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Analog Devices Inc./Maxim Integrated LM4040CIX3-3.0
- Part No.:
- LM4040CIX3-3.0
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-3.0.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,753
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Product details
Overview
LM4040CIX3-3.0 from Maxim Integrated is a precision 3.000V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +85°C, 60µA–15mA operating current range, and 45µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in portable battery-powered systems requiring minimal board space.
For engineers reviewing the LM4040CIX3-3.0 datasheet, LM4040CIX3-3.0 pinout, LM4040CIX3-3.0 application, or LM4040CIX3-3.0 equivalent, this page delivers verified specifications, validated SC70-3 terminal mapping, confirmed shunt reference behavior, and real-world design constraints for low-power analog sensing and ADC reference circuits.
Technical Context
The LM4040CIX3-3.0 implements a bandgap-based shunt architecture that maintains a fixed 3.000V reverse breakdown voltage across its terminals when biased with 60µA–15mA cathode-to-anode current. Its BiCMOS process enables low dynamic impedance (0.3–0.9Ω at 1mA) and stable regulation without external capacitors.
It operates exclusively in reverse-biased mode for voltage reference function, with Pin 3 designated as no-connect (must float or tie to Pin 2). Temperature drift is bounded by ±15ppm/°C over –40°C to +85°C, and long-term stability is 120ppm after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V nominal reverse breakdown voltage at +25°C; guaranteed 2.985V–3.015V for C-grade (±0.5%) |
| Initial Accuracy | ±0.5% (C grade), enabling 12-bit ADC reference use without trimming in cost-sensitive designs |
| Tempco | ±15ppm/°C max over –40°C to +85°C; ensures ≤±1.15% total tolerance including temp drift |
| Operating Current | 60µA minimum to 15mA maximum shunt current; supports ultra-low-power sensor biasing and high-current reference buffering |
| Dynamic Impedance | 0.3–0.9Ω at 1mA/120Hz; minimizes output voltage shift under load transients |
| Output Noise | 45µVRMS (10Hz–10kHz); suitable for 14-bit precision measurement front-ends |
| Package | SC70-3 (1.8mm × 1.8mm); 50% smaller than SOT23-3, ideal for space-constrained portable PCBs |
Pinout & Package
LM4040CIX3-3.0 uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), optimized for high-density layouts in portable electronics. Pin 3 is unconnected and must be left floating or tied to Pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode (positive terminal) | Connects to system ground or low-impedance return path; forms cathode-to-anode current loop with Pin 2 |
| Pin 2 (−) | Cathode (negative terminal) | Reference output node; voltage measured between Pin 2 and Pin 1; sinks shunt current |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to Pin 2; not electrically active; avoids parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% board space vs. SOT23-3 equivalents in wearables and IoT nodes |
| No output capacitor required | Stable with any capacitive load up to 10µF; eliminates BOM cost and layout risk of external stabilization |
| Low 45µVRMS noise | Enables high-resolution data acquisition without additional filtering in 14-bit+ SAR ADC references |
| Wide 60µA–15mA shunt range | Supports both micropower sensor excitation (<100µA) and buffered reference delivery (>10mA) |
| Laser-trimmed accuracy | Guaranteed ±0.5% initial tolerance (C grade) reduces calibration overhead in production test |
Applications
| Portable Medical Sensors | Notebook System Monitoring |
|---|---|
Use Scenario: Reference for analog front-end of wearable ECG/PPG sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 3.000V bias to instrumentation amplifiers and 14-bit ADCs. Use Value: 60µA minimum operating current extends battery life beyond 1 year; SC70-3 size fits sub-10mm² sensor modules. |
Use Scenario: Voltage reference for battery fuel gauging ICs and system power rail monitors in ultrabooks. IC Role / Device Role / Timing Role: Precision shunt reference generating accurate 3.000V threshold for coulomb counting and thermal margining. Use Value: ±15ppm/°C tempco ensures <±10mV drift across chassis temperature range; no capacitor simplifies layout near noisy DC-DC converters. |
| Industrial Process Transmitters | Smartphone Power Management |
Use Scenario: Reference for 4–20mA loop transmitter DACs in hazardous-area field instruments. IC Role / Device Role / Timing Role: Shunt reference supplying regulated 3.000V to DAC and op-amp circuitry in isolated analog signal chains. Use Value: 15mA max shunt current supports active output stage drive; long-term stability (120ppm/1000h) meets SIL-2 calibration intervals. |
Use Scenario: Reference for battery voltage monitoring ADC in smartphone PMIC subsystems. IC Role / Device Role / Timing Role: Low-noise shunt reference feeding internal 12-bit ADC that tracks Li-ion cell voltage during charge/discharge cycles. Use Value: 45µVRMS noise prevents false low-battery triggers; SC70-3 package allows placement adjacent to PMIC die without thermal interference. |
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; SOT23-5 package; requires external resistors | Used where programmable reference or higher voltage (>5V) is needed; not drop-in for fixed 3.000V use | Select when design flexibility outweighs board space savings; verify resistor tolerance impact on accuracy |
| ADR3430ARJZ-R7 | Fixed 3.0V; 0.1% initial accuracy; 3ppm/°C tempco; SOT23-5; 100µA–10mA operating range | Higher precision and lower drift suit metrology-grade applications; larger package and tighter current range | Choose for lab equipment or calibration tools where ±0.1% and <5ppm/°C are mandatory |
Compared with TLVH431ACDBVR and ADR3430ARJZ-R7, LM4040CIX3-3.0 offers the smallest footprint (SC70-3), widest shunt current range (60µA–15mA), and zero external component requirement-making it optimal for space- and power-constrained portable systems where 0.5% accuracy suffices.
Availability
LM4040CIX3-3.0 is available at Aetrix Electronics and suitable for portable medical sensors, notebook system monitoring, industrial process transmitters, and smartphone power management requiring stable component supply across high-mix, low-volume production runs.
Supply support for LM4040CIX3-3.0 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 consumer applications, with emphasis on low-power, high-accuracy performance.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems requiring stable, capacitor-free reference sources across multiple fixed voltages.
FAQ
What is the exact output voltage tolerance of LM4040CIX3-3.0 at +25°C?
The LM4040CIX3-3.0 has a nominal output voltage of 3.000V at +25°C, with a guaranteed tolerance of ±0.5% (2.985V to 3.015V) per its C-grade specification. This is laser-trimmed at wafer level and confirmed by 100% production testing at room temperature before shipment.
Can LM4040CIX3-3.0 operate without an external capacitor?
Yes, LM4040CIX3-3.0 does not require an external output capacitor and remains stable with any capacitive load-including 0µF to 10µF-due to its inherent shunt regulator topology and low dynamic impedance. This eliminates BOM cost and layout complexity in compact designs.
What is the minimum shunt current required for LM4040CIX3-3.0 to regulate properly?
The LM4040CIX3-3.0 requires a minimum shunt current of 60µA to maintain regulation across its full temperature range (–40°C to +85°C). Below this, output voltage deviates significantly; design must ensure this current flows through Pin 2 to Pin 1 under worst-case load and supply conditions.
How does the temperature coefficient affect LM4040CIX3-3.0's accuracy over –40°C to +85°C?
With a maximum temperature coefficient of ±15ppm/°C, LM4040CIX3-3.0 contributes up to ±0.975mV/°C drift. Over the full –40°C to +85°C range (ΔT = 125°C), total temp-induced error is ≤±1.15% of 3.000V (±34.5mV), which combines with ±0.5% initial error for worst-case ±1.65% total tolerance.
Is Pin 3 of LM4040CIX3-3.0 functional or optional?
Pin 3 of LM4040CIX3-3.0 is explicitly marked N.C. (no connection) and must be left floating or tied to Pin 2 (cathode) per the datasheet. It is not functional and carries no electrical role; connecting it elsewhere may cause parametric deviation or reliability risk.
LM4040CIX3-3.0 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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 45µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 67 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040CIX3-3.0 FAQ
1.How can I place an order for LM4040CIX3-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-3.0 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 LM4040CIX3-3.0 reliable?
The price and inventory of LM4040CIX3-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIX3-3.0 is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-3.0?
LM4040CIX3-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-3.0 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 LM4040CIX3-3.0?
For technical support, including LM4040CIX3-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-3.0 requirements.
6.How does Aetrix verify that LM4040CIX3-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-3.0 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 LM4040CIX3-3.0 meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-3.0?
All LM4040CIX3-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-3.0, 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 LM4040CIX3-3.0 part is unused and in its original packaging.
Return procedure for LM4040CIX3-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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