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Analog Devices Inc./Maxim Integrated LM4040DEX3-2.5+T
- Part No.:
- LM4040DEX3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-2.5+T.pdf
- Description:
- IC VREF SHUNT 2.5V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
LM4040DEX3-2.5+T from Maxim Integrated is a precision 2.500V fixed-output shunt voltage reference in SC70-3 package, featuring ±1.0% initial accuracy, ±150ppm/°C temperature coefficient over –40°C to +125°C, 60μA–15mA operating current range, and 28μVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in battery-powered analog signal chains and low-power ADC/DAC biasing.
For engineers reviewing the LM4040DEX3-2.5+T datasheet, LM4040DEX3-2.5+T pinout, LM4040DEX3-2.5+T application, or LM4040DEX3-2.5+T equivalent, key selection criteria include guaranteed operation across automotive-grade temperature range, no external capacitor requirement, tolerance of capacitive loads, and compatibility with space-constrained PCB layouts using the 1.8mm × 1.8mm SC70 footprint.
Technical Context
The LM4040DEX3-2.5+T implements a bandgap-based shunt reference architecture, maintaining a precise 2.500V reverse breakdown voltage across its cathode-anode terminals when biased with 60μA to 15mA shunt current. Its internal laser-trimmed resistor network ensures factory-set accuracy without external calibration.
It operates without output capacitance stabilization and remains stable under any capacitive load condition. Thermal performance is characterized by a maximum junction temperature of +150°C and guaranteed functionality over –40°C to +125°C ambient, with dynamic impedance ≤1.1Ω at 1mA and long-term stability of 120ppm after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V nominal; min/max = 2.475V/2.525V at +25°C - defines reference level for ADCs, DACs, and comparators |
| Initial Accuracy | ±1.0% (D-grade) - supports cost-sensitive industrial sensing where <1% absolute error is acceptable |
| Temp Coefficient | ±150ppm/°C max - contributes ≤±18.75mV drift over full –40°C to +125°C range |
| Operating Current | 60μA to 15mA - enables ultra-low-power standby modes and high-current regulation in active circuits |
| Dynamic Impedance | ≤1.1Ω at 1mA - minimizes output voltage shift under transient load changes |
| Wideband Noise | 28μVRMS (10Hz–10kHz) - suitable for 12-bit precision systems without additional filtering |
| Long-Term Stability | 120ppm after 1000h - predicts <0.012% output drift over first year of continuous operation |
Pinout & Package
LM4040DEX3-2.5+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is unconnected (N.C.) and must remain floating or tied to pin 2 per datasheet instruction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated node; sinks shunt current to maintain 2.500V |
| 2 (–) | Anode | Reference ground return path; forms voltage drop with pin 1 to define VREF |
| 3 (N.C.) | No Connection | Must be left unconnected or shorted to pin 2; not internally bonded - prevents parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - reduces PCB real estate by 50% vs. SOT23, critical for wearables and compact modules |
| No output capacitor required | Stable with any capacitive load - eliminates BOM item and layout constraints for decoupling |
| Automotive-grade temp range | –40°C to +125°C operation - qualified for engine control units, ADAS sensors, and infotainment power rails |
| Low micropower startup | 60μA minimum operating current - enables use in always-on battery monitoring circuits with multi-year runtime |
| High-shunt-current capability | 15mA max shunt current - supports direct regulation of small LDOs or op-amp bias networks without external pass devices |
Applications
| Portable Medical Sensors | Notebook Computer Power Management |
|---|---|
Use Scenario: Reference for 12-bit analog front-end in handheld glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.500V for ADC conversion and sensor excitation. Use Value: ±1.0% initial accuracy and 28μVRMS noise ensure <0.5% total measurement error without calibration. | Use Scenario: Precision reference for system voltage supervisor ICs and battery fuel gauges. IC Role / Device Role / Timing Role: Stable 2.500V threshold source for reset generators and coulomb counters. Use Value: Guaranteed operation from –40°C to +125°C allows placement near CPU VRMs without thermal derating. |
| Industrial Process Transmitters | Automotive Cabin Control Modules |
Use Scenario: Reference for 4–20mA loop-powered temperature/pressure transmitters. IC Role / Device Role / Timing Role: Two-terminal shunt reference enabling passive loop power harvesting and signal conditioning. Use Value: 60μA–15mA operating range accommodates wide supply voltage variation (9–36V) while maintaining regulation. | Use Scenario: Reference for HVAC actuator position feedback and ambient light sensor ADCs. IC Role / Device Role / Timing Role: AEC-Q100-compliant shunt reference supplying stable bias to automotive-grade analog interfaces. Use Value: ±150ppm/°C tempco ensures <±20mV drift over cabin temperature extremes (–40°C to +85°C). |
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 (2.5V–36V) 3-terminal shunt; 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 | Requires external resistors to set 2.5V; higher accuracy but larger footprint and design overhead | Choose when adjustable output or tighter accuracy justifies added components and layout area |
| MAX6008AEUR+T | Fixed 2.5V shunt; 0.2% initial accuracy; 50ppm/°C tempco; SC70-3; 10μA–20mA range | Higher precision and lower noise (12μVRMS), but limited to 20mA max current and narrower temp range (–40°C to +85°C) | Choose when sub-0.5% accuracy and ultra-low noise are mandatory, and ambient stays below +85°C |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040DEX3-2.5+T offers the lowest-cost, smallest-footprint solution for applications accepting ±1% accuracy and requiring full automotive temperature support - no external components, no layout penalty, and guaranteed robustness in harsh environments.
Availability
LM4040DEX3-2.5+T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power management, industrial process transmitters, and automotive cabin control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040DEX3-2.5+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 industrial, communications, computing, and consumer applications.
The LM4040 product line delivers precision micropower shunt references optimized for space-constrained, battery-operated, and automotive-grade systems requiring stable voltage references without external compensation.
FAQ
What is the guaranteed operating temperature range for LM4040DEX3-2.5+T?
The LM4040DEX3-2.5+T is specified for continuous operation from –40°C to +125°C ambient temperature. This extended range is confirmed in the Ordering Information table and Absolute Maximum Ratings section, making it suitable for under-hood automotive and industrial environments where thermal stress exceeds commercial-grade limits.
Does LM4040DEX3-2.5+T require an external output capacitor for stability?
No, LM4040DEX3-2.5+T does not require an external output capacitor. The device is internally compensated and remains stable with any capacitive load, including direct connection to large bypass caps or ADC input filters. This eliminates a BOM item and simplifies layout - a key advantage over many competing shunt references.
What is the minimum shunt current needed for LM4040DEX3-2.5+T to regulate properly?
The LM4040DEX3-2.5+T requires a minimum shunt current of 60μA to maintain regulation within specification. This value is explicitly listed in the Electrical Characteristics table for the D-grade 2.500V version and applies across the full –40°C to +125°C temperature range.
How does the pin configuration of LM4040DEX3-2.5+T differ from standard 3-pin voltage references?
LM4040DEX3-2.5+T uses a two-active-terminal configuration: pin 1 is cathode (+), pin 2 is anode (–), and pin 3 is N.C. (no connection). Unlike three-terminal references, pin 3 must remain unconnected or tied to pin 2 - it is not internally bonded and serves only as a mechanical placeholder in the SC70-3 package.
What is the long-term stability specification for LM4040DEX3-2.5+T?
The LM4040DEX3-2.5+T exhibits 120ppm reverse breakdown voltage drift after 1000 hours of operation at elevated temperature. This figure is measured and guaranteed per the Electrical Characteristics table and reflects typical aging behavior for the D-grade device under accelerated life testing conditions.
LM4040DEX3-2.5+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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- 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
LM4040DEX3-2.5+T FAQ
1.How can I place an order for LM4040DEX3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-2.5+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 LM4040DEX3-2.5+T reliable?
The price and inventory of LM4040DEX3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEX3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-2.5+T?
LM4040DEX3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-2.5+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 LM4040DEX3-2.5+T?
For technical support, including LM4040DEX3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-2.5+T requirements.
6.How does Aetrix verify that LM4040DEX3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-2.5+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 LM4040DEX3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-2.5+T?
All LM4040DEX3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-2.5+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 LM4040DEX3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040DEX3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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