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Analog Devices Inc./Maxim Integrated LM4040AEX3-3.0
- Part No.:
- LM4040AEX3-3.0
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040AEX3-3.0.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,396
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Product details
Overview
LM4040AEX3-3.0 from Maxim Integrated is a precision 3.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +125°C, 60µA–15mA operating current range, and 45µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in portable battery-powered systems requiring minimal board space and low quiescent current.
For engineers reviewing the LM4040AEX3-3.0 datasheet, LM4040AEX3-3.0 pinout, LM4040AEX3-3.0 application, or LM4040AEX3-3.0 equivalent, key selection criteria include guaranteed extended-temperature operation, no-output-capacitor stability, micropower shunt current capability, and laser-trimmed bandgap architecture for high DC accuracy.
Technical Context
The LM4040AEX3-3.0 implements a bandgap-based shunt reference topology that maintains a fixed 3.000V reverse breakdown voltage across its terminals when biased with 60µA–15mA cathode-to-anode current. Its internal pass transistor sinks variable current to regulate output voltage against supply and load variations.
It operates without external stabilization capacitors and remains stable under any capacitive load condition. The device is specified for full performance across –40°C to +125°C, with guaranteed 0.1% initial tolerance and ±15ppm/°C max temperature coefficient at 100µA test current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V ±3.0mV at +25°C - precise setpoint for ADC references, sensor excitation, and power-supply monitoring |
| Initial Accuracy | 0.1% (±3.0mV) - enables high-resolution measurement without calibration |
| Temp Coefficient | ±15ppm/°C - ensures ≤±1.2mV drift over –40°C to +125°C ambient |
| Operating Current | 60µA to 15mA - supports ultra-low-power sleep modes and high-current regulation |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA - minimizes output voltage shift under dynamic load transients |
| Wideband Noise | 45µVRMS (10Hz–10kHz) - suitable for precision 12-bit+ data acquisition systems |
| Long-Term Stability | 120ppm (1000h) - ensures reference integrity in sealed industrial deployments |
Pinout & Package
LM4040AEX3-3.0 is housed in a 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 |
|---|---|---|
| Pin 1 (+) | Anode / Cathode Input | Positive terminal of shunt reference; connects to regulated supply rail or source resistor |
| Pin 2 (–) | Cathode / Reference Output | Negative terminal; provides stable 3.000V reference potential relative to system ground |
| Pin 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2; no internal function or electrical path |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23 alternatives in portable designs |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout sensitivity |
| Laser-trimmed bandgap core | Enables 0.1% initial accuracy without post-assembly calibration |
| Extended temperature grade | –40°C to +125°C operation supports automotive under-hood and industrial control environments |
| Low 45µVRMS noise | Meets SNR requirements for 12-bit SAR ADCs without additional filtering |
Applications
| Portable Medical Sensors | Battery Management Systems |
|---|---|
Use Scenario: Reference for analog front-end of wearable ECG/SpO₂ sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Provides stable 3.000V excitation and ADC reference voltage under varying battery discharge profiles. Use Value: Enables <1 LSB error in 12-bit conversions across 0.9–3.6V supply range and –20°C to +60°C operating envelope. | Use Scenario: Voltage reference for cell voltage monitoring ICs in lithium-ion pack protection circuits. IC Role / Device Role / Timing Role: Supplies accurate 3.000V threshold for overvoltage/undervoltage detection comparators. Use Value: Ensures ±5mV detection accuracy over full temperature range, preventing false trip events during thermal cycling. |
| Industrial PLC Analog I/O Modules | Automotive Cabin Control Units |
Use Scenario: Reference for 4–20mA transmitter DACs in factory automation signal conditioning boards. IC Role / Device Role / Timing Role: Delivers stable 3.000V reference to precision DACs driving current-loop outputs. Use Value: Maintains <0.05% full-scale linearity over –40°C to +85°C, meeting IEC 61000-6-2 immunity requirements. | Use Scenario: Reference for HVAC actuator position feedback ADCs in climate control modules. IC Role / Device Role / Timing Role: Supplies regulated 3.000V to potentiometer interface circuitry exposed to engine bay thermal gradients. Use Value: Guarantees ≤±1.5mV reference drift from –40°C cold start to +125°C under-hood soak, ensuring closed-loop accuracy. |
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; 100ppm/°C tempco; SOT23-3 | Requires external resistors for 3.0V setting; higher minimum cathode current (80µA) | Choose when design flexibility or higher voltage options are needed; verify layout for resistor placement and thermal coupling |
| ADR3430ARJZ-R7 | Fixed 3.0V; 0.1% accuracy; 10ppm/°C tempco; SOT23-5; series topology (not shunt) | Requires input-to-output headroom; higher quiescent current (120µA); different pinout and biasing | Prefer for low-noise, low-tempco applications where series topology fits supply architecture; not drop-in compatible |
Compared with TLVH431ACDBVR and ADR3430ARJZ-R7, the LM4040AEX3-3.0 offers true shunt operation with zero headroom requirement, smallest footprint, and guaranteed stability without external components-making it optimal for space-constrained, ultra-low-power, fixed-voltage reference use cases.
Availability
LM4040AEX3-3.0 is available at Aetrix Electronics and suitable for portable medical sensors, battery management systems, and industrial PLC analog I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040AEX3-3.0 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, sensing, connectivity, and security applications.
The LM4040 product line delivers precision shunt voltage references optimized for micropower, small-footprint, and extended-temperature applications in portable, industrial, and automotive systems.
FAQ
What is the guaranteed operating temperature range for LM4040AEX3-3.0?
The LM4040AEX3-3.0 is rated for continuous operation from –40°C to +125°C. This extended temperature grade is confirmed in the Ordering Information table (page 13) and Absolute Maximum Ratings section, making it suitable for under-hood automotive and industrial control environments where ambient temperatures exceed standard commercial limits.
Does LM4040AEX3-3.0 require an external output capacitor for stability?
No, the LM4040AEX3-3.0 does not require an external output capacitor. As stated in the General Description and Applications Information sections, it is stable with any capacitive load-including zero capacitance-and no external capacitor is needed for frequency stability or transient response.
What is the minimum shunt current required for LM4040AEX3-3.0 to maintain regulation?
The LM4040AEX3-3.0 requires a minimum shunt current of 60µA to maintain regulation, as specified in the Electrical Characteristics table for the 3.000V version (page 4) and confirmed in the Typical Operating Characteristics curves (page 8). Operation below this current may result in loss of reference accuracy.
How does the pin configuration of LM4040AEX3-3.0 differ from standard SOT23 shunt references?
The LM4040AEX3-3.0 uses a 3-pin SC70 package with Pin 1 (+), Pin 2 (–), and Pin 3 (N.C.). Unlike many SOT23 shunt references, Pin 3 has no internal connection and must be left unconnected or tied to Pin 2-this is explicitly called out in the Pin Description (page 12) and Top View diagram (page 1).
What is the wideband noise specification of LM4040AEX3-3.0 and how is it measured?
The LM4040AEX3-3.0 exhibits 45µVRMS wideband noise over 10Hz to 10kHz, as specified in the Electrical Characteristics table for the 3.000V version (page 4). This value is measured at 100µA reverse current and represents total integrated RMS noise, critical for high-resolution data acquisition systems.
LM4040AEX3-3.0 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:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 45µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 67 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040AEX3-3.0 FAQ
1.How can I place an order for LM4040AEX3-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEX3-3.0 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 LM4040AEX3-3.0 reliable?
The price and inventory of LM4040AEX3-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEX3-3.0 is usually 5 days.
3.What payment methods are accepted for LM4040AEX3-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEX3-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEX3-3.0?
LM4040AEX3-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEX3-3.0 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 LM4040AEX3-3.0?
For technical support, including LM4040AEX3-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEX3-3.0 requirements.
6.How does Aetrix verify that LM4040AEX3-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4040AEX3-3.0 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 LM4040AEX3-3.0 meets industry standards.
7.What is the process for return or replacement of LM4040AEX3-3.0?
All LM4040AEX3-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEX3-3.0, 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 LM4040AEX3-3.0 part is unused and in its original packaging.
Return procedure for LM4040AEX3-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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