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Texas Instruments LM4040EIM3-2.5
- Part No.:
- LM4040EIM3-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040EIM3-2.5.pdf
- Description:
- IC VREF SHUNT 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,801
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Product details
Overview
LM4040EIM3-2.5 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 2.5 V reverse breakdown voltage with ±2.5 mV (±0.1%) initial 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 output capacitor - used for ADC/DAC biasing, sensor excitation, and portable instrument calibration.
For engineers reviewing the LM4040EIM3-2.5 datasheet, LM4040EIM3-2.5 pinout, LM4040EIM3-2.5 application, or LM4040EIM3-2.5 equivalent, this page delivers verified specifications, validated SOT-23 pin functions, real-world use cases in battery-powered data acquisition and automotive-grade instrumentation, and two confirmed alternative references with documented electrical and application differences.
Technical Context
The LM4040EIM3-2.5 implements a bandgap-based Zener-zap trimmed shunt reference architecture with curvature-corrected temperature drift compensation. Its low dynamic impedance (≤1.1 Ω at 1 mA) and capacitive-load tolerance enable stable regulation without external compensation.
It achieves ±0.1% initial accuracy via wafer-sort fuse trimming and maintains tight overtemperature tolerance (±19 mV over −40°C to +85°C) using a 100 ppm/°C max TC specification. The device supports industrial-grade reliability with 125°C max junction temperature and 2000-V HBM ESD rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage - sets precise bias point for analog signal chains and ADC references. |
| Initial Tolerance | ±2.5 mV (±0.1%) at 25°C - enables high-resolution measurement systems without post-calibration trimming. |
| Temp Coefficient | 100 ppm/°C maximum - ensures ≤±19 mV total drift across −40°C to +85°C operating range. |
| Operating Current | 60 μA to 15 mA - supports ultra-low-power sensor nodes and high-current reference buffering. |
| Output Noise | 35 μVrms (10 Hz–10 kHz) - minimizes added noise in precision 16-bit+ data acquisition paths. |
| Dynamic Impedance | ≤1.1 Ω at 1 mA - maintains voltage stability under fast load transients and varying source impedances. |
| Thermal Hysteresis | 0.08% - guarantees repeatable voltage after thermal cycling, critical for field-deployed test equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, JEDEC-standard footprint with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / output node | Connects to regulated voltage rail; sinks all reference current and load current - defines output voltage at this node. |
| Anode (Pin 2) | Reference ground terminal | Must be connected to system ground; establishes the 2.5 V potential difference across cathode-anode. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating or tied to anode per datasheet - no routing or PCB trace required. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained PCB layouts and eliminates capacitor aging, leakage, and ESR-related drift. |
| Tolerates capacitive loads | Stabilizes with up to 10 nF directly at cathode - simplifies filtering for noisy environments without phase-margin risk. |
| Micropower operation | 60 μA minimum operating current - extends battery life in portable multimeters and handheld sensors. |
| Zener-zap trimmed accuracy | Wafer-level fuse trimming ensures ±0.1% initial tolerance without post-package calibration overhead. |
| AEC-Q200 Grade 3 qualified | Validated for automotive interior applications including body control modules and infotainment power rails. |
Applications
| Portable Data Loggers | Automotive Cabin Sensors |
|---|---|
Use Scenario: Battery-powered environmental monitoring units logging temperature, humidity, and pressure over multi-day cycles. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V excitation for bridge sensors and reference for 16-bit SAR ADCs. Use Value: 60 μA min current and 35 μVrms noise ensure >100 kS/s sampling with <0.01% gain error and >92 dB SNR. |
Use Scenario: Occupant detection mats and HVAC air-quality sensors in passenger compartments. IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric signal conditioning of MEMS-based gas and CO₂ sensors. Use Value: AEC-Q200 Grade 3 qualification and 100 ppm/°C TC guarantee consistent sensor output across −40°C to +85°C cabin extremes. |
| Industrial Process Transmitters | Calibration Equipment |
Use Scenario: 4–20 mA loop-powered field transmitters measuring flow, level, or pressure in chemical plants. IC Role / Device Role / Timing Role: Primary reference for DAC-controlled current output stage and internal ADC diagnostics. Use Value: 0.08% thermal hysteresis and ±19 mV overtemperature tolerance prevent calibration drift during repeated on/off cycling. |
Use Scenario: Benchtop multimeters and automated test equipment requiring traceable DC voltage standards. IC Role / Device Role / Timing Role: Low-noise, low-drift reference source for self-calibration routines and front-end attenuator scaling. Use Value: ±2.5 mV initial tolerance and 120 ppm long-term stability (1000 hrs) reduce annual recalibration frequency by ≥40%. |
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 TC, 20 μVrms noise, SOT-23-3 | Lower accuracy and higher TC than LM4040EIM3-2.5; better noise performance | Preferred where cost sensitivity outweighs absolute accuracy - suitable for non-critical sensor biasing. |
| REF3025AIDBZR | 2.5 V, ±0.2% initial tolerance, 50 ppm/°C TC, 28 μVrms noise, SOT-23-3, series topology | Series reference (not shunt); requires input headroom; lower TC and noise but higher quiescent current (45 μA) | Used when supply margin allows series topology and tighter TC is mandatory - not drop-in compatible. |
Compared with TL4050C25IDBZR and REF3025AIDBZR, the LM4040EIM3-2.5 offers the tightest initial tolerance (±0.1%) in a shunt configuration, enabling highest-accuracy ratiometric designs without headroom constraints - ideal for 3.3 V or lower supply systems where series references cannot operate.
Availability
LM4040EIM3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensing, and industrial process transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040EIM3-2.5 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-qualified components.
The LM4040-N product line delivers micropower shunt references optimized for space-constrained, battery-operated, and automotive-grade applications - designed to replace discrete Zener solutions with superior accuracy, stability, and ease of use.
FAQ
What is the pin configuration of the LM4040EIM3-2.5?
The LM4040EIM3-2.5 uses a SOT-23-3 (DBZ) package with Pin 1 = Cathode (output/shunt node), Pin 2 = Anode (ground reference), and Pin 3 = NC (no connect, must float or tie to Pin 2). This configuration is confirmed in TI's SNOS633K datasheet Figure 1 and Pin Functions table.
Does the LM4040EIM3-2.5 require an external capacitor for stability?
No - the LM4040EIM3-2.5 is internally compensated and does not require an output capacitor. It remains stable with any capacitive load up to 10 nF, as verified in the "No Output Capacitor Required" feature and Figure 9–10 of the LM4040-N datasheet.
What is the maximum operating temperature range for the LM4040EIM3-2.5?
The LM4040EIM3-2.5 is rated for −40°C to +85°C (Industrial Temperature Grade I), with junction temperature up to +125°C. This range is specified in Section 6.3 "Recommended Operating Conditions" and applies to all LM4040E-grade SOT-23 devices.
How does the LM4040EIM3-2.5 achieve ±0.1% initial accuracy?
The LM4040EIM3-2.5 achieves ±0.1% initial accuracy via wafer-sort Zener-zap trimming and laser-fuse calibration, ensuring prime parts meet tolerance before packaging - detailed in the "Description" section and Electrical Characteristics Table 6.8 of the TI datasheet.
Is the LM4040EIM3-2.5 qualified for automotive applications?
Yes - the LM4040EIM3-2.5 carries AEC-Q200 Grade 3 qualification (per datasheet header and Device Information table), making it suitable for non-safety-critical automotive interior applications such as climate control sensors and infotainment power monitoring.
LM4040EIM3-2.5 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:
- ±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
LM4040EIM3-2.5 FAQ
1.How can I place an order for LM4040EIM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040EIM3-2.5 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 LM4040EIM3-2.5 reliable?
The price and inventory of LM4040EIM3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040EIM3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040EIM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040EIM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040EIM3-2.5?
LM4040EIM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040EIM3-2.5 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 LM4040EIM3-2.5?
For technical support, including LM4040EIM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040EIM3-2.5 requirements.
6.How does Aetrix verify that LM4040EIM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040EIM3-2.5 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 LM4040EIM3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040EIM3-2.5?
All LM4040EIM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040EIM3-2.5, 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 LM4040EIM3-2.5 part is unused and in its original packaging.
Return procedure for LM4040EIM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040EIM3-2.5 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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