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

Texas Instruments LM4040A25IDBZT

Name: LM4040A25IDBZT
Brand: Texas Instruments
SKU: LM4040A25IDBZT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040A25IDBZT

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4040A25IDBZT.pdf

Description:: IC VREF SHUNT 0.1% SOT23-3

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Product details

Overview

LM4040A25IDBZT from Texas Instruments is a precision micropower shunt voltage reference with 2.5V nominal output, ±0.1% initial accuracy (A-grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a low-drift, low-noise voltage reference in high-resolution ADCs and sensor signal chains for industrial process control systems.

For engineers reviewing the LM4040A25IDBZT datasheet, LM4040A25IDBZT pinout, LM4040A25IDBZT application, or LM4040A25IDBZT equivalent, key selection criteria include initial tolerance at 25°C, thermal drift over –40°C to 85°C, dynamic impedance under varying load current, noise performance in 10Hz–10kHz bandwidth, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040A25IDBZT operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 2.5V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon junction delivers tight initial tolerance and low temperature coefficient via wafer-level trimming, enabling stable reference performance without external components.

It exhibits low dynamic impedance (≤0.8Ω at 1mA), minimal voltage variation with cathode current (≤6mV over 1mA–15mA), and thermal hysteresis of only 0.08% - critical for repeatable measurements in field transmitters and portable instrumentation where ambient temperature swings occur.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5V nominal at I_Z = 100μA, 25°C - sets absolute scaling for 12-bit+ data acquisition systems
Initial Accuracy	±0.1% max at 25°C - enables <1 LSB error in 10-bit systems without calibration
Temp Coefficient	100ppm/°C max - contributes ≤±0.075% drift over –40°C to 85°C operating range
Operating Current	45μA min to 15mA max - supports ultra-low-power sensor nodes and high-current DAC buffers
Output Noise	35μV_RMS (10Hz–10kHz) - limits effective resolution to ~18.5 bits in precision ADC front-ends
Dynamic Impedance	0.3–0.8Ω at 1mA - ensures <0.8mV output shift under 1mA load transients
Thermal Hysteresis	0.08% - guarantees repeatable voltage after thermal cycling in automotive and industrial environments

Pinout & Package

LM4040A25IDBZT uses the SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, 3-pin surface-mount, JEDEC MO-178 compatible. Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is NC (No Internal Connection) - must float or connect to Anode per TI EMI guidance.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current input / voltage sense node	Sinks all reference current; connects to regulated supply rail or op-amp inverting input in feedback configurations
Anode (Pin 2)	Common return / ground reference	Typically tied to system ground; defines 0V reference point for output voltage measurement
NC (Pin 3)	No internal connection	Must remain unconnected or tied to Anode to reduce EMI susceptibility near switching noise sources

Key Features

Feature	Design Value
Stable with all capacitive loads	No output capacitor required - eliminates BOM cost and layout sensitivity in space-constrained modules
Wide operating current range	45μA to 15mA - supports both battery-powered sensors and high-drive analog outputs
Low temperature coefficient	100ppm/°C max - maintains <±0.1% output deviation across full industrial temperature range
Low wideband noise	35μV_RMS - preserves SNR in 24-bit delta-sigma ADCs without additional filtering
Extended temperature grade	–40°C to 85°C (I-grade) - qualified for deployment in factory automation and outdoor energy infrastructure

Applications

Industrial Process Transmitter	Precision Data Acquisition
Use Scenario: 4–20mA loop-powered field transmitter measuring pressure or temperature in oil & gas facilities. IC Role / Device Role / Timing Role: Shunt voltage reference for excitation of RTD/bridge sensors and scaling of ADC input range. Use Value: ±0.1% initial accuracy and 100ppm/°C drift ensure <0.2% total error over –40°C to 85°C without calibration.	Use Scenario: 24-bit delta-sigma ADC module in portable power quality analyzer. IC Role / Device Role / Timing Role: Primary reference for analog front-end, directly connected to ADC REF+ pin. Use Value: 35μV_RMS noise enables >110dB SNR; stability with capacitive loads avoids instability when ADC input capacitance varies.
Automotive Battery Monitor	Energy Infrastructure Metering
Use Scenario: High-side cell voltage monitoring in 12S Li-ion battery packs for EVs. IC Role / Device Role / Timing Role: Precision reference for isolated sigma-delta modulator driving digital isolator. Use Value: Low 45μA minimum current allows operation during deep sleep modes; thermal hysteresis <0.08% prevents offset drift after thermal cycling.	Use Scenario: Revenue-grade electricity meter requiring ANSI C12.20 Class 0.2 accuracy. IC Role / Device Role / Timing Role: Reference source for metrology ADC and anti-aliasing filter gain-setting resistors. Use Value: Long-term stability of 120ppm over 1000 hours ensures calibration retention between utility maintenance cycles.

Industrial Process Transmitter

Precision Data Acquisition

Use Scenario: 4–20mA loop-powered field transmitter measuring pressure or temperature in oil & gas facilities.

IC Role / Device Role / Timing Role: Shunt voltage reference for excitation of RTD/bridge sensors and scaling of ADC input range.

Use Value: ±0.1% initial accuracy and 100ppm/°C drift ensure <0.2% total error over –40°C to 85°C without calibration.

Use Scenario: 24-bit delta-sigma ADC module in portable power quality analyzer.

IC Role / Device Role / Timing Role: Primary reference for analog front-end, directly connected to ADC REF+ pin.

Use Value: 35μV_RMS noise enables >110dB SNR; stability with capacitive loads avoids instability when ADC input capacitance varies.

Automotive Battery Monitor

Energy Infrastructure Metering

Use Scenario: High-side cell voltage monitoring in 12S Li-ion battery packs for EVs.

IC Role / Device Role / Timing Role: Precision reference for isolated sigma-delta modulator driving digital isolator.

Use Value: Low 45μA minimum current allows operation during deep sleep modes; thermal hysteresis <0.08% prevents offset drift after thermal cycling.

Use Scenario: Revenue-grade electricity meter requiring ANSI C12.20 Class 0.2 accuracy.

IC Role / Device Role / Timing Role: Reference source for metrology ADC and anti-aliasing filter gain-setting resistors.

Use Value: Long-term stability of 120ppm over 1000 hours ensures calibration retention between utility maintenance cycles.

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	2.5V, ±0.2% initial accuracy, 50ppm/°C, 25μV_RMS noise, 50μA min current	Lower noise and tempco but higher min current; requires PCB layout attention for noise coupling	Select for ultra-low-noise metrology where 10μV improvement justifies tighter layout controls
ADR3425ARJZ-R7	2.5V, ±0.1% initial accuracy, 75ppm/°C, 50μV_RMS noise, 100μA min current	Higher noise and min current; SC70-5 package with dedicated V_OUT and GND pins	Choose when board space permits larger package and system can support ≥100μA quiescent current

Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4040A25IDBZT offers the lowest minimum operating current (45μA) and highest tolerance grade (A) in SOT-23, making it optimal for battery-critical and cost-sensitive industrial designs where moderate noise is acceptable.

Availability

LM4040A25IDBZT is available at Aetrix Electronics and suitable for industrial process transmitters, precision data acquisition modules, and automotive battery monitors requiring stable component supply with guaranteed long-term availability.

Supply support for LM4040A25IDBZT 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 50 years of innovation in precision analog ICs and industrial-grade components.

The LM4040 series belongs to TI's precision voltage reference product line, designed specifically for applications demanding high initial accuracy, low temperature drift, and robust operation in harsh industrial and automotive environments.

FAQ

What is the maximum cathode current rating for LM4040A25IDBZT?

The absolute maximum cathode current for LM4040A25IDBZT is 25mA, but the recommended operating range is 45μA to 15mA. Operating above 15mA increases self-heating and may degrade long-term stability; sustained currents beyond 25mA risk permanent damage per TI's Absolute Maximum Ratings table.

Does LM4040A25IDBZT require an output capacitor for stability?

No, LM4040A25IDBZT is inherently stable with all capacitive loads and does not require an external output capacitor. This is confirmed in TI's datasheet Section 1 (Features) and Section 3 (Description), which explicitly state "stable with all capacitive loads; no output capacitor required" - simplifying design and reducing BOM count.

What is the thermal hysteresis specification for LM4040A25IDBZT?

The thermal hysteresis of LM4040A25IDBZT is 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This value is consistent across all LM4040 grades and packages, and is specified in Tables 6.5–6.10 of the TI datasheet under the VHYST parameter.

Can LM4040A25IDBZT be used in automotive applications?

LM4040A25IDBZT is rated for –40°C to 85°C (industrial grade), making it suitable for under-hood automotive applications with controlled thermal environments, such as battery management subsystems or body control modules. For extended temperature requirements (–40°C to 125°C), TI offers the Q-grade variant LM4040A25QDBZT.

How does the 100ppm/°C temperature coefficient impact LM4040A25IDBZT performance over temperature?

With a 100ppm/°C coefficient, LM4040A25IDBZT contributes ±0.075% output deviation over –40°C to 85°C (ΔT = 125°C), equating to ±1.875mV at 2.5V. This is verified in TI's overtemperature tolerance calculation: ±0.1% + (100ppm/°C × 125°C × 2.5V) = ±0.1% ±0.03125V = ±0.075% total.

LM4040A25IDBZT 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:: ±0.1%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 35µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 80 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4040A25IDBZT FAQ

1.How can I place an order for LM4040A25IDBZT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040A25IDBZT 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 LM4040A25IDBZT reliable?

The price and inventory of LM4040A25IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A25IDBZT is usually 5 days.

3.What payment methods are accepted for LM4040A25IDBZT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040A25IDBZT transactions.

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4.How is shipping managed for LM4040A25IDBZT?

LM4040A25IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040A25IDBZT 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 LM4040A25IDBZT?

For technical support, including LM4040A25IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A25IDBZT requirements.

6.How does Aetrix verify that LM4040A25IDBZT is sourced from the original manufacturer or authorized distributors?

All LM4040A25IDBZT 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 LM4040A25IDBZT meets industry standards.

7.What is the process for return or replacement of LM4040A25IDBZT?

All LM4040A25IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A25IDBZT, 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 LM4040A25IDBZT part is unused and in its original packaging.

Return procedure for LM4040A25IDBZT:

1.Submit a request within 90 days.

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

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