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Analog Devices Inc./Maxim Integrated LM4040AEX3-2.5+T
- Part No.:
- LM4040AEX3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040AEX3-2.5+T.pdf
- Description:
- IC VREF SHUNT 2.5V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:1,913
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Product details
Overview
LM4040AEX3-2.5+T from Maxim Integrated is a precision 2.500V, two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±100ppm/°C temperature coefficient over –40°C to +125°C, and 60μA–15mA operating current range. It delivers stable reverse-breakdown voltage for analog-to-digital converter (ADC) reference, battery-monitoring circuits, and portable power management systems.
For engineers reviewing the LM4040AEX3-2.5+T datasheet, LM4040AEX3-2.5+T pinout, LM4040AEX3-2.5+T application, or LM4040AEX3-2.5+T equivalent, key selection criteria include guaranteed A-grade accuracy at extended temperature, ultra-small SC70 footprint, no-output-capacitor operation, and compatibility with capacitive loads in space-constrained industrial and automotive designs.
Technical Context
The LM4040AEX3-2.5+T uses bandgap-based shunt regulation to maintain a precise 2.500V output across its cathode-anode terminals when reverse-biased between 60μA and 15mA. Its laser-trimmed internal resistor network ensures tight initial tolerance without external calibration.
It operates stably without output capacitance and tolerates arbitrary capacitive loading-unlike series references requiring careful compensation. Thermal performance is validated over –40°C to +125°C, with junction temperature limited to +150°C and thermal resistance θJA = 340.4°C/W on four-layer board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±2.5mV (A-grade, TA = +25°C); enables 12-bit ADC reference with ≤0.1% full-scale error |
| Initial Accuracy | ±0.1% (max); eliminates need for system-level trimming in precision sensor front-ends |
| Tempco | ±100ppm/°C (max); contributes ≤±12.5mV drift over –40°C to +125°C ambient |
| Operating Current | 60μA to 15mA; supports micropower sleep modes and high-current regulation in same device |
| Dynamic Impedance | 0.3Ω to 0.8Ω (at 1mA, 120Hz); maintains <1mV output shift under load transients |
| Wideband Noise | 35µVRMS (10Hz–10kHz); suitable for 16-bit SAR ADC reference without external filtering |
| Long-Term Stability | 120ppm (1000h); ensures <0.3mV drift over 1 year in sealed industrial enclosures |
Pinout & Package
LM4040AEX3-2.5+T is housed in a RoHS-compliant, lead-free 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is NC and must remain unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to supply rail via current-setting resistor |
| 2 (–) | Anode | Reference ground node; forms stable 2.500V potential relative to cathode |
| 3 (N.C.) | No Connection | Must be left floating or shorted to pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23; ideal for wearables and compact modules |
| No output capacitor required | Internally compensated for stability with any capacitive load; eliminates BOM cost and layout risk |
| AEC-Q100 qualified (E-grade) | Rated for –40°C to +125°C operation; validated for automotive body electronics and ADAS power rails |
| Low 35µVRMS noise | Enables direct coupling to high-resolution ADCs without external low-noise LDO or RC filter |
| 60μA minimum operating current | Supports ultra-low-power wake-up circuits and energy-harvesting systems with microamp bias budgets |
Applications
| Portable Battery Monitoring | Industrial Sensor Signal Chain |
|---|---|
|
Use Scenario: Real-time cell voltage measurement in lithium-ion battery packs for handheld medical devices. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.500V基准 for 12-bit ADC input scaling. Use Value: Enables ±10mV absolute voltage accuracy over full temperature range without recalibration. |
Use Scenario: Precision current sensing in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Reference source for op-amp-based current-to-voltage conversion and ADC digitization. Use Value: Maintains <0.05% gain error across –40°C to +85°C, meeting IEC 61000-6-2 immunity requirements. |
| Automotive Cabin Control Unit | Medical Infusion Pump Power Management |
|
Use Scenario: Supply rail monitoring for HVAC control MCU in passenger compartment. IC Role / Device Role / Timing Role: Voltage reference for supervisor IC detecting undervoltage lockout thresholds. Use Value: Guarantees reliable reset assertion at 2.4975V min over –40°C to +125°C, per AEC-Q100 Grade 0. |
Use Scenario: Low-power battery voltage supervision during standby mode of infusion pump. IC Role / Device Role / Timing Role: Micropower shunt reference enabling <100μA total system quiescent current. Use Value: Extends battery life by >30% vs. SOT23 alternatives due to SC70's lower thermal mass and leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | 2.5V adjustable shunt reference; 1% initial accuracy; SOT23-3; 600mV dropout headroom required | Requires external resistors for 2.5V setting; less accurate; higher dynamic impedance (0.5Ω typ) | Select when cost sensitivity outweighs accuracy needs and board space allows SOT23 |
| MAX6002AEUR+T | 2.5V series reference; 0.2% accuracy; SC70-5; requires 1.5V headroom; 65μA quiescent current | Higher pin count; needs output capacitor; unsuitable for reverse-bias topologies | Choose only if system architecture mandates series topology or requires enable control |
Compared with TLV431ACDBVR and MAX6002AEUR+T, the LM4040AEX3-2.5+T offers superior accuracy (0.1% vs. 1%/0.2%), true two-terminal simplicity, and guaranteed stability without capacitors-making it optimal for compact, high-precision shunt-regulated supplies where layout area and thermal constraints are critical.
Availability
LM4040AEX3-2.5+T is available at Aetrix Electronics and suitable for portable battery monitoring, industrial sensor signal chains, automotive cabin control units, and medical infusion pump power management requiring stable component supply across extended temperature ranges.
Supply support for LM4040AEX3-2.5+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 precision analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and computing markets, with emphasis on high-reliability, low-power, and miniaturized components.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, wide-temperature applications where accuracy, stability, and capacitor-free operation are essential-especially in battery-powered and automotive systems.
FAQ
What is the guaranteed operating temperature range for LM4040AEX3-2.5+T?
The LM4040AEX3-2.5+T is rated for continuous operation from –40°C to +125°C. This E-grade specification is validated per AEC-Q100 stress testing and applies across all electrical parameters in the datasheet, including initial accuracy, tempco, and dynamic impedance. The junction temperature limit remains +150°C, with thermal derating applied above +70°C ambient.
Can LM4040AEX3-2.5+T be used without an output capacitor?
Yes, LM4040AEX3-2.5+T is internally compensated and does not require an output capacitor for stability. It remains stable with any capacitive load-including decoupling caps, long traces, or sensor interface capacitance-eliminating risk of oscillation and reducing BOM count. This behavior is confirmed across the full 60μA–15mA operating current range.
What is the minimum cathode-anode current needed for regulation in LM4040AEX3-2.5+T?
The LM4040AEX3-2.5+T requires a minimum shunt current (IRMIN) of 65μA to maintain regulation within specifications at –40°C to +125°C. Below this threshold, output voltage may deviate beyond the ±0.1% initial accuracy band. Designers must size the series resistor to ensure IR ≥ 65μA under worst-case conditions (min supply voltage, max load current).
How does the 0.1% initial accuracy of LM4040AEX3-2.5+T translate to absolute voltage tolerance?
At +25°C, the LM4040AEX3-2.5+T guarantees a reverse breakdown voltage of 2.4975V to 2.5025V (±2.5mV). Over the full –40°C to +125°C range, total tolerance expands to ±19mV (±0.75%) due to tempco contribution-still tighter than most 0.2% or 0.5% grade references in the same package.
Is LM4040AEX3-2.5+T pin-compatible with other LM4040 variants in SC70-3?
Yes, all LM4040 SC70-3 variants-including LM4040AIX3-2.5+T (85°C grade), LM4040BEX3-2.5+T (0.2% grade), and LM4040CEX3-2.5+T (0.5% grade)-share identical pinout, footprint, and terminal functions. Only the top-mark codes (ALJ, ABN, ALK, ALL) and temperature/accuracy grades differ; no PCB redesign is needed when upgrading or downgrading within the SC70-3 family.
LM4040AEX3-2.5+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:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040AEX3-2.5+T FAQ
1.How can I place an order for LM4040AEX3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEX3-2.5+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 LM4040AEX3-2.5+T reliable?
The price and inventory of LM4040AEX3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEX3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040AEX3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEX3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEX3-2.5+T?
LM4040AEX3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEX3-2.5+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 LM4040AEX3-2.5+T?
For technical support, including LM4040AEX3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEX3-2.5+T requirements.
6.How does Aetrix verify that LM4040AEX3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040AEX3-2.5+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 LM4040AEX3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040AEX3-2.5+T?
All LM4040AEX3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEX3-2.5+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 LM4040AEX3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040AEX3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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