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Analog Devices Inc./Maxim Integrated LM4040DEX3-2.1
- Part No.:
- LM4040DEX3-2.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-2.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,919
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Product details
Overview
LM4040DEX3-2.1 from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, rated for -40°C to +125°C operation, with ±1.0% initial accuracy, ±150ppm/°C temperature coefficient, and 60μA–15mA operating current range. It delivers stable reverse-breakdown voltage for analog-to-digital converter (ADC) reference, portable battery-powered instrumentation, and industrial sensor signal conditioning.
For engineers reviewing the LM4040DEX3-2.1 datasheet, LM4040DEX3-2.1 pinout, LM4040DEX3-2.1 application, or LM4040DEX3-2.1 equivalent, key selection criteria include guaranteed extended-temperature performance, no-output-capacitor stability, low dynamic impedance (≤1.1Ω), subminiature SC70 footprint, and compatibility with high-impedance bias networks in space-constrained embedded systems.
Technical Context
The LM4040DEX3-2.1 uses bandgap-based shunt regulation to maintain a precise 2.048V reverse breakdown voltage across its cathode-anode terminals without requiring external capacitors. Its internal architecture eliminates need for series pass elements or feedback loops-current sinking is self-regulated via reverse-biased junction behavior.
It operates over 60μA–15mA shunt current while maintaining ≤±1.98% total overtemperature tolerance (±1.0% initial + ±150ppm/°C × 100°C ΔT) and exhibits low 28μVRMS wideband noise (10Hz–10kHz). The device tolerates any capacitive load and remains stable under transient current steps up to ±2.5mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±20mV (±1.0%) initial tolerance at +25°C - defines absolute ADC reference accuracy baseline |
| Temperature Coefficient | ±150ppm/°C max over -40°C to +125°C - contributes ≤±0.307V drift across full range, critical for thermal stability |
| Operating Current Range | 60μA to 15mA - supports ultra-low-power sensor biasing and higher-current DAC references without external buffering |
| Dynamic Impedance | ≤1.1Ω at 1mA, 120Hz - ensures minimal output voltage shift under load transients (e.g., SAR ADC sampling bursts) |
| Wideband Noise | 28μVRMS (10Hz–10kHz) - enables high-resolution (≥16-bit) data acquisition without added filtering |
| Long-Term Stability | 120ppm after 1000h - guarantees reference drift <0.025% over 1 year, reducing calibration frequency in field-deployed equipment |
| Package | SC70-3 (1.8mm × 1.8mm) - 50% smaller than SOT23, enabling placement in dense PCB layouts near precision analog ICs |
Pinout & Package
LM4040DEX3-2.1 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm × 0.9mm height), RoHS-compliant and lead-free. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode (reverse-bias input) | Connected to positive supply rail; sinks shunt current to regulate voltage at pin 2 |
| 2 (–) | Anode (reference output) | Provides stable 2.048V reference node; connects to ADC REF+, op-amp non-inverting input, or sensor excitation |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; not internally bonded - prevents unintended parasitic paths |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load (0–∞), eliminating BOM cost and layout area for stabilization caps in portable designs |
| Extended temperature grade | Rated for -40°C to +125°C operation - suitable for under-hood automotive sensors and industrial process controllers |
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - enables placement directly adjacent to precision ADCs or microcontrollers without routing congestion |
| Low quiescent current capability | Regulates down to 60μA - supports coin-cell-powered devices and energy-harvesting systems with microamp-level budgets |
| High shunt current capacity | Handles up to 15mA - allows direct driving of multiple analog front-end stages without external buffers |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered handheld blood glucose meter with 16-bit ADC and low-power MCU. IC Role / Device Role / Timing Role: Provides primary 2.048V reference for ADC conversion of electrochemical sensor output. Use Value: ±1.0% initial accuracy and ±150ppm/°C TC ensure <±0.5% total error across operating temperature, meeting ISO 15197 clinical accuracy requirements. |
Use Scenario: DIN-rail-mounted PLC analog input module measuring 4–20mA current loops. IC Role / Device Role / Timing Role: Supplies stable reference for precision current-to-voltage conversion and multiplexed ADC sequencing. Use Value: 60μA–15mA operating range accommodates varying channel count and sampling rate without redesign; SC70 size enables 16-channel density. |
| Automotive Cabin Sensors | Wireless IoT Node Reference |
Use Scenario: Occupant detection system using thermopile array and low-noise amplifier in vehicle cabin. IC Role / Device Role / Timing Role: Low-noise 2.048V reference for sigma-delta ADC digitizing thermal IR signals. Use Value: 28μVRMS noise floor preserves SNR >90dB, enabling sub-0.1°C temperature resolution despite engine-off thermal cycling. |
Use Scenario: LoRaWAN soil moisture sensor powered by solar harvester with intermittent 3.3V rail. IC Role / Device Role / Timing Role: Micropower shunt reference enabling ADC operation during brief charge cycles. Use Value: 60μA minimum operating current allows reliable regulation even when harvested energy drops below 100μW, extending deployment life. |
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 1.24V–18V shunt; 0.5% initial accuracy; 90ppm/°C TC; SOT23-3 | Requires two external resistors to set 2.048V; higher minimum cathode current (80μA) | Select when design flexibility for multiple reference voltages is needed; verify resistor tolerance impact on final accuracy. |
| MAX6008AEUR+T | Fixed 2.048V; 0.1% initial accuracy; 50ppm/°C TC; SOT23-3; 100μA–25mA range | Tighter accuracy and lower TC, but larger SOT23 footprint and higher minimum current | Choose for metrology-grade systems where long-term stability and thermal drift dominate over board space. |
Compared with LM4040DEX3-2.1, TLVH431ACDBVR offers configurability at the cost of accuracy and external component count, while MAX6008AEUR+T delivers superior precision and thermal performance in a less space-efficient package-making LM4040DEX3-2.1 optimal for cost-sensitive, high-density extended-temperature applications.
Availability
LM4040DEX3-2.1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040DEX3-2.1 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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications, emphasizing high reliability and parametric consistency.
The LM4040 product line delivers micropower, fixed-output shunt voltage references optimized for space-constrained, extended-temperature systems where passive stability and zero-output-capacitor operation are mandatory design requirements.
FAQ
What is the guaranteed operating temperature range for LM4040DEX3-2.1?
The LM4040DEX3-2.1 is specified for continuous operation from -40°C to +125°C. This extended temperature grade is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, making it suitable for under-hood automotive and industrial control environments where ambient temperatures exceed +85°C.
Does LM4040DEX3-2.1 require an external output capacitor for stability?
No, the LM4040DEX3-2.1 does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load, including 0μF. This is explicitly stated in the General Description and Applications Information sections, eliminating capacitor-related BOM cost and layout constraints in portable and high-density designs.
What is the minimum shunt current needed for LM4040DEX3-2.1 to maintain regulation?
The LM4040DEX3-2.1 requires a minimum shunt current of 60μA to maintain regulation across its full temperature range. This value is specified in the Electrical Characteristics tables for the D-grade variant and is validated for operation at -40°C and +125°C, ensuring reliable startup and regulation in ultra-low-power applications.
How does the pin configuration of LM4040DEX3-2.1 differ from standard three-terminal references?
The LM4040DEX3-2.1 uses a two-terminal functional configuration in a three-pin SC70 package: pin 1 is cathode (+), pin 2 is anode (–), and pin 3 is N.C. (no connection). Pin 3 must remain unconnected or tied to pin 2 - it is not internally bonded and serves only mechanical alignment. This differs from three-terminal series references that use separate input/output/control pins.
What is the typical wideband noise performance of LM4040DEX3-2.1?
The LM4040DEX3-2.1 delivers 28μVRMS wideband noise over 10Hz–10kHz, measured at 100μA shunt current. This low-noise specification is documented in the Electrical Characteristics table for the 2.048V version and supports high-resolution data acquisition systems (e.g., 16-bit+ ADCs) without requiring additional filtering stages.
LM4040DEX3-2.1 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):
- 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:
- SC-70-3
LM4040DEX3-2.1 FAQ
1.How can I place an order for LM4040DEX3-2.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-2.1 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 LM4040DEX3-2.1 reliable?
The price and inventory of LM4040DEX3-2.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEX3-2.1 is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-2.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-2.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-2.1?
LM4040DEX3-2.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-2.1 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 LM4040DEX3-2.1?
For technical support, including LM4040DEX3-2.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-2.1 requirements.
6.How does Aetrix verify that LM4040DEX3-2.1 is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-2.1 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 LM4040DEX3-2.1 meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-2.1?
All LM4040DEX3-2.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-2.1, 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 LM4040DEX3-2.1 part is unused and in its original packaging.
Return procedure for LM4040DEX3-2.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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