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

Texas Instruments LM4040D41ILP

Name: LM4040D41ILP
Brand: Texas Instruments
SKU: LM4040D41ILP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040D41ILP

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4040D41ILP.pdf

Description:: IC VREF SHUNT 1% TO92-3

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Product details

Overview

LM4040D41ILP from Texas Instruments is a precision 4.096V shunt voltage reference in SOT-23-3 (DBZ) package, rated for industrial temperature range (–40°C to +85°C), with ±1.0% initial accuracy, 150ppm/°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 LM4040D41ILP datasheet, LM4040D41ILP pinout, LM4040D41ILP application, or LM4040D41ILP equivalent, key selection criteria include output voltage tolerance over temperature, minimum operating current, dynamic impedance at 1mA, noise performance in 10Hz–10kHz bandwidth, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040D41ILP operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 4.096V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed bandgap architecture delivers predictable voltage regulation with no external components required.

It features low dynamic impedance (≤1.1Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm after 1000 hours. The device is characterized across –40°C to +85°C and supports operation with any capacitive load - including direct connection to ADC reference inputs or op-amp feedback networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096V nominal at IZ = 100μA, 25°C - matches standard 12-bit DAC/ADC full-scale reference points.
Initial Accuracy	±1.0% max at 25°C - corresponds to ±41mV tolerance, defining baseline calibration error budget.
Temp Coefficient	150ppm/°C max - contributes ≤±625μV/°C drift over industrial range, critical for temperature-sensitive measurements.
Min Cathode Current	45μA typical - enables ultra-low-power operation in battery-powered sensor nodes and energy-harvesting systems.
Wideband Noise	35μVRMS (10Hz–10kHz) - limits noise contribution in high-resolution (≥16-bit) data acquisition front-ends.
Dynamic Impedance	≤1.1Ω at IZ = 1mA - ensures minimal output voltage shift under varying load current, improving PSRR in regulator feedback paths.
Operating Temp Range	–40°C to +85°C - qualified for industrial control, PLC analog I/O modules, and automotive body electronics.

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, gull-wing leads. RoHS-compliant, moisture sensitivity level (MSL) 1.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current input / voltage sense node	Connected to supply rail via series resistor; voltage develops across this terminal relative to anode.
Anode (Pin 2)	Common reference / ground return	Typically tied to system ground; forms the 0V reference point for V_Z measurement.
NC (Pin 3)	No internal connection	Unused terminal; must be left floating or tied to anode per EMI mitigation guidance in datasheet.

Key Features

Feature	Design Value
Fixed 4.096V output	Exact match to 2¹² scaling for 12-bit systems - eliminates need for external gain/attenuation in ADC reference design.
No output capacitor required	Stable with all capacitive loads up to ≥10μF - simplifies layout and reduces BOM count in space-constrained modules.
Low 35μVRMS noise	Enables <18-bit effective resolution in precision sigma-delta ADCs without additional filtering stages.
45μA min operating current	Supports operation from micro-power LDOs or high-value bias resistors - extends battery life in portable instrumentation.
150ppm/°C tempco	Guarantees <±5mV total drift over –40°C to +85°C - meets Class A accuracy requirements in industrial transmitters.

Applications

Industrial Analog Input Module	Data-Acquisition System
Use Scenario: 16-channel 24-bit isolated analog input module for PLC backplane. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADCs and programmable gain instrumentation amplifiers. Use Value: 4.096V output enables exact full-scale mapping for 24-bit codes; ±1.0% tolerance allows single-point factory calibration.	Use Scenario: Portable handheld multimeter with dual-slope and sigma-delta ADCs. IC Role / Device Role / Timing Role: Stable reference source for auto-zeroing and ratiometric sensor excitation. Use Value: 35μVRMS noise ensures <0.001% measurement repeatability; 45μA min current supports >10-year battery life.
Field Transmitter	Energy Infrastructure Monitor
Use Scenario: 4–20mA HART-enabled pressure transmitter with loop-powered design. IC Role / Device Role / Timing Role: Reference for DAC generating 4–20mA current setpoint and ADC measuring sensor bridge output. Use Value: 150ppm/°C tempco maintains <0.1% span error over –40°C to +85°C ambient; NC pin tied to anode suppresses EMI-induced offset.	Use Scenario: Smart electricity meter with metrology-grade ADC and anti-tampering monitoring. IC Role / Device Role / Timing Role: Precision reference for polyphase energy measurement ICs (e.g., ADE78xx family). Use Value: Long-term stability of 120ppm ensures <0.01% accuracy drift over 10-year service life; SOT-23 package fits tight meter PCB layouts.

Industrial Analog Input Module

Data-Acquisition System

Use Scenario: 16-channel 24-bit isolated analog input module for PLC backplane.

IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADCs and programmable gain instrumentation amplifiers.

Use Value: 4.096V output enables exact full-scale mapping for 24-bit codes; ±1.0% tolerance allows single-point factory calibration.

Use Scenario: Portable handheld multimeter with dual-slope and sigma-delta ADCs.

IC Role / Device Role / Timing Role: Stable reference source for auto-zeroing and ratiometric sensor excitation.

Use Value: 35μVRMS noise ensures <0.001% measurement repeatability; 45μA min current supports >10-year battery life.

Field Transmitter

Energy Infrastructure Monitor

Use Scenario: 4–20mA HART-enabled pressure transmitter with loop-powered design.

IC Role / Device Role / Timing Role: Reference for DAC generating 4–20mA current setpoint and ADC measuring sensor bridge output.

Use Value: 150ppm/°C tempco maintains <0.1% span error over –40°C to +85°C ambient; NC pin tied to anode suppresses EMI-induced offset.

Use Scenario: Smart electricity meter with metrology-grade ADC and anti-tampering monitoring.

IC Role / Device Role / Timing Role: Precision reference for polyphase energy measurement ICs (e.g., ADE78xx family).

Use Value: Long-term stability of 120ppm ensures <0.01% accuracy drift over 10-year service life; SOT-23 package fits tight meter PCB layouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL4050C41IDBZR	Same 4.096V output, ±0.5% initial accuracy (C grade), 100ppm/°C tempco, 20μVRMS noise.	Better accuracy/noise, but requires ≥60μA min current and only rated to +70°C ambient.	Select when higher precision and lower noise justify tighter current budget and reduced temperature margin.
REF3040AIDBZR	4.096V series reference, ±0.2% accuracy, 50ppm/°C tempco, 28μVRMS noise, 50μA quiescent current.	Three-terminal architecture; supplies load current instead of sinking it - incompatible pinout and biasing.	Choose for applications needing load-driving capability or where supply headroom permits series topology.

Compared with TL4050C41IDBZR and REF3040AIDBZR, the LM4040D41ILP offers the lowest minimum operating current and widest industrial temperature rating, making it optimal for ultra-low-power, wide-temperature embedded sensing - though with relaxed accuracy and higher noise than alternatives.

Availability

LM4040D41ILP is available at Aetrix Electronics and suitable for industrial analog input modules, field transmitters, and portable data-acquisition systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LM4040D41ILP 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, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and industrial-grade components.

The LM4040 series was designed specifically for cost-sensitive, space-constrained applications demanding stable voltage references without external components - targeting industrial automation, test equipment, and sensor interface markets.

FAQ

What is the maximum cathode current rating for LM4040D41ILP?

The absolute maximum continuous cathode current for LM4040D41ILP is 25mA, as specified in Section 6.1 of the datasheet. Operation above this limit risks permanent damage. For reliable long-term performance, TI recommends limiting cathode current to ≤15mA under normal conditions, especially at elevated ambient temperatures.

Does LM4040D41ILP require an output capacitor for stability?

No, LM4040D41ILP is inherently stable with all capacitive loads and does not require an external output capacitor. This is confirmed in the Features section and Section 3 Description of the datasheet. Adding capacitance may even improve transient response in noisy environments, but is never mandatory.

What is the thermal hysteresis specification for LM4040D41ILP?

The thermal hysteresis for LM4040D41ILP is 0.08%, defined as the voltage difference measured at 25°C after cycling between –40°C and +125°C. This value is consistent across all grades and packages, and appears in Tables 6.5–6.22 of the datasheet under the VHYST parameter.

Can LM4040D41ILP be used in automotive applications?

LM4040D41ILP is qualified for the industrial temperature range (–40°C to +85°C), not the full automotive AEC-Q100 Grade 1 (–40°C to +125°C) range. While it may function in some under-hood or cabin applications, TI does not certify or guarantee performance beyond its specified industrial rating - use LM4040D41Q (Q-grade) for automotive-qualified designs.

How does the 4.096V output of LM4040D41ILP benefit data converter systems?

The 4.096V output of LM4040D41ILP directly corresponds to 2¹², enabling exact full-scale mapping for 12-bit ADCs/DACs without scaling resistors. In higher-resolution systems, it provides a clean, low-noise reference that simplifies digital calibration and improves effective number of bits (ENOB) by minimizing reference-related quantization uncertainty.

LM4040D41ILP Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

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

Series:: -

Packaging:: Bulk

Product Status:: Active

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 4.096V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 150ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 80µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 88 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

LM4040D41ILP FAQ

1.How can I place an order for LM4040D41ILP through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040D41ILP 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 LM4040D41ILP reliable?

The price and inventory of LM4040D41ILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D41ILP is usually 5 days.

3.What payment methods are accepted for LM4040D41ILP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D41ILP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040D41ILP?

LM4040D41ILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040D41ILP 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 LM4040D41ILP?

For technical support, including LM4040D41ILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D41ILP requirements.

6.How does Aetrix verify that LM4040D41ILP is sourced from the original manufacturer or authorized distributors?

All LM4040D41ILP 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 LM4040D41ILP meets industry standards.

7.What is the process for return or replacement of LM4040D41ILP?

All LM4040D41ILP units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D41ILP, 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 LM4040D41ILP part is unused and in its original packaging.

Return procedure for LM4040D41ILP:

1.Submit a request within 90 days.

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

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