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Analog Devices Inc./Maxim Integrated LM4040CIX3-2.5-T
- Part No.:
- LM4040CIX3-2.5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-2.5-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LM4040CIX3-2.5-T from Maxim Integrated is a precision 2.500V, two-terminal shunt voltage reference in SC70-3 package with ±0.5% initial accuracy, 100ppm/°C max temperature coefficient, and guaranteed operation from –40°C to +85°C. It delivers stable reverse breakdown voltage across 60μA–15mA shunt current and supports space-constrained portable power management and ADC reference circuits.
For engineers reviewing the LM4040CIX3-2.5-T datasheet, LM4040CIX3-2.5-T pinout, LM4040CIX3-2.5-T application, or LM4040CIX3-2.5-T equivalent, key selection criteria include its 2.500V fixed output, SC70-3 footprint compatibility, low 35µVRMS wideband noise (10Hz–10kHz), no external capacitor requirement, and 0.9Ω max dynamic impedance at 1mA.
Technical Context
The LM4040CIX3-2.5-T uses bandgap-based shunt regulation to maintain a precise 2.500V reverse breakdown voltage without forward conduction-operating exclusively in reverse-biased mode. Its laser-trimmed internal resistor network ensures ±0.5% initial tolerance at +25°C and guarantees ±10mV total overtemperature tolerance across –40°C to +85°C.
It exhibits low dynamic impedance (≤0.9Ω at 1mA, 120Hz) and stable performance under capacitive loads up to 1µF, eliminating need for output stabilization capacitors. The device's 35µVRMS wideband noise and ±15ppm/°C typical tempco support high-resolution data acquisition systems requiring low-drift references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±10mV at +25°C; ±29mV over –40°C to +85°C - enables accurate 12-bit ADC biasing in battery-powered sensors. |
| Initial Accuracy | ±0.5% (Grade C) - ensures ≤12.5mV absolute error at 2.5V for factory-calibrated instrumentation. |
| Tempco | 100ppm/°C max - contributes ≤20.8mV drift over full temperature range, critical for industrial control loop stability. |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power sleep modes and high-current regulation without external series resistors. |
| Dynamic Impedance | 0.3Ω to 0.9Ω at 1mA - maintains <1mV output shift during 1mA load transients, essential for precision DAC references. |
| Wideband Noise | 35µVRMS (10Hz–10kHz) - limits noise contribution to <0.014% of full-scale 2.5V, suitable for 16-bit SAR ADCs. |
| Long-Term Stability | 120ppm after 1000h - corresponds to ~3µV drift over 6 months, supporting medical device calibration intervals. |
Pinout & Package
LM4040CIX3-2.5-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2 per datasheet directive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (cathode-side terminal in shunt configuration) | Connects to regulated output node; sinks current to maintain 2.500V across load. |
| 2 (–) | Cathode (anode-side terminal in shunt configuration) | Reference ground return; forms voltage drop with pin 1 to define VREF. |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; not internally bonded - prevents assembly errors. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23 - ideal for wearable sensor modules and compact IoT nodes. |
| No output capacitor required | Stable with any capacitive load up to 1µF - eliminates BOM cost and layout complexity in space-constrained designs. |
| Low 35µVRMS noise | Enables ≥16-bit effective resolution in precision data loggers without external filtering. |
| Guaranteed –40°C to +85°C operation | Validated performance across commercial/industrial ambient ranges - supports automotive cabin electronics and factory automation. |
| 60μA minimum operating current | Permits use with high-value source resistors (e.g., 100kΩ at 5V supply), reducing quiescent power in battery backup circuits. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered glucose meter with 12-bit ADC sampling analog sensor output. IC Role / Device Role / Timing Role: Provides stable 2.500V reference for ADC conversion, rejecting supply ripple and thermal drift. Use Value: ±10mV output tolerance ensures <0.4% measurement error; 35µVRMS noise avoids resolution loss in sub-mV biological signals. | Use Scenario: 4–20mA loop-powered transmitter conditioning thermocouple signals. IC Role / Device Role / Timing Role: Supplies excitation and reference voltage for signal conditioning op-amps and ADCs in harsh environments. Use Value: 100ppm/°C tempco limits gain error to <0.1% over –25°C to +70°C ambient; SC70 package withstands reflow and vibration. |
| Notebook System Monitoring | Smart Energy Meters |
Use Scenario: Real-time monitoring of CPU core voltage and battery fuel gauge via integrated PMIC ADC. IC Role / Device Role / Timing Role: Precision shunt reference for on-die ADCs measuring rail voltages and temperature sensors. Use Value: 60μA–15mA operating range allows direct integration into low-quiescent PMIC domains; no capacitor simplifies layout near noisy digital ICs. | Use Scenario: Revenue-grade electricity meter requiring metrology-grade voltage reference for 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Primary reference for energy measurement subsystem, replacing larger, higher-cost buried-zener solutions. Use Value: 120ppm long-term stability meets IEC 62053-21 Class 0.2 accuracy requirements over 10-year field life. |
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; 100ppm/°C tempco; SOT23-3 package. | Requires two external resistors for 2.5V setting; higher minimum cathode current (80μA). | Choose when design flexibility across multiple reference voltages is needed; verify layout space for resistor placement. |
| MAX6008AEUR+T | Fixed 2.5V output; 0.2% initial accuracy; 50ppm/°C tempco; SOT23-3 package; 30µVRMS noise. | Higher accuracy and lower tempco but limited to –40°C to +85°C; no SC70 option. | Choose for tighter tolerance requirements where SC70 size is not mandatory; confirm thermal derating at 15mA. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040CIX3-2.5-T offers the smallest footprint (SC70), eliminates external components, and balances accuracy, noise, and temperature stability for cost-sensitive portable instrumentation - while MAX6008AEUR+T suits higher-precision needs and TLVH431ACDBVR supports multi-voltage designs.
Availability
LM4040CIX3-2.5-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and notebook system monitoring requiring stable component supply with consistent parametric performance across production batches.
Supply support for LM4040CIX3-2.5-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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, and consumer applications.
The LM4040 product line delivers micropower, precision shunt voltage references optimized for space-constrained, battery-operated systems requiring stable DC references without external capacitors or trimming.
FAQ
What is the guaranteed operating temperature range for LM4040CIX3-2.5-T?
The LM4040CIX3-2.5-T is specified for operation from –40°C to +85°C. This range is validated per the LM4040_E and LM4040_I grade definitions in the datasheet ordering table, and the "C" grade (0.5% accuracy) is confirmed for this temperature span. Operation outside this range may result in unguaranteed voltage tolerance or tempco performance.
Can LM4040CIX3-2.5-T be used without an output capacitor?
Yes, LM4040CIX3-2.5-T is designed to be stable with any capacitive load, including zero capacitance. The device does not require an external output capacitor for frequency stability, as confirmed in the Applications Information section and Typical Operating Characteristics. This eliminates BOM cost and layout constraints in compact designs.
What is the maximum shunt current rating for LM4040CIX3-2.5-T?
The absolute maximum reverse current for LM4040CIX3-2.5-T is 20mA, per Absolute Maximum Ratings. However, the recommended operating range is 60μA to 15mA to ensure stable regulation and avoid exceeding power dissipation limits in the SC70 package. Exceeding 15mA risks thermal overload above +70°C ambient due to 2.17mW/°C derating.
How does the pin configuration of LM4040CIX3-2.5-T differ from standard three-terminal references?
LM4040CIX3-2.5-T uses a two-terminal shunt topology implemented in a 3-pin SC70 package: pin 1 is (+), pin 2 is (–), and pin 3 is N.C. (no connection). Pin 3 must remain unconnected or tied to pin 2 - it is not internally bonded. This differs from series-mode references that require input, output, and ground pins, enabling simpler biasing with a single series resistor.
What is the wideband noise specification for LM4040CIX3-2.5-T and how is it measured?
LM4040CIX3-2.5-T has a wideband noise of 35µVRMS, measured at 100µA shunt current over 10Hz to 10kHz bandwidth. This value is specified in the Electrical Characteristics table for the 2.500V variant and directly impacts ADC effective resolution - for example, limiting noise contribution to <0.014% of full-scale 2.5V.
LM4040CIX3-2.5-T 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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040CIX3-2.5-T FAQ
1.How can I place an order for LM4040CIX3-2.5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-2.5-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 LM4040CIX3-2.5-T reliable?
The price and inventory of LM4040CIX3-2.5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIX3-2.5-T is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-2.5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-2.5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-2.5-T?
LM4040CIX3-2.5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-2.5-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 LM4040CIX3-2.5-T?
For technical support, including LM4040CIX3-2.5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-2.5-T requirements.
6.How does Aetrix verify that LM4040CIX3-2.5-T is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-2.5-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 LM4040CIX3-2.5-T meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-2.5-T?
All LM4040CIX3-2.5-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-2.5-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 LM4040CIX3-2.5-T part is unused and in its original packaging.
Return procedure for LM4040CIX3-2.5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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