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Analog Devices Inc./Maxim Integrated LM4040CIX3-5.0
- Part No.:
- LM4040CIX3-5.0
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-5.0.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,193
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Product details
Overview
LM4040CIX3-5.0 from Maxim Integrated is a precision 5.000V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +85°C, 54µA minimum operating current, and 80µVRMS wideband noise (10Hz–10kHz). It delivers stable regulation for ADC/DAC biasing, portable power monitoring, and battery management circuits.
For engineers reviewing the LM4040CIX3-5.0 datasheet, LM4040CIX3-5.0 pinout, LM4040CIX3-5.0 application, or LM4040CIX3-5.0 equivalent, this page provides verified electrical parameters, validated SC70-3 terminal mapping, confirmed shunt-current-dependent voltage stability behavior, and real-world use cases in space-constrained, low-power systems.
Technical Context
The LM4040CIX3-5.0 uses a bandgap-based shunt architecture to maintain a fixed 5.000V reverse breakdown voltage across its terminals when biased with 54µA to 15mA cathode-to-anode current. Its BiCMOS process enables low dynamic impedance (0.5–1.1Ω) and eliminates need for external stabilization capacitors.
It operates without forward conduction concerns below 10mA anode-to-cathode current and tolerates any capacitive load while maintaining stability. Temperature drift is bounded by ±15ppm/°C over –40°C to +85°C, with total overtemperature tolerance of ±1.15% for the C-grade variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V nominal at +25°C; guaranteed 4.975V to 5.025V for C-grade at room temperature |
| Initial Accuracy | ±0.5% (C-grade); ensures ≤25mV absolute error at +25°C for precision analog sensing |
| Tempco | ±15ppm/°C max; contributes ≤±0.975mV/°C drift over full –40°C to +85°C range |
| Min Operating Current | 54µA; defines lowest shunt current enabling regulation without dropout |
| Dynamic Impedance | 0.5–1.1Ω at 1mA; maintains <12mV output shift under 10mA load transients |
| Noise (10Hz–10kHz) | 80µVRMS; supports high-resolution 16-bit+ ADC reference applications |
| Long-Term Stability | 120ppm over 1000h; predicts <0.06% output drift after one year of continuous operation |
Pinout & Package
LM4040CIX3-5.0 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3. Pin 3 is unconnected (N.C.) and must be left floating or tied to Pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connects to system ground or low-impedance return path; forms cathode-to-anode bias loop |
| 2 (−) | Cathode / Negative Terminal | Carries regulated 5.000V output; sinks shunt current from external source resistor |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2; no internal circuitry attached |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in ultra-dense PCB layouts for wearables and IoT sensors |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk from external COUT |
| Wide shunt current range | 54µA to 15mA operation supports both micropower sleep modes and high-accuracy active measurement phases |
| Low 80µVRMS noise | Enables direct use as reference for 16-bit SAR ADCs without additional filtering or buffering |
| Laser-trimmed accuracy | Ensures ±0.5% initial tolerance without post-assembly calibration in production test flow |
Applications
| Portable Power Monitoring | Battery Management Systems |
|---|---|
Use Scenario: Real-time voltage tracking of single-cell Li-ion batteries in Bluetooth earbuds and smartwatches. IC Role / Device Role / Timing Role: Shunt reference providing stable 5.000V基准 for ADC input scaling during charge/discharge cycles. Use Value: Enables ±10mV battery voltage resolution at 3.0–4.2V range using 12-bit internal ADC, meeting USB-IF power reporting requirements. | Use Scenario: Cell-balancing controller in 2S lithium-polymer packs for drones and power tools. IC Role / Device Role / Timing Role: Precision 5.000V reference for differential voltage comparators monitoring individual cell voltages. Use Value: Supports ±5mV cell-voltage matching accuracy, reducing pack imbalance and extending cycle life by ≥15%. |
| Industrial Sensor Signal Conditioning | Medical Wearable Analog Front-End |
Use Scenario: Bridge sensor excitation and signal chain biasing in handheld pressure transmitters. IC Role / Device Role / Timing Role: Stable 5.000V shunt reference powering Wheatstone bridge and setting PGA gain reference. Use Value: Maintains <0.05% full-scale linearity over –25°C to +70°C ambient, eliminating thermal zero-shift calibration. | Use Scenario: ECG front-end in FDA-cleared patch monitors requiring low-noise, low-power analog conditioning. IC Role / Device Role / Timing Role: Low-noise 5.000V reference for 16-bit delta-sigma ADC converting amplified biopotential signals. Use Value: Delivers 80µVRMS noise floor compatible with 100nV-level ECG signal integrity, meeting IEC 60601-2-47 SNR targets. |
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 | 5.0V output, ±0.5% accuracy, SOIC-3 package (2.92mm × 1.6mm), 75µA min current, 40µVRMS noise | Larger footprint; lower noise but higher min current limits micropower use below 75µA | Select when board space allows SOIC and lower noise is prioritized over ultra-low quiescent current |
| ADR3450ARJZ-R7 | 5.0V output, ±0.1% accuracy, SOT23-3 package, 120µA min current, 10µVRMS noise, requires 1µF output capacitor | Higher accuracy and lower noise, but needs external capacitor and draws more quiescent current | Select when highest initial accuracy and lowest noise are critical, and capacitor placement is acceptable |
Compared with TL4050C50IDBZR and ADR3450ARJZ-R7, LM4040CIX3-5.0 offers the smallest PCB footprint (SC70), lowest minimum operating current (54µA), and capacitor-free operation-making it optimal for space- and power-constrained designs where ±0.5% accuracy suffices.
Availability
LM4040CIX3-5.0 is available at Aetrix Electronics and suitable for portable power monitoring, battery management systems, industrial sensor signal conditioning, and medical wearable analog front-end designs requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4040CIX3-5.0 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 low-power, high-accuracy solutions.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems requiring stable, low-drift reference voltages without external compensation components.
FAQ
What is the minimum shunt current required for LM4040CIX3-5.0 to regulate properly?
The LM4040CIX3-5.0 requires a minimum shunt current of 54µA to maintain regulation across its full temperature range (–40°C to +85°C). Below this threshold, output voltage deviates from the specified 5.000V nominal value. This value is confirmed in the Electrical Characteristics table for LM4040_I_3-5.0 under "Minimum Operating Current" for the C-grade variant.
Can LM4040CIX3-5.0 be used with large output capacitance, such as 10µF ceramic?
Yes, LM4040CIX3-5.0 is explicitly designed to remain stable with any capacitive load, including 10µF ceramic capacitors. The datasheet states "No Output Capacitors Required" and "Tolerates Capacitive Loads" as key features, and stability is guaranteed regardless of output capacitance value or ESR-eliminating need for series resistance or damping networks.
What is the maximum allowable shunt current for LM4040CIX3-5.0 without risking damage?
The absolute maximum reverse current for LM4040CIX3-5.0 is 20mA, as specified in the Absolute Maximum Ratings table. Continuous operation above this level may cause permanent damage. For reliable long-term regulation, shunt current should be kept within 54µA to 15mA-the functional operating range defined in the Electrical Characteristics section.
How does the temperature coefficient affect LM4040CIX3-5.0 output voltage over its operating range?
The LM4040CIX3-5.0 has a guaranteed temperature coefficient of ±15ppm/°C. Over the full –40°C to +85°C range (ΔT = 125°C), this contributes up to ±1.875mV drift (±15ppm/°C × 125°C × 5.000V). Combined with ±0.5% initial error (±25mV), total worst-case deviation remains within ±26.875mV of 5.000V across temperature and unit variation.
Is LM4040CIX3-5.0 pin-compatible with other LM4040 variants in SC70-3 package?
Yes, all LM4040 SC70-3 variants-including LM4040CIX3-2.1, LM4040CIX3-2.5, LM4040CIX3-3.0, LM4040CIX3-4.1, and LM4040CIX3-5.0-share identical pinout (Pin 1=+, Pin 2=−, Pin 3=N.C.) and SC70-3 mechanical dimensions. This allows direct substitution between voltage options without PCB layout changes, provided the system's voltage tolerance and accuracy requirements are met.
LM4040CIX3-5.0 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):
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040CIX3-5.0 FAQ
1.How can I place an order for LM4040CIX3-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-5.0 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 LM4040CIX3-5.0 reliable?
The price and inventory of LM4040CIX3-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIX3-5.0 is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-5.0?
LM4040CIX3-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-5.0 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 LM4040CIX3-5.0?
For technical support, including LM4040CIX3-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-5.0 requirements.
6.How does Aetrix verify that LM4040CIX3-5.0 is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-5.0 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 LM4040CIX3-5.0 meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-5.0?
All LM4040CIX3-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-5.0, 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 LM4040CIX3-5.0 part is unused and in its original packaging.
Return procedure for LM4040CIX3-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIX3-5.0 Tags
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