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Analog Devices Inc./Maxim Integrated LM4040DEM3-2.1
- Part No.:
- LM4040DEM3-2.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040DEM3-2.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
LM4040DEM3-2.1 from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring 1.0% initial accuracy, ±150ppm/°C temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse breakdown voltage with 60μA–15mA shunt current capability and low 28μVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy analog sensing and battery-powered instrumentation.
For engineers reviewing the LM4040DEM3-2.1 datasheet, LM4040DEM3-2.1 pinout, LM4040DEM3-2.1 application, or LM4040DEM3-2.1 equivalent, key selection criteria include its fixed 2.048V output, extended temperature range, SC70 footprint compatibility, and absence of required output capacitance-critical for space-constrained, thermally demanding embedded systems.
Technical Context
The LM4040DEM3-2.1 uses bandgap-based shunt regulation to maintain a precise 2.048V reverse breakdown voltage across its cathode-anode terminals. Its internal laser-trimmed resistor network sets initial accuracy at 1.0%, while its temperature coefficient is specified at ±150ppm/°C over –40°C to +125°C.
It operates as a two-terminal device requiring only an external series resistor to set shunt current between 60μA and 15mA. No external capacitor is needed for stability-even with arbitrary capacitive loads-and dynamic impedance remains ≤1.1Ω at 1mA, ensuring minimal voltage variation under load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±20mV tolerance at +25°C (1.0% grade) |
| Initial Accuracy | ±1.0% max at +25°C; ensures reference error ≤20.5mV in production calibration |
| Temp Coefficient | ±150ppm/°C max; contributes ≤±19.5mV drift over –40°C to +125°C |
| Operating Current | 60μA to 15mA shunt range; supports ultra-low-power and high-current regulation |
| Dynamic Impedance | ≤1.1Ω at 1mA; minimizes load-induced voltage deviation during transient events |
| Wideband Noise | 28μVRMS (10Hz–10kHz); suitable for 12-bit ADC reference without additional filtering |
| Temperature Range | –40°C to +125°C; qualified for automotive under-hood and industrial control environments |
Pinout & Package
LM4040DEM3-2.1 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is no-connect (N.C.) and must be left unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node (e.g., ADC VREF) |
| 2 (–) | Anode | Reference ground return; ties to system GND or low-impedance analog ground |
| 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 enables placement in dense portable PCB layouts |
| No output capacitor required | Eliminates BOM cost and layout area for stability capacitor; simplifies design validation |
| Tolerates arbitrary capacitive loads | Enables direct connection to ADC input caps or long traces without oscillation risk |
| Extended temperature qualification | –40°C to +125°C rating supports industrial motor drives and automotive body controllers |
| Low 28μVRMS noise | Meets SNR requirements for 12-bit SAR ADCs without external filtering |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor using 12-bit ADC for analog sensor signal digitization. IC Role / Device Role / Timing Role: Precision 2.048V shunt reference supplying stable VREF to ADC, rejecting supply ripple and thermal drift. Use Value: Enables <±1 LSB INL over temperature with no external filter, reducing component count and power consumption. | Use Scenario: Remote environmental sensor node powered by coin cell, logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Low-current shunt reference (60μA min) maintaining accuracy during intermittent active cycles. Use Value: Extends battery life beyond 5 years while preserving measurement fidelity across –20°C to +70°C ambient range. |
| Industrial Process Transmitters | Automotive Cabin Control Modules |
Use Scenario: 4–20mA loop-powered pressure transmitter operating in factory environments up to +85°C. IC Role / Device Role / Timing Role: Primary voltage reference for DAC and signal conditioning circuitry, referenced to loop ground. Use Value: Guarantees <±0.25% total error over full temperature range without recalibration, meeting SIL-2 functional safety margins. | Use Scenario: HVAC control unit mounted near vehicle dashboard, exposed to rapid ambient shifts from –40°C cold soak to +85°C sun load. IC Role / Device Role / Timing Role: Stable 2.048V reference for microcontroller ADC measuring thermistor and potentiometer inputs. Use Value: Maintains <±10mV reference error across full automotive temperature profile, eliminating software compensation tables. |
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 | Adjustable (2.5V–36V) 3-terminal shunt; 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 | Requires external resistors to set 2.048V; higher minimum cathode current (80μA) | Choose when adjustable output or higher accuracy at lower tempco is prioritized over fixed-voltage simplicity |
| MAX6008AEUR+T | Fixed 2.048V; 0.1% initial accuracy; 50ppm/°C tempco; SC70-3; 100μA–20mA operating range | Higher accuracy and lower tempco but narrower current range and higher quiescent current floor | Choose when metrology-grade stability is required and 100μA minimum current is acceptable |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040DEM3-2.1 offers the smallest footprint and lowest minimum operating current (60μA), making it optimal for ultra-compact, ultra-low-power designs where fixed 2.048V suffices and sub-0.5% accuracy is not mandatory.
Availability
LM4040DEM3-2.1 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process transmitters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM4040DEM3-2.1 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 references optimized for space-constrained, thermally demanding systems where fixed-output voltage, low noise, and zero-capacitor stability are essential.
FAQ
What is the exact output voltage tolerance of LM4040DEM3-2.1 at room temperature?
The LM4040DEM3-2.1 has a nominal output voltage of 2.048V with ±20mV (±1.0%) tolerance at +25°C, per the D-grade specification. This corresponds to a guaranteed range of 2.028V to 2.068V under standard test conditions, confirmed in the Electrical Characteristics table for the 2.048V variant.
Does LM4040DEM3-2.1 require an external capacitor for stability?
No, LM4040DEM3-2.1 does not require an external output capacitor for stability. The device is designed to remain stable with any capacitive load-including direct connection to ADC input capacitors or long PCB traces-eliminating the need for added components or layout constraints.
What is the minimum shunt current required for LM4040DEM3-2.1 to regulate properly?
The LM4040DEM3-2.1 requires a minimum shunt current of 60μA to maintain regulation across its full temperature range (–40°C to +125°C). Below this threshold, output voltage accuracy degrades significantly, and the device may exit regulation entirely.
Can LM4040DEM3-2.1 be used in automotive under-hood applications?
Yes, LM4040DEM3-2.1 is rated for operation from –40°C to +125°C and is qualified for extended-temperature industrial and automotive cabin applications. While not AEC-Q200 certified, its guaranteed performance over this range supports use in non-safety-critical under-dash modules such as climate control or infotainment power supplies.
How does the temperature coefficient of LM4040DEM3-2.1 affect its output over –40°C to +125°C?
The LM4040DEM3-2.1 has a maximum temperature coefficient of ±150ppm/°C. Over a 165°C span (–40°C to +125°C), this contributes up to ±24.75mV drift relative to the 2.048V nominal output-resulting in a worst-case total output variation of ±34.75mV including initial tolerance.
LM4040DEM3-2.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040DEM3-2.1 FAQ
1.How can I place an order for LM4040DEM3-2.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEM3-2.1 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 LM4040DEM3-2.1 reliable?
The price and inventory of LM4040DEM3-2.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEM3-2.1 is usually 5 days.
3.What payment methods are accepted for LM4040DEM3-2.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEM3-2.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEM3-2.1?
LM4040DEM3-2.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEM3-2.1 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 LM4040DEM3-2.1?
For technical support, including LM4040DEM3-2.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEM3-2.1 requirements.
6.How does Aetrix verify that LM4040DEM3-2.1 is sourced from the original manufacturer or authorized distributors?
All LM4040DEM3-2.1 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 LM4040DEM3-2.1 meets industry standards.
7.What is the process for return or replacement of LM4040DEM3-2.1?
All LM4040DEM3-2.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEM3-2.1, 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 LM4040DEM3-2.1 part is unused and in its original packaging.
Return procedure for LM4040DEM3-2.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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