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Analog Devices Inc./Maxim Integrated LM4040DEX3-3.0
- Part No.:
- LM4040DEX3-3.0
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-3.0.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,138
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Product details
Overview
LM4040DEX3-3.0 from Maxim Integrated is a precision 3.000V two-terminal shunt voltage reference in SC70-3 package, featuring 1.0% initial accuracy, ±100ppm/°C temperature coefficient (max), 60μA to 15mA operating current range, and guaranteed operation from –40°C to +125°C. It delivers stable reverse-breakdown voltage for analog-to-digital converter references and portable power monitoring circuits.
For engineers reviewing the LM4040DEX3-3.0 datasheet, LM4040DEX3-3.0 pinout, LM4040DEX3-3.0 application, or LM4040DEX3-3.0 equivalent, key selection criteria include shunt current capability, temperature drift over industrial range, SC70 footprint constraints, no-output-capacitor stability, and long-term voltage stability under continuous bias.
Technical Context
The LM4040DEX3-3.0 uses laser-trimmed bandgap circuitry to maintain a precise 3.000V reverse breakdown voltage across its cathode-anode terminals. Its two-terminal architecture eliminates need for external feedback or reference resistors, simplifying design in space-constrained systems.
It operates as a passive shunt regulator: when reverse-biased with current between 60μA and 15mA, it clamps voltage at 3.000V ±30mV (D-grade tolerance at +25°C) while maintaining low dynamic impedance (≤1.1Ω at 1mA). No output capacitor is required for stability, even with capacitive loads up to 1µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V nominal; ±30mV max tolerance at +25°C ensures ADC reference accuracy within 0.1% full-scale error for 12-bit converters |
| Initial Accuracy | ±1.0% (D-grade); guarantees worst-case deviation of ±30mV at room temperature without calibration |
| Temp Coefficient | ±100ppm/°C max; contributes ≤±12mV drift over –40°C to +125°C, critical for unheated industrial sensor nodes |
| Operating Current | 60μA to 15mA; supports ultra-low-power sleep modes and high-current regulation without external components |
| Dynamic Impedance | ≤1.1Ω at 1mA; minimizes load-induced voltage sag during transient current steps in precision measurement paths |
| Wideband Noise | 45µVRMS (10Hz–10kHz); enables use in high-resolution SAR ADC reference paths without added filtering |
| Long-Term Stability | 120ppm over 1000h; ensures <0.04% reference drift over 1 year in deployed instrumentation |
Pinout & Package
LM4040DEX3-3.0 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is NC and must be left unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to higher-potential node (e.g., supply rail or source resistor) |
| 2 (–) | Anode | Reference ground terminal; forms voltage reference point for downstream circuitry |
| 3 (N.C.) | No Connection | Must remain floating or shorted to pin 2; no internal connection-violating this risks parametric shift |
Key Features
| Feature | Design Value |
|---|---|
| SC70-3 package | 1.8mm × 1.8mm footprint enables placement in ultra-dense PCB layouts such as wearable medical sensors |
| No output capacitor required | Eliminates BOM cost and board area for stability components while tolerating any capacitive load |
| 15mA max shunt current | Supports direct regulation of 10-bit DACs or microcontroller VREF inputs without series pass devices |
| –40°C to +125°C operation | Validated for under-hood automotive modules and industrial PLC I/O conditioning circuits |
| 28–45µVRMS noise | Meets SNR requirements for 16-bit delta-sigma ADCs without additional low-noise filtering stages |
Applications
| Portable Battery Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Real-time battery voltage tracking in lithium-ion powered handheld test equipment. IC Role / Device Role / Timing Role: Shunt reference providing stable 3.000V reference for 12-bit ADC measuring cell voltage. Use Value: Enables ±10mV absolute voltage accuracy over full temperature range without calibration, extending device runtime via precise low-battery detection. | Use Scenario: Precision bridge sensor excitation and signal amplification in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Reference voltage source for instrumentation amplifier gain-setting and ADC conversion. Use Value: Maintains <0.05% full-scale error over –40°C to +125°C, eliminating thermal zero-drift compensation firmware. |
| Automotive Cabin Control Unit | Medical Infusion Pump Power Management |
Use Scenario: Supply rail monitoring in HVAC control modules exposed to under-dash thermal cycling. IC Role / Device Role / Timing Role: Voltage reference for supervisor IC detecting undervoltage lockout thresholds. Use Value: AEC-Q100 qualified variant available; D-grade 3.000V output ensures reliable reset assertion across automotive temperature extremes. | Use Scenario: Low-power microcontroller VREF input in battery-operated infusion pumps requiring FDA-grade accuracy. IC Role / Device Role / Timing Role: Micropower shunt reference supplying stable 3.000V to 10-bit DAC controlling motor current. Use Value: 60μA minimum operating current enables >5-year battery life in standby mode while preserving 0.1% reference fidelity. |
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, 0.5% initial accuracy, ±50ppm/°C tempco, SOT23-3 package | Better accuracy and lower drift, but larger SOT23 footprint and requires ≥70μA min current | Select for higher-precision systems where board area allows SOT23 and tighter voltage tolerance is mandatory |
| ADR3430ARJZ-R7 | 3.0V, 0.1% initial accuracy, ±10ppm/°C tempco, SC70-5 package with enable pin | Lower noise (12µVRMS), tighter specs, but 5-pin SC70 and active-enable architecture add complexity | Select when ultra-low drift and shutdown capability justify extra pin count and layout redesign |
Compared with TL4050C30IDBZR and ADR3430ARJZ-R7, LM4040DEX3-3.0 offers the smallest footprint and lowest quiescent current among 3.0V shunt references, making it optimal for size- and power-constrained designs where ±1% accuracy is acceptable.
Availability
LM4040DEX3-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and automotive cabin electronics requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040DEX3-3.0 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 industrial systems where minimal external components and wide temperature operation are essential.
FAQ
What is the maximum junction temperature rating for LM4040DEX3-3.0?
The LM4040DEX3-3.0 has a maximum junction temperature of +150°C. Its SC70-3 package features a thermal resistance of approximately 460°C/W, so proper PCB copper pour and ambient derating must be applied when operating near 15mA shunt current at high ambient temperatures. The device is rated for continuous operation up to +125°C ambient.
Does LM4040DEX3-3.0 require an external capacitor for stability?
No, LM4040DEX3-3.0 does not require an external capacitor for stability. It is designed to remain stable with any capacitive load, including 0pF to 1µF, eliminating the need for output bypass capacitors in most applications. This simplifies layout and reduces BOM count compared to series references.
What is the minimum operating current for LM4040DEX3-3.0 at –40°C?
The LM4040DEX3-3.0 specifies a minimum operating current of 67μA at –40°C (per Electrical Characteristics table for 3.000V D-grade). Below this current, the device may not regulate at its nominal 3.000V, risking reference inaccuracy in cold-start scenarios for battery-powered systems.
How does the 1.0% initial accuracy of LM4040DEX3-3.0 translate to absolute voltage tolerance at +25°C?
At +25°C, the 1.0% initial accuracy of LM4040DEX3-3.0 corresponds to ±30mV tolerance around the nominal 3.000V output, meaning the measured reverse breakdown voltage will fall between 2.970V and 3.030V. This is confirmed in the datasheet's "Electrical Characteristics-3.000V" table under LM4040D grade.
Can LM4040DEX3-3.0 be used in AEC-Q100 qualified automotive designs?
While LM4040DEX3-3.0 itself is not AEC-Q100 qualified, the LM4040AEX3-3.0/V+T and LM4040BEX3-3.0/V+T variants are explicitly listed as AEC-Q100 qualified in the datasheet. For automotive applications requiring qualification, those /V+T versions should be selected instead of LM4040DEX3-3.0.
LM4040DEX3-3.0 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):
- 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 FAQ
1.How can I place an order for LM4040DEX3-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-3.0 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 reliable?
The price and inventory of LM4040DEX3-3.0 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 is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-3.0?
LM4040DEX3-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-3.0 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?
For technical support, including LM4040DEX3-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-3.0 requirements.
6.How does Aetrix verify that LM4040DEX3-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-3.0 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 meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-3.0?
All LM4040DEX3-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-3.0, 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 part is unused and in its original packaging.
Return procedure for LM4040DEX3-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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