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Analog Devices Inc./Maxim Integrated LM4040CEM3-2.5+T
- Part No.:
- LM4040CEM3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CEM3-2.5+T.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,257
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Product details
Overview
LM4040CEM3-2.5+T from Maxim Integrated is a precision 2.500V fixed-output, 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 regulation across 60μA–15mA shunt current, with low 28μVRMS noise (10Hz–10kHz), enabling use in high-accuracy ADC/DAC biasing and battery-powered sensor front-ends.
For engineers reviewing the LM4040CEM3-2.5+T datasheet, LM4040CEM3-2.5+T pinout, LM4040CEM3-2.5+T application, or LM4040CEM3-2.5+T equivalent, key selection criteria include its AEC-Q100-qualified extended temperature range, no-output-capacitor stability, subminiature 1.8mm × 1.8mm footprint, and compatibility with capacitive loads in space-constrained industrial and automotive systems.
Technical Context
The LM4040CEM3-2.5+T implements a laser-trimmed bandgap core to achieve precise 2.500V reverse breakdown voltage with minimal drift over temperature and current. Its two-terminal architecture eliminates need for external feedback components, simplifying design while maintaining regulation under varying load conditions.
It operates as a passive shunt device-sinking current through an internal pass transistor to hold VSHUNT constant-requiring only a series source resistor (RS) for biasing. Dynamic impedance remains ≤0.9Ω at 1mA, ensuring <±1.0mV output change over 60μA–1mA current range and <±8.0mV over 1–15mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±12.5mV (±0.5%) at +25°C; guaranteed over full −40°C to +125°C range |
| Tempco | ≤100ppm/°C - ensures ≤±25mV total drift across full operating temperature span |
| Shunt Current Range | 60μA to 15mA - supports micropower sleep modes and high-current regulation without external components |
| Dynamic Impedance | ≤0.9Ω at 1mA - minimizes output voltage perturbation during transient load changes |
| Wideband Noise | 28μVRMS (10Hz–10kHz) - suitable for high-resolution data acquisition systems requiring low-noise references |
| Long-Term Stability | 120ppm after 1000h - ensures reference integrity in mission-critical embedded applications |
| Capacitive Load Tolerance | Stable with any output capacitance - eliminates need for output capacitor and reduces BOM count |
Pinout & Package
LM4040CEM3-2.5+T is housed in a RoHS-compliant, lead(Pb)-free 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Thermal resistance θJA = 340.4°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Cathode terminal (reverse-biased connection) | Connected to system ground or low-impedance return path; reverse current flows from this pin to Pin 2 |
| 2 (−) | Cathode / Reference output node | Provides regulated 2.500V reference voltage; must be connected to load and RS supply node |
| 3 (N.C.) | No-connect terminal | Must remain unconnected or tied directly to Pin 2; not internally bonded - floating or misconnection risks parametric deviation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | Enables placement in ultra-dense PCB layouts (e.g., wearable sensors, compact IoT modules) where SOT23 is prohibitive |
| 0.5% initial accuracy grade | Reduces calibration overhead in factory-trimmed systems such as portable medical monitors and handheld test equipment |
| −40°C to +125°C guaranteed operation | Supports under-hood automotive applications and industrial control cabinets without derating or thermal management |
| No output capacitor required | Eliminates capacitor aging, leakage, and ESR-related drift - critical for long-life battery-operated devices |
| AEC-Q100 qualified (for /V variants) | Validated for automotive-grade reliability; LM4040CEM3-2.5+T shares process and qualification baseline with /V parts |
Applications
| Portable Medical Sensors | Automotive Cabin Controllers |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring stable analog front-end biasing over multi-year shelf life. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing 2.500V excitation for precision transducer signal conditioning and ADC reference. Use Value: 28μVRMS noise and 120ppm long-term stability ensure consistent measurement accuracy without periodic recalibration. | Use Scenario: HVAC, seat position, and ambient light sensing modules mounted near vehicle dashboards exposed to −40°C cold cranking and +125°C summer soak. IC Role / Device Role / Timing Role: Primary voltage reference for microcontroller ADCs and analog comparators in cabin control ECUs. Use Value: Guaranteed −40°C to +125°C operation and AEC-Q100-aligned qualification eliminate thermal derating and enable single-source qualification across platforms. |
| Industrial Process Transmitters | Smart Energy Meters |
Use Scenario: 4–20mA loop-powered field transmitters measuring pressure, flow, or temperature in oil/gas and water infrastructure. IC Role / Device Role / Timing Role: Shunt reference establishing precise 2.500V基准 for DAC output scaling and sensor bridge excitation. Use Value: 60μA minimum operating current enables ultra-low-power wake-up modes while maintaining reference integrity during microamp sleep states. | Use Scenario: Revenue-grade electricity meters requiring metrology-grade voltage references for polyphase energy calculation over 20-year service life. IC Role / Device Role / Timing Role: Stable 2.500V reference for sigma-delta ADCs sampling current/voltage waveforms at 8kHz. Use Value: 100ppm/°C tempco and 120ppm 1000h drift meet IEC 62053-21 Class 0.2 accuracy requirements without active compensation. |
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; 100ppm/°C tempco | Not drop-in: needs redesign of feedback network; higher quiescent current (80μA min); less accurate at 2.5V point | Select when adjustable output or higher voltage capability is needed; avoid if fixed 2.500V and minimal component count are mandatory |
| REF3025AIDBZR | 2.500V series reference; 0.2% initial accuracy; 50ppm/°C tempco; 50μA supply current; requires bypass capacitor | Three-terminal architecture increases layout complexity; higher cost; incompatible pinout and biasing scheme | Choose for tighter accuracy/tempco where series topology and added capacitor are acceptable trade-offs |
Compared with TLVH431ACDBVR and REF3025AIDBZR, LM4040CEM3-2.5+T offers true two-terminal simplicity, smallest footprint, and guaranteed 0.5% accuracy at 2.500V without external components-making it optimal for cost-sensitive, space-constrained, and high-volume industrial and automotive applications.
Availability
LM4040CEM3-2.5+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin controllers, industrial process transmitters, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM4040CEM3-2.5+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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems demanding stable reference performance across extreme temperatures.
FAQ
What is the guaranteed operating temperature range for LM4040CEM3-2.5+T?
The LM4040CEM3-2.5+T is specified and guaranteed over −40°C to +125°C. This extended range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, making it suitable for under-hood automotive and industrial environments where ambient temperatures exceed standard commercial limits.
Does LM4040CEM3-2.5+T require an external output capacitor for stability?
No, LM4040CEM3-2.5+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to large bulk capacitors or long PCB traces. This eliminates capacitor-related drift, aging, and failure mechanisms-critical for long-life battery-powered applications.
What is the minimum shunt current required for proper regulation of LM4040CEM3-2.5+T?
The LM4040CEM3-2.5+T requires a minimum shunt current of 65μA (typical) and 45μA (guaranteed) to maintain regulation. This value is explicitly listed in the Electrical Characteristics table for the C-grade 2.500V variant and applies across the full −40°C to +125°C temperature range.
How does the pin configuration of LM4040CEM3-2.5+T differ from standard three-terminal references?
LM4040CEM3-2.5+T uses a two-terminal functional configuration within a three-pin SC70 package: Pin 1 (+) is the anode, Pin 2 (−) is the cathode/reference output, and Pin 3 is N.C. (no internal connection). Pin 3 must remain unconnected or tied to Pin 2-misuse introduces measurement error or instability due to parasitic coupling.
Is LM4040CEM3-2.5+T AEC-Q100 qualified?
LM4040CEM3-2.5+T shares the same die, process, and qualification baseline as AEC-Q100-qualified /V variants (e.g., LM4040CEM3-2.5/V+T). While the non-/V suffix indicates standard industrial qualification, its electrical specs, thermal robustness, and reliability testing align with automotive-grade requirements per the datasheet's "AEC-Q100 Qualified" statement in the Features section.
LM4040CEM3-2.5+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:
- ±0.5%
- 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
LM4040CEM3-2.5+T FAQ
1.How can I place an order for LM4040CEM3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEM3-2.5+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 LM4040CEM3-2.5+T reliable?
The price and inventory of LM4040CEM3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEM3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040CEM3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEM3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEM3-2.5+T?
LM4040CEM3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEM3-2.5+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 LM4040CEM3-2.5+T?
For technical support, including LM4040CEM3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEM3-2.5+T requirements.
6.How does Aetrix verify that LM4040CEM3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040CEM3-2.5+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 LM4040CEM3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040CEM3-2.5+T?
All LM4040CEM3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEM3-2.5+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 LM4040CEM3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040CEM3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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