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Analog Devices Inc./Maxim Integrated LM4040DEX3-4.1-T
- Part No.:
- LM4040DEX3-4.1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-4.1-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
LM4040DEX3-4.1-T from Maxim Integrated is a precision 4.096V two-terminal shunt voltage reference in SC70-3 package, featuring 1.0% initial accuracy, ±150ppm/°C temperature coefficient, 60μA–15mA operating current range, and guaranteed operation from –40°C to +125°C - ideal for high-reliability battery-powered instrumentation and industrial sensor signal conditioning.
For engineers reviewing the LM4040DEX3-4.1-T datasheet, LM4040DEX3-4.1-T pinout, LM4040DEX3-4.1-T application, or LM4040DEX3-4.1-T equivalent, key selection criteria include reverse breakdown voltage tolerance over temperature, dynamic impedance at low current, wideband noise performance, and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4040DEX3-4.1-T uses bandgap-based shunt regulation to maintain a stable 4.096V output across cathode-to-anode reverse currents from 60μA to 15mA. Its internal architecture eliminates need for external output capacitance while tolerating any capacitive load, enabling direct integration into space-constrained analog front-ends.
Designed for extended temperature operation, it guarantees ±41mV (±1.0%) total reverse breakdown voltage tolerance over –40°C to +125°C, with worst-case drift dominated by its ±150ppm/°C tempco at 100µA bias. Dynamic impedance remains ≤1.3Ω at 1mA, ensuring minimal voltage shift under load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Breakdown Voltage | 4.096V nominal; ±41mV max tolerance at +25°C, ±81mV over full –40°C to +125°C range |
| Initial Accuracy Grade | D-grade: ±1.0% at +25°C - enables cost-sensitive designs where tighter tolerance is not required |
| Temperature Coefficient | ±150ppm/°C max - defines worst-case voltage drift per degree over operating range |
| Operating Current Range | 60μA minimum to 15mA maximum - supports ultra-low-power sensing and higher-current reference buffering |
| Dynamic Impedance | ≤1.3Ω at 1mA, 120Hz - ensures <13mV output shift for 10mA load step changes |
| Wideband Noise | 64µVRMS (10Hz–10kHz) - critical for high-resolution ADC reference applications |
| Package | SC70-3 (1.8mm × 1.8mm) - 50% smaller than SOT23, suitable for portable and dense PCB layouts |
Pinout & Package
The LM4040DEX3-4.1-T is housed in a 3-pin SC70 surface-mount package with exposed pad not connected. Pin 3 is no-connect (N.C.) and must be left unconnected or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to positive supply rail via series resistor |
| 2 (–) | Anode | Reference ground node; ties to system ground and load return path |
| 3 (N.C.) | No Connection | Must remain floating or shorted to pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - reduces board space vs. SOT23 by 50%, critical for wearables and compact modules |
| No external capacitor required | Fully stable with any output capacitance - eliminates BOM item and layout sensitivity to parasitic C |
| Extended temperature operation | –40°C to +125°C guaranteed - supports automotive under-hood and industrial control environments |
| Low quiescent current capability | 60μA minimum operating current - enables microamp-level system sleep modes without reference dropout |
| Laser-trimmed precision | 1.0% initial accuracy achieved via on-die resistor trimming - avoids post-assembly calibration in production |
Applications
| Portable Data Loggers | Industrial 4–20mA Transmitters |
|---|---|
Use Scenario: Battery-powered environmental sensors logging temperature, humidity, and pressure over multi-year deployments. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.096V excitation and ADC reference for 12-bit+ SAR converters. Use Value: 60μA minimum operating current extends battery life; ±81mV total voltage tolerance ensures measurement repeatability across temperature extremes. | Use Scenario: Loop-powered field transmitters converting RTD or thermocouple signals into standardized 4–20mA outputs. IC Role / Device Role / Timing Role: Precision shunt reference establishing accurate current-sense thresholds and DAC reference points. Use Value: ±150ppm/°C tempco and –40°C to +125°C rating ensure loop accuracy compliance over harsh ambient conditions. |
| Medical Point-of-Care Devices | Automotive Cabin Sensors |
Use Scenario: Handheld blood glucose meters and pulse oximeters requiring FDA-compliant analog signal chains. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end gain stages and ADC conversion references. Use Value: 64µVRMS wideband noise enables <14-bit ENOB in low-frequency biosignal acquisition paths. | Use Scenario: Occupancy, CO₂, and air quality sensors mounted inside vehicle cabins with wide thermal cycling. IC Role / Device Role / Timing Role: Stable reference for microcontroller ADCs monitoring HVAC and cabin air quality parameters. Use Value: SC70-3 package withstands reflow and thermal shock; D-grade accuracy meets cost targets without sacrificing reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5V adjustable (via resistors), 0.5% initial accuracy, 90ppm/°C, SOT23-3 | Requires external resistors to set 4.096V; lower tempco but fixed-voltage alternatives unavailable | Select when design flexibility justifies added components and board area |
| MAX6008AEUR+T | 4.096V fixed, 0.2% initial accuracy, 50ppm/°C, SOT23-3, 100μA–20mA | Higher accuracy and lower tempco, but larger minimum current and different package thermal profile | Select when tighter tolerance and lower drift outweigh cost and size constraints |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040DEX3-4.1-T offers lowest cost and smallest footprint for 4.096V reference needs, trading accuracy and tempco for space and power efficiency - optimal for cost-sensitive, size-constrained industrial and portable systems.
Availability
LM4040DEX3-4.1-T is available at Aetrix Electronics and suitable for portable data loggers, industrial 4–20mA transmitters, and medical point-of-care devices requiring stable component supply with long lifecycle support.
Supply support for LM4040DEX3-4.1-T 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
Maxim Integrated is a semiconductor company specializing in analog and mixed-signal ICs for industrial, communications, computing, and consumer applications.
The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, battery-operated, and high-temperature systems requiring stable reference voltages without external compensation.
FAQ
What is the exact reverse breakdown voltage of LM4040DEX3-4.1-T at +25°C?
The LM4040DEX3-4.1-T has a nominal reverse breakdown voltage of 4.096V at +25°C, with a guaranteed tolerance of ±41mV (±1.0%) per the D-grade specification. This value is laser-trimmed during production and confirmed in the Electrical Characteristics table for the 4.096V variant.
Does LM4040DEX3-4.1-T require an external output capacitor for stability?
No, the LM4040DEX3-4.1-T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference inputs or op-amp feedback networks - eliminating a common BOM and layout dependency.
What is the minimum operating current for LM4040DEX3-4.1-T across its full temperature range?
The LM4040DEX3-4.1-T requires a minimum operating current of 78µA at +25°C and up to 73µA at temperature extremes, as specified in the Electrical Characteristics table for the 4.096V D-grade variant. Maintaining ≥60µA ensures regulation integrity across –40°C to +125°C.
Can pin 3 of LM4040DEX3-4.1-T be left floating or must it be grounded?
Pin 3 of the LM4040DEX3-4.1-T is designated N.C. (no connection) and must either be left unconnected or tied directly to pin 2 (anode). The datasheet explicitly states that pin 3 is not internally bonded and connecting it elsewhere may compromise device behavior or reliability.
How does the temperature coefficient of LM4040DEX3-4.1-T affect its output over –40°C to +125°C?
The LM4040DEX3-4.1-T has a maximum temperature coefficient of ±150ppm/°C. Over the full –40°C to +125°C range (ΔT = 165°C), this contributes up to ±24.75mV drift (4.096V × 150ppm × 165),叠加 ±41mV initial tolerance yields a total worst-case output variation of ±81mV - fully characterized and guaranteed in datasheet Note 2.
LM4040DEX3-4.1-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- 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:
- 64µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 78 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040DEX3-4.1-T FAQ
1.How can I place an order for LM4040DEX3-4.1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-4.1-T 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 LM4040DEX3-4.1-T reliable?
The price and inventory of LM4040DEX3-4.1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEX3-4.1-T is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-4.1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-4.1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-4.1-T?
LM4040DEX3-4.1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-4.1-T 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 LM4040DEX3-4.1-T?
For technical support, including LM4040DEX3-4.1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-4.1-T requirements.
6.How does Aetrix verify that LM4040DEX3-4.1-T is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-4.1-T 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 LM4040DEX3-4.1-T meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-4.1-T?
All LM4040DEX3-4.1-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-4.1-T, 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 LM4040DEX3-4.1-T part is unused and in its original packaging.
Return procedure for LM4040DEX3-4.1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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