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

Texas Instruments LM4040C25IDBZT

Name: LM4040C25IDBZT
Brand: Texas Instruments
SKU: LM4040C25IDBZT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040C25IDBZT

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4040C25IDBZT.pdf

Description:: IC VREF SHUNT 0.5% SOT23-3

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Product details

Overview

LM4040C25IDBZT from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation, with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a compact, low-power reference in analog-to-digital converters and sensor signal conditioning circuits.

For engineers reviewing the LM4040C25IDBZT datasheet, LM4040C25IDBZT pinout, LM4040C25IDBZT application, or LM4040C25IDBZT equivalent, key selection criteria include output tolerance over temperature, minimum operating current, dynamic impedance, noise performance, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040C25IDBZT uses Zener-zap trimming during wafer sort to achieve its C-grade (±0.5%) initial accuracy at 25°C and maintains tight thermal stability via low-TC design. Its two-terminal shunt architecture requires only an external series resistor and operates across 45μA–15mA cathode current, enabling use in both micropower and moderate-current applications.

It delivers stable 2.5V reference voltage independent of load capacitance-no output capacitor needed-and features low 0.9Ω typical dynamic impedance at 1mA, ensuring minimal voltage shift under varying load conditions. Thermal hysteresis is specified at 0.08%, supporting repeatable precision in cycling environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5V nominal at I_Z = 100μA; fixed value, no adjustment required
Initial Accuracy	±0.5% max at 25°C; defines worst-case DC offset in calibration-sensitive systems
Temp Coefficient	100ppm/°C max over –40°C to 85°C; contributes ≤±0.25% error across full range
Min Cathode Current	45μA typical; enables operation in ultra-low-power sensor front-ends and battery monitors
Wideband Noise	35μV_RMS (10Hz–10kHz); supports high-resolution ADCs (≥16-bit) without added filtering
Dynamic Impedance	0.9Ω typical at 1mA; limits voltage variation to <1mV per 1mA load transients
Thermal Hysteresis	0.08% max; ensures <2μV repeatability after thermal cycling between –40°C and 125°C

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, tape-and-reel compatible.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current input / voltage reference node	Connected to regulated supply rail; sinks all cathode current; sets reference potential
Anode (Pin 2)	Common return / ground reference	Typically tied to system ground; forms current path with cathode for regulation
NC (Pin 3)	No internal connection	Must be left floating or connected to anode per EMI mitigation guidance in noisy environments

Key Features

Feature	Design Value
Zero-output-capacitor operation	Stable with any capacitive load; eliminates BOM cost and layout area for stabilization caps
Micropower start-up	45μA typical minimum cathode current enables use in energy-harvesting and coin-cell systems
Low-noise reference	35μV_RMS noise supports 16-bit+ SAR and delta-sigma ADCs without post-filtering
Extended temp grade	Specified over –40°C to 85°C; suitable for industrial and automotive under-hood modules
Low dynamic impedance	0.9Ω typical ensures <1mV regulation error during 1mA load steps in precision DAC buffers

Applications

Industrial Data Acquisition	Automotive Sensor Conditioning
Use Scenario: High-accuracy 16-bit ADC front-end in programmable logic controllers (PLCs) with isolated analog inputs. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for ADC full-scale calibration and ratiometric sensor measurements. Use Value: ±0.5% initial accuracy and 100ppm/°C TC ensure <0.1% total unadjusted error over temperature, meeting IEC 61000-6-2 immunity requirements.	Use Scenario: Reference for pressure and temperature sensors in engine control units (ECUs) exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Supplies excitation and reference voltage for bridge-based sensors in closed-loop feedback paths. Use Value: 0.08% thermal hysteresis and stable operation to 85°C enable repeatable sensor output after repeated hot/cold cycles.
Portable Medical Instrumentation	Smart Energy Metering
Use Scenario: Battery-powered handheld ECG monitor requiring low-power, high-precision analog front-end. IC Role / Device Role / Timing Role: Reference for low-noise instrumentation amplifier and successive-approximation ADC. Use Value: 35μV_RMS noise and 45μA min current allow >100k-hour operation on a single CR2032 cell while maintaining diagnostic-grade SNR.	Use Scenario: Revenue-grade electricity meter using metrology-grade ADCs for kWh measurement compliance (IEC 62053-21). IC Role / Device Role / Timing Role: Primary voltage reference for polyphase energy measurement ASICs with anti-tampering detection. Use Value: Long-term stability of 120ppm over 1000 hours ensures meter calibration drift remains within Class 0.2 accuracy limits over 10-year field life.

Industrial Data Acquisition

Automotive Sensor Conditioning

Use Scenario: High-accuracy 16-bit ADC front-end in programmable logic controllers (PLCs) with isolated analog inputs.

IC Role / Device Role / Timing Role: Provides stable 2.5V reference for ADC full-scale calibration and ratiometric sensor measurements.

Use Value: ±0.5% initial accuracy and 100ppm/°C TC ensure <0.1% total unadjusted error over temperature, meeting IEC 61000-6-2 immunity requirements.

Use Scenario: Reference for pressure and temperature sensors in engine control units (ECUs) exposed to under-hood thermal cycling.

IC Role / Device Role / Timing Role: Supplies excitation and reference voltage for bridge-based sensors in closed-loop feedback paths.

Use Value: 0.08% thermal hysteresis and stable operation to 85°C enable repeatable sensor output after repeated hot/cold cycles.

Portable Medical Instrumentation

Smart Energy Metering

Use Scenario: Battery-powered handheld ECG monitor requiring low-power, high-precision analog front-end.

IC Role / Device Role / Timing Role: Reference for low-noise instrumentation amplifier and successive-approximation ADC.

Use Value: 35μV_RMS noise and 45μA min current allow >100k-hour operation on a single CR2032 cell while maintaining diagnostic-grade SNR.

Use Scenario: Revenue-grade electricity meter using metrology-grade ADCs for kWh measurement compliance (IEC 62053-21).

IC Role / Device Role / Timing Role: Primary voltage reference for polyphase energy measurement ASICs with anti-tampering detection.

Use Value: Long-term stability of 120ppm over 1000 hours ensures meter calibration drift remains within Class 0.2 accuracy limits over 10-year field life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL4050C25IDBZR	Same 2.5V output, ±0.5% accuracy, but higher 75μA min cathode current; 50μV_RMS noise	Limited suitability in sub-50μA micropower designs; less optimal for ultra-low-noise 18-bit ADCs	Prefer LM4040C25IDBZT where <50μA start-up or <40μV noise is required
REF3025AIDBZR	Series reference (not shunt); requires 50μA quiescent + load current; 25μV_RMS noise; 50ppm/°C TC	Needs external bypass cap; incompatible with shunt topology; better for low-TC, low-noise, non-capacitive-load apps	Choose REF3025AIDBZR only when series topology is acceptable and tighter TC/noise outweighs shunt simplicity

Compared with TL4050C25IDBZR and REF3025AIDBZR, the LM4040C25IDBZT uniquely combines shunt simplicity, 45μA start-up, and 35μV_RMS noise-making it optimal for space-constrained, micropower, capacitive-load-tolerant designs where topology flexibility is limited.

Availability

LM4040C25IDBZT is available at Aetrix Electronics and suitable for industrial data acquisition, automotive sensor conditioning, portable medical instrumentation, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040C25IDBZT 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 for cost-sensitive, space-constrained applications demanding high accuracy without external components-targeting industrial automation, automotive sensing, and portable instrumentation markets.

FAQ

What is the operating temperature range for the LM4040C25IDBZT?

The LM4040C25IDBZT is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade rating makes it suitable for deployment in factory automation equipment, automotive cabin modules, and outdoor metering devices where environmental extremes are expected. The device maintains its ±0.5% initial accuracy and 100ppm/°C temperature coefficient across this full range.

Does the LM4040C25IDBZT require an output capacitor?

No, the LM4040C25IDBZT is stable with all capacitive loads and does not require an output capacitor for regulation. Its internal design eliminates the need for external compensation, simplifying PCB layout and reducing BOM count-especially valuable in space-constrained applications like wearable medical sensors and smart meter modules.

What is the minimum cathode current needed for regulation in the LM4040C25IDBZT?

The LM4040C25IDBZT has a typical minimum cathode current of 45μA at 25°C, with a maximum of 80μA across –40°C to 85°C. This ultra-low start-up current enables reliable operation in energy-harvesting systems, battery-backed real-time clocks, and always-on sensor nodes where power budgets are measured in microamps.

How does the LM4040C25IDBZT compare to A-grade or B-grade variants of the same family?

The LM4040C25IDBZT offers ±0.5% initial accuracy and 100ppm/°C temperature coefficient-tighter than D-grade (±1.0%, 150ppm/°C) but less precise than A-grade (±0.1%, 100ppm/°C) or B-grade (±0.2%, 100ppm/°C). It balances cost and performance for applications where 0.5% tolerance meets system-level accuracy targets without premium pricing.

Can the LM4040C25IDBZT be used in place of the LM4040A25IDBZT or LM4040B25IDBZT?

The LM4040C25IDBZT shares identical pinout, package, and basic electrical behavior with LM4040A25IDBZT and LM4040B25IDBZT, but differs in accuracy grade. Substitution is electrically possible if system-level tolerance budgets accommodate ±0.5% instead of ±0.1% or ±0.2%. No PCB changes are needed, but calibration validation is recommended after replacement.

LM4040C25IDBZT 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:: ±0.5%

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

LM4040C25IDBZT FAQ

1.How can I place an order for LM4040C25IDBZT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040C25IDBZT 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 LM4040C25IDBZT reliable?

The price and inventory of LM4040C25IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25IDBZT is usually 5 days.

3.What payment methods are accepted for LM4040C25IDBZT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C25IDBZT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040C25IDBZT?

LM4040C25IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040C25IDBZT 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 LM4040C25IDBZT?

For technical support, including LM4040C25IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25IDBZT requirements.

6.How does Aetrix verify that LM4040C25IDBZT is sourced from the original manufacturer or authorized distributors?

All LM4040C25IDBZT 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 LM4040C25IDBZT meets industry standards.

7.What is the process for return or replacement of LM4040C25IDBZT?

All LM4040C25IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25IDBZT, 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 LM4040C25IDBZT part is unused and in its original packaging.

Return procedure for LM4040C25IDBZT:

1.Submit a request within 90 days.

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

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