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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:
- IC VREF SHUNT 2.5V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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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, featuring ±0.5% initial accuracy, 100ppm/°C max temperature coefficient, 60μA–15mA operating current range, and guaranteed operation from –40°C to +85°C. It serves as a stable reference for ADCs, DACs, and power-supply monitoring in space-constrained portable electronics.
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 shunt reference stability under varying load currents, low-noise performance (35µVRMS), absence of required output capacitance, and compatibility with high-temperature industrial environments.
Technical Context
The LM4040CIX3-2.5+T uses bandgap-based shunt regulation to maintain a precise 2.500V reverse breakdown voltage across its terminals without requiring external components. Its internal laser-trimmed resistor network ensures tight initial tolerance, while low dynamic impedance (≤0.9Ω at 1mA) sustains voltage accuracy over wide current and temperature ranges.
It operates as a two-terminal device-cathode and anode-with pin 3 (N.C.) unconnected or tied to cathode. Stability is maintained across capacitive loads up to 1µF, and it exhibits 35µVRMS wideband noise (10Hz–10kHz) at 100µA bias, making it suitable for precision analog signal chains where low noise and minimal board area are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±10mV at +25°C; enables accurate 12-bit ADC reference scaling with ≤0.4% full-scale error. |
| Initial Accuracy | ±0.5% (C grade); corresponds to ±12.5mV absolute tolerance, sufficient for mid-precision sensor interfaces. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±8.75mV drift over –40°C to +85°C, supporting industrial-grade stability. |
| Operating Current | 60μA to 15mA; allows ultra-low-power battery operation down to 60μA while supporting high-current regulation up to 15mA. |
| Dynamic Impedance | ≤0.9Ω at 1mA; minimizes output voltage shift under transient load changes, improving system regulation fidelity. |
| Output Noise | 35µVRMS (10Hz–10kHz); supports 16-bit effective resolution in low-frequency measurement systems. |
| Long-Term Stability | 120ppm over 1000h; ensures <0.0125V drift after one year, critical for uncalibrated field-deployed equipment. |
Pinout & Package
The LM4040CIX3-2.5+T is housed in a RoHS-compliant 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Thermal resistance θJA is 340.4°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (reverse-bias input) | Connects to regulated supply rail; sinks shunt current to maintain reference voltage at cathode. |
| 2 (–) | Cathode (reference output) | Provides stable 2.500V output; must be decoupled locally when driving high-frequency loads. |
| 3 (N.C.) | No connection | Must remain unconnected or tied to pin 2; floating pin 3 may cause instability or parametric shift. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23, enabling dense portable PCB layouts. |
| No output capacitor required | Stable with any capacitive load (0–1µF), eliminating BOM cost and layout constraints for bypassing. |
| Wide shunt current range | 60μA–15mA operation supports both micropower wearables and higher-current industrial sensors. |
| Low 35µVRMS noise | Enables high-resolution analog measurements without additional filtering or post-regulation stages. |
| AEC-Q100 qualified variants available | While LM4040CIX3-2.5+T is rated for –40°C to +85°C, /V suffix versions meet automotive qualification standards. |
Applications
| Portable Medical Sensors | Notebook Computer Power Monitoring |
|---|---|
Use Scenario: Battery-powered glucose meter measuring analog sensor output with 12-bit ADC. IC Role / Device Role / Timing Role: Provides stable 2.500V reference for ADC conversion, rejecting supply ripple and thermal drift. Use Value: Enables ±0.5% measurement accuracy over –20°C to +60°C ambient, meeting ISO 15197 clinical requirements. | Use Scenario: Real-time monitoring of CPU core voltage (VDD) and memory rail (VDDQ) in ultrabook designs. IC Role / Device Role / Timing Role: Supplies precision reference to comparator-based fault detection circuitry for overvoltage/undervoltage alerts. Use Value: Guarantees trip-point accuracy within ±12.5mV across temperature, preventing false shutdowns during thermal transients. |
| Industrial Process Transmitters | Automotive Cabin Control Modules |
Use Scenario: 4–20mA loop-powered pressure transmitter operating in factory environments up to +85°C. IC Role / Device Role / Timing Role: References the DAC generating the loop current, ensuring linearity and long-term calibration stability. Use Value: 120ppm/1000h drift and 100ppm/°C TC allow 6-month calibration intervals without field recalibration. | Use Scenario: HVAC control unit in vehicle cabin requiring reliable voltage reference for microcontroller ADC inputs. IC Role / Device Role / Timing Role: Supplies reference for thermistor and potentiometer readings used in climate feedback loops. Use Value: Stable 2.500V output ensures ±0.25°C temperature reading accuracy over full automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | 2.5V adjustable shunt reference; 1% initial accuracy; 100ppm/°C TC; SOT23-3 package. | Requires external resistors for 2.5V setting; higher minimum cathode current (80μA). | Choose TLV431ACDBVR only if design already uses adjustable references and board layout accommodates resistor placement. |
| ADR3425ARJZ-R7 | 2.5V precision series reference; 0.1% initial accuracy; 10ppm/°C TC; SOT23-5 package. | Three-terminal series topology; requires input voltage ≥2.75V; higher quiescent current (100μA). | Select ADR3425ARJZ-R7 when ultra-low TC and higher accuracy justify added complexity and larger footprint. |
Compared with TLV431ACDBVR and ADR3425ARJZ-R7, the LM4040CIX3-2.5+T offers the smallest PCB footprint, lowest minimum operating current (60μA), and true two-terminal simplicity-ideal for space- and power-constrained shunt reference roles where ±0.5% accuracy suffices.
Availability
LM4040CIX3-2.5+T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power monitoring, industrial process transmitters, and automotive cabin control modules requiring stable component supply across extended temperature ranges.
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 precision analog and mixed-signal ICs for demanding industrial, automotive, and computing applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained systems where stability, low noise, and zero-output-capacitor operation are essential.
FAQ
What is the exact output voltage tolerance of LM4040CIX3-2.5+T at +25°C?
The LM4040CIX3-2.5+T has a nominal output voltage of 2.500V with a tolerance of ±12.5mV (±0.5%) at +25°C, as specified in the Electrical Characteristics table for the C grade. This corresponds to a guaranteed range of 2.4875V to 2.5125V under standard test conditions.
Can LM4040CIX3-2.5+T operate without an external output capacitor?
Yes, the LM4040CIX3-2.5+T is inherently stable and does not require an external output capacitor for frequency compensation. It remains stable with any capacitive load from 0 to at least 1µF, simplifying design and reducing BOM count compared to many competing references.
What is the minimum operating current for LM4040CIX3-2.5+T, and why is it important?
The LM4040CIX3-2.5+T requires a minimum shunt current of 60μA to maintain regulation. Below this threshold, the device exits its specified reverse-breakdown region, causing output voltage collapse and loss of accuracy-critical for battery-powered systems where quiescent current must be carefully budgeted.
How does the temperature coefficient affect LM4040CIX3-2.5+T performance over its full operating range?
The LM4040CIX3-2.5+T has a maximum temperature coefficient of 100ppm/°C. Over its –40°C to +85°C range (ΔT = 125°C), this contributes up to ±12.5mV total drift (2.5V × 100ppm/°C × 125°C), which is fully included in the total over-temperature tolerance specification of ±1.15% (±28.75mV).
Is LM4040CIX3-2.5+T pin-compatible with other LM4040 variants in SC70-3 package?
Yes, all LM4040 variants in the SC70-3 package-including LM4040AIX3-2.5+T, LM4040BIX3-2.5+T, and LM4040DIX3-2.5+T-share identical pinout (pin 1 = +, pin 2 = –, pin 3 = N.C.) and footprint. This allows direct substitution for accuracy or temperature coefficient trade-offs without PCB redesign.
LM4040CIX3-2.5+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):
- 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:
- -
- Qualification:
- -
- 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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