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Analog Devices Inc./Maxim Integrated LM4040DEX3-4.1
- Part No.:
- LM4040DEX3-4.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-4.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,013
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Product details
Overview
LM4040DEX3-4.1 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, and guaranteed operation from -40°C to +125°C. It delivers stable reverse breakdown voltage with 50µA to 15mA shunt current capability, low 1.3Ω dynamic impedance, and 64µVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4040DEX3-4.1 datasheet, LM4040DEX3-4.1 pinout, LM4040DEX3-4.1 application, or LM4040DEX3-4.1 equivalent, key selection criteria include its fixed 4.096V output, SC70-3 footprint compatibility, extended temperature range, shunt current regulation behavior, and absence of required output capacitance.
Technical Context
The LM4040DEX3-4.1 uses bandgap-based shunt architecture to maintain a precise 4.096V reverse breakdown voltage across its cathode-anode terminals. Its laser-trimmed internal resistor network ensures 1.0% initial tolerance, while the ±150ppm/°C tempco reflects worst-case drift over -40°C to +125°C.
It operates as a two-terminal device requiring only an external series resistor to set shunt current between 50µA and 15mA. No external capacitor is needed for stability, and it tolerates arbitrary capacitive loads without oscillation-enabling direct integration into space-constrained analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal at +25°C; ±41mV (±1.0%) initial tolerance over full temperature range |
| Temperature Coefficient | ±150ppm/°C max; contributes ≤±65mV drift over -40°C to +125°C |
| Shunt Current Range | 50µA to 15mA; enables low-power sensor biasing and high-current reference buffering |
| Dynamic Impedance | 0.5Ω to 1.3Ω at 1mA/120Hz; ensures <10mV output shift under 10mA load transients |
| Wideband Noise | 64µVRMS (10Hz–10kHz); suitable for 12-bit to 14-bit data converter references |
| Operating Temperature | -40°C to +125°C; qualified for industrial and automotive under-hood environments |
| Long-Term Stability | 120ppm after 1000 hours; supports calibration-critical metrology applications |
Pinout & Package
LM4040DEX3-4.1 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is no-connect (N.C.) and must remain unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to higher-voltage supply rail via series resistor |
| 2 (–) | Anode | Reference ground node; common return path for shunt and load currents |
| 3 (N.C.) | No Connection | Must be left floating or shorted to pin 2; no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves PCB real estate in portable and wearable designs |
| No output capacitor required | Eliminates BOM cost and layout complexity while maintaining stability with any capacitive load |
| Extended temperature range | -40°C to +125°C operation supports industrial control and automotive subsystems |
| Low dynamic impedance | ≤1.3Ω minimizes output voltage variation during fast load current changes |
| High shunt current capability | 15mA max allows driving multiple downstream circuits without external buffers |
Applications
| Portable Instrumentation | Industrial Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter using 12-bit SAR ADC with ratiometric measurement. IC Role / Device Role / Timing Role: Provides stable 4.096V reference for ADC VREF input, enabling precise voltage measurements independent of supply fluctuations. Use Value: 1.0% initial accuracy and ±150ppm/°C tempco ensure <0.5% total error over operating temperature, meeting Class II meter specifications. | Use Scenario: 4–20mA loop-powered transmitter with onboard microcontroller and analog sensor interface. IC Role / Device Role / Timing Role: Supplies regulated 4.096V bias to pressure/temperature sensor signal conditioning circuitry and ADC reference. Use Value: SC70-3 size fits tight board space; 50µA minimum operating current enables ultra-low quiescent power design. |
| Automotive Body Control Module | Medical Point-of-Care Sensor |
Use Scenario: Cabin temperature sensor node in BCM requiring reliable reference under battery voltage variation (9–16V). IC Role / Device Role / Timing Role: Shunt reference generating stable 4.096V from unregulated 12V rail via series resistor, powering op-amp and ADC stages. Use Value: -40°C to +125°C rating matches under-dash thermal environment; no capacitor simplifies AEC-Q200-compliant layout. | Use Scenario: Portable blood glucose meter with electrochemical sensor and low-power MCU. IC Role / Device Role / Timing Role: Precision reference for sensor excitation and ADC conversion in battery-operated diagnostic device. Use Value: 64µVRMS noise supports accurate 14-bit resolution; 50µA min current extends battery life in sleep mode. |
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 | 4.096V, 0.5% initial accuracy, ±50ppm/°C tempco, SOT23-3 package | Higher accuracy and lower tempco, but larger SOT23 footprint and narrower -40°C to +105°C range | Select when tighter long-term stability and lower drift are prioritized over board space and extended temperature operation |
| ADR3440ARJZ-R7 | 4.096V, 0.1% initial accuracy, ±10ppm/°C tempco, SOT23-5 package with enable pin | Higher precision, lower noise (3.5µVRMS), but requires 5-pin layout and active enable control | Select for high-end instrumentation where ultra-low drift and noise outweigh footprint and control complexity |
Compared with TL4050C41IDBZR and ADR3440ARJZ-R7, the LM4040DEX3-4.1 trades initial accuracy and tempco for compact SC70-3 size and extended +125°C operation-making it optimal for space-constrained industrial and automotive modules where moderate precision suffices.
Availability
LM4040DEX3-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and automotive body control modules requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040DEX3-4.1 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 power management, sensing, and communication applications.
The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, battery-powered, and high-reliability systems demanding stable reference performance across wide temperature ranges.
FAQ
What is the exact output voltage tolerance of LM4040DEX3-4.1 at room temperature?
The LM4040DEX3-4.1 has a nominal reverse breakdown voltage of 4.096V at +25°C, with a guaranteed initial tolerance of ±41mV (±1.0%). This is confirmed in the Electrical Characteristics table for the D-grade 4.096V variant under TA = +25°C conditions, where VR min = 4.055V and max = 4.137V.
Does LM4040DEX3-4.1 require an external output capacitor for stability?
No, the LM4040DEX3-4.1 does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including zero capacitance. This is explicitly stated in the General Description and Applications Information sections, eliminating layout constraints and BOM cost associated with reference decoupling.
What is the minimum operating current for LM4040DEX3-4.1, and why does it matter?
The LM4040DEX3-4.1 requires a minimum shunt current of 50µA to maintain regulation. Below this threshold, output voltage deviates significantly from 4.096V. This value is critical for designing the series resistor in low-power applications-ensuring sufficient current flows even at lowest supply voltage and highest load current.
Can LM4040DEX3-4.1 be used in automotive under-hood applications?
Yes, the LM4040DEX3-4.1 is rated for -40°C to +125°C operation and packaged in RoHS-compliant SC70-3. Its guaranteed performance across this extended temperature range, combined with no required output capacitor, makes it suitable for non-safety-critical automotive body control and sensor modules located near the engine compartment.
How does the pin configuration of LM4040DEX3-4.1 differ from standard three-terminal references?
Unlike typical three-terminal references, the LM4040DEX3-4.1 is a two-terminal shunt device: 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-no internal functionality exists on pin 3, distinguishing it from series-mode references with separate input/output/ground pins.
LM4040DEX3-4.1 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):
- 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 FAQ
1.How can I place an order for LM4040DEX3-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-4.1 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 LM4040DEX3-4.1 reliable?
The price and inventory of LM4040DEX3-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEX3-4.1 is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-4.1?
LM4040DEX3-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-4.1 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 LM4040DEX3-4.1?
For technical support, including LM4040DEX3-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-4.1 requirements.
6.How does Aetrix verify that LM4040DEX3-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-4.1 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 LM4040DEX3-4.1 meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-4.1?
All LM4040DEX3-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-4.1, 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 LM4040DEX3-4.1 part is unused and in its original packaging.
Return procedure for LM4040DEX3-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040DEX3-4.1 Tags
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