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Analog Devices Inc./Maxim Integrated LM4040DEX3-3.0+T
- Part No.:
- LM4040DEX3-3.0+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-3.0+T.pdf
- Description:
- IC VREF SHUNT 1% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,127
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Product details
Overview
LM4040DEX3-3.0+T from Maxim Integrated is a precision 3.000V 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 to 15mA shunt current capability and low 1.1Ω dynamic impedance, ideal for high-reliability analog sensing and power monitoring in automotive ECUs.
For engineers reviewing the LM4040DEX3-3.0+T datasheet, LM4040DEX3-3.0+T pinout, LM4040DEX3-3.0+T application, or LM4040DEX3-3.0+T equivalent, key selection criteria include its extended temperature range, no-output-capacitor stability, 3-pin SC70 footprint, and AEC-Q100 qualification for automotive use cases requiring long-term voltage reference integrity under thermal stress.
Technical Context
The LM4040DEX3-3.0+T uses bandgap-based shunt regulation to maintain a fixed 3.000V reverse breakdown voltage across its terminals when biased with 60μA–15mA cathode-to-anode current. Its internal laser-trimmed resistor network ensures 1.0% initial accuracy at +25°C, while its ±150ppm/°C tempco defines worst-case drift over -40°C to +125°C.
No external capacitor is required for stability, and it tolerates any capacitive load without oscillation. The device exhibits 50µVRMS wideband noise (10Hz–10kHz) and maintains ≤10.0mV reverse voltage change across full operating current range, enabling precision ADC reference and sensor excitation in space-constrained industrial modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V nominal reverse breakdown voltage, with ±30mV tolerance at +25°C (1.0% grade) |
| Initial Accuracy | ±1.0% at +25°C, corresponding to ±30mV absolute error on 3.000V output |
| Tempco | ±150ppm/°C max, resulting in ±45mV drift over full -40°C to +125°C range |
| Operating Current | 60μA minimum to 15mA maximum shunt current; stable regulation across this range |
| Dynamic Impedance | 1.1Ω max at 1mA, ensuring minimal voltage shift under load transients |
| Wideband Noise | 50µVRMS (10Hz–10kHz), suitable for 12-bit ADC reference applications |
| Temperature Range | -40°C to +125°C operational, qualified per AEC-Q100 for automotive environments |
Pinout & Package
LM4040DEX3-3.0+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 unconnected (N.C.) and must be left floating or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Positive terminal (cathode) | Reverse-biased input; connects to higher-potential node in shunt configuration |
| 2 (–) | Negative terminal (anode) | Reference ground return; sinks shunt current to system ground |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; no internal function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in ultra-dense PCB layouts like automotive ADAS modules |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk of external C |
| AEC-Q100 qualified | Validated for automotive-grade reliability including temperature cycling and HTOL stress |
| Low 50µVRMS noise | Enables direct use as reference for 12-bit SAR ADCs without additional filtering |
| 15mA max shunt current | Supports high-precision current-sensing circuits with wide dynamic range |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Temperature Sensor Interface |
|---|---|
Use Scenario: Providing stable 3.000V reference for analog front-end of oxygen sensor signal conditioning circuitry in engine management systems. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise bias point for ratiometric measurement of Nernst cell output. Use Value: Maintains <±45mV output drift over -40°C to +125°C ambient, ensuring consistent air-fuel ratio calculation accuracy across vehicle operating conditions. | Use Scenario: Supplying excitation voltage and reference for 4-wire RTD measurement bridges in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision shunt reference generating known voltage for bridge excitation and ADC reference simultaneously. Use Value: 1.1Ω dynamic impedance minimizes voltage droop during bridge current transients, preserving measurement linearity under varying load conditions. |
| Portable Medical Pulse Oximeter | Battery-Powered IoT Environmental Monitor |
Use Scenario: Acting as reference for photodiode transimpedance amplifier and ADC in compact wearable pulse oximeters. IC Role / Device Role / Timing Role: Low-noise (50µVRMS) shunt reference enabling accurate DC/AC photoplethysmogram signal digitization. Use Value: Ultra-low 60μA minimum operating current extends battery life in coin-cell-powered devices while maintaining reference stability. | Use Scenario: Delivering stable reference for gas sensor analog output scaling and microcontroller ADC in wireless environmental nodes. IC Role / Device Role / Timing Role: Micropower shunt reference supporting intermittent wake-up operation with fast startup (<90µs typical). Use Value: SC70-3 package allows integration into sub-10mm² sensor node PCBs without sacrificing voltage accuracy or thermal robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C30IDBZR | 3.0V output, 0.5% initial accuracy, ±50ppm/°C tempco, SOT23-3 package | Higher accuracy and lower tempco, but rated only to +105°C (not AEC-Q100) | Select for non-automotive industrial applications where tighter tolerance and lower drift outweigh extended temperature need |
| MAX6003EUR+T | 3.0V output, 1.0% accuracy, ±100ppm/°C tempco, SOT23-3, 100µA min current | Same accuracy grade but lower tempco and higher minimum current; not AEC-Q100 qualified | Choose when board-level thermal margin allows relaxed tempco and SC70 size is not mandatory |
Compared with TL4050C30IDBZR and MAX6003EUR+T, LM4040DEX3-3.0+T uniquely combines AEC-Q100 qualification, SC70-3 footprint, and -40°C to +125°C operation-making it the only option among the three validated for under-hood automotive deployment without derating.
Availability
LM4040DEX3-3.0+T is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface modules, portable medical instrumentation, and battery-powered IoT edge nodes requiring stable component supply across extended temperature ranges.
Supply support for LM4040DEX3-3.0+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 designs high-performance analog and mixed-signal semiconductor solutions for automotive, industrial, communications, and consumer markets.
The LM4040 product line delivers micropower, precision shunt voltage references optimized for space-constrained, thermally demanding applications where stability, low noise, and long-term reliability are critical.
FAQ
What is the guaranteed operating temperature range for LM4040DEX3-3.0+T?
The LM4040DEX3-3.0+T is specified and guaranteed over -40°C to +125°C ambient temperature. This extended range is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, and the device is AEC-Q100 qualified for automotive use. Operation outside this range may result in parametric degradation or permanent damage.
Does LM4040DEX3-3.0+T require an external output capacitor for stability?
No, LM4040DEX3-3.0+T does not require an external output capacitor. The device is internally compensated and remains stable with any capacitive load, including zero capacitance. This eliminates BOM cost and layout complexity while ensuring reliable performance across all PCB parasitics and sensor cable capacitances encountered in real-world applications.
What is the meaning of "D" and "E" in the part number LM4040DEX3-3.0+T?
In LM4040DEX3-3.0+T, "D" denotes the 1.0% initial accuracy grade, and "E" indicates the extended -40°C to +125°C temperature range. "X3" specifies the SC70-3 package, "3.0" is the nominal 3.000V output voltage, and "+T" confirms RoHS-compliant, tape-and-reel packaging. These codes are defined in Maxim's official Ordering Information table.
Can LM4040DEX3-3.0+T be used in forward conduction mode?
Yes, LM4040DEX3-3.0+T can conduct up to 10mA in forward direction (anode to cathode), behaving like a standard silicon diode. However, its primary design purpose and guaranteed specifications apply only in reverse-biased (shunt reference) operation. Forward conduction should be avoided in precision reference applications, as it introduces uncontrolled voltage drop and thermal effects.
What is the maximum shunt current rating for LM4040DEX3-3.0+T before damage occurs?
The absolute maximum reverse current for LM4040DEX3-3.0+T is 20mA, as stated in the Absolute Maximum Ratings. Continuous operation above 15mA is not recommended, as it exceeds the specified operating range and risks exceeding the 235mW power dissipation limit of the SC70-3 package at elevated temperatures. Sustained 20mA could cause junction overheating beyond +150°C, leading to irreversible degradation.
LM4040DEX3-3.0+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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 45µVrms
- 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
LM4040DEX3-3.0+T FAQ
1.How can I place an order for LM4040DEX3-3.0+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-3.0+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 LM4040DEX3-3.0+T reliable?
The price and inventory of LM4040DEX3-3.0+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEX3-3.0+T is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-3.0+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-3.0+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-3.0+T?
LM4040DEX3-3.0+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-3.0+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 LM4040DEX3-3.0+T?
For technical support, including LM4040DEX3-3.0+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-3.0+T requirements.
6.How does Aetrix verify that LM4040DEX3-3.0+T is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-3.0+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 LM4040DEX3-3.0+T meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-3.0+T?
All LM4040DEX3-3.0+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-3.0+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 LM4040DEX3-3.0+T part is unused and in its original packaging.
Return procedure for LM4040DEX3-3.0+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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