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Analog Devices Inc./Maxim Integrated LM4040AIX3-2.5+T
- Part No.:
- LM4040AIX3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040AIX3-2.5+T.pdf
- Description:
- IC VREF SHUNT 0.1% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,903
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Product details
Overview
LM4040AIX3-2.5+T from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±100ppm/°C temperature coefficient, and stable operation from 60μA to 15mA shunt current. It delivers low 35µVRMS 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 LM4040AIX3-2.5+T datasheet, LM4040AIX3-2.5+T pinout, LM4040AIX3-2.5+T application, or LM4040AIX3-2.5+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, laser-trimmed bandgap stability, ultra-small 1.8mm × 1.8mm footprint, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040AIX3-2.5+T operates as a two-terminal shunt reference, maintaining a precise 2.500V reverse breakdown voltage across its anode and cathode terminals when biased with 60μA–15mA reverse current. Its bandgap-based architecture ensures minimal drift over temperature and load variations.
It exhibits low dynamic impedance (≤0.8Ω at 1mA), wideband noise of 35µVRMS, and long-term stability of 120ppm over 1000 hours. The device tolerates any capacitive load and does not require stabilization capacitors-unlike many series references-simplifying layout in high-density PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±2.5mV at +25°C (0.1% grade); enables accurate 12-bit ADC reference with ≤0.5 LSB error at 2.5V full scale |
| Initial Accuracy | ±0.1% (±2.5mV) - laser-trimmed for high-precision calibration without system-level trimming |
| Temp Coefficient | ±100ppm/°C max - ensures ≤±0.25% voltage shift over -40°C to +85°C operating range |
| Shunt Current Range | 60μA to 15mA - supports micropower sensor nodes and higher-current DAC references |
| Dynamic Impedance | ≤0.8Ω at 1mA - maintains regulation under fast load transients (e.g., SAR ADC sampling bursts) |
| Wideband Noise | 35µVRMS (10Hz–10kHz) - suitable for 16-bit SAR and sigma-delta ADCs requiring low-noise references |
| Long-Term Stability | 120ppm over 1000h - reduces recalibration frequency in industrial monitoring systems |
Pinout & Package
LM4040AIX3-2.5+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is NC and must be left unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node (e.g., ADC REF+) |
| 2 (–) | Anode | Reference ground return; ties to system AGND or low-impedance analog ground plane |
| 3 (N.C.) | No Connection | Must remain floating or connected to pin 2 only; no internal function or signal path |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint saves >50% board area vs. SOT23; critical for wearables and compact IoT modules |
| No output capacitor required | Eliminates BOM cost and layout risk associated with capacitor selection, aging, and ESR sensitivity |
| Tolerates capacitive loads | Stable with any output capacitance (0–10µF), enabling direct connection to ADC input caps or LDO bypass networks |
| Low 35µVRMS noise | Meets noise floor requirements for 16-bit precision data acquisition without external filtering |
| Guaranteed -40°C to +85°C operation | Validated performance across commercial and extended industrial ambient ranges without derating |
Applications
| Portable Medical Sensors | Notebook Computer Power Monitoring |
|---|---|
Use Scenario: Reference for low-power ECG front-end amplifiers and 16-bit SAR ADCs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.500V bias for signal conditioning and digitization. Use Value: 0.1% accuracy and 35µVRMS noise ensure <0.5 LSB error in 16-bit conversion, supporting clinical-grade signal fidelity. | Use Scenario: Precision reference for battery fuel-gauge ICs and VRM feedback loops in ultrabooks. IC Role / Device Role / Timing Role: Two-terminal shunt reference supplying accurate 2.500V to coulomb counters and voltage supervisors. Use Value: ±100ppm/°C tempco and 60μA min current enable reliable state-of-charge estimation across ambient temperature swings. |
| Industrial Process Transmitters | Automotive Cabin Control Modules |
Use Scenario: Reference for 4–20mA loop-powered transmitter DACs in factory automation sensors. IC Role / Device Role / Timing Role: Micropower shunt reference regulating DAC output voltage in isolated 2-wire transmitters. Use Value: 60μA–15mA operating range allows full-scale operation down to 3.3V supply while maintaining 0.1% accuracy. | Use Scenario: Reference for HVAC actuator position-sensing ADCs and microcontroller VREF in infotainment control units. IC Role / Device Role / Timing Role: Stable 2.500V reference for analog inputs exposed to automotive thermal cycling (-40°C to +85°C). Use Value: Guaranteed performance over full temperature range eliminates need for software compensation in cabin climate algorithms. |
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; SOT23-3; higher 120ppm/°C tempco | Requires external resistor divider for 2.5V; less accurate and noisier (80µVRMS) | Select when adjustable output or higher voltage capability is needed; not drop-in for fixed 2.5V use |
| ADR3425ARJZ-R7 | Fixed 2.5V; 0.1% accuracy; 10ppm/°C tempco; SOT23-5; series topology; requires 100nF bypass cap | Higher accuracy and lower drift but larger size, higher quiescent current (120µA), and capacitor dependency | Choose for ultra-low-drift applications where board space and capacitor placement are acceptable |
Compared with TLVH431ACDBVR and ADR3425ARJZ-R7, the LM4040AIX3-2.5+T offers the smallest footprint, lowest noise, and zero external component requirement-making it optimal for space- and power-constrained designs where fixed 2.5V reference stability is prioritized over ultra-low tempco or adjustability.
Availability
LM4040AIX3-2.5+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 production lifecycles.
Supply support for LM4040AIX3-2.5+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 industrial, automotive, and computing applications, with emphasis on high-reliability, low-power solutions.
The LM4040 product line delivers micropower shunt voltage references optimized for space-critical, battery-operated systems requiring stable, capacitor-free reference performance across wide temperature and current ranges.
FAQ
What is the guaranteed operating temperature range for LM4040AIX3-2.5+T?
The LM4040AIX3-2.5+T is specified for operation from -40°C to +85°C. This range is fully tested and guaranteed per the datasheet's Electrical Characteristics table for the "I" grade (industrial temperature range). It is not rated for the extended -40°C to +125°C range, which applies only to "E" grade variants like LM4040AEX3-2.5+T.
Does LM4040AIX3-2.5+T require an external output capacitor?
No, LM4040AIX3-2.5+T does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, including direct connection to ADC input capacitors or LDO bypass networks. This eliminates capacitor-related BOM cost, layout complexity, and reliability concerns.
What is the minimum shunt current required for LM4040AIX3-2.5+T to maintain regulation?
The LM4040AIX3-2.5+T requires a minimum shunt current of 65µA (typical) and 45µA (guaranteed) to maintain regulation within specification. Below this threshold, output voltage accuracy degrades rapidly. Designers must ensure the source resistor and load conditions sustain ≥65µA across all operating conditions, especially at low supply voltages and high temperatures.
How does the noise performance of LM4040AIX3-2.5+T compare to other 2.5V shunt references?
LM4040AIX3-2.5+T delivers 35µVRMS wideband noise (10Hz–10kHz), measured at 100µA shunt current. This is significantly lower than typical alternatives such as TLVH431 (80µVRMS) and competitive with higher-cost series references. Its low noise supports 16-bit ADC applications without additional filtering.
Can pin 3 of LM4040AIX3-2.5+T be left floating or must it be grounded?
Pin 3 of LM4040AIX3-2.5+T is marked N.C. (No Connection) and must either be left unconnected or tied directly to pin 2 (anode). It has no internal connection and must never be driven or used as a signal path. Leaving it floating is acceptable and commonly implemented in validated layouts.
LM4040AIX3-2.5+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:
- ±0.1%
- 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
LM4040AIX3-2.5+T FAQ
1.How can I place an order for LM4040AIX3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AIX3-2.5+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 LM4040AIX3-2.5+T reliable?
The price and inventory of LM4040AIX3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AIX3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040AIX3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AIX3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AIX3-2.5+T?
LM4040AIX3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AIX3-2.5+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 LM4040AIX3-2.5+T?
For technical support, including LM4040AIX3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AIX3-2.5+T requirements.
6.How does Aetrix verify that LM4040AIX3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040AIX3-2.5+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 LM4040AIX3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040AIX3-2.5+T?
All LM4040AIX3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AIX3-2.5+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 LM4040AIX3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040AIX3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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