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Analog Devices Inc./Maxim Integrated LM4040CIX3-2.1+T
- Part No.:
- LM4040CIX3-2.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-2.1+T.pdf
- Description:
- IC VREF SHUNT 2.048V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:3,657
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Product details
Overview
LM4040CIX3-2.1+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, 60μA–15mA operating current range, and guaranteed operation from –40°C to +85°C. It serves as a stable bandgap reference in space-constrained analog signal chains and power monitoring circuits.
For engineers reviewing the LM4040CIX3-2.1+T datasheet, LM4040CIX3-2.1+T pinout, LM4040CIX3-2.1+T application, or LM4040CIX3-2.1+T equivalent, key selection criteria include reverse breakdown voltage tolerance over temperature, dynamic impedance at low shunt currents, noise performance in 10Hz–10kHz bandwidth, and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4040CIX3-2.1+T implements a laser-trimmed bandgap core with no external capacitor required for stability. Its shunt architecture sinks current to maintain a fixed 2.048V reverse breakdown voltage across cathode–anode terminals, enabling use in high-side sensing and adjustable regulator feedback paths.
It operates across 60μA to 15mA shunt current with low 0.9Ω typical dynamic impedance (at 1mA), 28μVRMS wideband noise (10Hz–10kHz), and long-term stability of 120ppm after 1000 hours - all specified for the C-grade (±0.5%) variant in SC70-3 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal reverse breakdown voltage; tight tolerance enables accurate ADC/DAC reference and sensor excitation. |
| Initial Accuracy | ±0.5% (C-grade); ensures ≤±10.2mV error at +25°C for calibration-critical systems. |
| Temp Coefficient | ≤100ppm/°C; contributes ≤±6.5mV drift over –40°C to +85°C ambient range. |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power battery operation and high-current regulation loops. |
| Dynamic Impedance | 0.3Ω to 0.9Ω (1mA, 120Hz); maintains voltage stability under load transients and ripple. |
| Wideband Noise | 28μVRMS (10Hz–10kHz); minimizes added uncertainty in precision measurement front-ends. |
| Operating Temp Range | –40°C to +85°C; qualified for industrial and portable equipment environments. |
Pinout & Package
SC70-3 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3; RoHS-compliant, tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-side reference node; forms cathode-to-anode reverse bias path. |
| 2 (–) | Cathode (negative terminal) | Output node where regulated 2.048V appears; sinks shunt current from supply via series resistor. |
| 3 (N.C.) | No connection | Must remain unconnected or tied to pin 2; not internally bonded - floating connection avoids parasitic leakage. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves PCB space in wearables and compact IoT nodes. |
| No output capacitor required | Internally compensated for stability with any capacitive load - eliminates BOM cost and layout risk. |
| Low 28μVRMS noise | Enables <16-bit effective resolution in precision data acquisition without external filtering. |
| 60μA minimum operating current | Supports micropower designs with standby current budgets below 100μA. |
| 120ppm long-term stability | Ensures reference drift remains within ±0.25mV over 1000 hours - critical for unattended instrumentation. |
Applications
| Portable Medical Sensors | Notebook System Monitoring |
|---|---|
Use Scenario: Battery-powered ECG front-end with 24-bit sigma-delta ADC requiring stable excitation and reference. IC Role / Device Role / Timing Role: Shunt reference providing 2.048V reference for ADC and sensor biasing network. Use Value: ±0.5% accuracy and 28μVRMS noise enable sub-μV input-referred noise floor and calibrated amplitude linearity. |
Use Scenario: Real-time voltage margining and rail health monitoring on CPU/GPU VRM outputs. IC Role / Device Role / Timing Role: Precision shunt reference feeding comparator inputs for overvoltage/undervoltage detection. Use Value: 100ppm/°C tempco ensures trip thresholds remain stable across chassis temperature gradients (0°C–70°C). |
| Industrial Process Transmitters | Automotive Body Control Modules |
Use Scenario: 4–20mA loop-powered pressure transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise 2.048V基准 for DAC and current-sense amplifier gain setting. Use Value: 60μA–15mA operating range allows full functionality across 3.3V–24V loop supply while maintaining regulation. |
Use Scenario: Low-power window controller module monitoring 12V battery voltage and interior lighting rail integrity. IC Role / Device Role / Timing Role: Stable reference for microcontroller ADC measuring supply rails under cold-crank (6V) and load-dump (18V) conditions. Use Value: Guaranteed operation to –40°C and +85°C meets automotive ambient requirements without derating. |
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 reference; 0.5% initial accuracy; higher 120ppm/°C tempco; SOT23-3 package. | Requires two external resistors for 2.048V setting; less stable over temperature than LM4040CIX3-2.1+T. | Choose when design flexibility across multiple voltages is needed; avoid if fixed 2.048V and minimal component count are priorities. |
| MAX6008AEUR+T | Fixed 2.048V; 0.2% initial accuracy; 50ppm/°C tempco; SC70-3 package; higher 1.5mA min current. | Higher accuracy and lower tempco, but incompatible with ultra-low-power (<100μA) applications due to minimum current requirement. | Choose for metrology-grade stability where 0.2% accuracy and 50ppm/°C are mandatory; reject if 60μA operation is required. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040CIX3-2.1+T uniquely balances fixed 2.048V output, SC70-3 size, 60μA minimum current, and industrial-grade tempco - making it optimal for space- and power-constrained embedded systems needing guaranteed 0.5% accuracy without trimming or adjustment.
Availability
LM4040CIX3-2.1+T is available at Aetrix Electronics and suitable for portable medical sensors, notebook system monitoring, industrial process transmitters, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for LM4040CIX3-2.1+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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, computing, and communications markets, with emphasis on low-power, high-accuracy performance.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and industrial systems requiring stable, fixed-output references without external compensation.
FAQ
What is the exact reverse breakdown voltage of LM4040CIX3-2.1+T at +25°C?
The LM4040CIX3-2.1+T has a nominal reverse breakdown voltage of 2.048V at +25°C, with a guaranteed range of 2.038V to 2.058V (±0.5% initial accuracy). This value is laser-trimmed and specified in the Electrical Characteristics table for the C-grade variant under IR = 100μA condition.
Does LM4040CIX3-2.1+T require an external output capacitor for stability?
No, the LM4040CIX3-2.1+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 op-amp feedback networks - eliminating layout sensitivity and reducing BOM count.
What is the minimum shunt current needed for regulation in LM4040CIX3-2.1+T?
The LM4040CIX3-2.1+T requires a minimum shunt current of 65μA (max) to maintain regulation across its full temperature range (–40°C to +85°C). At +25°C, the typical minimum is 45μA, but designs must ensure ≥65μA under worst-case conditions.
Can LM4040CIX3-2.1+T be used in automotive applications?
The LM4040CIX3-2.1+T is rated for –40°C to +85°C operation and is not AEC-Q100 qualified. For automotive under-hood or infotainment applications requiring extended temperature range (–40°C to +125°C) and qualification, consider the LM4040CEX3-2.1+T or LM4040CEX3-2.1/V+T variants instead.
How does the 3rd pin (N.C.) of LM4040CIX3-2.1+T affect PCB layout?
Pin 3 of the LM4040CIX3-2.1+T is a no-connect terminal and must either remain unconnected or be tied directly to pin 2 (cathode). Leaving it floating or connecting it to other nets may introduce leakage paths or parasitic coupling that degrades reference accuracy and long-term stability.
LM4040CIX3-2.1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040CIX3-2.1+T FAQ
1.How can I place an order for LM4040CIX3-2.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-2.1+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 LM4040CIX3-2.1+T reliable?
The price and inventory of LM4040CIX3-2.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIX3-2.1+T is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-2.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-2.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-2.1+T?
LM4040CIX3-2.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-2.1+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 LM4040CIX3-2.1+T?
For technical support, including LM4040CIX3-2.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-2.1+T requirements.
6.How does Aetrix verify that LM4040CIX3-2.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-2.1+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 LM4040CIX3-2.1+T meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-2.1+T?
All LM4040CIX3-2.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-2.1+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 LM4040CIX3-2.1+T part is unused and in its original packaging.
Return procedure for LM4040CIX3-2.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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