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Texas Instruments LM4040EIM3X-2.5
- Part No.:
- LM4040EIM3X-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040EIM3X-2.5.pdf
- Description:
- LM4040-N 100-PPM/C PRECISION MIC
- Quantity:
- Payment:
- Shipping:
Inventory:24,000
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Product details
Overview
LM4040EIM3X-2.5 from Texas Instruments (formerly National Semiconductor) is a precision micropower shunt voltage reference in SOT-23 package, delivering a stable 2.500 V reverse breakdown voltage with ±2.5 mV (±0.1%) tolerance at 25°C, 100 ppm/°C max temperature coefficient, and 35 μVrms wideband noise (10 Hz–10 kHz). It operates from 60 μA to 15 mA over −40°C to +85°C and requires no external capacitor.
For engineers reviewing the LM4040EIM3X-2.5 datasheet, LM4040EIM3X-2.5 pinout, LM4040EIM3X-2.5 application, or LM4040EIM3X-2.5 equivalent, key selection criteria include industrial-grade accuracy, low-noise performance in space-constrained systems, compatibility with capacitive loads, and direct integration into analog front-ends of data acquisition and portable instrumentation.
Technical Context
The LM4040EIM3X-2.5 uses zener-zap trimming during wafer sort to achieve initial voltage accuracy, combined with bandgap-derived temperature drift curvature correction for stable output across temperature and current variations. Its low dynamic impedance (≤1.1 Ω at 1 mA) ensures minimal voltage shift under load transients.
As a two-terminal shunt reference, it functions by sinking current through its cathode to maintain a precise voltage across an external resistor-enabling simple biasing of ADCs, DACs, and comparators without series pass elements or feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal at 100 μA; enables accurate 2.5 V reference for 12-bit+ SAR ADCs and precision op-amp biasing. |
| Voltage Tolerance | ±2.5 mV max (±0.1%) at 25°C; meets tight calibration requirements in test equipment and sensor signal chains. |
| Temp Coefficient | 100 ppm/°C max (−40°C to +85°C); ensures ≤±21 mV drift over full industrial range, critical for unregulated environments. |
| Operating Current | 60 μA min to 15 mA max; supports ultra-low-power battery operation while maintaining regulation under high-load conditions. |
| Output Noise | 35 μVrms (10 Hz–10 kHz); minimizes added noise in high-resolution measurement front-ends. |
| Dynamic Impedance | ≤1.1 Ω at 1 mA; suppresses voltage perturbation from load current steps, improving stability in dynamic systems. |
| Long-Term Stability | 120 ppm after 1000 hrs; reduces recalibration frequency in deployed instrumentation and energy meters. |
Pinout & Package
SOT-23-3 package (JEDEC TO-236AB, NS package MF03A), surface-mount, 2.92 mm × 1.3 mm footprint. Cathode-anode configuration with no internal connection to pin 3 (NC or floating).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Reference output node | Connected to system ground via external current-setting resistor; voltage develops across this terminal relative to anode. |
| Anode (Pin 2) | Ground reference | Direct connection to system ground; defines the 0 V reference point for the 2.5 V output. |
| NC (Pin 3) | No internal connection | Must be left floating or tied to pin 2 per datasheet; no electrical function-mechanical pad only. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load up to 10 μF-eliminates BOM cost and layout area for decoupling caps in compact designs. |
| Sub-miniature SOT-23 | 2.92 mm × 1.3 mm footprint-fits high-density PCBs in portable medical sensors and handheld test gear. |
| Wide operating current range | 60 μA to 15 mA-supports both microamp-level sleep modes and 12-bit ADC full-scale drive without redesign. |
| Low thermal hysteresis | 0.08% over −40°C to +125°C cycling-preserves calibration integrity in automotive and industrial field deployments. |
| Zener-zap trimmed accuracy | Initial ±0.1% tolerance achieved at wafer level-reduces post-package screening cost and improves yield consistency. |
Applications
| Portable, Battery-Powered Equipment | Data Acquisition Systems |
|---|---|
Use Scenario: Powering 16-bit delta-sigma ADCs in handheld multimeters and IoT environmental sensors. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V excitation for ratiometric sensor bridges and ADC reference input. Use Value: Enables >100 kSPS sampling with <1 LSB INL error under varying battery voltage (2.7–4.2 V) and temperature. |
Use Scenario: High-accuracy voltage measurement in benchtop DMMs and modular DAQ modules. IC Role / Device Role / Timing Role: Primary reference for auto-ranging input stages and calibration circuitry. Use Value: Delivers ±0.005% absolute accuracy over 24-hour calibration cycles, reducing factory recalibration intervals. |
| Instrumentation | Process Control |
Use Scenario: Biasing precision op-amps and programmable gain amplifiers in oscilloscope front-ends. IC Role / Device Role / Timing Role: Low-noise DC reference for offset nulling and gain-setting networks. Use Value: Contributes <0.5 μV/°C offset drift to amplifier stage, meeting Class A oscilloscope specifications. |
Use Scenario: Reference for 4–20 mA loop-powered transmitters in chemical plant monitoring nodes. IC Role / Device Role / Timing Role: Stable voltage source for DAC output scaling and current loop regulation. Use Value: Maintains <±0.1% span accuracy across 10-year field life, satisfying SIL-2 functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C25IDBZR | 2.5 V, ±0.5% initial tolerance, 75 ppm/°C max tempco, SOT-23, 60 μA–15 mA | Lower accuracy grade; suitable where ±0.5% is acceptable (e.g., non-critical power supervision) | Select when cost sensitivity outweighs precision needs and long-term stability is secondary. |
| REF3025AIDBZR | 2.5 V, ±0.2% initial tolerance, 50 ppm/°C max tempco, SOT-23, 50 μA–25 mA, series topology | Series reference with higher quiescent current; requires input headroom but offers lower noise (25 μVrms) | Choose for ultra-low-noise applications where supply margin allows ≥3.0 V input and layout permits series topology. |
Compared with TL4050C25IDBZR, LM4040EIM3X-2.5 provides tighter initial tolerance and better temperature stability; versus REF3025AIDBZR, it eliminates input headroom requirement but trades 10 μVrms higher noise for simpler two-terminal integration.
Availability
LM4040EIM3X-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data loggers, and battery-powered sensor nodes requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4040EIM3X-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 was designed specifically for high-accuracy, low-power shunt reference applications in space-constrained and thermally variable environments-targeting instrumentation, portable test gear, and industrial sensing.
FAQ
What is the minimum operating current for LM4040EIM3X-2.5?
The LM4040EIM3X-2.5 requires a minimum operating current of 60 μA to maintain regulation within specification. This value is confirmed in the Electrical Characteristics table for the E-grade (±2.0%) version at 25°C and applies across the industrial temperature range (−40°C to +85°C). Below this threshold, output voltage may deviate beyond the ±2.5 mV tolerance band.
Does LM4040EIM3X-2.5 require an external capacitor for stability?
No, the LM4040EIM3X-2.5 does not require an external capacitor for stability. Its internal design ensures stability with any capacitive load-including bypass caps up to 10 μF-making it ideal for compact layouts where board space is constrained. This eliminates capacitor-related aging, leakage, and ESR concerns in long-life applications.
What is the temperature coefficient of LM4040EIM3X-2.5?
The LM4040EIM3X-2.5 has a maximum average temperature coefficient of 100 ppm/°C over the industrial temperature range (−40°C to +85°C), measured at 1 mA operating current. At 100 μA, the coefficient is ±15 ppm/°C typical. This ensures predictable, bounded voltage drift-critical for applications like precision thermocouple conditioning and RTD measurement bridges.
Can LM4040EIM3X-2.5 be used in extended temperature applications?
The LM4040EIM3X-2.5 is rated for the industrial temperature range (−40°C to +85°C). For operation up to +125°C, TI offers the LM4040EEM3X-2.5 variant (same E-grade tolerance, extended temp range). Using LM4040EIM3X-2.5 beyond +85°C violates datasheet specifications and may result in increased drift, reduced long-term stability, or premature failure.
How is pin 3 used on the LM4040EIM3X-2.5 SOT-23 package?
Pin 3 of the LM4040EIM3X-2.5 is a no-connect (NC) terminal with no internal bond wire or silicon connection. Per the official datasheet, it must be left floating or tied directly to pin 2 (anode). Connecting pin 3 to any other net-especially to cathode or supply-may cause unpredictable behavior or damage due to internal parasitic paths.
LM4040EIM3X-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:
- ±2%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040EIM3X-2.5 FAQ
1.How can I place an order for LM4040EIM3X-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040EIM3X-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 LM4040EIM3X-2.5 reliable?
The price and inventory of LM4040EIM3X-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 LM4040EIM3X-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040EIM3X-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040EIM3X-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040EIM3X-2.5?
LM4040EIM3X-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040EIM3X-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 LM4040EIM3X-2.5?
For technical support, including LM4040EIM3X-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040EIM3X-2.5 requirements.
6.How does Aetrix verify that LM4040EIM3X-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040EIM3X-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 LM4040EIM3X-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040EIM3X-2.5?
All LM4040EIM3X-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040EIM3X-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 LM4040EIM3X-2.5 part is unused and in its original packaging.
Return procedure for LM4040EIM3X-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040EIM3X-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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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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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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