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Texas Instruments LM4040CIM3X-2.5
- Part No.:
- LM4040CIM3X-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3X-2.5.pdf
- Description:
- LM4040-N 100-PPM/C PRECISION MIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,735
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Product details
Overview
LM4040CIM3X-2.5 from Texas Instruments (formerly National Semiconductor) is a precision micropower shunt voltage reference in SOT-23 package, delivering 2.500 V ±12 mV (±0.5%) output at 25°C with 100 ppm/°C max temperature coefficient, 60 μA to 15 mA operating current range, and 35 μVrms wideband noise (10 Hz–10 kHz). It enables stable biasing in portable battery-powered instrumentation and data acquisition systems.
For engineers reviewing the LM4040CIM3X-2.5 datasheet, LM4040CIM3X-2.5 pinout, LM4040CIM3X-2.5 application, or LM4040CIM3X-2.5 equivalent, key selection criteria include initial tolerance, temperature drift, minimum operating current, dynamic impedance, and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4040CIM3X-2.5 uses zener-zap trimming during wafer sort to achieve ±0.5% initial accuracy at 25°C and incorporates bandgap-based temperature drift curvature correction for stable performance across −40°C to +85°C industrial temperature range. Its low 0.9 Ω typical reverse dynamic impedance ensures minimal output voltage shift under varying load currents.
Unlike traditional zener references, it requires no output capacitor and tolerates arbitrary capacitive loads-simplifying layout in space-constrained designs while maintaining stability across its full 60 μA–15 mA operating current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal at 100 μA; enables precise ADC/DAC reference and sensor excitation at standard logic-compatible level. |
| Initial Tolerance | ±12 mV (±0.5%) at 25°C; defines worst-case DC offset in calibration-critical circuits like portable multimeters. |
| Temp Coefficient | 100 ppm/°C max over −40°C to +85°C; contributes ≤±0.021 V drift across full industrial range, critical for long-term measurement integrity. |
| Operating Current | 60 μA min to 15 mA max; supports ultra-low-power sleep modes and high-current regulation without external components. |
| Noise (10 Hz–10 kHz) | 35 μVrms; limits added uncertainty in high-resolution (≥16-bit) analog signal chains. |
| Dynamic Impedance | 0.9 Ω max at 1 mA; minimizes load-induced voltage variation in dynamically changing current-sink applications. |
| Long-Term Stability | 120 ppm after 1000 hrs; quantifies aging-induced drift in field-deployed energy metering or process control hardware. |
Pinout & Package
SOT-23-3 package (JEDEC TO-236AB, NS package MF03A), 2.92 mm × 1.3 mm footprint, surface-mount compatible with standard reflow profiles. Thermal pad not present; power dissipation limited to 306 mW at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference cathode return path | Connected to system ground; forms current sink return node-must be low-impedance for stable regulation. |
| Cathode (Pin 2) | Output voltage terminal | Delivers regulated 2.5 V; connects to load and feedback network; requires no external capacitor for stability. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to Pin 2 per datasheet-no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Eliminates BOM cost and board area for external stabilization-enables direct integration into compact wearable sensor nodes. |
| Tolerates capacitive loads | Stable operation with >100 nF load capacitance simplifies filtering in noisy industrial environments without phase-margin analysis. |
| Sub-miniature SOT-23 package | 2.92 mm × 1.3 mm footprint reduces PCB real estate by >50% vs. TO-92, ideal for handheld test equipment and IoT edge sensors. |
| Low 60 μA minimum operating current | Enables operation from microamp-level supply rails in battery-backed RTC or memory retention circuits. |
| 100 ppm/°C max tempco | Ensures <±0.02 V output variation over −40°C to +85°C-meets Class I accuracy requirements in portable medical diagnostics. |
Applications
| Portable, Battery-Powered Equipment | Data Acquisition Systems |
|---|---|
Use Scenario: Powering 12-bit ADC in handheld multimeter powered by two AA cells. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC conversion, rejecting battery voltage sag and ripple. Use Value: Enables ±0.5 LSB accuracy over full battery life (0.9–3.0 V input) without recalibration. | Use Scenario: Precision analog front-end in modular DAQ module for factory floor monitoring. IC Role / Device Role / Timing Role: Supplies reference voltage to multiplexed sensor signal conditioning chain (RTD, thermocouple, strain gauge). Use Value: Maintains <0.01% gain error across temperature cycles, eliminating need for per-channel auto-zero routines. |
| Instrumentation | Process Control |
Use Scenario: Calibration source in benchtop digital calibrator generating 2.5 V test signals. IC Role / Device Role / Timing Role: Acts as primary voltage standard traceable to internal metrology chain. Use Value: ±12 mV initial tolerance and 120 ppm long-term stability support annual calibration intervals per ISO/IEC 17025. | Use Scenario: Reference for 4–20 mA transmitter loop-powered by 24 V DC supply. IC Role / Device Role / Timing Role: Sets precision current-sense threshold in HART-compliant analog output stage. Use Value: 100 ppm/°C tempco ensures <±0.1% full-scale error over plant ambient range (−20°C to +60°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Adjustable 2.495 V reference; higher 1 mA min current; 22 Ω dynamic impedance; requires external resistor divider. | Used where programmability or tighter initial tolerance (±0.5%) at 25°C is needed-but adds two resistors and layout complexity. | Select when adjustable output or higher current drive (>100 mA) is required; avoid if board space or BOM count is constrained. |
| REF3025AIDBZR | 2.5 V series reference; 50 μA quiescent current; 30 ppm/°C tempco; requires 1 μF output capacitor; 3-pin SOT-23. | Preferred in low-noise, low-drift applications (e.g., precision weigh scales); incompatible with shunt topology constraints. | Choose for superior drift performance and lower noise; only viable if circuit allows series configuration and can accommodate external capacitor. |
Compared with TL431ACDBVR and REF3025AIDBZR, the LM4040CIM3X-2.5 offers lowest component count (no external parts), smallest footprint, and guaranteed stability with any capacitive load-making it optimal for cost-sensitive, space-limited shunt reference roles where ±0.5% tolerance suffices.
Availability
LM4040CIM3X-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and process control systems requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4040CIM3X-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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for the LM4040 family, including legacy process control and qualification standards.
The LM4040 product line delivers precision shunt references optimized for micropower, space-constrained applications-targeting portable test equipment, battery-operated sensors, and industrial signal conditioning where simplicity and reliability outweigh programmability.
FAQ
What is the maximum operating current for the LM4040CIM3X-2.5?
The LM4040CIM3X-2.5 supports a maximum operating current of 15 mA. This limit ensures safe power dissipation within the SOT-23 package's 306 mW rating at 25°C ambient. Exceeding 15 mA risks thermal overload and parametric shift, especially above 85°C ambient. The LM4040CIM3X-2.5 datasheet specifies this as an absolute maximum rating-not a recommended continuous operating point.
Does the LM4040CIM3X-2.5 require an external capacitor for stability?
No, the LM4040CIM3X-2.5 does not require an external capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, including direct connection to large decoupling caps or ADC input filters. This eliminates BOM cost and layout risk associated with capacitor selection and placement-confirmed in the LM4040CIM3X-2.5 datasheet Section 8.2.1.
What is the temperature range specification for the LM4040CIM3X-2.5?
The LM4040CIM3X-2.5 is rated for the industrial temperature range of −40°C to +85°C. It is not qualified for extended range (−40°C to +125°C); that specification applies only to variants with "E" suffix (e.g., LM4040CEM3-2.5). Using LM4040CIM3X-2.5 beyond +85°C may result in increased output drift and reduced long-term reliability.
How does the LM4040CIM3X-2.5 compare to the A-grade version (LM4040AIM3X-2.5)?
The LM4040CIM3X-2.5 has ±0.5% initial tolerance (±12 mV) and 100 ppm/°C max temperature coefficient, whereas the A-grade LM4040AIM3X-2.5 offers ±0.1% (±2.5 mV) and same tempco. Both share identical SOT-23 package, 60 μA min current, and 35 μVrms noise. Choose LM4040CIM3X-2.5 for cost-sensitive applications where ±0.5% meets system accuracy targets.
What is the meaning of the 'X' suffix in LM4040CIM3X-2.5?
The 'X' in LM4040CIM3X-2.5 indicates tape-and-reel packaging: 3000 units per reel. The base part LM4040CIM3-2.5 is supplied in 1000-unit reels. Functionally and electrically, LM4040CIM3X-2.5 is identical to LM4040CIM3-2.5-only packaging differs. This distinction is documented in the LM4040 ordering information table on page 2 of the datasheet.
LM4040CIM3X-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CIM3X-2.5 FAQ
1.How can I place an order for LM4040CIM3X-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3X-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 LM4040CIM3X-2.5 reliable?
The price and inventory of LM4040CIM3X-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 LM4040CIM3X-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040CIM3X-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3X-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3X-2.5?
LM4040CIM3X-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3X-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 LM4040CIM3X-2.5?
For technical support, including LM4040CIM3X-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3X-2.5 requirements.
6.How does Aetrix verify that LM4040CIM3X-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3X-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 LM4040CIM3X-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040CIM3X-2.5?
All LM4040CIM3X-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3X-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 LM4040CIM3X-2.5 part is unused and in its original packaging.
Return procedure for LM4040CIM3X-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIM3X-2.5 Tags
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