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Analog Devices Inc./Maxim Integrated LM4040CIX3-2.1
- Part No.:
- LM4040CIX3-2.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-2.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,020
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Product details
Overview
LM4040CIX3-2.1 from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, ±15 ppm/°C temperature coefficient over –40°C to +85°C, 60µA–15mA operating current range, and 28µVRMS wideband noise (10Hz–10kHz). It delivers stable reference voltage for ADC/DAC biasing, portable power monitoring, and battery fuel gauging circuits.
For engineers reviewing the LM4040CIX3-2.1 datasheet, LM4040CIX3-2.1 pinout, LM4040CIX3-2.1 application, or LM4040CIX3-2.1 equivalent, this page provides verified specifications, SC70-3 terminal mapping, real-world use scenarios, and validated alternative options for space-constrained, low-power analog reference designs.
Technical Context
The LM4040CIX3-2.1 implements a bandgap-based shunt architecture with laser-trimmed resistors for precise 2.048V reverse breakdown voltage. Its BiCMOS process enables stable regulation without external capacitors across any load capacitance.
It operates as a two-terminal device: cathode (Pin 1) and anode (Pin 2), with Pin 3 designated N.C. (must be left floating or tied to Pin 2). The device maintains regulation over 60µA–15mA shunt current while exhibiting low dynamic impedance (≤0.9Ω at 1mA) and minimal voltage drift (±10 mV max over full temperature range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±0.5% initial tolerance (±10.24 mV) at +25°C - ensures accurate scaling for 12-bit ADC references. |
| Temperature Coefficient | ±15 ppm/°C max over –40°C to +85°C - contributes ≤±1.0 mV total drift across operating range. |
| Operating Current Range | 60µA to 15mA - supports micropower sensor nodes and higher-current reference buffering without external components. |
| Dynamic Impedance | ≤0.9Ω at 1mA, 120Hz - minimizes output voltage perturbation during load transients. |
| Wideband Noise | 28µVRMS (10Hz–10kHz) - suitable for high-resolution data acquisition systems requiring low-noise references. |
| Long-Term Stability | 120ppm after 1000 hours - ensures consistent calibration integrity in field-deployed instrumentation. |
| Package | SC70-3 (1.8mm × 1.8mm) - reduces PCB area by 50% vs. SOT23-3, enabling ultra-compact portable designs. |
Pinout & Package
LM4040CIX3-2.1 uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm footprint, 0.95mm height). Pin 3 is unconnected and must remain floating or be tied to Pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node (e.g., ADC REF+ input). |
| Pin 2 (−) | Anode | Reference ground return path; forms shunt current loop with external series resistor. |
| Pin 3 (N.C.) | No Connection | Must be left unconnected or shorted to Pin 2; no internal circuitry attached. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint - enables placement in tight spaces such as wearable sensor modules and compact battery management ICs. |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout complexity for decoupling caps in space-limited applications. |
| Low 28µVRMS noise | 10Hz–10kHz integrated bandwidth - preserves signal integrity in 16-bit+ SAR and delta-sigma ADC reference paths. |
| Wide 60µA–15mA shunt current range | Supports both micropower sleep modes (<100µA) and active regulation under varying load conditions without redesign. |
| Laser-trimmed initial accuracy | ±0.5% (LM4040C grade) - reduces system-level calibration overhead in factory programming and field calibration workflows. |
Applications
| Portable Battery Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Real-time Li-ion cell voltage measurement in handheld medical devices with 12-bit ADCs. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC full-scale range, enabling ±1mV measurement resolution. Use Value: Eliminates need for external trimming or calibration due to ±0.5% initial accuracy and <±1.0mV tempco drift. |
Use Scenario: Precision bridge sensor excitation and ratiometric readout in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Supplies low-noise, thermally stable reference to instrumentation amplifier and ADC reference inputs. Use Value: 28µVRMS noise and ±15 ppm/°C tempco maintain <0.01% FS error across –40°C to +85°C ambient. |
| USB-Powered Data Loggers | Energy Metering Reference Subsystem |
Use Scenario: Low-quiescent-current voltage reference for 16-bit sigma-delta ADCs in battery-backed USB-C data loggers. IC Role / Device Role / Timing Role: Shunt reference biased at 100µA to minimize system standby power while maintaining regulation. Use Value: Stable operation down to 60µA enables >1-year battery life in always-on logging mode. |
Use Scenario: High-accuracy reference for polyphase energy meter SoCs requiring metrology-grade voltage scaling. IC Role / Device Role / Timing Role: Delivers 2.048V reference to metrology ADCs and internal DACs in AFE subsystems. Use Value: 120ppm long-term stability ensures calibration validity over 10-year product lifetime without field recalibration. |
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 | Adjustable 1.24V–6V output; 0.5% initial accuracy; SOT23-5 package; requires external resistors for 2.048V setting. | Higher design flexibility but adds two precision resistors and layout area; less optimal for fixed-voltage, space-critical use. | Select TLV431ACDBVR only when programmability or multi-voltage support is required; not drop-in for LM4040CIX3-2.1. |
| MAX6008AEUR+T | Fixed 2.048V output; 0.2% initial accuracy; SC70-3 package; 35µVRMS noise; 50ppm/°C tempco. | Better initial accuracy but higher noise and worse tempco; suited for moderate-precision, lower-cost applications. | Choose MAX6008AEUR+T where tighter initial tolerance justifies trade-offs in thermal drift and noise performance. |
Compared with TLV431ACDBVR and MAX6008AEUR+T, LM4040CIX3-2.1 offers the best balance of ultra-small SC70-3 size, low 28µVRMS noise, and predictable ±15 ppm/°C thermal behavior - making it optimal for high-resolution, space-constrained analog front-ends where fixed 2.048V is required.
Availability
LM4040CIX3-2.1 is available at Aetrix Electronics and suitable for portable battery monitoring, industrial sensor conditioning, USB-powered data loggers, and energy metering reference subsystems requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040CIX3-2.1 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 applications, with emphasis on high-performance, low-power solutions.
The LM4040 family was developed specifically for space-constrained, micropower shunt reference applications demanding high initial accuracy, low noise, and capacitor-free stability - targeting portable instrumentation, sensor interfaces, and battery management systems.
FAQ
What is the exact output voltage tolerance of LM4040CIX3-2.1 at +25°C?
The LM4040CIX3-2.1 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 specification is guaranteed for the LM4040C grade and confirmed in the Electrical Characteristics table for LM4040_I_3-2.1 under TA = +25°C conditions.
Does LM4040CIX3-2.1 require an external output capacitor for stability?
No, LM4040CIX3-2.1 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 ceramic bypass caps. This eliminates capacitor-related BOM cost and layout constraints in compact designs.
What is the minimum operating current for LM4040CIX3-2.1?
The minimum operating current for LM4040CIX3-2.1 is 60µA, as specified in the Electrical Characteristics table. Regulation is maintained down to this current level across the full –40°C to +85°C temperature range, enabling ultra-low-power operation in battery-backed systems.
How is Pin 3 used on LM4040CIX3-2.1?
Pin 3 of LM4040CIX3-2.1 is labeled N.C. (No Connection) and must be left floating or connected directly to Pin 2 (anode). It has no internal connection and tying it elsewhere may compromise device reliability or regulation performance per the official datasheet guidance.
What is the wideband noise performance of LM4040CIX3-2.1?
LM4040CIX3-2.1 delivers 28µVRMS wideband noise over the 10Hz to 10kHz frequency range at 100µA operating current. This low-noise characteristic supports high-resolution data conversion in 16-bit ADC applications without requiring additional filtering stages.
LM4040CIX3-2.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- 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:
- ±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 FAQ
1.How can I place an order for LM4040CIX3-2.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-2.1 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 reliable?
The price and inventory of LM4040CIX3-2.1 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 is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-2.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-2.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-2.1?
LM4040CIX3-2.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-2.1 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?
For technical support, including LM4040CIX3-2.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-2.1 requirements.
6.How does Aetrix verify that LM4040CIX3-2.1 is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-2.1 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 meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-2.1?
All LM4040CIX3-2.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-2.1, 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 part is unused and in its original packaging.
Return procedure for LM4040CIX3-2.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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