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Analog Devices Inc./Maxim Integrated LM4040BEM3-2.5+T
- Part No.:
- LM4040BEM3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040BEM3-2.5+T.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,798
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Product details
Overview
LM4040BEM3-2.5+T from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy, 100ppm/°C max temperature coefficient, and stable operation from −40°C to +125°C. It delivers low 28µVRMS noise (10Hz–10kHz) and supports 60µA–15mA shunt current, ideal for high-accuracy analog sensing and ADC reference in automotive and industrial power rails.
For engineers reviewing the LM4040BEM3-2.5+T datasheet, LM4040BEM3-2.5+T pinout, LM4040BEM3-2.5+T application, or LM4040BEM3-2.5+T equivalent, key selection criteria include guaranteed extended-temperature performance, no-output-capacitor stability, micropower operation down to 60µA, and compatibility with capacitive loads in space-constrained designs.
Technical Context
The LM4040BEM3-2.5+T uses bandgap-based shunt regulation to maintain a precise 2.500V reverse breakdown voltage across its cathode-anode terminals. Its laser-trimmed resistor network ensures ±0.2% initial tolerance at +25°C, with overtemperature drift bounded by ±0.85% across −40°C to +125°C per datasheet Note 2.
It operates as a two-terminal device requiring only an external series resistor to set shunt current, eliminating need for supply decoupling capacitors while remaining stable under any capacitive load. Dynamic impedance is ≤0.8Ω at 1mA, enabling fast transient response in feedback loops and precision reference buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.2% at +25°C - enables direct interface with 2.5V ADCs and DACs without scaling. |
| Initial Accuracy | ±0.2% (Grade B) - meets tight tolerance requirements for calibration-grade instrumentation. |
| Temp Coefficient | 100ppm/°C max - limits voltage drift to ±250µV over full −40°C to +125°C range. |
| Shunt Current Range | 60µA to 15mA - supports ultra-low-power sensor nodes and higher-current reference buffers. |
| Output Noise | 28µVRMS (10Hz–10kHz) - minimizes quantization error in 16-bit+ data acquisition systems. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
| Dynamic Impedance | ≤0.8Ω at 1mA - ensures minimal load-induced voltage shift during dynamic current changes. |
Pinout & Package
LM4040BEM3-2.5+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 (+) | Cathode | Reverse-biased terminal - connects to regulated voltage node; sinks shunt current. |
| 2 (−) | Anode | Reference ground terminal - forms return path for shunt current and defines output reference point. |
| 3 (N.C.) | No Connection | Internally unconnected - must remain unconnected or tied to pin 2; not usable as a functional pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - saves PCB real estate in portable and wearable electronics. |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout complexity of external stabilization caps. |
| Micropower minimum operating current | 60µA - enables use in battery-powered systems with multi-year standby life. |
| Extended temperature grade | −40°C to +125°C operation - supports AEC-Q100-aligned automotive and harsh-environment applications. |
| Low wideband noise | 28µVRMS (10Hz–10kHz) - preserves signal integrity in precision measurement front-ends. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Process Transmitter |
|---|---|
Use Scenario: Providing stable 2.5V reference for analog-to-digital conversion of engine coolant temperature and oxygen sensor signals. IC Role / Device Role / Timing Role: Two-terminal shunt reference regulating voltage at ADC input stage under varying battery voltage and thermal stress. Use Value: Maintains ±0.2% accuracy across −40°C to +125°C, ensuring consistent sensor calibration without recalibration cycles. | Use Scenario: Supplying precision reference for 4–20mA loop-powered pressure and flow transmitters. IC Role / Device Role / Timing Role: Shunt reference establishing accurate excitation voltage for bridge sensors and reference for DAC-controlled current output. Use Value: 60µA–15mA operating range accommodates low-quiescent microcontrollers while supporting full-scale loop current drive. |
| Portable Medical Glucose Monitor | High-Resolution Data Acquisition System |
Use Scenario: Reference source for electrochemical sensor signal conditioning in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-noise 2.5V shunt reference feeding instrumentation amplifier and SAR ADC in battery-operated platform. Use Value: 28µVRMS noise and <0.8Ω dynamic impedance minimize measurement uncertainty in sub-100µV signal detection. | Use Scenario: Primary reference for 24-bit delta-sigma ADCs in test equipment and calibration standards. IC Role / Device Role / Timing Role: Precision shunt reference delivering stable 2.500V with minimal drift and load sensitivity in metrology-grade circuits. Use Value: Laser-trimmed ±0.2% accuracy and 100ppm/°C TC ensure traceable measurement accuracy compliant with ISO/IEC 17025. |
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; SOT23-3; 100ppm/°C TC | Requires two external resistors for 2.5V setting; higher minimum cathode current (80µA) | Select when adjustable output or higher voltage capability is needed; verify layout for resistor placement and thermal coupling. |
| MAX6008BEUR+T | Fixed 2.5V; 0.2% accuracy; SOT23-3; 75ppm/°C TC; 50µA–20mA range | Lower tempco and lower min current, but rated only to +85°C (not +125°C) | Prefer for commercial-temperature applications where tighter TC and lower quiescent current outweigh extended-temp requirement. |
Compared with TLVH431ACDBVR and MAX6008BEUR+T, LM4040BEM3-2.5+T uniquely combines AEC-Q100-aligned −40°C to +125°C operation, SC70 size, and guaranteed 2.500V ±0.2% accuracy without external components-making it optimal for space- and reliability-critical automotive and industrial modules.
Availability
LM4040BEM3-2.5+T is available at Aetrix Electronics and suitable for automotive ECU design, industrial process transmitter development, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040BEM3-2.5+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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, extended-temperature systems where stability, low noise, and zero-output-capacitor operation are critical.
FAQ
What is the guaranteed operating temperature range for LM4040BEM3-2.5+T?
The LM4040BEM3-2.5+T is specified for continuous operation from −40°C to +125°C. This extended temperature grade is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, making it suitable for under-hood automotive and industrial control applications where ambient temperatures exceed +85°C.
Does LM4040BEM3-2.5+T require an external output capacitor for stability?
No, LM4040BEM3-2.5+T does not require an external output capacitor. The device is internally compensated and remains stable with any capacitive load, including direct connection to ADC input capacitors or long PCB traces. This eliminates BOM cost and layout constraints associated with external stabilization networks.
What is the minimum shunt current needed for LM4040BEM3-2.5+T to maintain regulation?
The LM4040BEM3-2.5+T requires a minimum shunt current of 60µA to maintain regulation across its full temperature range. This value is specified in the Electrical Characteristics table for the B grade at −40°C to +125°C and is critical for designing the series current-limiting resistor in low-power applications.
How does the pin configuration of LM4040BEM3-2.5+T differ from standard three-terminal regulators?
LM4040BEM3-2.5+T uses a two-terminal shunt topology with pins 1 (+) and 2 (−) forming the cathode-anode path; pin 3 is N.C. and must remain unconnected or tied to pin 2. Unlike series regulators, it sinks current rather than sourcing it, and requires no input/output pins-only a single series resistor to bias the reference node.
Is LM4040BEM3-2.5+T qualified for automotive applications?
Yes, LM4040BEM3-2.5+T is AEC-Q100 qualified for automotive use. The datasheet explicitly states "AEC-Q100 Qualified" in the Benefits and Features section, and the "E" suffix in the part number denotes the −40°C to +125°C grade required for automotive under-hood environments.
LM4040BEM3-2.5+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- ±0.2%
- 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:
- SOT-23-3
LM4040BEM3-2.5+T FAQ
1.How can I place an order for LM4040BEM3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BEM3-2.5+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 LM4040BEM3-2.5+T reliable?
The price and inventory of LM4040BEM3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BEM3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040BEM3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BEM3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BEM3-2.5+T?
LM4040BEM3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BEM3-2.5+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 LM4040BEM3-2.5+T?
For technical support, including LM4040BEM3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BEM3-2.5+T requirements.
6.How does Aetrix verify that LM4040BEM3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040BEM3-2.5+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 LM4040BEM3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040BEM3-2.5+T?
All LM4040BEM3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BEM3-2.5+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 LM4040BEM3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040BEM3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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