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Analog Devices Inc./Maxim Integrated LM4040BEX3-2.5+T
- Part No.:
- LM4040BEX3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BEX3-2.5+T.pdf
- Description:
- IC VREF SHUNT 2.5V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
LM4040BEX3-2.5+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 guaranteed operation from –40°C to +125°C. It delivers stable reverse-breakdown voltage with 60μA–15mA shunt current capability and low 28μVRMS noise (10Hz–10kHz), ideal for high-accuracy analog sensing and ADC reference in space-constrained industrial and automotive systems.
For engineers reviewing the LM4040BEX3-2.5+T datasheet, LM4040BEX3-2.5+T pinout, LM4040BEX3-2.5+T application, or LM4040BEX3-2.5+T equivalent, key selection criteria include its ultra-small SC70 footprint, AEC-Q100 qualification for automotive use, no-output-capacitor stability, and compatibility with capacitive loads across wide current and temperature ranges.
Technical Context
The LM4040BEX3-2.5+T implements a laser-trimmed bandgap shunt architecture that maintains precise 2.500V reverse breakdown without external stabilization components. Its dynamic impedance remains ≤0.8Ω at 1mA, enabling stable regulation under load transients up to 10mA step changes.
Designed for high-reliability environments, it tolerates full-range capacitive loading and exhibits long-term stability of 120ppm over 1000 hours. The device operates as a two-terminal element-cathode and anode-with pin 3 internally unconnected-enabling direct integration into compact voltage-divider or feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.2% at +25°C - ensures accurate ADC reference or sensor biasing within 5mV tolerance |
| Initial Accuracy | ±0.2% (B-grade) - supports 12-bit system accuracy without calibration |
| Temp Coefficient | 100ppm/°C max - limits drift to ±12.5mV over –40°C to +125°C range |
| Shunt Current Range | 60μA to 15mA - enables low-power standby and high-current regulation in same device |
| Output Noise | 28μVRMS (10Hz–10kHz) - minimizes noise contribution in precision measurement front-ends |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
| Dynamic Impedance | ≤0.8Ω at 1mA - maintains voltage stability during fast load transients |
Pinout & Package
LM4040BEX3-2.5+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is internally unconnected and must be left floating or tied to pin 2 (cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode | Positive terminal; connects to regulated output node in shunt configuration |
| 2 (–) | Cathode | Negative terminal; connects to ground or return path; primary current sink node |
| 3 (N.C.) | No Connection | Internally unconnected; must remain unconnected or tied to pin 2 to avoid parasitic leakage |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint saves >50% board area vs. SOT23 equivalents |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout constraints |
| AEC-Q100 qualified | Validated for automotive applications per Grade 1 temperature requirements |
| Low micropower operation | 60μA minimum operating current enables battery-powered metering designs |
| Laser-trimmed accuracy | Guaranteed ±0.2% initial tolerance reduces need for system-level trimming |
Applications
| Portable Medical Sensors | Automotive Engine Control Units |
|---|---|
Use Scenario: Battery-powered handheld glucose meters requiring stable 2.5V reference for 12-bit ADC conversion. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precise, low-drift voltage for analog front-end signal conditioning. Use Value: Enables <1 LSB error over full temperature range without calibration, extending battery life via 60μA min operating current. | Use Scenario: Reference voltage for oxygen sensor signal conditioning in exhaust management systems. IC Role / Device Role / Timing Role: High-stability shunt reference maintaining 2.500V under thermal cycling and EMI-rich engine bay conditions. Use Value: AEC-Q100 qualification and –40°C to +125°C operation ensure functional safety compliance and long-term reliability. |
| Industrial Process Transmitters | Smart Energy Meters |
Use Scenario: 4–20mA loop-powered pressure transmitter needing accurate excitation and ADC reference. IC Role / Device Role / Timing Role: Precision shunt reference sourcing stable 2.5V from limited loop power budget. Use Value: Low 28μVRMS noise and ≤0.8Ω dynamic impedance prevent measurement uncertainty in 16-bit sigma-delta converters. | Use Scenario: Reference for metrology-grade energy measurement ICs in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Primary voltage reference for polyphase energy ASICs requiring long-term stability and low thermal drift. Use Value: 120ppm long-term stability over 1000h and 100ppm/°C tempco meet IEC 62053-21 Class 0.2 accuracy requirements. |
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; higher 200ppm/°C tempco; SOT23-3 | Requires external resistors for 2.5V setting; less stable over temperature; not AEC-Q100 qualified | Select when adjustable output or higher voltage capability is needed; verify thermal drift impact on system accuracy |
| ADR3425ARJZ-R7 | Fixed 2.5V; 0.1% initial accuracy; 10ppm/°C tempco; SC70-5; higher 3.5mA quiescent current | Three-terminal series reference; requires supply headroom; larger footprint; no capacitive-load tolerance | Choose for ultra-low drift (<±0.025mV) where supply margin exists and layout allows SC70-5 |
Compared with TLVH431ACDBVR and ADR3425ARJZ-R7, the LM4040BEX3-2.5+T offers optimal balance of size, accuracy, temperature stability, and ease of use in shunt configurations-especially where AEC-Q100 compliance, zero external components, and minimal PCB area are critical.
Availability
LM4040BEX3-2.5+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive engine control units, industrial process transmitters, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040BEX3-2.5+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, high-reliability systems requiring guaranteed performance across –40°C to +125°C.
FAQ
What is the guaranteed operating temperature range for LM4040BEX3-2.5+T?
The LM4040BEX3-2.5+T is specified and guaranteed over –40°C to +125°C ambient temperature. This extended range, combined with AEC-Q100 qualification, makes it suitable for under-hood automotive and industrial control applications where thermal robustness is essential. The device maintains its ±0.2% initial accuracy and 100ppm/°C tempco across this full range.
Does LM4040BEX3-2.5+T require an external output capacitor for stability?
No, the LM4040BEX3-2.5+T does not require an external output capacitor and is stable with any capacitive load. Its internal design ensures frequency stability without added components-reducing BOM count, PCB area, and potential failure modes. This feature simplifies layout and improves reliability in noise-sensitive applications like precision ADC references.
What is the function of pin 3 on LM4040BEX3-2.5+T?
Pin 3 on the LM4040BEX3-2.5+T is marked N.C. (No Connection) and is internally unconnected. It must either be left floating or tied directly to pin 2 (cathode). Connecting pin 3 to any other net may introduce leakage paths or degrade accuracy. This design simplifies routing in ultra-dense layouts while preserving performance integrity.
How does the shunt current range of LM4040BEX3-2.5+T affect circuit design?
The LM4040BEX3-2.5+T operates reliably from 60μA to 15mA shunt current. Designers must select the series resistor (RS) to maintain ≥60μA under worst-case conditions (min supply, max load) and ≤15mA under best-case (max supply, min load). Exceeding 15mA risks exceeding absolute maximum ratings; staying above 60μA ensures regulation accuracy and noise performance.
Is LM4040BEX3-2.5+T RoHS-compliant and lead-free?
Yes, the "+" suffix in LM4040BEX3-2.5+T indicates a lead(Pb)-free and RoHS-compliant package. The device meets EU RoHS Directive 2011/65/EU requirements and is compatible with standard lead-free reflow soldering profiles (peak temperature +260°C). The SC70-3 package uses matte tin plating and is fully compatible with automated assembly processes.
LM4040BEX3-2.5+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:
- ±0.2%
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040BEX3-2.5+T FAQ
1.How can I place an order for LM4040BEX3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BEX3-2.5+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 LM4040BEX3-2.5+T reliable?
The price and inventory of LM4040BEX3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BEX3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040BEX3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BEX3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BEX3-2.5+T?
LM4040BEX3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BEX3-2.5+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 LM4040BEX3-2.5+T?
For technical support, including LM4040BEX3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BEX3-2.5+T requirements.
6.How does Aetrix verify that LM4040BEX3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040BEX3-2.5+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 LM4040BEX3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040BEX3-2.5+T?
All LM4040BEX3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BEX3-2.5+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 LM4040BEX3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040BEX3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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