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Analog Devices Inc./Maxim Integrated LM4040CEM3-2.1+T
- Part No.:
- LM4040CEM3-2.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CEM3-2.1+T.pdf
- Description:
- IC VREF SHUNT 2.048V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
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Product details
Overview
LM4040CEM3-2.1+T from Maxim Integrated is a precision 2.048V 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 voltage with 60μA–15mA shunt current capability and low 28μVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy ADC/DAC biasing and portable battery-powered instrumentation.
For engineers reviewing the LM4040CEM3-2.1+T datasheet, LM4040CEM3-2.1+T pinout, LM4040CEM3-2.1+T application, or LM4040CEM3-2.1+T equivalent, key selection criteria include its AEC-Q100-qualified extended temperature range, no-output-capacitor stability, ultra-small 1.8mm × 1.8mm footprint, and compatibility with capacitive loads in space-constrained industrial and automotive sensor signal chains.
Technical Context
The LM4040CEM3-2.1+T implements a laser-trimmed bandgap core to achieve precise 2.048V reverse breakdown voltage with minimal drift. Its two-terminal architecture eliminates external feedback components, simplifying design while maintaining regulation across 60μA–15mA shunt current and –40°C to +125°C ambient.
Dynamic impedance remains ≤0.9Ω at 1mA (120Hz), ensuring tight output voltage stability under load transients. The device tolerates any output capacitance without oscillation and exhibits 120ppm long-term stability after 1000 hours-critical for calibration-critical systems requiring field reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±10mV (±0.5%) initial tolerance at +25°C ensures accurate system-level voltage scaling without post-calibration. |
| Temperature Coefficient | ≤100ppm/°C over –40°C to +125°C; guarantees <±20mV total drift across full operating range for robust thermal performance. |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power sensor nodes (e.g., 60μA sleep mode) and higher-current analog front-ends without external buffering. |
| Dynamic Impedance | ≤0.9Ω at 1mA/120Hz; minimizes output voltage variation during load steps, enabling stable reference for 16-bit+ data converters. |
| Wideband Noise | 28μVRMS (10Hz–10kHz); low enough to avoid degrading SNR in precision measurement circuits like weigh scales or medical sensors. |
| Long-Term Stability | 120ppm after 1000h; ensures reference accuracy retention over product lifetime without recalibration in industrial control modules. |
| Package | SC70-3 (1.8mm × 1.8mm); 50% smaller than SOT23, enabling dense PCB layouts in handheld test equipment and wearable health monitors. |
Pinout & Package
SC70-3 surface-mount package (1.8mm × 1.8mm, 0.95mm height), RoHS-compliant, tape-and-reel delivery. Pin 3 is NC (no connection) and must be left unconnected or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (cathode-side terminal in shunt configuration) | Connected to system ground or low-impedance return path; forms reference node with pin 2. |
| 2 (–) | Cathode (reference output terminal) | Provides stable 2.048V relative to pin 1; sinks shunt current to maintain regulation. |
| 3 (N.C.) | No connection | Must remain floating or shorted to pin 2; not internally bonded-leaving it open avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% board space vs. SOT23, critical for miniaturized IoT edge nodes and compact medical patches. |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk associated with external compensation networks. |
| AEC-Q100 qualified (Grade 1) | Validated for automotive applications up to +125°C ambient, supporting engine control unit (ECU) sensor references and ADAS power management. |
| Low 28μVRMS noise | Enables direct use in high-resolution (≥16-bit) SAR and delta-sigma ADCs without additional filtering, reducing component count. |
| 100ppm/°C tempco | Ensures predictable, bounded error across industrial temperature ranges-eliminates need for software temperature compensation in PLC I/O modules. |
Applications
| Portable Instrumentation | Battery-Powered Sensors |
|---|---|
|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring stable 2.048V reference for 12–16-bit ADCs and DACs. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precision bias voltage for analog signal conditioning and digitization. Use Value: Enables single-supply operation with rail-to-rail input amplifiers while maintaining ±0.5% absolute accuracy across battery discharge cycles. |
Use Scenario: Wireless environmental sensors (temperature/humidity/pressure) powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent-current shunt reference establishing ADC reference voltage in ultra-low-power wake-up modes. Use Value: 60μA minimum operating current allows continuous sensing at <1μA average system current, extending battery life to >5 years. |
| Automotive Sensor Interfaces | Industrial Process Controllers |
|
Use Scenario: Engine coolant temperature and exhaust gas oxygen sensors interfacing to automotive microcontrollers. IC Role / Device Role / Timing Role: AEC-Q100 qualified shunt reference supplying stable excitation voltage for ratiometric sensor bridges. Use Value: Guaranteed –40°C to +125°C operation ensures accuracy retention across extreme under-hood thermal cycling without derating. |
Use Scenario: Modular PLC analog input modules measuring 4–20mA current loops and thermocouple signals. IC Role / Device Role / Timing Role: Precision voltage reference for isolated sigma-delta ADCs performing high-accuracy process variable digitization. Use Value: 120ppm long-term stability prevents calibration drift over 10+ year deployments in factory automation systems. |
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; 100ppm/°C tempco; SOT23-3 package. | Requires two external resistors for 2.048V setting; higher minimum cathode current (80μA) limits ultra-low-power use. | Select when adjustable output or higher voltage capability is needed; verify resistor tolerance impact on final accuracy. |
| REF3020AIDBZR | 2.048V series reference; 0.2% initial accuracy; 50ppm/°C tempco; SOT23-3; requires 35μA supply current. | Three-terminal architecture needs dedicated supply rail; cannot sink current like shunt devices-requires different topology. | Choose for lower tempco and tighter initial accuracy where board space permits series reference layout and extra supply routing. |
Compared with TLVH431ACDBVR and REF3020AIDBZR, the LM4040CEM3-2.1+T offers the smallest footprint and simplest two-terminal interface for fixed 2.048V shunt regulation, but trades off adjustability and ultra-low tempco-making it optimal for space-constrained, cost-sensitive, and thermally demanding applications where 0.5% accuracy suffices.
Availability
LM4040CEM3-2.1+T is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and automotive sensor interfaces requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LM4040CEM3-2.1+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 designs high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and consumer markets, emphasizing precision, power efficiency, and integration.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, high-accuracy applications including portable test equipment, automotive sensors, and industrial process control systems.
FAQ
What is the exact output voltage tolerance of the LM4040CEM3-2.1+T at +25°C?
The LM4040CEM3-2.1+T has a nominal output voltage of 2.048V with ±0.5% initial accuracy at +25°C, corresponding to a tolerance range of 2.038V to 2.058V. This is confirmed in the Electrical Characteristics table for the C-grade (0.5%) variant under "Reverse Breakdown Voltage" at TA = +25°C.
Does the LM4040CEM3-2.1+T require an external output capacitor for stability?
No, the LM4040CEM3-2.1+T does not require an external output capacitor and is guaranteed stable with any capacitive load. This eliminates layout constraints and BOM cost associated with compensation networks-confirmed in both the General Description and Applications Information sections of the datasheet.
What is the maximum operating temperature range supported by the LM4040CEM3-2.1+T?
The LM4040CEM3-2.1+T is rated for operation from –40°C to +125°C, as indicated by the "E" suffix in the part number (LM4040E_xxx). This extended temperature grade is validated per AEC-Q100 and specified in the Ordering Information table and Absolute Maximum Ratings section.
How does the LM4040CEM3-2.1+T behave under varying shunt current conditions?
The LM4040CEM3-2.1+T maintains stable output voltage across a 60μA to 15mA shunt current range. Voltage change is ≤1.0mV for IRMIN ≤ IR ≤ 1mA and ≤8.0mV for 1mA ≤ IR ≤ 15mA-values documented in the Electrical Characteristics table for the C-grade 2.048V variant.
What is the purpose of Pin 3 (N.C.) on the LM4040CEM3-2.1+T SC70-3 package?
Pin 3 on the LM4040CEM3-2.1+T is designated N.C. (no connection) and must either be left unconnected or tied to Pin 2 (cathode) per the Pin Configuration diagram and Pin Description section. It is not internally bonded, and connecting it elsewhere may cause unpredictable behavior or damage.
LM4040CEM3-2.1+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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- 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
LM4040CEM3-2.1+T FAQ
1.How can I place an order for LM4040CEM3-2.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEM3-2.1+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 LM4040CEM3-2.1+T reliable?
The price and inventory of LM4040CEM3-2.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEM3-2.1+T is usually 5 days.
3.What payment methods are accepted for LM4040CEM3-2.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEM3-2.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEM3-2.1+T?
LM4040CEM3-2.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEM3-2.1+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 LM4040CEM3-2.1+T?
For technical support, including LM4040CEM3-2.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEM3-2.1+T requirements.
6.How does Aetrix verify that LM4040CEM3-2.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040CEM3-2.1+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 LM4040CEM3-2.1+T meets industry standards.
7.What is the process for return or replacement of LM4040CEM3-2.1+T?
All LM4040CEM3-2.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEM3-2.1+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 LM4040CEM3-2.1+T part is unused and in its original packaging.
Return procedure for LM4040CEM3-2.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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