR?

For technical support, including LM4041C12QDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041C12QDBZR requirements.

6.How does Aetrix verify that LM4041C12QDBZR is sourced from the original manufacturer or authorized distributors?

All LM4041C12QDBZR 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 LM4041C12QDBZR meets industry standards.

7.What is the process for return or replacement of LM4041C12QDBZR?

All LM4041C12QDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4041C12QDBZR, 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 LM4041C12QDBZR part is unused and in its original packaging.

Return procedure for LM4041C12QDBZR:

1.Submit a request within 90 days.

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

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