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

Texas Instruments LM4040D25QDBZTG4

Name: LM4040D25QDBZTG4
Brand: Texas Instruments
SKU: LM4040D25QDBZTG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040D25QDBZTG4

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4040D25QDBZTG4.pdf

Description:: IC VREF SHUNT 1% SOT23-3

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Product details

Overview

LM4040D25QDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±1.0% initial accuracy (D grade), 150 ppm/°C temperature coefficient, 35 μV_RMS wideband noise, and operation across –40°C to 125°C. It serves as a stable voltage reference in high-accuracy analog signal chains for industrial sensors and automotive control modules.

For engineers reviewing the LM4040D25QDBZTG4 datasheet, LM4040D25QDBZTG4 pinout, LM4040D25QDBZTG4 application, or LM4040D25QDBZTG4 equivalent, key selection criteria include extended-temperature-grade shunt reference performance, low 45 μA minimum cathode current, stability with all capacitive loads, and SOT-23-3 package compatibility in space-constrained PCB layouts.

Technical Context

The LM4040D25QDBZTG4 uses Zener-zap trimming during wafer sort to achieve its 1.0% initial tolerance and is characterized over –40°C to 125°C (Q-grade). Its two-terminal shunt architecture requires only an external current-limiting resistor and functions without output capacitance.

It maintains low dynamic impedance (≤1.1 Ω at 1 mA) and exhibits thermal hysteresis of 0.08% across –40°C to 125°C cycling, supporting repeatable precision in field-deployed instrumentation and automotive ECUs where ambient extremes occur.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5 V nominal; enables direct interface with 2.5 V ADC references and rail-to-rail op-amp biasing.
Initial Accuracy	±1.0% at 25°C; defines worst-case DC offset in calibration-critical measurement front-ends.
Temp Coefficient	150 ppm/°C max; contributes ≤±0.375% error over –40°C to 125°C span, critical for unheated outdoor systems.
Min Cathode Current	45 μA typical; allows ultra-low-power operation in battery-backed data loggers and IoT sensor nodes.
Output Noise	35 μV_RMS (10 Hz–10 kHz); supports 16-bit+ resolution in precision data acquisition without added filtering.
Dynamic Impedance	≤1.1 Ω at 1 mA; ensures minimal load-regulation error when driving varying ADC input capacitance.
Operating Temp	–40°C to 125°C; qualified for under-hood automotive and industrial motor-control environments.

Pinout & Package

LM4040D25QDBZTG4 is packaged in a 3-pin SOT-23 (DBZ) case measuring 2.92 mm × 1.30 mm, optimized for high-density PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current/voltage input	Connected to supply rail via current-limiting resistor; sinks all reference current and sets operating point.
Anode (Pin 2)	Common ground node	Internally tied to system ground; forms return path for cathode current and defines reference voltage node.
NC (Pin 3)	No internal connection	Floats by default; may be tied to anode in high-EMI environments per TI recommendation to reduce noise coupling.

Key Features

Feature	Design Value
Stable with all capacitive loads	Eliminates need for output capacitor-reduces BOM count and layout sensitivity in compact designs.
Low 35 μV_RMS noise	Enables high-resolution measurements without post-reference filtering, saving board area and cost.
45 μA min cathode current	Supports operation from micro-power sources like energy harvesters or coin-cell batteries.
Extended temperature range	Validated performance from –40°C to 125°C ensures reliability in automotive engine compartments and industrial drives.
1.0% initial tolerance (D grade)	Provides cost-optimized precision for applications where tighter tolerances are unnecessary.

Applications

Industrial Sensor Transmitters	Automotive Engine Control Units
Use Scenario: 4–20 mA loop-powered field transmitter conditioning thermocouple or RTD signals in oil & gas plants. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 2.5 V基准 for ADC and DAC biasing in analog front-end. Use Value: Maintains ±0.375% total voltage error over –40°C to 125°C, enabling <±0.1% full-scale measurement accuracy without recalibration.	Use Scenario: Throttle position and manifold absolute pressure sensing in gasoline direct injection systems. IC Role / Device Role / Timing Role: Stable 2.5 V reference for microcontroller ADC sampling of sensor outputs under under-hood thermal stress. Use Value: 150 ppm/°C tempco and 0.08% thermal hysteresis ensure repeatable readings across cold-start to hot-idle cycles.
Portable Data Acquisition	Energy Infrastructure Monitoring
Use Scenario: Battery-powered handheld multimeter or power quality analyzer capturing AC waveforms. IC Role / Device Role / Timing Role: Low-noise 2.5 V shunt reference powering successive-approximation ADC reference input. Use Value: 35 μV_RMS noise and 45 μA min current enable >16-bit ENOB while extending battery life beyond 100 hours.	Use Scenario: Smart meter voltage monitoring and anti-tampering detection in utility substations. IC Role / Device Role / Timing Role: Precision reference for isolated sigma-delta ADC measuring grid voltage with Class 0.2 accuracy. Use Value: Extended-temp qualification and long-term stability (120 ppm/1000 h) support 10-year metrology compliance without field recalibration.

Industrial Sensor Transmitters

Automotive Engine Control Units

Use Scenario: 4–20 mA loop-powered field transmitter conditioning thermocouple or RTD signals in oil & gas plants.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 2.5 V基准 for ADC and DAC biasing in analog front-end.

Use Value: Maintains ±0.375% total voltage error over –40°C to 125°C, enabling <±0.1% full-scale measurement accuracy without recalibration.

Use Scenario: Throttle position and manifold absolute pressure sensing in gasoline direct injection systems.

IC Role / Device Role / Timing Role: Stable 2.5 V reference for microcontroller ADC sampling of sensor outputs under under-hood thermal stress.

Use Value: 150 ppm/°C tempco and 0.08% thermal hysteresis ensure repeatable readings across cold-start to hot-idle cycles.

Portable Data Acquisition

Energy Infrastructure Monitoring

Use Scenario: Battery-powered handheld multimeter or power quality analyzer capturing AC waveforms.

IC Role / Device Role / Timing Role: Low-noise 2.5 V shunt reference powering successive-approximation ADC reference input.

Use Value: 35 μV_RMS noise and 45 μA min current enable >16-bit ENOB while extending battery life beyond 100 hours.

Use Scenario: Smart meter voltage monitoring and anti-tampering detection in utility substations.

IC Role / Device Role / Timing Role: Precision reference for isolated sigma-delta ADC measuring grid voltage with Class 0.2 accuracy.

Use Value: Extended-temp qualification and long-term stability (120 ppm/1000 h) support 10-year metrology compliance without field recalibration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM4040C25QDBZTG4	0.5% initial accuracy, 100 ppm/°C tempco - tighter tolerance and lower drift than D grade.	Better suited for higher-accuracy industrial DAQ where calibration headroom is limited.	Select when ±0.5% initial error and reduced thermal drift justify cost premium over D grade.
TLVH431ACDBVR	Adjustable 1.24–18 V output, 0.5% accuracy, 100 ppm/°C, SOT-23-3 - programmable but less noise-immune.	Used where flexible reference voltage or feedback-loop integration is required (e.g., SMPS regulation).	Choose for adjustable-output needs; avoid if fixed 2.5 V and lowest possible noise are mandatory.

Compared with LM4040C25QDBZTG4, the LM4040D25QDBZTG4 trades accuracy and tempco for lower cost and sufficient stability in cost-sensitive automotive and industrial monitoring. Versus TLVH431ACDBVR, it offers superior noise performance and guaranteed 2.5 V output without external resistors, simplifying layout and improving repeatability.

Availability

LM4040D25QDBZTG4 is available at Aetrix Electronics and suitable for industrial sensor transmitters, automotive engine control units, and portable data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040D25QDBZTG4 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 specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and automotive-qualified components.

The LM4040 series was developed to deliver cost-effective, micropower shunt references for high-reliability industrial and automotive applications where space, power, and thermal robustness are critical constraints.

FAQ

What is the maximum operating temperature for LM4040D25QDBZTG4?

The LM4040D25QDBZTG4 is rated for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive and industrial motor-drive applications. This extended temperature range is confirmed in Section 6.10 of the official TI datasheet (SLOS456Q, April 2026 revision) and validated across all electrical characteristics including initial accuracy and tempco.

Does LM4040D25QDBZTG4 require an output capacitor?

No, the LM4040D25QDBZTG4 is stable with all capacitive loads and does not require an output capacitor for operation. This is explicitly stated in the Features section and verified in the Description and Applications sections of the TI datasheet. The device's inherent stability eliminates capacitor-related layout dependencies and reduces bill-of-materials cost.

What is the minimum cathode current needed for LM4040D25QDBZTG4 to regulate properly?

The LM4040D25QDBZTG4 requires a minimum cathode current of 45 μA (typical) at 25°C to maintain regulation, rising to 80 μA across the full –40°C to 125°C range. This value is specified in Table 6.10 of the TI datasheet and enables ultra-low-power operation in battery-backed or energy-harvesting systems without compromising reference stability.

How does the noise performance of LM4040D25QDBZTG4 compare to other shunt references?

The LM4040D25QDBZTG4 delivers 35 μV_RMS wideband noise (10 Hz–10 kHz), matching the best-in-class noise floor of the LM4040 family and outperforming many competing shunt references such as the REF3025 (50 μV_RMS). This low noise directly supports 16-bit+ effective resolution in precision data acquisition systems without additional filtering stages.

Is LM4040D25QDBZTG4 pin-compatible with other LM4040 variants in SOT-23-3?

Yes, all LM4040 variants in the DBZ (SOT-23-3) package-including LM4040D25QDBZTG4, LM4040C25QDBZTG4, and LM4040A25QDBZTG4-are pin-compatible. Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is NC (no internal connection), as defined in Figure 5-1 and Table 5-1 of the TI datasheet. This allows drop-in replacement within the same grade and voltage option.

LM4040D25QDBZTG4 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:: Discontinued at Digi-Key

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 150ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 35µVrms

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

LM4040D25QDBZTG4 FAQ

1.How can I place an order for LM4040D25QDBZTG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040D25QDBZTG4 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 LM4040D25QDBZTG4 reliable?

The price and inventory of LM4040D25QDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D25QDBZTG4 is usually 5 days.

3.What payment methods are accepted for LM4040D25QDBZTG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D25QDBZTG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040D25QDBZTG4?

LM4040D25QDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040D25QDBZTG4 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 LM4040D25QDBZTG4?

For technical support, including LM4040D25QDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D25QDBZTG4 requirements.

6.How does Aetrix verify that LM4040D25QDBZTG4 is sourced from the original manufacturer or authorized distributors?

All LM4040D25QDBZTG4 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 LM4040D25QDBZTG4 meets industry standards.

7.What is the process for return or replacement of LM4040D25QDBZTG4?

All LM4040D25QDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D25QDBZTG4, 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 LM4040D25QDBZTG4 part is unused and in its original packaging.

Return procedure for LM4040D25QDBZTG4:

1.Submit a request within 90 days.

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

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