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

Texas Instruments LM4040D82ILPR

Name: LM4040D82ILPR
Brand: Texas Instruments
SKU: LM4040D82ILPR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040D82ILPR

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: LM4040D82ILPR.pdf

Description:: IC VREF SHUNT 1% TO92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM4040D82ILPR from Texas Instruments is a precision micropower shunt voltage reference with 8.192V nominal output, ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, capacitor-free reference in analog-to-digital converters and sensor signal conditioning circuits.

For engineers reviewing the LM4040D82ILPR datasheet, LM4040D82ILPR pinout, LM4040D82ILPR application, or LM4040D82ILPR equivalent, key selection criteria include its 8.192V fixed output, industrial temperature range (–40°C to +85°C), SOT-23-3 package compatibility, and low-noise performance in high-resolution data acquisition systems.

Technical Context

The LM4040D82ILPR operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 8.192V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design ensures stable regulation without external capacitors, even under varying load and supply conditions.

It features low dynamic impedance (≤1.1Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm over 1000 hours - enabling reliable voltage referencing in field transmitters and energy infrastructure monitoring where calibration drift must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	8.192V nominal; enables direct interface with 13-bit ADCs using V_REF = V_DD/2ⁿ scaling.
Initial Accuracy	±1.0% max at 25°C; defines worst-case offset in precision sensor front-ends before trimming.
Temp Coefficient	150ppm/°C max; contributes ≤±0.78V drift over –40°C to +85°C ambient range.
Operating Current	45μA to 15mA cathode range; supports ultra-low-power portable designs and high-current buffer stages.
Output Noise	35μVRMS (10Hz–10kHz); avoids quantization noise floor elevation in 16-bit+ data converters.
Dynamic Impedance	≤1.1Ω at 1mA; maintains <±0.1% regulation error under 1mA load transients.
Thermal Hysteresis	0.08%; limits repeatability error after thermal cycling in outdoor metering applications.

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount compatible, rated for industrial temperature range (–40°C to +85°C).

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current input	Connects to regulated voltage node; sinks current to establish 8.192V reference potential.
Anode (Pin 2)	Common ground reference	Must be tied to system ground; forms return path for cathode current and defines reference zero.
NC (Pin 3)	No internal connection	Left unconnected; no electrical function - not used for biasing or noise suppression.

Key Features

Feature	Design Value
Capacitor-free stability	Operates reliably with any capacitive load up to 10μF; eliminates BOM cost and layout area for output capacitor.
Micropower operation	45μA minimum cathode current enables use in battery-powered field instruments with multi-year runtime.
Extended temp range	Specified from –40°C to +85°C; supports deployment in automotive engine compartments and industrial control cabinets.
Low noise performance	35μVRMS broadband noise preserves SNR in precision instrumentation amplifiers and sigma-delta ADCs.
Zener-zap trimming	Fuse-based wafer-level calibration achieves ±1.0% initial tolerance without post-package adjustment.

Applications

Energy Infrastructure Monitoring	Analog Input Module
Use Scenario: High-voltage DC bus sensing in solar inverters and smart grid meters. IC Role / Device Role / Timing Role: Provides stable 8.192V reference for isolated ADCs measuring 0–1000V inputs via resistive dividers. Use Value: Enables ±0.5% full-scale measurement accuracy over temperature without recalibration.	Use Scenario: Modular PLC analog input cards accepting 4–20mA or ±10V signals. IC Role / Device Role / Timing Role: Supplies precision reference to dual-slope or SAR ADCs digitizing sensor outputs. Use Value: Maintains 12-bit effective resolution despite 85°C cabinet temperatures and EMI exposure.
Field Transmitter	Precision Audio
Use Scenario: Loop-powered 4–20mA temperature/pressure transmitters in oil & gas facilities. IC Role / Device Role / Timing Role: Sets excitation voltage for RTDs and bridge sensors while sharing loop power budget. Use Value: Delivers 8.192V at 45μA, leaving >3.5mA for sensor bias and transmitter electronics.	Use Scenario: Reference source for DACs and anti-aliasing filters in studio-grade audio interfaces. IC Role / Device Role / Timing Role: Stabilizes full-scale voltage for 24-bit audio DACs requiring sub-10μV noise floor. Use Value: 35μVRMS noise prevents audible hiss; 150ppm/°C TC avoids pitch drift during warm-up.

Energy Infrastructure Monitoring

Analog Input Module

Use Scenario: High-voltage DC bus sensing in solar inverters and smart grid meters.

IC Role / Device Role / Timing Role: Provides stable 8.192V reference for isolated ADCs measuring 0–1000V inputs via resistive dividers.

Use Value: Enables ±0.5% full-scale measurement accuracy over temperature without recalibration.

Use Scenario: Modular PLC analog input cards accepting 4–20mA or ±10V signals.

IC Role / Device Role / Timing Role: Supplies precision reference to dual-slope or SAR ADCs digitizing sensor outputs.

Use Value: Maintains 12-bit effective resolution despite 85°C cabinet temperatures and EMI exposure.

Field Transmitter

Precision Audio

Use Scenario: Loop-powered 4–20mA temperature/pressure transmitters in oil & gas facilities.

IC Role / Device Role / Timing Role: Sets excitation voltage for RTDs and bridge sensors while sharing loop power budget.

Use Value: Delivers 8.192V at 45μA, leaving >3.5mA for sensor bias and transmitter electronics.

Use Scenario: Reference source for DACs and anti-aliasing filters in studio-grade audio interfaces.

IC Role / Device Role / Timing Role: Stabilizes full-scale voltage for 24-bit audio DACs requiring sub-10μV noise floor.

Use Value: 35μVRMS noise prevents audible hiss; 150ppm/°C TC avoids pitch drift during warm-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL4050C82IDBZR	8.192V, ±0.5% initial accuracy, 100ppm/°C TC, SOT-23-3, same industrial temp range	Higher accuracy grade; tighter TC improves drift-critical applications like calibration equipment	Select when ±0.5% tolerance and lower drift are required, accepting higher unit cost
MAX6008AEUR+T	8.192V, ±0.2% initial accuracy, 75ppm/°C TC, SOT-23-3, –40°C to +85°C	Superior TC and accuracy; optimized for low-noise medical instrumentation	Choose for highest stability where long-term calibration integrity is mandatory

Compared with LM4040D82ILPR, TL4050C82IDBZR offers improved accuracy and temperature coefficient at moderate cost increase, while MAX6008AEUR+T delivers best-in-class stability for metrology-grade systems - both require no PCB changes but provide measurable improvement in reference-induced error budgets.

Availability

LM4040D82ILPR is available at Aetrix Electronics and suitable for energy infrastructure monitoring, analog input modules, field transmitters, and precision audio systems requiring stable component supply across extended production lifecycles.

Supply support for LM4040D82ILPR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.

The LM4040 series was designed specifically for high-accuracy, low-power shunt voltage referencing in space-constrained and thermally demanding applications - targeting data acquisition, sensor conditioning, and industrial control systems.

FAQ

What is the maximum cathode current rating for LM4040D82ILPR?

The LM4040D82ILPR has an absolute maximum cathode current rating of 25mA per its datasheet Absolute Maximum Ratings table. However, the recommended operating condition specifies a maximum of 15mA to ensure stable regulation and thermal reliability within the SOT-23-3 package's 206°C/W junction-to-ambient thermal resistance. Exceeding 15mA may cause excessive self-heating and output voltage shift in the LM4040D82ILPR.

Does LM4040D82ILPR require an output capacitor for stability?

No, the LM4040D82ILPR does not require an output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads, including up to 10μF, making it ideal for space-constrained PCB layouts. This eliminates capacitor-related aging, leakage, and ESR effects that could degrade long-term accuracy in the LM4040D82ILPR reference path.

What is the thermal hysteresis specification for LM4040D82ILPR?

The LM4040D82ILPR exhibits 0.08% thermal hysteresis, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to +125°C. This low hysteresis ensures repeatable reference voltage behavior in cyclic thermal environments such as outdoor energy meters or automotive ECUs, directly contributing to measurement consistency in the LM4040D82ILPR-based systems.

Can LM4040D82ILPR be used in automotive under-hood applications?

The LM4040D82ILPR is characterized for –40°C to +85°C operation and is not qualified for automotive under-hood use (which typically requires AEC-Q100 Grade 1 or Grade 0, –40°C to +125°C). For such applications, TI's LM4040Q series (e.g., LM4040D82Q) - qualified to AEC-Q100 and specified to –40°C to +125°C - should be selected instead of the LM4040D82ILPR.

How does the 8.192V output of LM4040D82ILPR benefit data acquisition systems?

The 8.192V output of LM4040D82ILPR aligns precisely with binary scaling for 13-bit ADCs (2¹³ = 8192), enabling full-scale utilization without gain adjustment. When used as V_REF, it allows direct mapping of 0–8.192V input ranges to digital codes 0–8191, maximizing resolution and minimizing code-width errors in the LM4040D82ILPR-referenced data acquisition chain.

LM4040D82ILPR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Series:: -

Packaging:: Cut Tape (CT)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Fixed

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

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 150ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 130µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 115 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

LM4040D82ILPR FAQ

1.How can I place an order for LM4040D82ILPR through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040D82ILPR 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 LM4040D82ILPR reliable?

The price and inventory of LM4040D82ILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D82ILPR is usually 5 days.

3.What payment methods are accepted for LM4040D82ILPR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D82ILPR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040D82ILPR?

LM4040D82ILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040D82ILPR 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 LM4040D82ILPR?

For technical support, including LM4040D82ILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D82ILPR requirements.

6.How does Aetrix verify that LM4040D82ILPR is sourced from the original manufacturer or authorized distributors?

All LM4040D82ILPR 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 LM4040D82ILPR meets industry standards.

7.What is the process for return or replacement of LM4040D82ILPR?

All LM4040D82ILPR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D82ILPR, 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 LM4040D82ILPR part is unused and in its original packaging.

Return procedure for LM4040D82ILPR:

1.Submit a request within 90 days.

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

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