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Analog Devices Inc./Maxim Integrated LM4040DIX3-2.5
- Part No.:
- LM4040DIX3-2.5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DIX3-2.5.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,002
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Product details
Overview
LM4040DIX3-2.5 from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring ±1.0% initial accuracy, ±150ppm/°C temperature coefficient, 60µA–15mA operating current range, 35µVRMS wideband noise (10Hz–10kHz), and stable operation without output capacitance-used for ADC/DAC biasing and portable power monitoring.
For engineers reviewing the LM4040DIX3-2.5 datasheet, LM4040DIX3-2.5 pinout, LM4040DIX3-2.5 application, or LM4040DIX3-2.5 equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in battery-powered systems, and confirmed alternative options for precision analog reference design.
Technical Context
The LM4040DIX3-2.5 implements a bandgap-based shunt reference architecture with laser-trimmed resistors to achieve fixed 2.500V reverse breakdown voltage. Its BiCMOS process enables low dynamic impedance (≤1.1Ω at 1mA) and stable regulation across -40°C to +85°C.
It operates as a two-terminal device requiring only a series resistor for biasing, tolerates any capacitive load without external compensation, and maintains output stability under load transients up to ±2.5mA with <36µs response time-enabling direct integration into space-constrained analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V nominal; guaranteed 2.250V–2.750V over full temperature range for D-grade accuracy. |
| Initial Accuracy | ±1.0% (±25mV); defines maximum deviation at +25°C before temperature or aging effects. |
| Tempco | ±150ppm/°C max; contributes ≤±9.75mV drift over -40°C to +85°C (ΔT = 125°C). |
| Operating Current | 60µA to 15mA; supports micropower sensor nodes and higher-current data converters simultaneously. |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures minimal output voltage shift under fast load changes. |
| Wideband Noise | 35µVRMS (10Hz–10kHz); suitable for 12-bit to 14-bit precision measurement circuits. |
| Long-Term Stability | 120ppm after 1000 hours; predicts <0.012% output drift over first year of operation. |
Pinout & Package
LM4040DIX3-2.5 uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3. Pin 3 is no-connect 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-side reference node; forms cathode-to-anode reverse bias path. |
| Pin 2 (−) | Cathode / Negative terminal | Connects to regulated voltage node; sinks shunt current to maintain 2.500V across terminals. |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to Pin 2; not internally bonded-floating avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in dense portable PCB layouts where SOT23-3 is prohibitive. |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk from external COUT. |
| Low 35µVRMS noise | Enables high-resolution analog signal chains without additional filtering or post-regulation stages. |
| 60µA minimum operating current | Supports ultra-low-power wake-up circuits and energy-harvesting applications with microamp bias budgets. |
| 150ppm/°C tempco (D grade) | Provides predictable, bounded drift for industrial control loops operating across extended ambient ranges. |
Applications
| Battery Voltage Monitoring | Portable ADC Reference |
|---|---|
Use Scenario: Real-time Li-ion cell voltage sampling in wearables using a 12-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.500V reference for ADC VREF input. Use Value: Enables ±0.5% battery state-of-charge accuracy despite 3.0V–4.2V supply variation and -10°C–60°C operating range. | Use Scenario: Precision thermistor readout in handheld medical sensors powered by coin cells. IC Role / Device Role / Timing Role: Two-terminal voltage reference establishing known excitation and scaling for ratiometric measurements. Use Value: Delivers 14-bit effective resolution with <35µVRMS noise, eliminating need for external low-noise op-amp buffering. |
| Industrial Sensor Signal Conditioning | USB-Powered Instrumentation |
Use Scenario: 4–20mA loop transmitter with integrated temperature compensation in factory automation modules. IC Role / Device Role / Timing Role: Stable 2.500V reference for DAC output scaling and analog front-end gain calibration. Use Value: Maintains <±0.2% full-scale error over -40°C to +85°C due to guaranteed 150ppm/°C tempco and laser-trimmed accuracy. | Use Scenario: Low-cost USB oscilloscope dongle requiring clean analog reference from 5V USB bus. IC Role / Device Role / Timing Role: Shunt regulator deriving 2.500V reference directly from USB 5V rail via series resistor. Use Value: Eliminates LDO stage and associated quiescent current, enabling <100µA sleep-mode draw while retaining 12-bit measurement fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C25IDBZR | 2.5V, ±0.5% initial accuracy, ±50ppm/°C tempco, SOT23-3 package, 75µA–15mA operating range. | Higher accuracy and lower tempco; requires minimum 75µA current vs. LM4040DIX3-2.5's 60µA. | Select when tighter long-term stability and lower drift are prioritized over micropower operation. |
| MAX6008AEUR+T | 2.5V, ±0.2% initial accuracy, ±25ppm/°C tempco, SOT23-3, 100µA–10mA operating range, 20µVRMS noise. | Lower noise and superior tempco; narrower current range limits use in very low- or high-current designs. | Choose for high-precision data acquisition where noise floor and thermal drift dominate error budget. |
Compared with TL4050C25IDBZR and MAX6008AEUR+T, the LM4040DIX3-2.5 trades absolute accuracy and tempco for broader operating current range and smallest available footprint-making it optimal for space-constrained, battery-operated systems where ±1% tolerance is acceptable.
Availability
LM4040DIX3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, battery management systems, and industrial sensor modules requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4040DIX3-2.5 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.
The LM4040 product line delivers micropower shunt voltage references optimized for size-constrained, battery-powered systems needing stable reference voltages without external capacitors.
FAQ
What is the minimum operating current for LM4040DIX3-2.5?
The LM4040DIX3-2.5 requires a minimum shunt current of 60µA to maintain regulation. This value is guaranteed across -40°C to +85°C and allows reliable operation in ultra-low-power wake-up circuits and energy-harvesting designs where bias current is tightly constrained. Below 60µA, the 2.500V output may deviate beyond specification limits.
Does LM4040DIX3-2.5 require an output capacitor?
No, the LM4040DIX3-2.5 does not require an output capacitor for stability. It is designed to remain stable with any capacitive load-including PCB trace capacitance and downstream filter caps-eliminating the need for external components and reducing BOM count. This feature simplifies layout and improves reliability in compact portable designs.
What is the temperature coefficient of LM4040DIX3-2.5?
The LM4040DIX3-2.5 has a maximum temperature coefficient of ±150ppm/°C over -40°C to +85°C. This means its output voltage may drift up to ±18.75mV across the full temperature range (125°C span), which is bounded and predictable-critical for industrial sensor calibration and closed-loop control applications where thermal drift must be quantified.
Can LM4040DIX3-2.5 be used in place of LM4040CIX3-2.5?
Yes, the LM4040DIX3-2.5 is pin-compatible and functionally interchangeable with LM4040CIX3-2.5, but with reduced initial accuracy (±1.0% vs. ±0.5%) and higher tempco (±150ppm/°C vs. ±100ppm/°C). It retains identical SC70-3 packaging, electrical interface, and operating current range-making it a cost-optimized drop-in replacement where tighter tolerances are not required.
What is the maximum shunt current rating for LM4040DIX3-2.5?
The absolute maximum shunt current for LM4040DIX3-2.5 is 20mA, though the recommended operating range is 60µA to 15mA. Exceeding 15mA risks exceeding the 174mW power dissipation limit in SC70-3 at elevated ambient temperatures, potentially degrading long-term stability or causing thermal shutdown in poorly ventilated enclosures.
LM4040DIX3-2.5 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040DIX3-2.5 FAQ
1.How can I place an order for LM4040DIX3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DIX3-2.5 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 LM4040DIX3-2.5 reliable?
The price and inventory of LM4040DIX3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DIX3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040DIX3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DIX3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DIX3-2.5?
LM4040DIX3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DIX3-2.5 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 LM4040DIX3-2.5?
For technical support, including LM4040DIX3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DIX3-2.5 requirements.
6.How does Aetrix verify that LM4040DIX3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040DIX3-2.5 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 LM4040DIX3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040DIX3-2.5?
All LM4040DIX3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DIX3-2.5, 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 LM4040DIX3-2.5 part is unused and in its original packaging.
Return procedure for LM4040DIX3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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