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Analog Devices Inc./Maxim Integrated LM4040AIM3-2.5+T
- Part No.:
- LM4040AIM3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AIM3-2.5+T.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
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Product details
Overview
LM4040AIM3-2.5+T from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference with 0.1% initial accuracy, 100ppm/°C max temperature coefficient, and 60μA–15mA operating current range in the 3-pin SOT23 package. It delivers stable reverse-breakdown voltage for analog-to-digital converter (ADC) reference, portable battery-powered instrumentation, and industrial sensor signal conditioning circuits.
For engineers reviewing the LM4040AIM3-2.5+T datasheet, LM4040AIM3-2.5+T pinout, LM4040AIM3-2.5+T application, or LM4040AIM3-2.5+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, low 28μVRMS wideband noise (10Hz–10kHz), and compatibility with capacitive loads in space-constrained designs.
Technical Context
The LM4040AIM3-2.5+T uses laser-trimmed bandgap circuitry to maintain a precise 2.500V reverse breakdown voltage across its anode and cathode terminals. Its shunt architecture sinks current to regulate output voltage without requiring a ground reference or series pass element.
It operates over 60μA to 15mA shunt current with dynamic impedance as low as 0.3Ω at 1mA, ensuring minimal voltage deviation under load transients. The device is stable with any capacitive load and requires no output capacitor-enabling direct integration into high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±2.0mV at +25°C (0.1% grade); enables accurate 12-bit ADC reference with ≤0.5 LSB error |
| Initial Accuracy | ±0.1% (max) at +25°C; eliminates need for system-level calibration in precision measurement |
| Temp Coefficient | ±100ppm/°C (max) over -40°C to +85°C; contributes ≤±8.5mV drift across full range |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power sensor nodes and higher-current analog front-ends |
| Dynamic Impedance | 0.3Ω (typ) at 1mA; ensures <0.8mV output shift for 250μA load transients |
| Wideband Noise | 28μVRMS (10Hz–10kHz); suitable for 16-bit SAR ADCs without additional filtering |
| Long-Term Stability | 120ppm (1000h); maintains reference integrity in unattended industrial monitoring systems |
Pinout & Package
LM4040AIM3-2.5+T is housed in a RoHS-compliant 3-pin SOT23 surface-mount package (2.92mm × 1.3mm × 1.0mm), optimized for automated assembly and thermal performance on single-layer boards (θJA = 336°C/W on four-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-impedance return path; defines reference potential node |
| 2 (–) | Cathode (negative terminal) | Reverse-biased input; sinks shunt current to maintain 2.500V across terminals |
| 3 (N.C.) | No connection | Must remain unconnected or tied to pin 2; floating pin risks parasitic coupling or ESD vulnerability |
Key Features
| Feature | Design Value |
|---|---|
| 0.1% initial accuracy | Reduces post-manufacturing calibration effort in medical and test equipment |
| No output capacitor required | Eliminates BOM cost and layout area for stability components in wearables and IoT nodes |
| Stable with capacitive loads | Enables direct buffering with op-amps or driving of ADC sample capacitors without oscillation risk |
| Ultra-low 28μVRMS noise | Supports high-resolution data acquisition without added low-noise LDO or RC filtering |
| 60μA minimum operating current | Permits use in micropower applications such as battery-backed real-time clocks and wake-on-event sensors |
Applications
| Portable Instrumentation | Industrial Sensor Signal Chain |
|---|---|
Use Scenario: Handheld multimeter with 16-bit ADC and lithium coin-cell power supply. IC Role / Device Role / Timing Role: Provides stable 2.500V reference for ADC conversion and internal DAC calibration. Use Value: Enables ±0.05% measurement accuracy over temperature without recalibration, extending battery life via 60μA quiescent operation. | Use Scenario: 4–20mA loop-powered pressure transmitter with HART modulation. IC Role / Device Role / Timing Role: Supplies precision reference for current-sense amplifier and microcontroller ADC. Use Value: Maintains 0.1% total unadjusted error (TUE) across -40°C to +85°C ambient, meeting IEC 61000-6-2 immunity requirements. |
| Automotive Body Control Module | Medical Point-of-Care Device |
Use Scenario: Low-voltage interior lighting controller using CAN bus communication. IC Role / Device Role / Timing Role: References voltage for microcontroller ADC monitoring battery rail and LED driver feedback. Use Value: Guarantees stable 2.500V output despite 12V battery fluctuations and engine cranking transients. | Use Scenario: Portable blood glucose meter with electrochemical sensor and LCD display. IC Role / Device Role / Timing Role: Supplies reference for sensor biasing and ADC digitization of analog strip response. Use Value: Delivers <10ppm/°C effective drift contribution to clinical-grade accuracy per ISO 15197:2013. |
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; 200ppm/°C tempco; SOT23-3 | Lacks guaranteed 0.1% grade and tighter tempco; suited for cost-sensitive non-precision apps | Select when budget constraints outweigh need for metrology-grade stability |
| ADR3425ARJZ-R7 | 2.5V series reference; 0.1% accuracy; 10ppm/°C tempco; SOT23-5 | Requires ground connection and consumes ~100μA; not drop-in compatible due to topology and pin count | Choose only if system design allows series topology and extra pin allocation |
Compared with TLV431ACDBVR and ADR3425ARJZ-R7, the LM4040AIM3-2.5+T uniquely combines 0.1% accuracy, 100ppm/°C tempco, and true two-terminal shunt operation in SOT23-3-making it optimal for space- and power-constrained precision analog systems where ground-referenced references are impractical.
Availability
LM4040AIM3-2.5+T is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor signal chains, automotive body control modules, and medical point-of-care devices requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM4040AIM3-2.5+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 ICs for precision, power, and interface applications across industrial, automotive, and healthcare markets.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references for space-critical systems where traditional three-terminal references cannot fit-targeting portable, battery-powered, and high-density embedded instrumentation.
FAQ
What is the guaranteed operating temperature range for LM4040AIM3-2.5+T?
The LM4040AIM3-2.5+T is specified for operation from -40°C to +85°C. This range is explicitly defined in the Ordering Information table and confirmed across all electrical characteristics sections for the "I" grade (e.g., LM4040_I_ _ _). It is not rated for the extended -40°C to +125°C range, which applies only to "E" grade variants like LM4040AEM3-2.5+T.
Does LM4040AIM3-2.5+T require an external output capacitor for stability?
No, the LM4040AIM3-2.5+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC input capacitors or op-amp inputs. This eliminates BOM cost and layout area typically needed for compensation networks in other shunt references.
What is the minimum shunt current needed for LM4040AIM3-2.5+T to maintain regulation?
The LM4040AIM3-2.5+T requires a minimum shunt current of 60μA to maintain regulation within specification. This value is guaranteed across the full -40°C to +85°C temperature range and is consistent across all accuracy grades (A/B/C/D) for the 2.500V version per the Electrical Characteristics table on page 3.
How does the 0.1% initial accuracy of LM4040AIM3-2.5+T translate to absolute voltage tolerance at +25°C?
At +25°C, the 0.1% initial accuracy of LM4040AIM3-2.5+T corresponds to a tolerance of ±2.5mV around the nominal 2.500V output-guaranteeing a voltage range of 2.4975V to 2.5025V. This is explicitly listed in the "Electrical Characteristics-2.500V" table (page 3) under Reverse Breakdown Voltage (VR) for the LM4040A grade.
Can LM4040AIM3-2.5+T be used in automotive applications requiring AEC-Q100 qualification?
No, the LM4040AIM3-2.5+T is not AEC-Q100 qualified. Only specific variants denoted with "/V" in the part number (e.g., LM4040BIM3-2.5/V+T) carry AEC-Q100 qualification. The "I" grade in LM4040AIM3-2.5+T indicates industrial temperature range (-40°C to +85°C) but no automotive reliability certification.
LM4040AIM3-2.5+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SOT-23-3
LM4040AIM3-2.5+T FAQ
1.How can I place an order for LM4040AIM3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AIM3-2.5+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 LM4040AIM3-2.5+T reliable?
The price and inventory of LM4040AIM3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AIM3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040AIM3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AIM3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AIM3-2.5+T?
LM4040AIM3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AIM3-2.5+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 LM4040AIM3-2.5+T?
For technical support, including LM4040AIM3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AIM3-2.5+T requirements.
6.How does Aetrix verify that LM4040AIM3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040AIM3-2.5+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 LM4040AIM3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040AIM3-2.5+T?
All LM4040AIM3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AIM3-2.5+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 LM4040AIM3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040AIM3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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