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Analog Devices Inc./Maxim Integrated LM4040DEM3-2.1-T
- Part No.:
- LM4040DEM3-2.1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040DEM3-2.1-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
LM4040DEM3-2.1-T from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring 1.0% initial accuracy, ±150ppm/°C temperature coefficient, -40°C to +125°C operating range, and 60μA–15mA shunt current capability. It serves as a stable reference in portable battery-powered systems where space and thermal stability are critical.
For engineers reviewing the LM4040DEM3-2.1-T datasheet, LM4040DEM3-2.1-T pinout, LM4040DEM3-2.1-T application, or LM4040DEM3-2.1-T equivalent, key selection criteria include guaranteed extended-temperature operation, no-output-capacitor stability, low dynamic impedance (≤1.1Ω), wideband noise (28µVRMS), and compatibility with capacitive loads in compact SC70 footprint.
Technical Context
The LM4040DEM3-2.1-T implements a laser-trimmed bandgap architecture to deliver fixed 2.048V reverse breakdown voltage with tight tolerance over industrial and automotive temperature extremes. Its two-terminal topology eliminates external biasing complexity while maintaining regulation across 60μA–15mA shunt current.
Unlike series references, it operates as a shunt device-sinking excess current through an external resistor to maintain precise cathode-to-anode voltage. Stability is ensured without output capacitance, even under varying load conditions and up to 15mA current swing, supported by low 1.1Ω dynamic impedance at 1mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±20mV (±1.0%) initial tolerance at +25°C ensures predictable system-level calibration margin |
| Temperature Coefficient | ±150ppm/°C max; guarantees ≤±0.15% voltage drift over full -40°C to +125°C range for high-reliability applications |
| Operating Current Range | 60μA to 15mA; enables ultra-low-power sensing and high-current reference buffering in same design |
| Dynamic Impedance | ≤1.1Ω at 1mA; minimizes output voltage perturbation during transient load changes |
| Wideband Noise | 28µVRMS (10Hz–10kHz); supports precision ADC/DAC reference without added filtering |
| Long-Term Stability | 120ppm after 1000h; ensures minimal calibration drift in deployed instrumentation |
Pinout & Package
LM4040DEM3-2.1-T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is NC and must be left unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-side reference node; forms cathode-to-anode voltage path |
| 2 (–) | Cathode (negative terminal) | Reference output node; voltage measured between pin 2 and pin 1 |
| 3 (N.C.) | No connection | Must remain floating or shorted to pin 2; no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves PCB real estate in space-constrained portable designs |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk |
| Extended temperature range | -40°C to +125°C operation supports under-hood automotive and industrial control environments |
| Low quiescent current capability | Stable regulation down to 60μA enables micropower sensor interfaces and battery longevity |
Applications
| Portable Medical Sensors | Notebook Computer Power Management |
|---|---|
Use Scenario: Reference for analog front-end of wearable ECG/SpO₂ sensors operating on coin-cell batteries. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 2.048V for 12-bit ADC conversion. Use Value: 60μA minimum operating current extends battery life; ±150ppm/°C TC ensures clinical-grade accuracy across body-temperature variations. | Use Scenario: Voltage reference for VRM feedback loop and battery fuel-gauge IC in ultrabook platforms. IC Role / Device Role / Timing Role: Precision shunt reference sourcing stable 2.048V for power-rail monitoring circuitry. Use Value: SC70 size fits dense motherboard layouts; no-output-capacitor stability simplifies layout and avoids resonance issues with VRM decoupling caps. |
| Industrial Process Transmitters | Automotive Cabin Control Modules |
Use Scenario: 4–20mA loop transmitter in factory automation requiring long-term calibration stability. IC Role / Device Role / Timing Role: Primary voltage reference for DAC-based current-loop driver with HART modulation. Use Value: 120ppm long-term drift over 1000h reduces field recalibration frequency; -40°C to +125°C rating covers harsh plant-floor environments. | Use Scenario: Reference for HVAC control microcontroller ADC measuring cabin temperature and humidity sensors. IC Role / Device Role / Timing Role: Shunt reference supplying 2.048V to MCU's internal ADC reference input. Use Value: Extended temperature grade meets AEC-Q200 ambient requirements; 15mA shunt capability supports robust startup under cold-cranking conditions. |
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 reference (1.24V–6V), 0.5% initial accuracy, SOT23-5, requires external resistors for 2.048V setting | Not pin-compatible; needs external divider; higher quiescent current (80μA min) | Select when adjustable output or tighter accuracy at 2.5V is needed; not drop-in for LM4040DEM3-2.1-T |
| MAX6008AEUR+T | 2.048V fixed reference, 0.1% accuracy, SC70-3, ±50ppm/°C TC, -40°C to +125°C | Higher accuracy and lower TC but higher cost; identical package and pinout | Choose for metrology-grade stability where 0.1% initial error and ±50ppm/°C TC justify premium |
Compared with TLV431ACDBVR and MAX6008AEUR+T, LM4040DEM3-2.1-T offers lowest cost and simplest implementation for 2.048V reference in SC70, trading accuracy and TC for economy and ease-of-use-ideal for cost-sensitive industrial and consumer applications where ±1.0% and ±150ppm/°C meet system requirements.
Availability
LM4040DEM3-2.1-T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power management, and industrial process transmitters requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040DEM3-2.1-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 is a semiconductor company specializing in analog and mixed-signal ICs for power, interface, sensing, and timing applications.
The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, battery-operated, and high-temperature industrial systems requiring stable, low-drift reference voltages without external components.
FAQ
What is the exact output voltage and tolerance of LM4040DEM3-2.1-T?
The LM4040DEM3-2.1-T provides a nominal reverse breakdown voltage of 2.048V with ±1.0% initial accuracy (±20.5mV) at +25°C. Over the full -40°C to +125°C temperature range, total tolerance expands to ±1.98% due to its ±150ppm/°C temperature coefficient, making it suitable for applications where moderate precision suffices under thermal stress.
Does LM4040DEM3-2.1-T require an external output capacitor?
No, LM4040DEM3-2.1-T does not require an external output capacitor for stability. It is designed to remain stable with any capacitive load-including zero capacitance-eliminating layout constraints and reducing BOM count. This behavior is verified across its full 60μA–15mA operating current range and -40°C to +125°C temperature span.
What is the minimum operating current for reliable regulation of LM4040DEM3-2.1-T?
The LM4040DEM3-2.1-T requires a minimum shunt current of 60μA to maintain regulation. Below this threshold, output voltage deviates significantly from specification. The datasheet specifies IRMIN = 70μA maximum for the D-grade variant at -40°C to +125°C, ensuring robust startup and low-temperature operation in battery-powered systems.
Can LM4040DEM3-2.1-T be used in automotive under-hood applications?
Yes, LM4040DEM3-2.1-T is rated for -40°C to +125°C operation and qualified for industrial and extended-temperature applications. While not AEC-Q200 certified out-of-box, its guaranteed performance across this range makes it suitable for non-safety-critical cabin and engine-bay subsystems-such as HVAC sensors or infotainment power monitoring-when validated per customer qualification protocols.
What is the purpose of pin 3 (N.C.) on LM4040DEM3-2.1-T?
Pin 3 on LM4040DEM3-2.1-T is designated N.C. (no connection) and has no internal bond wire or function. Per Maxim's datasheet, it must either remain unconnected or be tied directly to pin 2 (cathode). Leaving it floating or connecting it elsewhere may cause unpredictable behavior or violate package reliability specifications.
LM4040DEM3-2.1-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040DEM3-2.1-T FAQ
1.How can I place an order for LM4040DEM3-2.1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEM3-2.1-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 LM4040DEM3-2.1-T reliable?
The price and inventory of LM4040DEM3-2.1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEM3-2.1-T is usually 5 days.
3.What payment methods are accepted for LM4040DEM3-2.1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEM3-2.1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEM3-2.1-T?
LM4040DEM3-2.1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEM3-2.1-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 LM4040DEM3-2.1-T?
For technical support, including LM4040DEM3-2.1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEM3-2.1-T requirements.
6.How does Aetrix verify that LM4040DEM3-2.1-T is sourced from the original manufacturer or authorized distributors?
All LM4040DEM3-2.1-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 LM4040DEM3-2.1-T meets industry standards.
7.What is the process for return or replacement of LM4040DEM3-2.1-T?
All LM4040DEM3-2.1-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEM3-2.1-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 LM4040DEM3-2.1-T part is unused and in its original packaging.
Return procedure for LM4040DEM3-2.1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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