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

Texas Instruments LM4040D25QDBZT

Name: LM4040D25QDBZT
Brand: Texas Instruments
SKU: LM4040D25QDBZT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040D25QDBZT

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4040D25QDBZT.pdf

Description:: IC VREF SHUNT 1% SOT23-3

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Product details

Overview

LM4040D25QDBZT from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±25 mV (1.0%) initial tolerance at 25°C and ±63 mV (2.5%) over –40°C to 125°C, 35 μVRMS wideband noise, 0.9 Ω typical dynamic impedance, and stable operation down to 45 μA cathode current. It serves as a compact, low-drift reference in high-accuracy analog signal chains for industrial sensing and automotive control modules.

For engineers reviewing the LM4040D25QDBZT datasheet, LM4040D25QDBZT pinout, LM4040D25QDBZT application, or LM4040D25QDBZT equivalent, key selection criteria include extended-temperature-grade shunt reference performance, minimal external component requirements, compatibility with capacitive loads, and SOT-23-3 package constraints for space-constrained PCB layouts.

Technical Context

The LM4040D25QDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.5 V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves grade-D accuracy (1.0% max initial tolerance) and 150 ppm/°C max temperature coefficient over –40°C to 125°C.

It requires no output capacitor, exhibits low 35 μVRMS noise (10 Hz–10 kHz), and maintains stability under all capacitive load conditions. The device's 0.9 Ω dynamic impedance at 1 mA ensures minimal output voltage shift under varying load currents.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5 V nominal; ±25 mV (1.0%) tolerance at 25°C defines absolute accuracy for calibration-critical circuits
Temperature Coefficient	150 ppm/°C max over –40°C to 125°C; contributes ≤±63 mV drift across full range
Cathode Current Range	45 μA min to 15 mA max; enables ultra-low-power sensor biasing and high-current DAC reference use
Dynamic Impedance	0.9 Ω typical at 1 mA; limits output voltage variation to <1 mV per 1 mA load change
Wideband Noise	35 μVRMS (10 Hz–10 kHz); supports 16-bit+ ADC accuracy without additional filtering
Thermal Hysteresis	0.08% max; ensures repeatable 2.5 V output after thermal cycling between –40°C and 125°C
Long-Term Stability	120 ppm over 1000 hours; guarantees minimal drift in field-deployed instrumentation

Pinout & Package

LM4040D25QDBZT uses the 3-pin SOT-23 (DBZ) package, measuring 2.92 mm × 1.30 mm, with surface-mount compatibility and thermal resistance R_θJA = 206°C/W.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current/voltage input	Connects to regulated supply node; sinks current to establish 2.5 V reference potential
Anode (Pin 2)	Common ground reference	Must be connected to system ground; forms return path for cathode current
NC (Pin 3)	No internal connection	Float or tie to anode only in high-EMI environments per TI recommendation

Key Features

Feature	Design Value
Extended temperature operation	Rated for –40°C to +125°C ambient, enabling use in engine control units and industrial motor drives
No output capacitor required	Stable with any capacitive load; eliminates BOM cost and layout area for external stabilization
Low micropower consumption	45 μA minimum operating current allows battery-powered sensor nodes to achieve multi-year runtime
Low dynamic impedance	0.9 Ω typical ensures minimal interaction with downstream circuitry during transient load events
High ESD robustness	±2000 V HBM rating protects against handling damage during automated assembly and field service

Applications

Data-Acquisition Systems	Energy Infrastructure
Use Scenario: High-resolution ADC reference in portable multimeters and modular DAQ cards. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference voltage for SAR and sigma-delta ADCs. Use Value: Enables 16-bit effective resolution by limiting reference-induced error to <0.01% of full scale.	Use Scenario: Voltage reference in smart grid metering ICs and solar inverter monitoring circuits. IC Role / Device Role / Timing Role: Supplies precision bias for current-sense amplifiers and isolation feedback paths. Use Value: Maintains ±0.5% measurement accuracy over 125°C ambient and 10-year field life.
Analog Input Module	Field Transmitters
Use Scenario: Reference source in 4–20 mA loop-powered analog input cards for PLCs. IC Role / Device Role / Timing Role: Sets scaling voltage for programmable gain instrumentation amplifiers. Use Value: Supports 0.1% total unadjusted error (TUE) budget while consuming <60 μA quiescent current.	Use Scenario: Calibration reference in HART-enabled pressure and temperature transmitters. IC Role / Device Role / Timing Role: Anchors sensor linearization and digital-to-analog conversion in loop-powered designs. Use Value: Delivers 120 ppm long-term stability to meet NIST-traceable calibration intervals up to 2 years.

Data-Acquisition Systems

Energy Infrastructure

Use Scenario: High-resolution ADC reference in portable multimeters and modular DAQ cards.

IC Role / Device Role / Timing Role: Provides stable 2.5 V reference voltage for SAR and sigma-delta ADCs.

Use Value: Enables 16-bit effective resolution by limiting reference-induced error to <0.01% of full scale.

Use Scenario: Voltage reference in smart grid metering ICs and solar inverter monitoring circuits.

IC Role / Device Role / Timing Role: Supplies precision bias for current-sense amplifiers and isolation feedback paths.

Use Value: Maintains ±0.5% measurement accuracy over 125°C ambient and 10-year field life.

Analog Input Module

Field Transmitters

Use Scenario: Reference source in 4–20 mA loop-powered analog input cards for PLCs.

IC Role / Device Role / Timing Role: Sets scaling voltage for programmable gain instrumentation amplifiers.

Use Value: Supports 0.1% total unadjusted error (TUE) budget while consuming <60 μA quiescent current.

Use Scenario: Calibration reference in HART-enabled pressure and temperature transmitters.

IC Role / Device Role / Timing Role: Anchors sensor linearization and digital-to-analog conversion in loop-powered designs.

Use Value: Delivers 120 ppm long-term stability to meet NIST-traceable calibration intervals up to 2 years.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
REF3025AIDBZR	2.5 V, 0.2% initial accuracy, 50 ppm/°C TC, 50 μA min I_Q, SOT-23-3	Higher accuracy and lower TC, but higher minimum current and narrower temp range (–40°C to 125°C not specified for extended grade)	Select when tighter initial tolerance and lower drift are required, and system can support ≥50 μA reference current.
ADR3425ARJZ-R7	2.5 V, 0.1% initial accuracy, 10 ppm/°C TC, 100 μA min I_Q, SOT-23-5	Superior TC and accuracy, but 5-pin package, higher quiescent current, and no extended-temp qualification	Choose for metrology-grade systems where ultra-low drift dominates over power and package size constraints.

Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4040D25QDBZT trades initial accuracy and temperature coefficient for guaranteed –40°C to 125°C operation, micropower capability (45 μA min), and true 3-pin simplicity-making it optimal for ruggedized, battery-aware industrial sensors.

Availability

LM4040D25QDBZT is available at Aetrix Electronics and suitable for data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply across automotive and industrial temperature ranges.

Supply support for LM4040D25QDBZT 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, embedded processing, and connectivity technologies with decades of precision reference design heritage.

The LM4040 series was engineered for cost-sensitive, space-constrained applications demanding stable voltage references without external components-targeting industrial automation, automotive subsystems, and portable instrumentation.

FAQ

What is the maximum operating temperature for the LM4040D25QDBZT?

The LM4040D25QDBZT is characterized for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive electronics and industrial control cabinets where thermal stress is severe. This extended temperature rating is confirmed in Section 6.10 of the official TI datasheet (SLOS456Q) and distinguishes it from industrial-grade variants limited to 85°C.

Does the LM4040D25QDBZT require an output capacitor?

No, the LM4040D25QDBZT is inherently stable with all capacitive loads and does not require an external output capacitor for regulation. This is explicitly stated in the "Features" and "Description" sections of the TI datasheet and verified across all electrical test conditions-including worst-case 15 mA cathode current and full temperature range. Omitting the capacitor reduces BOM count and PCB area.

What is the minimum cathode current needed for regulation in the LM4040D25QDBZT?

The LM4040D25QDBZT requires a minimum cathode current of 45 μA at 25°C to maintain regulation, rising to 80 μA across –40°C to 125°C. This value is specified in Table 6.10 of the TI datasheet and enables ultra-low-power applications such as battery-backed sensor nodes and energy-harvesting interfaces where current budgets are sub-100 μA.

How does the LM4040D25QDBZT compare to the LM4040C25QDBZT in accuracy?

The LM4040D25QDBZT has ±25 mV (1.0%) initial tolerance at 25°C and ±63 mV (2.5%) over –40°C to 125°C, whereas the LM4040C25QDBZT offers ±12 mV (0.5%) at 25°C and ±38 mV (1.5%) over the same temperature range. Both share identical 150 ppm/°C max TC and 35 μVRMS noise, but the C-grade provides tighter initial accuracy for applications where calibration time or cost must be minimized.

Is the LM4040D25QDBZT pin-compatible with other LM4040 variants in SOT-23-3?

Yes, all LM4040x25QDBZT variants-including A, B, C, and D grades-share identical SOT-23-3 (DBZ) packaging, pinout (Cathode/Anode/NC), and footprint. This allows direct substitution within the same voltage grade (2.5 V) and temperature grade (Q = –40°C to 125°C) without PCB changes, provided the system design accommodates the selected accuracy and temperature coefficient.

LM4040D25QDBZT 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):: 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

LM4040D25QDBZT FAQ

1.How can I place an order for LM4040D25QDBZT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040D25QDBZT 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 LM4040D25QDBZT reliable?

The price and inventory of LM4040D25QDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D25QDBZT is usually 5 days.

3.What payment methods are accepted for LM4040D25QDBZT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D25QDBZT transactions.

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4.How is shipping managed for LM4040D25QDBZT?

LM4040D25QDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040D25QDBZT 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 LM4040D25QDBZT?

For technical support, including LM4040D25QDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D25QDBZT requirements.

6.How does Aetrix verify that LM4040D25QDBZT is sourced from the original manufacturer or authorized distributors?

All LM4040D25QDBZT 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 LM4040D25QDBZT meets industry standards.

7.What is the process for return or replacement of LM4040D25QDBZT?

All LM4040D25QDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D25QDBZT, 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 LM4040D25QDBZT part is unused and in its original packaging.

Return procedure for LM4040D25QDBZT:

1.Submit a request within 90 days.

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

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