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Texas Instruments LM4040EIM3X-2.5/NOPB
- Part No.:
- LM4040EIM3X-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040EIM3X-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,598
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Product details
Overview
LM4040EIM3X-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 ±0.5% initial tolerance (Grade E), 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 - ideal for space-constrained analog input modules and field transmitters.
For engineers reviewing the LM4040EIM3X-2.5/NOPB datasheet, LM4040EIM3X-2.5/NOPB pinout, LM4040EIM3X-2.5/NOPB application, or LM4040EIM3X-2.5/NOPB equivalent, key selection criteria include industrial-grade temperature range, low dynamic impedance (0.9 Ω typ), capacitive-load stability, and compatibility with high-EMI environments via floating or anode-connected NC pin.
Technical Context
The LM4040EIM3X-2.5/NOPB uses Zener-zap trimming during wafer sort to achieve ±0.5% initial accuracy at 25°C and incorporates bandgap-based curvature correction for stable voltage over temperature. Its shunt topology places the cathode as the active output node, sinking current to maintain precise 2.5 V across load and series resistor.
It supports operation down to 60 μA minimum current and up to 15 mA maximum, with reverse dynamic impedance of ≤0.9 Ω at 1 mA - enabling high PSRR and low load regulation error (<1 mV over 60 μA–1 mA, <8 mV over 1–15 mA) without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage; fixed value, no adjustment required. |
| Initial Tolerance | ±0.5% (Grade E) at 25°C; ±50 mV absolute deviation, verified 100% at production test. |
| Temp Coefficient | ≤100 ppm/°C max over −40°C to +85°C; ensures ≤±1.63 mV drift across full industrial range. |
| Operating Current | 60 μA to 15 mA; enables ultra-low-power sensor biasing and high-current DAC reference use. |
| Noise (10Hz–10kHz) | 35 μVrms typical; low enough for 16-bit ADC reference without additional filtering. |
| Dynamic Impedance | ≤0.9 Ω at 1 mA; minimizes load-induced voltage shift and improves regulation under varying current. |
| Thermal Hysteresis | 0.08% max; limits voltage memory effect after thermal cycling between −40°C and +125°C. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, lead-free, RoHS-compliant. Thermal resistance RθJA = 291.9°C/W (board-mounted).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt Output / Current Sink | Active output node; voltage referenced to anode; sinks current to regulate 2.5 V across external load. |
| Anode (Pin 2) | Reference Ground | Typically connected to system ground; defines the 0 V reference for cathode voltage. |
| NC (Pin 3) | No Connect | Must float or connect to anode; recommended for EMI suppression in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor needed | Internally compensated design eliminates output capacitor requirement while maintaining stability with any capacitive load. |
| Capacitive-load tolerant | Stable with unlimited output capacitance - simplifies layout in ADC reference and sensor signal chains. |
| Zener-zap trimmed accuracy | Fuse-based wafer-level trimming ensures Grade E (±0.5%) initial tolerance without post-package calibration. |
| Low quiescent current | 60 μA minimum operating current enables use in battery-powered field transmitters and energy-harvesting systems. |
| EMI mitigation pin | NC pin (Pin 3) can be tied to anode to reduce noise coupling in high-interference automotive or industrial settings. |
Applications
| Field Transmitter | Data Acquisition |
|---|---|
Use Scenario: 4–20 mA loop-powered sensor transmitter in oil & gas or process control. IC Role / Device Role / Timing Role: Shunt reference for precision DAC and op-amp biasing, setting current-loop scaling. Use Value: ±0.5% initial tolerance and 100 ppm/°C TC ensure <0.2% full-scale error over industrial temperature range without recalibration. | Use Scenario: Isolated analog input module measuring thermocouple or RTD signals. IC Role / Device Role / Timing Role: Stable 2.5 V reference for 16-bit SAR ADC and instrumentation amplifier gain-setting. Use Value: 35 μVrms noise and ≤0.9 Ω dynamic impedance preserve ENOB >15.5 bits in 100 kSPS sampling. |
| Energy Infrastructure | Automotive Body Control |
Use Scenario: Smart meter voltage monitoring and anti-tampering detection circuitry. IC Role / Device Role / Timing Role: Low-power reference for voltage supervisor and ADC in always-on metering ICs. Use Value: 60 μA min operating current extends battery life in backup power modes; SOT-23 footprint saves PCB area. | Use Scenario: Cabin temperature sensor interface in AEC-Q100 qualified body control module. IC Role / Device Role / Timing Role: Precision reference for microcontroller ADC measuring NTC thermistor voltage divider. Use Value: Industrial-grade −40°C to +85°C operation and 0.08% thermal hysteresis prevent calibration drift after thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable 1.24–18 V output; 0.5% initial tolerance; higher 80 μA min current; 200 ppm/°C TC. | Requires two external resistors; less suitable for fixed-voltage, ultra-low-drift use cases. | Choose when adjustable output or higher voltage (>2.5 V) is needed; avoid if fixed 2.5 V and <100 ppm/°C TC are mandatory. |
| MAX6008AEUR+T | Fixed 2.5 V; ±0.2% (A-grade) tolerance; 75 ppm/°C TC; SC70-3 package; 65 μA min current. | Higher accuracy and lower TC, but SC70 footprint differs and max current limited to 10 mA. | Prefer for tighter tolerance/TC requirements where SOT-23 is not mandatory; verify layout compatibility and current headroom. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040EIM3X-2.5/NOPB offers optimal balance of fixed 2.5 V output, SOT-23 compactness, 60 μA ultra-low start-up current, and proven stability in high-capacitance sensor interfaces - making it the preferred choice for cost-sensitive, space-constrained industrial analog front-ends.
Availability
LM4040EIM3X-2.5/NOPB is available at Aetrix Electronics and suitable for field transmitters, data acquisition systems, and energy infrastructure monitoring requiring stable component supply, long-term manufacturability, and AEC-Q100-aligned reliability.
Supply support for LM4040EIM3X-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 for space-critical, low-drift applications - engineered for industrial and automotive environments where accuracy, thermal stability, and layout simplicity are essential.
FAQ
What is the operating temperature range for the LM4040EIM3X-2.5/NOPB?
The LM4040EIM3X-2.5/NOPB is rated for industrial temperature operation from −40°C to +85°C. It is not qualified for extended −40°C to +125°C operation - that grade requires the 'Q1' automotive variant (e.g., LM4040QCEM3X-2.5/NOPB). The LM4040EIM3X-2.5/NOPB maintains ±0.5% initial tolerance and ≤100 ppm/°C temperature coefficient across its specified range.
Does the LM4040EIM3X-2.5/NOPB require an external output capacitor?
No, the LM4040EIM3X-2.5/NOPB does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC input capacitors or long PCB traces. This eliminates BOM cost and layout complexity while preserving transient response and noise performance - a key advantage over many older shunt references.
What is the function of Pin 3 (NC) on the LM4040EIM3X-2.5/NOPB?
Pin 3 is a no-connect terminal on the LM4040EIM3X-2.5/NOPB SOT-23 package. It must either remain floating or be connected to the anode (Pin 2). TI recommends connecting it to the anode in high-EMI environments - such as near switching power supplies or motors - to reduce noise coupling into the reference node and improve long-term voltage stability.
How does the LM4040EIM3X-2.5/NOPB compare to the A-grade version (LM4040AIM3X-2.5/NOPB)?
The LM4040EIM3X-2.5/NOPB has ±0.5% initial tolerance and 100 ppm/°C max temperature coefficient, while the A-grade LM4040AIM3X-2.5/NOPB offers ±0.1% tolerance and same TC spec. Both share identical SOT-23-3 packaging, 60 μA min current, 35 μVrms noise, and pinout. Choose the E-grade for cost-sensitive industrial designs where ±0.5% meets system accuracy targets; select A-grade only when sub-0.2% total error budget is required.
Can the LM4040EIM3X-2.5/NOPB be used in automotive applications?
The LM4040EIM3X-2.5/NOPB is not AEC-Q100 qualified and is intended for industrial use only. For automotive applications, TI offers the LM4040QCEM3X-2.5/NOPB (Grade C, Q1-qualified) or LM4040QBIM3X-2.5/NOPB (Grade B, Q1-qualified), which undergo extended temperature stress testing and failure analysis per AEC standards. Using the non-Q1 LM4040EIM3X-2.5/NOPB in automotive systems may violate functional safety requirements.
LM4040EIM3X-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:
- 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/NOPB FAQ
1.How can I place an order for LM4040EIM3X-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040EIM3X-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 LM4040EIM3X-2.5/NOPB reliable?
The price and inventory of LM4040EIM3X-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 LM4040EIM3X-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4040EIM3X-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040EIM3X-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040EIM3X-2.5/NOPB?
LM4040EIM3X-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040EIM3X-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 LM4040EIM3X-2.5/NOPB?
For technical support, including LM4040EIM3X-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040EIM3X-2.5/NOPB requirements.
6.How does Aetrix verify that LM4040EIM3X-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4040EIM3X-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 LM4040EIM3X-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4040EIM3X-2.5/NOPB?
All LM4040EIM3X-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4040EIM3X-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 LM4040EIM3X-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4040EIM3X-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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