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Analog Devices Inc./Maxim Integrated LM4040CIX3-3.0+T
- Part No.:
- LM4040CIX3-3.0+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-3.0+T.pdf
- Description:
- IC VREF SHUNT 0.5% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,463
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Product details
Overview
LM4040CIX3-3.0+T from Maxim Integrated is a precision 3.000V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, 100ppm/°C max temperature coefficient, and stable operation from 60μA to 15mA shunt current. It delivers low 45µVRMS wideband noise (10Hz–10kHz) and requires no output capacitor, making it ideal for space-constrained battery-powered analog front-ends and ADC reference circuits.
For engineers reviewing the LM4040CIX3-3.0+T datasheet, LM4040CIX3-3.0+T pinout, LM4040CIX3-3.0+T application, or LM4040CIX3-3.0+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, ultra-small 1.8mm × 1.8mm footprint, low dynamic impedance (≤0.9Ω), and compatibility with capacitive loads without instability.
Technical Context
The LM4040CIX3-3.0+T uses a laser-trimmed bandgap core to maintain precise reverse breakdown voltage under varying load and temperature conditions. Its two-terminal architecture eliminates need for external biasing components, and internal pass transistor regulates by sinking variable shunt current across an external source resistor.
Unlike series references, it operates as a shunt device-requiring only a single series resistor between supply and cathode-and remains stable with any capacitive load due to inherent frequency compensation. The NC pin (Pin 3) must be left unconnected or tied to cathode (Pin 2), confirming strict two-terminal functional behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V nominal at +25°C; ±15mV (±0.5%) tolerance over full operating range |
| Initial Accuracy | ±0.5% (C-grade), enabling high-resolution 12-bit ADC reference without trimming |
| Tempco | ≤100ppm/°C, ensuring ≤±3.0mV drift over -40°C to +85°C ambient |
| Shunt Current Range | 60μA to 15mA, supporting micropower sensor nodes and higher-current analog subsystems |
| Dynamic Impedance | ≤0.9Ω at 1mA/120Hz, minimizing output voltage variation under load transients |
| Wideband Noise | 45µVRMS (10Hz–10kHz), suitable for precision instrumentation and low-noise data acquisition |
| Operating Temp Range | -40°C to +85°C, qualified for industrial and portable equipment environments |
Pinout & Package
Package: SC70-3 (1.8mm × 1.8mm surface-mount), RoHS-compliant, tape-and-reel delivery. Thermal resistance θJA = 340°C/W (four-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node and load return path |
| 2 (–) | Anode | Reference ground terminal; forms voltage reference point with Pin 1 |
| 3 (N.C.) | No Connection | Must remain unconnected or tied to Pin 2; no internal function or signal path |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 50% smaller than SOT23 equivalents-enables dense PCB layouts in wearables and IoT sensors |
| No output capacitor required | Guaranteed stability with any capacitive load up to 10µF, simplifying BOM and layout |
| Low micropower operation | 60μA minimum shunt current enables operation from coin-cell or energy-harvesting sources |
| Robust thermal performance | Rated for continuous operation at +85°C ambient with full 15mA shunt current capability |
| Laser-trimmed precision | Ensures tight initial tolerance without post-assembly calibration in production test flow |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Battery-powered ECG front-end with 16-bit SAR ADC requiring stable 3.0V reference. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precision VREF for ADC conversion and sensor excitation. Use Value: Enables <1 LSB error over temperature with no external capacitor, reducing component count and board area. |
Use Scenario: 4–20mA loop-powered transmitter with microcontroller and analog conditioning stage. IC Role / Device Role / Timing Role: Primary voltage reference for DAC output scaling and sensor signal conditioning. Use Value: Maintains ±0.5% accuracy across -40°C to +85°C, eliminating field recalibration in remote installations. |
| Automotive Cabin Control Modules | Smart Energy Meters |
|
Use Scenario: HVAC control unit with thermistor-based temperature sensing and display backlight regulation. IC Role / Device Role / Timing Role: Reference for analog-to-digital conversion of cabin temperature and humidity signals. Use Value: Delivers 45µVRMS noise floor compatible with high-resolution delta-sigma ADCs used in automotive comfort systems. |
Use Scenario: Revenue-grade electricity meter requiring metrology-grade voltage reference for polyphase measurement ICs. IC Role / Device Role / Timing Role: Stable 3.0V reference for metrology ADC and real-time clock power management circuitry. Use Value: Long-term stability of 120ppm over 1000 hours ensures compliance with IEC 62053-21 accuracy class requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C30IDBZR | 3.0V, ±0.5%, SC70-3, 100ppm/°C, but higher 75µVRMS noise and 70μA min shunt current | Less suitable for ultra-low-noise ADC reference; acceptable for general-purpose regulation | Select TL4050C30IDBZR only if lower cost outweighs 33% higher noise and tighter min current constraint |
| ADR3430ARJZ-R7 | 3.0V, ±0.1%, SOT23-3, 30ppm/°C, but series topology requiring external bypass cap and higher quiescent current | Requires PCB redesign for series configuration and decoupling; better for low-tempco critical apps | Choose ADR3430ARJZ-R7 only when <30ppm/°C tempco is mandatory and layout allows series reference topology |
Compared with TL4050C30IDBZR and ADR3430ARJZ-R7, the LM4040CIX3-3.0+T uniquely balances ultra-small SC70 size, capacitor-free operation, and C-grade precision-making it optimal for space- and power-constrained shunt reference designs where moderate tempco suffices.
Availability
LM4040CIX3-3.0+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and smart energy meters requiring stable component supply with consistent lead times and full traceability.
Supply support for LM4040CIX3-3.0+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, automotive, and communications markets, with emphasis on high-performance, low-power solutions.
The LM4040 product line delivers improved micropower shunt voltage references optimized for space-constrained, battery-operated systems needing stable, accurate, and capacitor-free voltage references across multiple fixed outputs.
FAQ
What is the maximum shunt current rating for LM4040CIX3-3.0+T?
The LM4040CIX3-3.0+T supports a continuous shunt current range of 60μA to 15mA. Absolute maximum reverse current is 20mA - exceeding this risks permanent damage. At 15mA and 3.0V, power dissipation reaches 45mW, well within the SC70 package's 235mW limit at +70°C ambient.
Can LM4040CIX3-3.0+T be used with large output capacitors?
Yes - the LM4040CIX3-3.0+T is explicitly designed to remain stable with any capacitive load, including ceramic, tantalum, or electrolytic capacitors up to at least 10µF. No external compensation or series resistance is needed, unlike many other shunt references.
Is Pin 3 of LM4040CIX3-3.0+T required to be connected?
No - Pin 3 is marked N.C. (No Connection) and must either be left floating or tied directly to Pin 2 (anode). It has no internal connection and serves no electrical function; incorrect connection to other nets may compromise performance or reliability.
What is the long-term stability specification for LM4040CIX3-3.0+T?
The LM4040CIX3-3.0+T exhibits 120ppm typical long-term stability after 1000 hours of operation at elevated temperature. This corresponds to approximately ±0.36mV drift at 3.000V output, supporting applications requiring minimal calibration over multi-year service life.
Does LM4040CIX3-3.0+T meet AEC-Q100 automotive qualification?
No - the LM4040CIX3-3.0+T is rated for -40°C to +85°C and is not AEC-Q100 qualified. For automotive applications, select variants with "/V" suffix (e.g., LM4040CIX3-3.0/V+T), which are explicitly qualified per AEC-Q100 Rev G and specified for -40°C to +125°C operation.
LM4040CIX3-3.0+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):
- 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+T FAQ
1.How can I place an order for LM4040CIX3-3.0+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-3.0+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 LM4040CIX3-3.0+T reliable?
The price and inventory of LM4040CIX3-3.0+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIX3-3.0+T is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-3.0+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-3.0+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-3.0+T?
LM4040CIX3-3.0+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-3.0+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 LM4040CIX3-3.0+T?
For technical support, including LM4040CIX3-3.0+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-3.0+T requirements.
6.How does Aetrix verify that LM4040CIX3-3.0+T is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-3.0+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 LM4040CIX3-3.0+T meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-3.0+T?
All LM4040CIX3-3.0+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-3.0+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 LM4040CIX3-3.0+T part is unused and in its original packaging.
Return procedure for LM4040CIX3-3.0+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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