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Texas Instruments LM4040AIM3-2.5
- Part No.:
- LM4040AIM3-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AIM3-2.5.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,100
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Product details
Overview
LM4040AIM3-2.5 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23 package, delivering a stable 2.5 V reverse breakdown voltage with ±0.1% initial tolerance (A grade), 35 μVrms wideband noise (10 Hz–10 kHz), and operation across −40°C to +85°C. It serves as a compact, capacitor-free reference for analog-to-digital converters and sensor signal conditioning in industrial data acquisition systems.
For engineers reviewing the LM4040AIM3-2.5 datasheet, LM4040AIM3-2.5 pinout, LM4040AIM3-2.5 application, or LM4040AIM3-2.5 equivalent, key selection criteria include its 60 μA minimum operating current, 100 ppm/°C max temperature coefficient, no-output-capacitor requirement, and AEC-Q100 Grade 3 qualification for automotive-grade reliability in space-constrained designs.
Technical Context
The LM4040AIM3-2.5 uses Zener-zap trimming and bandgap-based temperature drift curvature correction to achieve high initial accuracy and low thermal drift. Its shunt topology requires an external current-limiting resistor and sinks load current via cathode, enabling simple two-terminal integration into feedback paths of regulators or ADC references.
It maintains stability with any capacitive load and tolerates up to 15 mA reverse current while exhibiting low dynamic impedance (0.8 Ω typical at 1 mA) and thermal hysteresis of only 0.08% over −40°C to +125°C cycling - critical for repeatable precision in field transmitters and energy infrastructure monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage, fixed and factory-trimmed for minimal calibration effort |
| Initial Tolerance | ±0.1% at 25°C (A grade), enabling high-resolution 16-bit+ data acquisition without post-manufacture trimming |
| Temp Coefficient | ≤100 ppm/°C over −40°C to +85°C, ensuring <±19 mV total drift across industrial temperature range |
| Operating Current | 60 μA to 15 mA range, supporting ultra-low-power sensor nodes and high-current reference buffering |
| Output Noise | 35 μVrms (10 Hz–10 kHz), minimizing added uncertainty in precision measurement front-ends |
| Dynamic Impedance | 0.8 Ω typical at 1 mA, providing tight regulation against load current variations |
Pinout & Package
LM4040AIM3-2.5 is housed in a 3-pin SOT-23 (DBZ) package with 2.92 mm × 1.30 mm body size. Pin 1 is Cathode (I/O), Pin 2 is Anode (O, typically grounded), and Pin 3 is NC (no connect, must float or tie to Anode per EMI guidance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Shunt current sink / output voltage node | Connects to regulated voltage rail; carries full load current and sets reference potential |
| Pin 2 (Anode) | Reference ground terminal | Typically tied to system ground; defines return path for shunt current |
| Pin 3 (NC) | No-connect terminal | Must remain unconnected or tied to Pin 2 (Anode) to reduce EMI susceptibility in noisy environments |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into space-limited PCB layouts without stability-compromising external components |
| Tolerates capacitive loads | Supports direct connection to ADC input capacitors or long traces without oscillation risk |
| Zener-zap voltage trim | Ensures ±0.1% initial accuracy at wafer sort, eliminating need for board-level trimming |
| AEC-Q100 Grade 3 qualified | Validated for automotive applications from −40°C to +85°C with robust ESD performance (±2 kV HBM) |
| Low 35 μVrms noise | Preserves SNR in 24-bit delta-sigma ADCs and high-gain instrumentation amplifier stages |
Applications
| Field Transmitters | Energy Infrastructure Monitoring |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitters in oil & gas plants. IC Role / Device Role / Timing Role: Shunt reference for DAC output scaling and sensor excitation voltage generation. Use Value: Stable 2.5 V reference enables ≤0.1% full-scale error over temperature, meeting IEC 61293 compliance. |
Use Scenario: Smart meter voltage sensing and anti-tampering detection circuits. IC Role / Device Role / Timing Role: Precision reference for metrology-grade ADCs measuring grid voltage harmonics. Use Value: 100 ppm/°C tempco and 35 μVrms noise ensure Class 0.2 accuracy under ambient temperature swings. |
| Analog Input Modules | Automotive Body Control Units |
Use Scenario: Industrial PLC analog input cards accepting ±10 V or 0–10 V signals. IC Role / Device Role / Timing Role: Reference source for programmable gain instrumentation amplifiers and SAR ADC drivers. Use Value: 60 μA min current allows operation from low-quiescent LDOs, reducing system standby power. |
Use Scenario: Cabin temperature sensor interface and HVAC actuator feedback in passenger vehicles. IC Role / Device Role / Timing Role: Voltage reference for microcontroller ADC channels monitoring thermistor networks. Use Value: AEC-Q100 Grade 3 rating guarantees functional integrity across vehicle life cycle and thermal profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050A25IDBZR | 2.5 V, ±0.1%, SOT-23, but higher 50 μVrms noise and 150 ppm/°C max tempco | Lacks AEC-Q100 qualification; suitable for commercial-grade industrial use only | Choose when cost sensitivity outweighs automotive qualification and ultra-low noise requirements |
| REF3025AIDBZR | 2.5 V, ±0.2%, SOT-23, series topology with 45 μVrms noise and 50 ppm/°C max tempco | Requires input voltage ≥2.7 V; not a drop-in replacement due to different topology and biasing | Prefer when supply headroom permits and lower tempco is prioritized over shunt simplicity |
Compared with TL4050A25IDBZR and REF3025AIDBZR, the LM4040AIM3-2.5 offers superior noise performance and automotive qualification in a true two-terminal shunt configuration, making it optimal for legacy-compatible, low-headroom, and safety-critical analog sensing where layout simplicity and proven reliability are essential.
Availability
LM4040AIM3-2.5 is available at Aetrix Electronics and suitable for field transmitters, energy infrastructure monitoring, and analog input modules requiring stable component supply, long-term traceability, and automotive-grade reliability assurance.
Supply support for LM4040AIM3-2.5 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and automotive qualification.
The LM4040-N product line delivers micropower shunt references optimized for space-constrained, high-accuracy applications including industrial automation, automotive sensors, and portable instrumentation - emphasizing ease of use, low noise, and guaranteed temperature stability.
FAQ
What is the minimum operating current for LM4040AIM3-2.5?
The LM4040AIM3-2.5 requires a minimum operating current of 60 μA at 25°C to maintain regulation within specification. This value increases slightly to 65 μA across the full −40°C to +85°C industrial temperature range, enabling reliable startup in ultra-low-power sensor nodes and battery-operated field devices using the LM4040AIM3-2.5.
Does LM4040AIM3-2.5 require an output capacitor?
No, the LM4040AIM3-2.5 does not require an output capacitor for stability - its internal design eliminates the need for external compensation. It remains stable with any capacitive load, simplifying PCB layout and reducing BOM count in applications such as portable data loggers and modular analog input cards using the LM4040AIM3-2.5.
Is LM4040AIM3-2.5 qualified for automotive applications?
Yes, the LM4040AIM3-2.5 is AEC-Q100 Grade 3 qualified (−40°C to +85°C), meeting automotive reliability and stress-test requirements. It is explicitly rated for automotive body electronics and non-safety-critical control units, distinguishing it from commercial-only variants and confirming its suitability for vehicle production programs using the LM4040AIM3-2.5.
What is the thermal hysteresis of LM4040AIM3-2.5?
The LM4040AIM3-2.5 exhibits 0.08% thermal hysteresis - defined as the voltage difference measured at 25°C after cycling to −40°C versus after cycling to +125°C. This low hysteresis ensures repeatable reference accuracy in cyclic thermal environments like outdoor energy meters and engine bay sensors relying on the LM4040AIM3-2.5.
Can LM4040AIM3-2.5 be used with capacitive loads?
Yes, the LM4040AIM3-2.5 is specifically designed to tolerate capacitive loads without oscillation or instability. This capability allows direct connection to ADC input capacitors, long PCB traces, or filtering networks - a key advantage over older shunt references and a critical enabler for high-fidelity signal chains built around the LM4040AIM3-2.5.
LM4040AIM3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM4040AIM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AIM3-2.5 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 LM4040AIM3-2.5 reliable?
The price and inventory of LM4040AIM3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AIM3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040AIM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AIM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AIM3-2.5?
LM4040AIM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AIM3-2.5 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 LM4040AIM3-2.5?
For technical support, including LM4040AIM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AIM3-2.5 requirements.
6.How does Aetrix verify that LM4040AIM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040AIM3-2.5 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 LM4040AIM3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040AIM3-2.5?
All LM4040AIM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AIM3-2.5, 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 LM4040AIM3-2.5 part is unused and in its original packaging.
Return procedure for LM4040AIM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040AIM3-2.5 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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