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Analog Devices Inc./Maxim Integrated LM4040CEM3-5.0+T
- Part No.:
- LM4040CEM3-5.0+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CEM3-5.0+T.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,842
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Product details
Overview
LM4040CEM3-5.0+T from Maxim Integrated is a precision 5.000V, two-terminal shunt voltage reference in SC70-3 package with ±0.5% 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 for analog-to-digital converter (ADC) reference, portable power monitoring, and industrial sensor signal conditioning.
For engineers reviewing the LM4040CEM3-5.0+T datasheet, LM4040CEM3-5.0+T pinout, LM4040CEM3-5.0+T application, or LM4040CEM3-5.0+T equivalent, key selection criteria include shunt current range, thermal stability over automotive temperature extremes, low 80µVRMS wideband noise, and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4040CEM3-5.0+T uses bandgap-based shunt architecture to maintain a fixed 5.000V reverse breakdown voltage under reverse bias. Its laser-trimmed internal resistors ensure ±0.5% initial accuracy at +25°C, and its temperature coefficient is bounded at ±100ppm/°C over –40°C to +125°C.
It operates as a two-terminal device requiring only an external series resistor to set shunt current. With no output capacitor needed and full stability into any capacitive load, it simplifies layout in space-constrained applications while maintaining low dynamic impedance (≤1.1Ω at 1mA) and 120ppm long-term stability after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V nominal; ±25mV tolerance at +25°C (C-grade), enabling accurate ADC reference for 12-bit systems. |
| Initial Accuracy | ±0.5% (C grade); ensures ≤25mV absolute error at room temperature without calibration. |
| Temp Coefficient | ±100ppm/°C max; contributes ≤±12.5mV drift over –40°C to +125°C, critical for automotive and industrial environments. |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power sensor biasing and high-current reference buffering in single-supply systems. |
| Wideband Noise | 80µVRMS (10Hz–10kHz); low enough to avoid degrading 14-bit ADC performance in precision measurement circuits. |
| Dynamic Impedance | ≤1.1Ω at 1mA; maintains tight regulation despite load transients up to 2.5mA step changes. |
| Long-Term Stability | 120ppm (1000h); guarantees <0.012% output drift over one year of continuous operation. |
Pinout & Package
LM4040CEM3-5.0+T is housed in a RoHS-compliant 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is NC and must be left unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (cathode-side terminal) | Connects to system ground or low-impedance return path; serves as reference output node in shunt configuration. |
| 2 (–) | Cathode (anode-side terminal) | Connects to positive supply via series resistor; reverse current flows cathode-to-anode to establish regulated voltage. |
| 3 (N.C.) | No connection | Must remain floating or shorted to pin 2; no internal function-omitting connection avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in dense portable PCB layouts where SOT23 is prohibitive. |
| No external capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk associated with output filtering. |
| Extended temperature range | –40°C to +125°C operation supports under-hood automotive, industrial control, and outdoor IoT deployments. |
| AEC-Q100 qualified option available | LM4040CEM3-5.0/V+T variant meets automotive reliability standards; this part shares identical electrical specs and SC70 package. |
| Low micropower operation | 60μA minimum operating current allows use in battery-powered devices with multi-year standby life. |
Applications
| Portable Power Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Monitoring Li-ion battery voltage in handheld medical instruments with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 5.000V reference for ADC conversion, rejecting supply ripple and temperature-induced drift. Use Value: Enables ±0.5% end-to-end voltage measurement accuracy over –20°C to +60°C ambient, meeting IEC 60601-1 requirements. | Use Scenario: Biasing 4–20mA current-loop pressure transmitters in factory automation PLC modules. IC Role / Device Role / Timing Role: Supplies precise excitation voltage to bridge sensors and sets reference for current DAC output stage. Use Value: Maintains <±0.1% full-scale error across –40°C to +85°C, eliminating need for per-unit calibration in production. |
| Automotive Cabin Control | High-Resolution Data Acquisition |
Use Scenario: Reference source for HVAC microcontroller ADC measuring cabin temperature and humidity sensors. IC Role / Device Role / Timing Role: Delivers stable 5.000V reference under cold-crank (5.5V) and load-dump (28V) conditions with minimal external components. Use Value: Survives 125°C junction temperature with derated shunt current, satisfying AEC-Q100 Grade 1 thermal requirements. | Use Scenario: Precision reference for 16-bit delta-sigma ADC in portable test equipment measuring thermocouple outputs. IC Role / Device Role / Timing Role: Low-noise (80µVRMS), low-drift reference minimizes quantization uncertainty and improves effective number of bits (ENOB). Use Value: Achieves >14.5 ENOB over 0–70°C, exceeding specification for Class I portable instrumentation per IEC 61000-4-30. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C50IDBZR | Same 5.0V output, ±0.5% accuracy, but SOT23-3 package and 150ppm/°C tempco (vs. 100ppm/°C). | Higher drift limits use in extended-temp industrial designs; lower thermal resistance suits higher ambient environments. | Select when board space allows SOT23 and thermal budget permits ±18.75mV max drift over –40°C to +125°C. |
| REF3050AIDBZR | 5.0V series reference (not shunt); requires 35µA supply current, 100ppm/°C tempco, but higher 50mA output drive capability. | Cannot replace shunt topology directly; needs redesign for series configuration and load regulation support. | Choose only if system requires active output drive or low quiescent current with series architecture-not drop-in replacement. |
Compared with TL4050C50IDBZR, LM4040CEM3-5.0+T offers tighter thermal stability for automotive and industrial applications; compared with REF3050AIDBZR, it retains the simplicity of two-terminal shunt operation but lacks sourcing capability-making it ideal for passive reference nodes with fixed current sources.
Availability
LM4040CEM3-5.0+T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, automotive cabin controllers, and high-resolution data acquisition systems requiring stable component supply across extended temperature ranges.
Supply support for LM4040CEM3-5.0+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 industrial, automotive, and communications markets with emphasis on reliability and integration.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, wide-temperature applications where passive two-terminal operation and capacitive-load immunity are essential.
FAQ
What is the maximum shunt current rating for LM4040CEM3-5.0+T?
The LM4040CEM3-5.0+T supports a continuous shunt current range of 60μA to 15mA. Absolute maximum reverse current is 20mA - exceeding this risks permanent damage. At 15mA and 5.0V, power dissipation reaches 75mW; thermal design must ensure junction temperature stays ≤+150°C, especially above +70°C ambient.
Does LM4040CEM3-5.0+T require an external output capacitor for stability?
No, LM4040CEM3-5.0+T does not require an external output capacitor. It is internally compensated and remains stable with any capacitive load, including 0μF to >10μF. This eliminates capacitor-related BOM cost, footprint, and potential resonance issues in compact PCB layouts.
What is the temperature coefficient specification for LM4040CEM3-5.0+T?
The LM4040CEM3-5.0+T has a maximum average temperature coefficient of ±100ppm/°C over –40°C to +125°C. At 5.000V output, this corresponds to ±12.5mV total drift across the full range - verified by design and guaranteed for C-grade parts per the datasheet's overtemperature tolerance calculation.
Can LM4040CEM3-5.0+T be used in automotive applications?
Yes - LM4040CEM3-5.0+T operates from –40°C to +125°C and is offered in AEC-Q100 qualified variants (e.g., LM4040CEM3-5.0/V+T). While this specific part number is not marked /V, it shares identical electrical specs, SC70 package, and thermal performance - making it suitable for non-safety-critical automotive cabin systems with proper system-level qualification.
How is pin 3 used on LM4040CEM3-5.0+T?
Pin 3 of LM4040CEM3-5.0+T is designated N.C. (no connection). It must be left unconnected or tied directly to pin 2 (cathode). Connecting pin 3 to any other node may introduce leakage paths or instability; the internal connection is open, and no functionality is assigned to this terminal.
LM4040CEM3-5.0+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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CEM3-5.0+T FAQ
1.How can I place an order for LM4040CEM3-5.0+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEM3-5.0+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 LM4040CEM3-5.0+T reliable?
The price and inventory of LM4040CEM3-5.0+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEM3-5.0+T is usually 5 days.
3.What payment methods are accepted for LM4040CEM3-5.0+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEM3-5.0+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEM3-5.0+T?
LM4040CEM3-5.0+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEM3-5.0+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 LM4040CEM3-5.0+T?
For technical support, including LM4040CEM3-5.0+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEM3-5.0+T requirements.
6.How does Aetrix verify that LM4040CEM3-5.0+T is sourced from the original manufacturer or authorized distributors?
All LM4040CEM3-5.0+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 LM4040CEM3-5.0+T meets industry standards.
7.What is the process for return or replacement of LM4040CEM3-5.0+T?
All LM4040CEM3-5.0+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEM3-5.0+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 LM4040CEM3-5.0+T part is unused and in its original packaging.
Return procedure for LM4040CEM3-5.0+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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