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Analog Devices Inc./Maxim Integrated LM4040DEM3-2.5+T
- Part No.:
- LM4040DEM3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040DEM3-2.5+T.pdf
- Description:
- IC VREF SHUNT 2.5V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,235
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Product details
Overview
LM4040DEM3-2.5+T from Maxim Integrated is a precision 2.500V fixed-output shunt voltage reference in a 3-pin SC70 package, featuring ±1.0% initial accuracy, 150ppm/°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 1.1Ω dynamic impedance and 35μVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy analog sensing in automotive power management systems.
For engineers reviewing the LM4040DEM3-2.5+T datasheet, LM4040DEM3-2.5+T pinout, LM4040DEM3-2.5+T application, or LM4040DEM3-2.5+T equivalent, key selection criteria include its AEC-Q100-compliant extended temperature range, no-output-capacitor requirement, tolerance of capacitive loads, and compatibility with space-constrained PCB layouts requiring subminiature footprint.
Technical Context
The LM4040DEM3-2.5+T implements a laser-trimmed bandgap reference core with two-terminal shunt topology, operating as a precision zener-like device under reverse bias. Its output voltage remains stable without external stabilization components, even with arbitrary capacitive loading.
It is rated for continuous shunt currents from 60μA to 15mA, with guaranteed performance over full industrial and automotive temperature extremes (−40°C to +125°C), and exhibits low dynamic impedance (≤1.1Ω at 1mA) and low output noise (35μVRMS), enabling use in high-resolution ADC reference and precision current-sense feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±25mV (±1.0% initial accuracy at +25°C) |
| Tempco | 150ppm/°C max - ensures ≤±0.375V drift over −40°C to +125°C |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power and moderate-current regulation |
| Dynamic Impedance | ≤1.1Ω at 1mA - maintains tight voltage regulation under load transients |
| Wideband Noise | 35μVRMS (10Hz–10kHz) - suitable for 16-bit+ data acquisition systems |
| Operating Temp Range | −40°C to +125°C - qualified for under-hood automotive and industrial control |
| Package | SC70-3 (1.8mm × 1.8mm) - 50% smaller than SOT23, enables dense layout |
Pinout & Package
LM4040DEM3-2.5+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 be left unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Cathode Input | Reverse-bias terminal: connects to regulated node; sinks shunt current |
| 2 (−) | Cathode / Reference Ground | Reference return path; defines 0V reference point for output voltage |
| 3 (N.C.) | No Connection | Must remain floating or shorted to pin 2; no internal connection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70 footprint | 1.8mm × 1.8mm area saves >50% board space vs. SOT23 equivalents |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout sensitivity |
| AEC-Q100 qualified | Rated for automotive applications per Rev 12 datasheet (−40°C to +125°C) |
| Laser-trimmed accuracy | Guaranteed ±1.0% initial tolerance - reduces calibration overhead in production |
| Low micropower operation | 60μA minimum operating current enables battery-powered sensor nodes |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Analog Sensor Interface |
|---|---|
Use Scenario: Providing stable 2.5V reference for oxygen sensor signal conditioning and ADC conversion in engine air-fuel ratio monitoring. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise ground-referenced voltage for ratiometric measurement. Use Value: Enables <±0.5% total error over temperature, meeting ASIL-B functional safety margin requirements. | Use Scenario: Supplying reference voltage to 24-bit sigma-delta ADCs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for high-resolution data acquisition front-end. Use Value: 35μVRMS noise and 150ppm/°C tempco support 18-bit effective resolution across −40°C to +85°C ambient. |
| Portable Medical Glucose Monitor | Smart Energy Meter Reference |
Use Scenario: Biasing electrochemical sensor electrodes and setting ADC reference in handheld glucose meters powered by coin-cell batteries. IC Role / Device Role / Timing Role: Micropower shunt reference maintaining accuracy at 60–100μA operating current. Use Value: Ultra-low quiescent current extends battery life beyond 12 months while retaining ±1% absolute accuracy. | Use Scenario: Generating metrology-grade reference for polyphase energy meter ICs (e.g., ADE78xx) in Class 0.5 smart meters. IC Role / Device Role / Timing Role: Primary voltage reference for anti-tampering analog front-end and precision ADC subsystem. Use Value: Long-term stability of 120ppm over 1000 hours ensures compliance with IEC 62053-21 accuracy certification. |
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 (2.5V set via resistors); 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 | Requires external resistor network; less accurate at 2.5V but lower tempco | Select when adjustable output or tighter tempco outweighs fixed-voltage convenience and AEC-Q100 qualification |
| MAX6008AEUR+T | Fixed 2.5V; 0.2% initial accuracy; 50ppm/°C tempco; SOT23-3; −40°C to +85°C only | Narrower temperature range; higher accuracy but not automotive-qualified | Select for commercial-grade instrumentation where 0.2% accuracy and low tempco are critical, but extended temp range is unnecessary |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040DEM3-2.5+T offers unique value in automotive and industrial designs requiring guaranteed −40°C to +125°C operation, AEC-Q100 compliance, and zero external components - trading minor accuracy degradation for robustness and design simplicity.
Availability
LM4040DEM3-2.5+T is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC analog modules, portable medical devices, and smart energy metering systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM4040DEM3-2.5+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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The LM4040 product line delivers micropower, high-accuracy shunt references optimized for space-constrained, high-reliability applications where stability, low noise, and extended temperature operation are critical - especially in automotive and industrial sensing.
FAQ
What is the guaranteed initial accuracy of the LM4040DEM3-2.5+T at +25°C?
The LM4040DEM3-2.5+T has a guaranteed initial accuracy of ±1.0% at +25°C, corresponding to a 2.500V output tolerance of ±25mV (2.475V to 2.525V). This D-grade specification is confirmed in the Electrical Characteristics table for the 2.500V version and applies across the full −40°C to +125°C operating range per datasheet Note 2.
Does the LM4040DEM3-2.5+T require an external output capacitor for stability?
No, the LM4040DEM3-2.5+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference inputs or large bulk capacitance. This eliminates BOM cost, layout constraints, and potential phase-margin issues associated with capacitor selection - a key advantage confirmed in the General Description and Applications Information sections.
What is the maximum shunt current rating for the LM4040DEM3-2.5+T, and what happens above that limit?
The LM4040DEM3-2.5+T is rated for continuous shunt current up to 15mA. Absolute Maximum Ratings specify 20mA as the absolute reverse current limit. Exceeding 15mA risks exceeding the device's power dissipation limits (235mW at +70°C, derated above), potentially causing thermal runaway or accelerated long-term drift. Designers must size the series resistor (RS) to ensure ISHUNT stays within 60μA–15mA across all operating conditions.
Is the LM4040DEM3-2.5+T qualified for automotive applications?
Yes, the LM4040DEM3-2.5+T is AEC-Q100 qualified for automotive applications. The "E" suffix in the part number denotes the −40°C to +125°C temperature grade, and the Benefits and Features section explicitly states "AEC-Q100 Qualified." This qualification covers stress testing for temperature cycling, humidity, and mechanical shock - making it suitable for under-hood and body-control module deployments.
How does the LM4040DEM3-2.5+T differ from the SOT23-packaged LM4040DEM3-2.5+T variants?
The LM4040DEM3-2.5+T uses the SC70-3 package (1.8mm × 1.8mm), whereas the "M3" suffix in other variants (e.g., LM4040DEM3-2.5+T) refers to SOT23-3 (2.9mm × 1.6mm). Though both share identical electrical specs and temperature grading, the SC70 version reduces board area by ~50%, enabling denser layouts in portable and automotive modules where space is constrained - a distinction clearly documented in the Package Information and Ordering Information tables.
LM4040DEM3-2.5+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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040DEM3-2.5+T FAQ
1.How can I place an order for LM4040DEM3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEM3-2.5+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 LM4040DEM3-2.5+T reliable?
The price and inventory of LM4040DEM3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEM3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040DEM3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEM3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEM3-2.5+T?
LM4040DEM3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEM3-2.5+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 LM4040DEM3-2.5+T?
For technical support, including LM4040DEM3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEM3-2.5+T requirements.
6.How does Aetrix verify that LM4040DEM3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040DEM3-2.5+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 LM4040DEM3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040DEM3-2.5+T?
All LM4040DEM3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEM3-2.5+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 LM4040DEM3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040DEM3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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