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Analog Devices Inc./Maxim Integrated LM4040AEM3-2.5
- Part No.:
- LM4040AEM3-2.5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AEM3-2.5.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,583
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Product details
Overview
LM4040AEM3-2.5 from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference with 0.1% initial accuracy, ±15ppm/°C temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse breakdown voltage across 60µA–15mA shunt current and is used in high-accuracy analog signal chains, ADC/DAC biasing, and battery-powered instrumentation.
For engineers reviewing the LM4040AEM3-2.5 datasheet, LM4040AEM3-2.5 pinout, LM4040AEM3-2.5 application, or LM4040AEM3-2.5 equivalent, key selection criteria include its SC70-3 package footprint, no-output-capacitor requirement, low 35µVRMS wideband noise (10Hz–10kHz), and compatibility with capacitive loads in space-constrained industrial and portable designs.
Technical Context
The LM4040AEM3-2.5 implements a bandgap-based shunt reference architecture, functioning as a precision two-terminal device that maintains a fixed 2.500V reverse breakdown voltage when biased with 60µA–15mA cathode-to-anode current. Its laser-trimmed internal resistors ensure 0.1% initial accuracy at +25°C, and it exhibits ±15ppm/°C max temperature coefficient over –40°C to +125°C.
No external stabilization capacitor is required-the device achieves inherent stability across all output capacitance values. Its dynamic impedance is ≤0.8Ω at 1mA (120Hz), and long-term stability is 120ppm after 1000 hours, supporting reliable performance in embedded sensing and calibration systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±2.5mV (0.1% initial accuracy at +25°C) |
| Temp Coefficient | ±15ppm/°C max-ensures ≤±19mV total drift over –40°C to +125°C |
| Shunt Current Range | 60µA to 15mA-supports low-power sensor biasing and high-current regulation |
| Dynamic Impedance | ≤0.8Ω at 1mA-minimizes voltage shift under load transients |
| Wideband Noise | 35µVRMS (10Hz–10kHz)-critical for high-resolution data acquisition |
| Operating Temp | –40°C to +125°C-qualified for extended industrial and automotive under-hood use |
| Long-Term Stability | 120ppm after 1000h-reduces recalibration frequency in field-deployed equipment |
Pinout & Package
LM4040AEM3-2.5 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than comparable SOT23 devices. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Cathode | Positive terminal; connects to regulated voltage node requiring precise 2.500V reference |
| Pin 2 (–) | Anode | Negative terminal; connects to system ground or return path for shunt current |
| Pin 3 (N.C.) | No Connection | Must remain unconnected or shorted to pin 2-no internal function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint enables placement in dense PCB layouts for portable and wearable electronics |
| 0.1% initial accuracy | Eliminates need for post-production trimming in precision measurement front-ends |
| No output capacitor required | Reduces BOM count and layout area while maintaining stability with any capacitive load |
| Low 35µVRMS noise | Supports 16-bit+ ADC resolution without additional filtering in data loggers and sensor nodes |
| –40°C to +125°C operation | Enables use in harsh environments including motor control feedback loops and industrial PLC I/O modules |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld multimeter measuring DC voltage with 0.1% full-scale accuracy. IC Role / Device Role / Timing Role: Provides 2.500V reference for 24-bit sigma-delta ADC and analog front-end gain calibration. Use Value: Enables factory-calibrated accuracy without user trim pots, leveraging 0.1% initial tolerance and ±15ppm/°C drift control. | Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 seconds on coin-cell power. IC Role / Device Role / Timing Role: Supplies stable 2.500V bias to low-power op-amps and ADCs during intermittent wake cycles. Use Value: 60µA minimum operating current allows continuous regulation even at ultra-low quiescent power budgets. |
| Industrial Process Transmitters | Automotive Cabin Sensors |
Use Scenario: 4–20mA loop-powered pressure transmitter operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: References DAC output driving current loop amplifier; withstands capacitive cable loads up to 10nF. Use Value: Tolerates direct connection to long twisted-pair cables without oscillation-no external capacitor needed. | Use Scenario: Occupancy sensor module mounted near HVAC ducts inside vehicle cabin (–40°C to +125°C). IC Role / Device Role / Timing Role: Supplies 2.500V reference to MEMS accelerometer and microcontroller ADC subsystem. Use Value: Extended temperature grade (E suffix) ensures specification compliance across full automotive cabin thermal range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | 2.5V adjustable shunt reference; 0.5% initial accuracy; 50ppm/°C tempco; SOT23-3 package | Requires external resistor divider for 2.5V setting; higher drift limits use in high-precision metrology | Select when cost sensitivity outweighs accuracy requirements and board space permits minor layout adjustment |
| REF3025AIDBZR | 2.5V series reference; 0.2% initial accuracy; 50ppm/°C tempco; 65µA quiescent current; SOT23-3 | Series topology requires input headroom; not a drop-in replacement for shunt configurations | Choose only if system design allows series reference topology and supply margin >2.75V |
Compared with TLV431ACDBVR and REF3025AIDBZR, LM4040AEM3-2.5 offers superior initial accuracy (0.1% vs. 0.5%/0.2%), lower tempco (±15ppm/°C vs. 50ppm/°C), and true shunt operation enabling direct replacement of zener diodes without topology change-critical for retrofitting legacy analog circuits.
Availability
LM4040AEM3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process transmitters, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040AEM3-2.5 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 demanding industrial, medical, and communications applications.
LM4040AEM3-2.5 belongs to the LM4040 family of micropower shunt voltage references engineered for high-accuracy, low-drift, and capacitor-free operation in space-constrained and thermally aggressive environments.
FAQ
What is the guaranteed operating temperature range for LM4040AEM3-2.5?
The LM4040AEM3-2.5 is specified for continuous operation from –40°C to +125°C. This extended temperature grade (denoted by the "E" suffix) is validated per Maxim's production test flow and supports applications such as under-hood automotive sensors and industrial motor drives where ambient temperatures exceed +85°C.
Does LM4040AEM3-2.5 require an external output capacitor for stability?
No, LM4040AEM3-2.5 does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load-including long PCB traces or cable capacitance-eliminating the need for added components and simplifying layout in compact systems.
What is the minimum shunt current needed for LM4040AEM3-2.5 to maintain regulation?
The LM4040AEM3-2.5 requires a minimum shunt current of 60µA to maintain regulation at 2.500V. Below this threshold, output voltage deviates from specification; design must ensure this current flows through pin 1 (cathode) to pin 2 (anode) under all operating conditions, including lowest supply voltage and highest load current.
How does the 0.1% initial accuracy of LM4040AEM3-2.5 translate to absolute voltage tolerance at +25°C?
At +25°C, LM4040AEM3-2.5 guarantees a reverse breakdown voltage between 2.4975V and 2.5025V-±2.5mV around the nominal 2.500V. This tight tolerance eliminates post-manufacturing calibration in applications like portable test equipment and medical sensor front-ends.
Can LM4040AEM3-2.5 be used in place of a standard Zener diode?
Yes, LM4040AEM3-2.5 functions as a precision, low-noise, low-tempco replacement for 2.5V Zener diodes. Unlike general-purpose Zeners, it provides guaranteed 0.1% accuracy, ±15ppm/°C drift, and stable operation down to 60µA-making it suitable for upgrading legacy analog circuits without changing topology.
LM4040AEM3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for LM4040AEM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEM3-2.5 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 reliable?
The price and inventory of LM4040AEM3-2.5 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 is usually 5 days.
3.What payment methods are accepted for LM4040AEM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEM3-2.5?
LM4040AEM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEM3-2.5 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?
For technical support, including LM4040AEM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEM3-2.5 requirements.
6.How does Aetrix verify that LM4040AEM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040AEM3-2.5 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 meets industry standards.
7.What is the process for return or replacement of LM4040AEM3-2.5?
All LM4040AEM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEM3-2.5, 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 part is unused and in its original packaging.
Return procedure for LM4040AEM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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