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Analog Devices Inc./Maxim Integrated LM4040CEX3-2.5+T
- Part No.:
- LM4040CEX3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CEX3-2.5+T.pdf
- Description:
- IC VREF SHUNT 0.5% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,870
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Product details
Overview
LM4040CEX3-2.5+T from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.5% 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 wideband noise (10Hz–10kHz), ideal for high-accuracy analog sensing and power-supply monitoring in space-constrained industrial and automotive systems.
For engineers reviewing the LM4040CEX3-2.5+T datasheet, LM4040CEX3-2.5+T pinout, LM4040CEX3-2.5+T application, or LM4040CEX3-2.5+T equivalent, key selection criteria include its fixed 2.500V output, SC70-3 footprint compatibility, extended temperature range, no-output-capacitor requirement, and AEC-Q100 qualification suitability for automotive-grade designs.
Technical Context
The LM4040CEX3-2.5+T implements a bandgap-based shunt reference architecture, behaving electrically like a precision zener diode with cathode-anode reverse breakdown at exactly 2.500V (±12.5mV over temperature). Its laser-trimmed resistor network ensures tight initial tolerance, while internal design guarantees stability across capacitive loads without external compensation.
It operates exclusively in reverse-bias mode for regulation, sinking 60μA–15mA of shunt current to maintain output voltage accuracy. The device exhibits low dynamic impedance (≤0.9Ω at 1mA), enabling robust performance under varying load and supply conditions across its full –40°C to +125°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±12.5mV (C-grade, TA = +25°C); enables precise ADC/DAC biasing and sensor excitation |
| Initial Accuracy | ±0.5% (±12.5mV) - supports 12-bit system accuracy without calibration |
| Tempco | 100ppm/°C max - limits drift to ±25mV over –40°C to +125°C span |
| Shunt Current Range | 60μA to 15mA - accommodates ultra-low-power and higher-current regulation needs |
| Wideband Noise | 28μVRMS (10Hz–10kHz) - minimizes noise contribution in precision measurement front-ends |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Package | SC70-3 (1.8mm × 1.8mm) - 50% smaller than SOT23, saves PCB area in portable designs |
Pinout & Package
LM4040CEX3-2.5+T uses the 3-pin SC70 surface-mount package (Outline 21-0075, Land Pattern 90-0208), measuring 1.8mm × 1.8mm × 0.9mm with RoHS-compliant lead-free finish. 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 regulated voltage node and current-limiting resistor |
| 2 (–) | Anode | Reference ground return; forms shunt path with pin 1 to sink excess current |
| 3 (N.C.) | No Connection | Internally unconnected; must be left floating or shorted to pin 2 per datasheet directive |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area reduces PCB real estate by 50% vs. SOT23 equivalents |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout complexity |
| Low 28μVRMS noise | Enables high-resolution data acquisition without added filtering stages |
| AEC-Q100 qualified option | LM4040CEX3-2.5+T meets automotive reliability standards for under-hood applications |
| 100ppm/°C tempco | Ensures ≤±25mV total drift over full industrial temperature range |
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 excitation voltage for electrochemical sensor interface circuitry. Use Value: SC70-3 size enables compact PCB layout; ±0.5% accuracy and low noise ensure diagnostic-grade measurement repeatability. | Use Scenario: Fuel injector driver module needing reliable 2.5V reference for current-sense amplifier feedback. IC Role / Device Role / Timing Role: High-stability voltage reference maintaining closed-loop accuracy across –40°C to +125°C ambient. Use Value: AEC-Q100-compatible grade and 100ppm/°C tempco guarantee consistent performance during cold cranking and hot idle conditions. |
| Industrial PLC Analog Input Modules | Wireless IoT Sensor Nodes |
Use Scenario: 4–20mA transmitter circuit where 2.5V reference sets DAC full-scale output. IC Role / Device Role / Timing Role: Precision shunt reference establishing accurate current loop scaling independent of supply variation. Use Value: 60μA minimum operating current allows operation from energy-harvesting sources; no capacitor needed simplifies conformal coating. | Use Scenario: LoRaWAN environmental node using ultra-low-power microcontroller with integrated ADC. IC Role / Device Role / Timing Role: Micropower shunt reference supplying stable VREF to MCU's SAR ADC during intermittent wake-up cycles. Use Value: 60μA–15mA shunt range matches duty-cycled operation; SC70-3 footprint aligns with miniaturized antenna-integrated PCBs. |
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; requires two external resistors; 2% initial accuracy; SOT23-3 package | Used where programmable reference or higher voltage (>5V) is needed; less accurate and noisier (75μVRMS) | Select when flexibility outweighs precision; not drop-in for fixed 2.5V use |
| MAX6008AEUR+T | Fixed 2.5V; ±0.2% initial accuracy; 50ppm/°C tempco; SOT23-3; 35μVRMS noise | Higher accuracy and lower drift, but larger SOT23 footprint and no AEC-Q100 qualification | Choose for tighter spec compliance in non-automotive industrial designs |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040CEX3-2.5+T offers the optimal balance of SC70-3 miniaturization, AEC-Q100 readiness, and C-grade precision-making it preferred for automotive and space-constrained industrial references where fixed 2.5V output is required.
Availability
LM4040CEX3-2.5+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive engine control units, industrial PLC analog input modules, and wireless IoT sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040CEX3-2.5+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 shunt voltage references optimized for space-constrained, high-reliability systems requiring stable, accurate, and capacitor-free voltage regulation across extended temperature ranges.
FAQ
What is the exact output voltage tolerance of LM4040CEX3-2.5+T at +25°C?
The LM4040CEX3-2.5+T has a nominal output voltage of 2.500V with a ±0.5% initial accuracy, corresponding to ±12.5mV tolerance at +25°C. This is confirmed in the Electrical Characteristics table for the C-grade 2.500V variant, where min/max values are specified as 2.4875V and 2.5125V respectively. The LM4040CEX3-2.5+T maintains this specification across its full operating temperature range.
Does LM4040CEX3-2.5+T require an external output capacitor for stability?
No, LM4040CEX3-2.5+T does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load, including zero capacitance. This eliminates BOM cost, layout constraints, and reliability risks associated with external capacitors-confirmed in both the General Description and Applications Information sections of the datasheet.
What is the maximum operating temperature range supported by LM4040CEX3-2.5+T?
The LM4040CEX3-2.5+T is rated for operation from –40°C to +125°C, as indicated by the "E" suffix in its part number (LM4040E_ _ _). This extended temperature range is validated per JEDEC specifications and applies to both electrical performance and reliability. The device's junction temperature limit remains +150°C, allowing safe operation within this ambient envelope under typical power dissipation conditions.
How many pins does LM4040CEX3-2.5+T have, and what is the function of pin 3?
LM4040CEX3-2.5+T has three pins in its SC70-3 package. Pin 1 is the cathode (+), pin 2 is the anode (–), and pin 3 is labeled N.C. (No Connection). Per the Pin Description and Pin Configuration diagrams, pin 3 must be left unconnected or tied directly to pin 2-it is not internally bonded and serves no functional role in the reference operation.
Is LM4040CEX3-2.5+T qualified for automotive applications?
Yes, LM4040CEX3-2.5+T is AEC-Q100 qualified for automotive applications. The datasheet explicitly states "AEC-Q100 Qualified" in the Benefits and Features section, and the "E" temperature grade (–40°C to +125°C) combined with robust construction makes it suitable for under-hood and body-control module use. While the base part number does not include the "/V" automotive identification suffix, its qualification status is documented and verified in the official Maxim Integrated datasheet.
LM4040CEX3-2.5+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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 50µVrms
- 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
LM4040CEX3-2.5+T FAQ
1.How can I place an order for LM4040CEX3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEX3-2.5+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 LM4040CEX3-2.5+T reliable?
The price and inventory of LM4040CEX3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEX3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040CEX3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEX3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEX3-2.5+T?
LM4040CEX3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEX3-2.5+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 LM4040CEX3-2.5+T?
For technical support, including LM4040CEX3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEX3-2.5+T requirements.
6.How does Aetrix verify that LM4040CEX3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040CEX3-2.5+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 LM4040CEX3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040CEX3-2.5+T?
All LM4040CEX3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEX3-2.5+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 LM4040CEX3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040CEX3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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