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

Texas Instruments LM4040B82IDBZT

Name: LM4040B82IDBZT
Brand: Texas Instruments
SKU: LM4040B82IDBZT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040B82IDBZT

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4040B82IDBZT.pdf

Description:: IC VREF SHUNT 0.2% SOT23-3

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Product details

Overview

LM4040B82IDBZT from Texas Instruments is a precision 8.192 V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation, with ±0.2% initial accuracy, 100 ppm/°C temperature coefficient, 35 μV_RMS wideband noise, and stable operation down to 45 μA cathode current. It serves as a compact, capacitor-free reference in high-resolution ADC biasing and industrial sensor signal conditioning circuits.

For engineers reviewing the LM4040B82IDBZT datasheet, LM4040B82IDBZT pinout, LM4040B82IDBZT application, or LM4040B82IDBZT equivalent, key selection criteria include its guaranteed 8.192 V output at 100 μA, low dynamic impedance (<0.9 Ω), thermal hysteresis of 0.08%, long-term stability (120 ppm over 1000 h), and compatibility with all capacitive loads without external compensation.

Technical Context

The LM4040B82IDBZT operates as a two-terminal shunt reference, sinking cathode current (I_Z) to maintain a precise 8.192 V reverse breakdown voltage across its terminals. Its Zener-zap trimmed bandgap core delivers grade-B accuracy and low drift over temperature via internal curvature compensation.

It requires no output capacitor and remains stable under full capacitive loading due to inherently low dynamic impedance (0.3–0.9 Ω) and minimal phase shift. The device draws only 45 μA minimum cathode current, enabling use in micropower systems where supply headroom is constrained.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	8.192 V nominal at I_Z = 100 μA - matches standard 13-bit DAC/ADC full-scale scaling and binary-weighted reference chains.
Initial Accuracy	±0.2% max at 25°C - enables <1 LSB error in 12-bit systems without calibration.
Tempco	100 ppm/°C max - contributes ≤±0.82 mV drift over –40°C to 85°C ambient range.
Noise (10 Hz–10 kHz)	35 μV_RMS typical - supports high-SNR measurements in precision data acquisition front ends.
Min Cathode Current	45 μA typical - allows operation from ultra-low-current sources such as high-impedance dividers or leakage-limited supplies.
Dynamic Impedance	0.3–0.9 Ω at I_Z = 1 mA - ensures minimal load regulation error (<1 mV) under varying sink current.
Thermal Hysteresis	0.08% - limits repeatability error after thermal cycling, critical for field-deployed instrumentation.

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm footprint, 1.1 mm height, surface-mount, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current input / voltage sense node	Connected to regulated rail; sinks current to maintain 8.192 V between Cathode and Anode.
Anode (Pin 2)	Reference ground / common return	Typically tied to system ground; forms the 0 V reference point for output voltage measurement.
NC (Pin 3)	No internal connection	Must be left floating or connected to Anode per EMI mitigation guidance in TI datasheet Section 5.

Key Features

Feature	Design Value
Capacitor-free stability	Operates reliably with any capacitive load (0–∞), eliminating need for output bypass and simplifying layout in space-constrained modules.
Micropower operation	45 μA typical minimum cathode current enables direct biasing from high-value resistive dividers or low-quiescent LDOs.
Low-noise performance	35 μV_RMS broadband noise supports sub-16-bit ENOB in precision SAR ADC references without filtering overhead.
Extended temp range	Specified from –40°C to +85°C (I-grade), ensuring consistent 8.192 V output in industrial control cabinets and outdoor transmitters.
Low thermal hysteresis	0.08% hysteresis minimizes calibration drift after thermal cycling-critical for field-replaceable sensor modules.

Applications

Industrial Analog Input Module	High-Resolution Data Acquisition
Use Scenario: 16-bit isolated analog input channel measuring 4–20 mA loop signals in PLC backplanes. IC Role / Device Role / Timing Role: Provides stable 8.192 V reference for ADC driver stage and programmable gain amplifier offset trimming. Use Value: Enables ±0.5 LSB total unadjusted error across temperature without recalibration, leveraging grade-B accuracy and 100 ppm/°C tempco.	Use Scenario: Portable battery-powered oscilloscope front end digitizing ±10 V signals at 1 MS/s. IC Role / Device Role / Timing Role: Supplies low-noise, low-drift reference to dual-slope integrator and SAR ADC reference buffer. Use Value: 35 μV_RMS noise and 0.08% thermal hysteresis preserve effective resolution >15.5 bits over operating life.
Field Transmitter Calibration	Energy Infrastructure Monitoring
Use Scenario: Loop-powered 4–20 mA pressure transmitter with onboard microcontroller and HART modem. IC Role / Device Role / Timing Role: References ADC measuring bridge sensor output and DAC generating loop current setpoint. Use Value: 45 μA min cathode current allows direct derivation from loop power, eliminating auxiliary supply and reducing BOM count.	Use Scenario: Smart electricity meter measuring voltage and current waveforms with metrology-grade accuracy. IC Role / Device Role / Timing Role: Supplies precision reference to polyphase energy measurement IC's internal ADCs and anti-alias filters. Use Value: Guaranteed ±0.2% initial tolerance and 120 ppm long-term stability meet IEC 62053-21 Class 0.2 requirements for revenue-grade metering.

Industrial Analog Input Module

High-Resolution Data Acquisition

Use Scenario: 16-bit isolated analog input channel measuring 4–20 mA loop signals in PLC backplanes.

IC Role / Device Role / Timing Role: Provides stable 8.192 V reference for ADC driver stage and programmable gain amplifier offset trimming.

Use Value: Enables ±0.5 LSB total unadjusted error across temperature without recalibration, leveraging grade-B accuracy and 100 ppm/°C tempco.

Use Scenario: Portable battery-powered oscilloscope front end digitizing ±10 V signals at 1 MS/s.

IC Role / Device Role / Timing Role: Supplies low-noise, low-drift reference to dual-slope integrator and SAR ADC reference buffer.

Use Value: 35 μV_RMS noise and 0.08% thermal hysteresis preserve effective resolution >15.5 bits over operating life.

Field Transmitter Calibration

Energy Infrastructure Monitoring

Use Scenario: Loop-powered 4–20 mA pressure transmitter with onboard microcontroller and HART modem.

IC Role / Device Role / Timing Role: References ADC measuring bridge sensor output and DAC generating loop current setpoint.

Use Value: 45 μA min cathode current allows direct derivation from loop power, eliminating auxiliary supply and reducing BOM count.

Use Scenario: Smart electricity meter measuring voltage and current waveforms with metrology-grade accuracy.

IC Role / Device Role / Timing Role: Supplies precision reference to polyphase energy measurement IC's internal ADCs and anti-alias filters.

Use Value: Guaranteed ±0.2% initial tolerance and 120 ppm long-term stability meet IEC 62053-21 Class 0.2 requirements for revenue-grade metering.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM4040C82IDBZT	±0.5% initial accuracy, same 8.192 V output and SOT-23-3 package	Acceptable where 12-bit system accuracy suffices and cost reduction is prioritized	Select when design margin allows higher initial error and long-term stability requirements are unchanged.
REF43GM	8.192 V, ±0.05% initial accuracy, 3 ppm/°C tempco, SOIC-8 package, 1.2 mA quiescent	Higher precision and lower drift, but larger footprint and 27× higher supply current	Choose for metrology-grade applications requiring <0.1 LSB error in 16-bit+ systems, accepting size and power trade-offs.

Compared with LM4040C82IDBZT, the LM4040B82IDBZT offers tighter initial tolerance at identical package and micropower operation; compared with REF43GM, it trades absolute precision and ultra-low drift for 27× lower current draw and 60% smaller footprint-making it optimal for portable, battery-critical, or space-constrained industrial nodes.

Availability

LM4040B82IDBZT is available at Aetrix Electronics and suitable for industrial analog input modules, high-resolution data acquisition systems, field transmitter calibration circuits, and energy infrastructure monitoring equipment requiring stable component supply and guaranteed long-term parametric consistency.

Supply support for LM4040B82IDBZT 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 and high-volume manufacturing reliability.

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

FAQ

What is the exact output voltage tolerance of LM4040B82IDBZT at 25°C?

The LM4040B82IDBZT has a maximum initial output voltage tolerance of ±0.2% at 25°C, corresponding to ±16.4 mV around the nominal 8.192 V output. This is verified per TI's LM4040B82I Electrical Characteristics table (Section 6.19), tested at I_Z = 100 μA.

Does LM4040B82IDBZT require an output capacitor for stability?

No, the LM4040B82IDBZT is explicitly designed to be stable with all capacitive loads-including zero capacitance-and does not require an external output capacitor. This is confirmed in the "Features" section and "Stable with all capacitive loads; no output capacitor required" statement in the TI datasheet.

What is the minimum cathode current needed for LM4040B82IDBZT to regulate properly?

The LM4040B82IDBZT requires a minimum cathode current of 45 μA (typical) to maintain regulation within specification. At temperatures up to 85°C, the guaranteed minimum is 80 μA, as specified in the "Electrical Characteristics" table for LM4040B82I (Section 6.19).

Can LM4040B82IDBZT operate across the full industrial temperature range?

Yes, the LM4040B82IDBZT is characterized for operation from –40°C to +85°C (industrial grade, denoted by the "I" suffix in the part number). Its parameters-including accuracy, tempco, and noise-are fully specified across this range per TI's LM4040B82I datasheet tables.

What package type is used for LM4040B82IDBZT?

The LM4040B82IDBZT uses the SOT-23-3 (DBZ) package: a 3-pin, surface-mount plastic package measuring 2.92 mm × 1.30 mm with 1.1 mm maximum height. 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.

LM4040B82IDBZT 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:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 8.192V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±0.2%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 130µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 110 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4040B82IDBZT FAQ

1.How can I place an order for LM4040B82IDBZT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040B82IDBZT 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 LM4040B82IDBZT reliable?

The price and inventory of LM4040B82IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B82IDBZT is usually 5 days.

3.What payment methods are accepted for LM4040B82IDBZT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B82IDBZT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040B82IDBZT?

LM4040B82IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040B82IDBZT 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 LM4040B82IDBZT?

For technical support, including LM4040B82IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B82IDBZT requirements.

6.How does Aetrix verify that LM4040B82IDBZT is sourced from the original manufacturer or authorized distributors?

All LM4040B82IDBZT 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 LM4040B82IDBZT meets industry standards.

7.What is the process for return or replacement of LM4040B82IDBZT?

All LM4040B82IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B82IDBZT, 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 LM4040B82IDBZT part is unused and in its original packaging.

Return procedure for LM4040B82IDBZT:

1.Submit a request within 90 days.

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

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