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

Texas Instruments LM4040A20IDBZT

Name: LM4040A20IDBZT
Brand: Texas Instruments
SKU: LM4040A20IDBZT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040A20IDBZT

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4040A20IDBZT.pdf

Description:: IC VREF SHUNT 0.1% SOT23-3

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Product details

Overview

LM4040A20IDBZT from Texas Instruments is a precision 2.048V shunt voltage reference in SOT-23-3 (DBZ) package, rated A-grade with ±0.1% initial accuracy and 100ppm/°C temperature coefficient over –40°C to 85°C. It delivers low 35μVRMS noise, operates from 45μA to 15mA cathode current, and stabilizes without output capacitance-ideal for high-resolution ADC biasing in portable data-acquisition systems.

For engineers reviewing the LM4040A20IDBZT datasheet, LM4040A20IDBZT pinout, LM4040A20IDBZT application, or LM4040A20IDBZT equivalent, key selection criteria include guaranteed 2.048V output tolerance at 100μA test current, thermal hysteresis ≤0.08%, dynamic impedance ≤0.8Ω at 1mA, long-term stability of 120ppm over 1000 hours, and compatibility with all capacitive loads.

Technical Context

The LM4040A20IDBZT uses Zener-zap trimming during wafer sort to achieve its 0.1% initial accuracy, enabling precise voltage setting in feedback loops and sensor excitation circuits. Its two-terminal shunt architecture requires only an external current-limiting resistor and functions as a stable voltage sink across wide operating currents.

Designed for industrial ambient temperatures (–40°C to 85°C), it maintains tight regulation via low dynamic impedance (≤0.8Ω) and low temperature coefficient (100ppm/°C), ensuring minimal drift in analog signal chains where reference stability directly impacts measurement fidelity.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.048V nominal at I_Z = 100μA - matches standard 12-bit DAC/ADC full-scale scaling.
Initial Accuracy	±0.1% max at 25°C - enables <1 LSB error in 10-bit systems without calibration.
Temp Coefficient	100ppm/°C max - contributes ≤±6.5mV drift over –40°C to 85°C operating range.
Min Cathode Current	45μA typical - supports ultra-low-power sensor nodes and battery-backed monitoring.
Dynamic Impedance	0.3–0.8Ω at 1mA - ensures stable regulation under fast load transients in precision amplifiers.
Wideband Noise	35μVRMS (10Hz–10kHz) - avoids noise-induced errors in 16-bit+ SAR ADC references.
Thermal Hysteresis	0.08% max - guarantees repeatable voltage after thermal cycling in field-deployed equipment.

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, JEDEC-compliant, thermally enhanced for industrial environments.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current input / voltage reference node	Connects to regulated voltage rail; sinks all cathode current; defines V_Z at this node.
Anode (Pin 2)	Common return / ground reference	Must be connected to system ground or lowest potential point; establishes reference baseline.
NC (Pin 3)	No internal connection	Float or tie to anode per TI EMI guidance; no electrical function but affects layout symmetry.

Key Features

Feature	Design Value
Zero-output-capacitor operation	Stable with any capacitive load - eliminates BOM cost and board space for external C_OUT.
Ultra-low quiescent current	45μA minimum cathode current - extends battery life in portable instrumentation.
Low-noise voltage source	35μVRMS noise floor - preserves SNR in high-gain front-end stages and precision ADC drivers.
High-grade accuracy binning	A-grade (0.1%) trim - reduces system-level calibration burden in metrology and test equipment.
Extended temperature support	Rated –40°C to 85°C - qualified for industrial control cabinets and outdoor energy infrastructure.

Applications

Data-Acquisition Systems	Analog Input Module
Use Scenario: High-resolution 16-bit SAR ADC reference in portable environmental sensor loggers. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.048V reference for ADC VREF input. Use Value: Enables full-scale utilization of 12-bit DAC codes (2.048V = 2¹¹ × 1mV) with <0.5 LSB total error over temperature.	Use Scenario: Modular PLC analog input card with isolated 4–20mA loop receivers. IC Role / Device Role / Timing Role: Precision bias source for op-amp-based current-to-voltage conversion. Use Value: Maintains <±0.02% gain stability across –25°C to 70°C cabinet temperatures due to 100ppm/°C TC.
Energy Infrastructure	Field Transmitters
Use Scenario: Smart meter voltage sensing channel with anti-tampering diagnostics. IC Role / Device Role / Timing Role: Reference for differential voltage measurement of grid phase voltages. Use Value: Delivers 120ppm long-term stability over 1000h, meeting IEC 62053-21 Class 0.2 accuracy requirements.	Use Scenario: Two-wire 4–20mA pressure transmitter with HART modulation. IC Role / Device Role / Timing Role: Stable excitation source for bridge-type pressure sensors. Use Value: Low 35μVRMS noise prevents HART signal corruption; 45μA min current allows operation down to 3.3V supply.

Data-Acquisition Systems

Analog Input Module

Use Scenario: High-resolution 16-bit SAR ADC reference in portable environmental sensor loggers.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.048V reference for ADC VREF input.

Use Value: Enables full-scale utilization of 12-bit DAC codes (2.048V = 2¹¹ × 1mV) with <0.5 LSB total error over temperature.

Use Scenario: Modular PLC analog input card with isolated 4–20mA loop receivers.

IC Role / Device Role / Timing Role: Precision bias source for op-amp-based current-to-voltage conversion.

Use Value: Maintains <±0.02% gain stability across –25°C to 70°C cabinet temperatures due to 100ppm/°C TC.

Energy Infrastructure

Field Transmitters

Use Scenario: Smart meter voltage sensing channel with anti-tampering diagnostics.

IC Role / Device Role / Timing Role: Reference for differential voltage measurement of grid phase voltages.

Use Value: Delivers 120ppm long-term stability over 1000h, meeting IEC 62053-21 Class 0.2 accuracy requirements.

Use Scenario: Two-wire 4–20mA pressure transmitter with HART modulation.

IC Role / Device Role / Timing Role: Stable excitation source for bridge-type pressure sensors.

Use Value: Low 35μVRMS noise prevents HART signal corruption; 45μA min current allows operation down to 3.3V supply.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AIDBZR	Adjustable (2.5V setpoint), 0.5% initial accuracy, 100ppm/°C TC, 80μA min cathode current	Requires external resistor divider; less accurate; higher quiescent current	Select when adjustable output or higher voltage (≥2.5V) is needed; not drop-in for fixed 2.048V use.
MAX6002AEUR+T	Fixed 2.048V, 0.1% accuracy, 75ppm/°C TC, 30μA min current, SC70-3 package	Lower TC and lower min current; different package (SC70 vs SOT-23); not automotive-qualified	Prefer for ultra-low-power designs where 15μA lower min current matters; verify PCB land pattern compatibility.

Compared with TLVH431AIDBZR and MAX6002AEUR+T, the LM4040A20IDBZT offers the only A-grade 2.048V shunt reference in standard SOT-23-3 with guaranteed 45μA start-up and 0.08% thermal hysteresis-making it optimal for calibrated industrial data loggers where fixed voltage, low noise, and repeatability are mandatory.

Availability

LM4040A20IDBZT is available at Aetrix Electronics and suitable for data-acquisition systems, analog input modules, and energy infrastructure applications requiring stable component supply, long-lifecycle assurance, and traceable industrial-grade sourcing.

Supply support for LM4040A20IDBZT 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 leadership in precision reference design.

The LM4040 series was developed to deliver micropower, high-accuracy shunt references for portable and industrial instrumentation-emphasizing zero-capacitor stability, low noise, and robust temperature performance.

FAQ

What is the maximum cathode current rating for LM4040A20IDBZT?

The absolute maximum cathode current for LM4040A20IDBZT is 25mA per the Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability; sustained operation above 25mA risks permanent damage to the device's Zener junction.

Does LM4040A20IDBZT require an external output capacitor?

No, LM4040A20IDBZT is stable with all capacitive loads and does not require an external output capacitor. This is confirmed in the datasheet Features section and validated across all package variants. Adding capacitance does not harm performance but provides no regulation benefit-reducing BOM count and PCB area in space-constrained designs.

What is the thermal hysteresis specification for LM4040A20IDBZT?

The thermal hysteresis for LM4040A20IDBZT is specified as ≤0.08% over a –40°C to 125°C cycle. This value represents the maximum deviation in output voltage measured at 25°C before and after extreme temperature cycling, ensuring repeatable reference behavior in field-redeployed equipment subject to ambient thermal swings.

Can LM4040A20IDBZT operate from a 3.3V supply?

Yes, LM4040A20IDBZT can operate from a 3.3V supply when used with an appropriate current-limiting resistor. With a 2.048V output, the headroom is 1.252V; using a 10kΩ resistor yields ~125μA cathode current-well within the 45μA–15mA operating range and sufficient for low-noise performance in battery-powered sensors.

Is LM4040A20IDBZT qualified for automotive applications?

No, LM4040A20IDBZT is rated for the industrial temperature range (–40°C to 85°C) and is not AEC-Q200 qualified. For automotive applications, TI offers the LM4040Q series (e.g., LM4040C20Q), which is qualified to –40°C to 125°C and meets automotive reliability standards-LM4040A20IDBZT itself is not intended for under-hood or safety-critical vehicle systems.

LM4040A20IDBZT 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):: 2.048V

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

LM4040A20IDBZT FAQ

1.How can I place an order for LM4040A20IDBZT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040A20IDBZT 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 LM4040A20IDBZT reliable?

The price and inventory of LM4040A20IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A20IDBZT is usually 5 days.

3.What payment methods are accepted for LM4040A20IDBZT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040A20IDBZT transactions.

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4.How is shipping managed for LM4040A20IDBZT?

LM4040A20IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040A20IDBZT 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 LM4040A20IDBZT?

For technical support, including LM4040A20IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A20IDBZT requirements.

6.How does Aetrix verify that LM4040A20IDBZT is sourced from the original manufacturer or authorized distributors?

All LM4040A20IDBZT 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 LM4040A20IDBZT meets industry standards.

7.What is the process for return or replacement of LM4040A20IDBZT?

All LM4040A20IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A20IDBZT, 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 LM4040A20IDBZT part is unused and in its original packaging.

Return procedure for LM4040A20IDBZT:

1.Submit a request within 90 days.

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

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