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Analog Devices Inc./Maxim Integrated LM4040AEM3-2.5+T
- Part No.:
- LM4040AEM3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AEM3-2.5+T.pdf
- Description:
- IC VREF SHUNT 2.5V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,294
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Product details
Overview
LM4040AEM3-2.5+T from Maxim Integrated is a precision 2.500V fixed-output, two-terminal shunt voltage reference in SC70-3 package, featuring ±0.1% initial accuracy, 100ppm/°C max temperature coefficient, and guaranteed operation from −40°C to +125°C. It delivers stable reverse breakdown voltage across 60μA–15mA shunt current with low 0.8Ω dynamic impedance, ideal for high-accuracy analog sensing and ADC/DAC biasing in automotive and industrial power rails.
For engineers reviewing the LM4040AEM3-2.5+T datasheet, LM4040AEM3-2.5+T pinout, LM4040AEM3-2.5+T application, or LM4040AEM3-2.5+T equivalent, key selection criteria include its A-grade accuracy, extended temperature range, SC70 footprint compatibility, and absence of required output capacitance-critical for space-constrained, high-reliability embedded systems.
Technical Context
The LM4040AEM3-2.5+T uses laser-trimmed bandgap circuitry to achieve 2.500V nominal reverse breakdown voltage with ±2.5mV (±0.1%) tolerance at +25°C and ±19mV overtemperature (−40°C to +125°C). Its shunt architecture requires no external capacitor and tolerates arbitrary capacitive loads while maintaining stability.
It operates as a two-terminal device: cathode (Pin 1) and anode (Pin 2), with Pin 3 internally unconnected. The device sinks current between 60μA and 15mA to regulate voltage, exhibiting 28μVRMS wideband noise (10Hz–10kHz) and <1.0mV voltage change over 60μA–1mA current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±2.5mV at +25°C; ±19mV over full −40°C to +125°C range-enables direct replacement of 2.5V references in precision data converters. |
| Initial Accuracy | ±0.1% (Grade A)-guarantees ≤±2.5mV deviation at room temperature, reducing calibration burden in factory test setups. |
| Tempco | 100ppm/°C max-limits worst-case drift to ±250μV/°C, supporting stable performance in under-hood automotive environments. |
| Shunt Current Range | 60μA to 15mA-supports ultra-low-power sensor nodes (<100μA quiescent) and higher-current reference buffering without external active circuitry. |
| Dynamic Impedance | 0.8Ω max at 1mA-ensures <0.8mV output perturbation under 1mA load transients, critical for SAR ADC reference stability. |
| Wideband Noise | 28μVRMS (10Hz–10kHz)-low enough to avoid degrading ENOB in 16-bit ADCs when used as reference source. |
| Long-Term Stability | 120ppm after 1000h-predictable aging behavior supports 10+ year system lifetime specifications in industrial controllers. |
Pinout & Package
LM4040AEM3-2.5+T is housed in a RoHS-compliant 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents, with thermal resistance θJA = 340.4°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node; sinks all shunt current. |
| 2 (–) | Anode | Reference ground return path; must be tied to system ground or low-impedance return plane. |
| 3 (N.C.) | No Connection | Internally unconnected; must remain floating or tied to Pin 2-never driven or loaded. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in dense PCB layouts where SOT23 is prohibitive-e.g., wearable medical sensors. |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk associated with external COUT selection. |
| Extended temperature grade (−40°C to +125°C) | Qualified for under-hood automotive and industrial control applications without derating or thermal margin penalties. |
| Low 28μVRMS noise | Meets noise floor requirements for 16-bit precision data acquisition systems without additional filtering. |
| AEC-Q100 qualified (for /V variants) | While LM4040AEM3-2.5+T itself is not /V-marked, its E-grade construction shares process and qualification lineage with AEC-Q100-compliant versions. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 4–20mA Transmitter |
|---|---|
Use Scenario: Provides stable 2.5V reference for microcontroller ADC measuring throttle position and oxygen sensor signals in engine bay. IC Role / Device Role / Timing Role: Two-terminal shunt reference regulating voltage via controlled current sink; no timing function. Use Value: Maintains ±19mV accuracy across −40°C to +125°C ambient, eliminating need for software temperature compensation in closed-loop fuel injection algorithms. | Use Scenario: Supplies precise 2.5V reference to DAC and op-amp circuitry generating calibrated 4–20mA loop current. IC Role / Device Role / Timing Role: Shunt-mode voltage reference establishing absolute scale for current output; zero timing dependency. Use Value: 0.1% initial accuracy ensures transmitter output error remains within ±0.04mA over full temperature range, meeting IEC 61000-4-2 immunity requirements. |
| Portable Medical Glucose Monitor | High-Density PLC Analog Input Module |
Use Scenario: Powers electrochemical sensor front-end and 16-bit sigma-delta ADC in battery-operated handheld glucose meter. IC Role / Device Role / Timing Role: Low-noise, micropower shunt reference enabling accurate sensor signal digitization; no clock or timing role. Use Value: 28μVRMS noise and 60μA minimum operating current extend battery life >30% versus standard bandgap references while preserving 15.5 ENOB. | Use Scenario: Delivers common 2.5V reference to 16-channel simultaneous-sampling ADC in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Shared precision reference source for multi-channel analog acquisition; no timing or synchronization function. Use Value: 0.8Ω dynamic impedance prevents crosstalk-induced voltage droop during channel switching, maintaining inter-channel gain matching to ±0.01%. |
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 tempco; 1mA min current | Requires two external resistors for 2.5V setting; higher minimum current increases power loss in ultra-low-power designs | Choose when adjustable output or higher voltage capability is needed; avoid if strict 2.5V fixed output and sub-100μA operation are mandatory. |
| REF3025AIDBZR | 2.5V series reference; 0.2% initial accuracy; SOT23-3; 50ppm/°C tempco; 25μA quiescent; 25mA max output | Three-terminal series topology requires separate input/output pins; cannot replace shunt configuration without circuit redesign | Choose only if system allows series-reference topology and lower tempco justifies added complexity and cost; not drop-in compatible. |
Compared with TLVH431ACDBVR and REF3025AIDBZR, the LM4040AEM3-2.5+T offers true two-terminal simplicity, lowest minimum operating current (60μA), and guaranteed SC70 size-making it optimal for fixed-voltage, space-constrained, and ultra-low-power shunt reference roles where resistor networks or extra pins are unacceptable.
Availability
LM4040AEM3-2.5+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial 4–20mA transmitters, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040AEM3-2.5+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, emphasizing high reliability and parametric consistency.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained systems needing stable, capacitor-free voltage regulation across harsh temperature environments.
FAQ
What is the guaranteed operating temperature range for LM4040AEM3-2.5+T?
The LM4040AEM3-2.5+T is specified and guaranteed over −40°C to +125°C. This extended temperature range is confirmed by the "E" suffix in the part number and applies to all electrical parameters including initial accuracy, tempco, and shunt current limits-making it suitable for under-hood automotive and industrial control applications where ambient temperatures exceed +85°C.
Does LM4040AEM3-2.5+T require an external output capacitor for stability?
No, the LM4040AEM3-2.5+T does not require an external output capacitor and is stable with any capacitive load. This is explicitly guaranteed in the datasheet and stems from its internal shunt architecture and frequency-compensated design-eliminating capacitor selection, footprint, and reliability concerns in compact, high-density PCB layouts.
What is the maximum shunt current rating for LM4040AEM3-2.5+T before damage occurs?
The absolute maximum reverse current for LM4040AEM3-2.5+T is 20mA. While normal operation spans 60μA to 15mA, exceeding 20mA-even momentarily-risks permanent damage. Designers must ensure the series resistor (RS) limits peak shunt current to ≤20mA under worst-case conditions of maximum supply voltage and minimum load current.
How does the pinout of LM4040AEM3-2.5+T differ from standard three-terminal references?
LM4040AEM3-2.5+T uses a two-terminal shunt configuration: Pin 1 is cathode (+), Pin 2 is anode (–), and Pin 3 is N.C. (no connection). Unlike three-terminal series references, it has no dedicated input or output pin-voltage regulation occurs across Pins 1 and 2 only. Pin 3 must remain unconnected or tied to Pin 2; driving it violates absolute maximum ratings.
Is LM4040AEM3-2.5+T AEC-Q100 qualified?
The LM4040AEM3-2.5+T itself is not marked with the /V suffix indicating formal AEC-Q100 qualification. However, the "E" grade (−40°C to +125°C) and manufacturing process are shared with /V variants like LM4040AEM3-2.5/V+T, which are AEC-Q100 qualified. For automotive safety-critical applications, the /V version should be selected; LM4040AEM3-2.5+T is appropriate for non-safety automotive subsystems and industrial use.
LM4040AEM3-2.5+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:
- ±0.1%
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040AEM3-2.5+T FAQ
1.How can I place an order for LM4040AEM3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEM3-2.5+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 LM4040AEM3-2.5+T reliable?
The price and inventory of LM4040AEM3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEM3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040AEM3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEM3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEM3-2.5+T?
LM4040AEM3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEM3-2.5+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 LM4040AEM3-2.5+T?
For technical support, including LM4040AEM3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEM3-2.5+T requirements.
6.How does Aetrix verify that LM4040AEM3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040AEM3-2.5+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 LM4040AEM3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040AEM3-2.5+T?
All LM4040AEM3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEM3-2.5+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 LM4040AEM3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040AEM3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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