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Analog Devices Inc./Maxim Integrated LM4040DEX3-2.1+T
- Part No.:
- LM4040DEX3-2.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-2.1+T.pdf
- Description:
- IC VREF SHUNT 1% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,879
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Product details
Overview
LM4040DEX3-2.1+T 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-reliability analog sensing and power monitoring in automotive and industrial control systems.
For engineers reviewing the LM4040DEX3-2.1+T datasheet, LM4040DEX3-2.1+T pinout, LM4040DEX3-2.1+T application, or LM4040DEX3-2.1+T equivalent, key selection criteria include its extended temperature range, no-output-capacitor requirement, tolerance of capacitive loads, and compatibility with space-constrained PCB layouts using the 1.8mm × 1.8mm SC70 footprint.
Technical Context
The LM4040DEX3-2.1+T implements a bandgap-based shunt reference architecture, behaving electrically like a precision zener diode with fixed 2.048V reverse breakdown voltage. Its internal laser-trimmed resistor network ensures factory-set accuracy, while dynamic impedance remains ≤1.1Ω at 1mA (120Hz), enabling stable regulation across wide current and temperature variations.
Designed for micropower operation, it supports minimum shunt current as low as 45μA and maximum of 15mA, with no external stabilization capacitor required. The device tolerates any output capacitance and maintains stability over its full –40°C to +125°C operating range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal reverse breakdown voltage, with ±20mV tolerance at +25°C (D-grade) |
| Initial Accuracy | ±1.0% (±20.5mV) at +25°C - defines worst-case DC error before temperature drift |
| Temp Coefficient | ±150ppm/°C max - contributes up to ±15.6mV error over –40°C to +125°C range |
| Shunt Current Range | 60μA to 15mA - enables use with high-impedance bias networks and low-power microcontrollers |
| Dynamic Impedance | ≤1.1Ω at 1mA - ensures minimal voltage shift under load transients |
| Wideband Noise | 28μVRMS (10Hz–10kHz) - supports precision ADC reference applications without added filtering |
| Long-Term Stability | 120ppm after 1000h - quantifies aging-induced drift for mission-critical calibration systems |
Pinout & Package
The LM4040DEX3-2.1+T is housed in a RoHS-compliant 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is internally unconnected and must be left floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Cathode Input | Positive terminal of shunt reference; connects to supply rail via series resistor (RS) |
| 2 (–) | Cathode / Reference Output | Negative terminal; provides stable 2.048V reference node relative to this pin |
| 3 (N.C.) | No Connection | Internally unconnected; must remain unconnected or shorted to pin 2 - not used for signal or thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% board space vs. SOT23, critical for portable and automotive modules |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout complexity |
| Extended temperature range | –40°C to +125°C operation supports under-hood automotive and industrial process control environments |
| Low micropower consumption | 60μA minimum shunt current enables battery-powered sensor nodes with multi-year runtime |
| AEC-Q100 qualified option | LM4040DEX3-2.1+T meets stress test requirements for automotive electronics (per /V variants) |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Temperature Sensor Calibration |
|---|---|
Use Scenario: Providing stable 2.048V reference for 12-bit ADCs measuring exhaust gas oxygen (EGO) sensor output in engine management systems. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise voltage threshold for analog-to-digital conversion. Use Value: Enables <1 LSB error over –40°C to +125°C ambient, meeting ASAM MCD-2 MC functional safety requirements for closed-loop fuel control. | Use Scenario: Biasing platinum RTD bridges in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric measurement of resistance changes in Pt100 sensors. Use Value: Delivers ±0.1°C measurement accuracy over full industrial temperature range due to low tempco and long-term stability. |
| Portable Medical Glucose Monitor | Smart Energy Meter Reference |
Use Scenario: Supplying reference voltage to low-power op-amps amplifying electrochemical current from disposable glucose test strips. IC Role / Device Role / Timing Role: Micropower shunt reference maintaining accuracy during intermittent battery-powered operation. Use Value: 60μA minimum current allows operation from coin-cell batteries for >2 years, while 28μVRMS noise ensures <0.5% glucose concentration error. | Use Scenario: Serving as primary reference for metrology-grade 24-bit sigma-delta ADCs measuring AC mains voltage and current in Class 0.2 smart meters. IC Role / Device Role / Timing Role: High-stability shunt reference enabling accurate energy billing under varying grid conditions. Use Value: 120ppm long-term drift ensures <0.01% calibration drift over 10-year field life, satisfying IEC 62053-21 accuracy class compliance. |
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 output; 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 package | Requires external resistors for 2.048V setting; higher quiescent current (80μA min); lower noise (20μVRMS) | Select when adjustable output or tighter tempco is needed; verify layout compatibility with SOT23 footprint |
| MAX6008AEUR+T | Fixed 2.048V; 0.2% initial accuracy; 50ppm/°C tempco; SOT23-3 package; 1.8V–18V supply range | Series reference (not shunt); requires minimum 2.5V supply; higher cost; better long-term stability (50ppm/1kHr) | Select when highest accuracy and lowest drift are prioritized over micropower or shunt topology constraints |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040DEX3-2.1+T offers the smallest footprint and lowest minimum operating current, making it optimal for ultra-compact, battery-sensitive designs where ±1% accuracy is acceptable - but trades off against tighter tempco and absolute drift performance.
Availability
LM4040DEX3-2.1+T is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor calibration, portable medical instrumentation, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040DEX3-2.1+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, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, wide-temperature, and high-reliability systems - especially where simplicity, low cost, and zero external components are critical.
FAQ
What is the exact output voltage tolerance of LM4040DEX3-2.1+T at +25°C?
The LM4040DEX3-2.1+T has a nominal reverse breakdown voltage of 2.048V with ±20mV (±1.0%) tolerance at +25°C, as specified in the D-grade electrical characteristics table. This tolerance expands to ±41mV over the full –40°C to +125°C range due to its ±150ppm/°C temperature coefficient.
Can LM4040DEX3-2.1+T operate without an external capacitor?
Yes, the LM4040DEX3-2.1+T is inherently stable and does not require an external output capacitor. It remains stable with any capacitive load, including direct connection to ADC reference inputs or op-amp feedback networks - eliminating BOM cost and layout risk associated with capacitor selection.
What is the minimum shunt current required for regulation in LM4040DEX3-2.1+T?
The LM4040DEX3-2.1+T requires a minimum shunt current of 45μA to maintain regulation, though the datasheet specifies 60μA as the guaranteed operational lower limit across temperature. Below 45μA, the output voltage deviates significantly from 2.048V, risking ADC reference errors or comparator mis-triggering.
Is LM4040DEX3-2.1+T qualified for automotive applications?
The LM4040DEX3-2.1+T itself is not explicitly AEC-Q100 qualified; however, the LM4040 family includes /V suffix variants (e.g., LM4040DEX3-2.1/V+T) that are AEC-Q100 qualified. For automotive use, confirm qualification status via the specific part number's ordering information table and consult Maxim's automotive product documentation.
How does the SC70-3 package of LM4040DEX3-2.1+T compare to SOT23-3 in thermal performance?
The SC70-3 package of LM4040DEX3-2.1+T has a junction-to-ambient thermal resistance (θJA) of 340.4°C/W on a four-layer board, slightly higher than the SOT23-3 variant's 336°C/W. This results in ~1.3°C higher junction temperature rise at 15mA, but both packages remain within safe limits up to +125°C ambient when power dissipation stays below 75mW.
LM4040DEX3-2.1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for LM4040DEX3-2.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-2.1+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 LM4040DEX3-2.1+T reliable?
The price and inventory of LM4040DEX3-2.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEX3-2.1+T is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-2.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-2.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-2.1+T?
LM4040DEX3-2.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-2.1+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 LM4040DEX3-2.1+T?
For technical support, including LM4040DEX3-2.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-2.1+T requirements.
6.How does Aetrix verify that LM4040DEX3-2.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-2.1+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 LM4040DEX3-2.1+T meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-2.1+T?
All LM4040DEX3-2.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-2.1+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 LM4040DEX3-2.1+T part is unused and in its original packaging.
Return procedure for LM4040DEX3-2.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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