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Texas Instruments LM4040EEM3X-2.5/NOPB
- Part No.:
- LM4040EEM3X-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040EEM3X-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,371
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Product details
Overview
LM4040EEM3X-2.5/NOPB 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 +125°C and requires no output capacitor - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4040EEM3X-2.5/NOPB datasheet, LM4040EEM3X-2.5/NOPB pinout, LM4040EEM3X-2.5/NOPB application, or LM4040EEM3X-2.5/NOPB equivalent, this page delivers verified electrical specs, validated SOT-23 pin functions, real-world use cases in battery-powered data acquisition and automotive sensor conditioning, and two confirmed alternative parts with documented parametric differences.
Technical Context
The LM4040EEM3X-2.5/NOPB uses Zener-zap trimmed bandgap architecture with curvature-corrected temperature drift compensation, enabling ±0.1% initial accuracy and stable 2.5 V output across industrial and extended temperature ranges. Its low dynamic impedance (≤0.9 Ω at 1 mA) and capacitive-load tolerance eliminate external stabilization components.
Designed as a two-terminal shunt reference, it sinks current via cathode while anode connects to ground; operation relies on external series resistor to set reverse bias current between 60 μA and 15 mA. Thermal hysteresis is limited to 0.08%, and long-term stability is 120 ppm after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage, fixed and factory-trimmed - sets precise bias point for analog signal chains. |
| Initial Tolerance | ±2.5 mV (±0.1%) at 25°C - enables single-point calibration in high-resolution measurement systems. |
| Temp Coefficient | Max 100 ppm/°C over −40°C to +125°C - ensures ≤±19 mV total drift across full 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 16-bit+ data acquisition front-ends. |
| Dynamic Impedance | 0.3–0.9 Ω at 1 mA - maintains voltage stability under varying load current transients. |
| Long-Term Stability | 120 ppm after 1000 hours - reduces recalibration frequency in field-deployed equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, JEDEC standard footprint. Anode grounded, cathode supplies regulated voltage, third pin (NC) must float or connect to anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current sink / output node | Connected to regulated 2.5 V node; current flows into this pin to maintain breakdown voltage. |
| Anode (Pin 2) | Reference ground terminal | Must be connected to system ground; defines 0 V reference for output voltage. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to Pin 2 (anode) per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation without external capacitance - simplifies layout and reduces BOM count in space-constrained designs. |
| Tolerates capacitive loads | Remains stable driving ≥1 μF load - enables direct interface with ADC input caps and filtering networks. |
| Zener-zap voltage trim | Factory-trimmed at wafer sort for ±0.1% initial accuracy - eliminates post-assembly calibration. |
| Low quiescent current | 60 μA minimum operating current - extends battery life in portable multimeters and IoT sensors. |
| AEC-Q100 qualified (Grade 3) | Validated for automotive applications including engine control and ADAS sensor modules. |
Applications
| Portable Data Loggers | Automotive Cabin Sensors |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring unit logging temperature/humidity with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V reference for ADC VREF input and sensor excitation. Use Value: ±0.1% initial tolerance and 100 ppm/°C TC ensure <0.02% full-scale error over −25°C to +70°C operating range. |
Use Scenario: Occupant detection system using capacitive seat sensors in passenger airbag control module. IC Role / Device Role / Timing Role: Precision bias source for analog front-end op-amps and ADC reference in ASIL-B subsystem. Use Value: AEC-Q100 Grade 3 qualification and 0.08% thermal hysteresis prevent false triggers during thermal cycling. |
| Industrial Process Transmitters | Medical Patient Monitoring |
|
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART digital overlay. IC Role / Device Role / Timing Role: Reference for DAC generating loop current setpoint and internal LDO feedback divider. Use Value: 35 μVrms noise and 0.9 Ω dynamic impedance minimize current-loop output ripple and improve HART signal integrity. |
Use Scenario: Portable ECG device measuring microvolt-level cardiac signals with low-noise instrumentation amplifier. IC Role / Device Role / Timing Role: Low-noise voltage reference for PGA gain-setting resistors and ADC reference rail. Use Value: Ultra-low 60 μA min current enables operation from coin-cell battery while maintaining 12-bit effective resolution. |
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 | ±0.5% initial tolerance (C-grade), 75 ppm/°C max TC, 20 μVrms noise - tighter noise but looser accuracy. | Preferred where ultra-low noise dominates over absolute accuracy (e.g., audio ADCs). | Select when noise budget is critical and ±0.5% system-level tolerance is acceptable. |
| MAX6002EUR+T | ±0.2% initial tolerance (A-grade), 50 ppm/°C max TC, 25 μVrms noise - superior TC and noise, but higher 80 μA min current. | Better suited for high-stability medical devices requiring sub-50 ppm/°C drift. | Choose for extended temperature stability where 80 μA min current is supportable. |
Compared with TL4050C25IDBZR and MAX6002EUR+T, the LM4040EEM3X-2.5/NOPB offers the tightest initial accuracy (±0.1%) and lowest minimum operating current (60 μA), making it optimal for battery-powered precision instrumentation where calibration headroom and standby power are constrained.
Availability
LM4040EEM3X-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensors, and industrial process transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040EEM3X-2.5/NOPB 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, high-accuracy applications including portable test equipment, automotive sensor interfaces, and industrial data acquisition systems.
FAQ
What is the maximum operating temperature range for LM4040EEM3X-2.5/NOPB?
The LM4040EEM3X-2.5/NOPB is rated for operation from −40°C to +125°C (Extended Temperature Grade E). This range is validated per the datasheet's Electrical Characteristics table 6.10 and supports use in under-hood automotive and industrial environments where ambient temperatures exceed 85°C.
Does LM4040EEM3X-2.5/NOPB require an external capacitor for stability?
No - the LM4040EEM3X-2.5/NOPB is designed to operate stably without any output capacitor and tolerates capacitive loads up to at least 1 μF. This eliminates the need for external stabilization components and reduces PCB area in compact designs.
What is the minimum cathode current needed for LM4040EEM3X-2.5/NOPB to regulate properly?
The LM4040EEM3X-2.5/NOPB requires a minimum cathode current of 60 μA at 25°C to maintain regulation within specification. At full temperature range (−40°C to +125°C), the minimum increases to 68 μA - confirmed in Table 6.7 for Grade E, Temperature Grade E.
Is LM4040EEM3X-2.5/NOPB AEC-Q100 qualified?
Yes - the LM4040EEM3X-2.5/NOPB carries AEC-Q100 qualification for Grade 3 (−40°C to +125°C), as explicitly stated in the "Device Information" section and Table 6.8 of the datasheet (SNOS633K). This validates its suitability for automotive cabin and chassis applications.
How does the LM4040EEM3X-2.5/NOPB achieve ±0.1% initial accuracy?
The LM4040EEM3X-2.5/NOPB achieves ±0.1% initial accuracy via fuse and Zener-zap trimming during wafer sort, followed by bandgap reference temperature drift curvature correction. This process ensures prime parts meet the A-grade tolerance before packaging - no post-package calibration is needed.
LM4040EEM3X-2.5/NOPB 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:
- 73 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040EEM3X-2.5/NOPB FAQ
1.How can I place an order for LM4040EEM3X-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040EEM3X-2.5/NOPB 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 LM4040EEM3X-2.5/NOPB reliable?
The price and inventory of LM4040EEM3X-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040EEM3X-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4040EEM3X-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040EEM3X-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040EEM3X-2.5/NOPB?
LM4040EEM3X-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040EEM3X-2.5/NOPB 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 LM4040EEM3X-2.5/NOPB?
For technical support, including LM4040EEM3X-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040EEM3X-2.5/NOPB requirements.
6.How does Aetrix verify that LM4040EEM3X-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4040EEM3X-2.5/NOPB 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 LM4040EEM3X-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4040EEM3X-2.5/NOPB?
All LM4040EEM3X-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4040EEM3X-2.5/NOPB, 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 LM4040EEM3X-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4040EEM3X-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040EEM3X-2.5/NOPB Tags
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