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Texas Instruments LM4040QEEM3-2.5/NOPB
- Part No.:
- LM4040QEEM3-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040QEEM3-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
LM4040QEEM3-2.5/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23 package, delivering a stable 2.5V reverse breakdown voltage with ±0.1% initial tolerance (A grade), 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-used in high-accuracy analog signal conditioning for automotive sensor modules.
For engineers reviewing the LM4040QEEM3-2.5/NOPB datasheet, LM4040QEEM3-2.5/NOPB pinout, LM4040QEEM3-2.5/NOPB application, or LM4040QEEM3-2.5/NOPB equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, shunt topology compatibility with current-sourced bias networks, low-noise performance in ADC reference paths, and SOT-23 footprint constraints in space-constrained PCB layouts.
Technical Context
The LM4040QEEM3-2.5/NOPB implements a trimmed Zener-based shunt reference architecture with bandgap curvature correction for flat temperature drift. Its dynamic impedance remains below 0.8 Ω at 1 mA, enabling stable regulation under varying load currents without external compensation.
Designed for AEC-Q100 Grade 1 automotive applications, it supports extended temperature operation (−40°C to +125°C) and tolerates capacitive loads up to 10 nF while maintaining stability-eliminating need for series resistance or output capacitance in most configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage, fixed and factory-trimmed-enables direct replacement of 2.5V references in data acquisition front-ends. |
| Initial Tolerance | ±0.1% at 25°C (A grade)-supports 12-bit+ system accuracy without calibration in industrial transmitters. |
| Temp Coefficient | ≤100 ppm/°C (max, −40°C to +125°C)-ensures <±0.25 mV drift across full automotive operating range. |
| Noise (10Hz–10kHz) | 35 μVrms typical-low enough to avoid degrading ENOB in 16-bit SAR ADCs. |
| Operating Current | 60 μA to 15 mA-compatible with ultra-low-power microcontrollers and high-current buffer stages. |
| Dynamic Impedance | 0.3–0.8 Ω at 1 mA-minimizes load-induced voltage shift in precision current-sink topologies. |
| Thermal Hysteresis | 0.08%-limits voltage memory effect after thermal cycling in engine control units. |
Pinout & Package
SOT-23 (DBZ) 3-pin surface-mount package, 2.92 mm × 1.30 mm body size, with standard anode/cathode configuration and floating third terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | I/O | Main shunt current path and output node-connects to regulated voltage rail; sinks current from external bias resistor. |
| Anode (Pin 2) | O | Reference ground node-must be connected to system ground; defines cathode-to-anode voltage as VR. |
| NC (Pin 3) | - | No-connect terminal-left floating or tied to anode per EMI mitigation guidance; not internally bonded in SOT-23 variant. |
Key Features
| Feature | Design Value |
|---|---|
| Zener-zap voltage trim | Factory-laser-trimmed at wafer sort ensures ±0.1% initial accuracy-reduces post-assembly calibration effort in production test. |
| No external capacitor required | Stable with 0–10 nF capacitive load-simplifies layout in compact sensor nodes and eliminates capacitor BOM cost and aging drift. |
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C operation with ESD ratings (HBM ±2 kV, CDM ±750 V)-meets functional safety requirements for powertrain sensors. |
| Low quiescent current | 60 μA minimum operating current-enables use in battery-powered field instruments with multi-year runtime. |
| Wide current range | Operates from 60 μA to 15 mA-supports both low-power microcontroller references and high-current op-amp biasing without redesign. |
Applications
| Automotive Engine Control Unit | Industrial Analog Input Module |
|---|---|
|
Use Scenario: Reference voltage for oxygen sensor signal conditioning and knock sensor ADC front-end in engine management systems. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V bias for ratiometric measurement against 5V supply rails. Use Value: AEC-Q100 Grade 1 qualification and 100 ppm/°C tempco ensure consistent sensor linearity across under-hood thermal cycles. |
Use Scenario: Precision reference for 16-bit delta-sigma ADCs in programmable logic controller (PLC) analog input cards. IC Role / Device Role / Timing Role: Low-noise (35 μVrms) shunt reference replacing bulkier series references in isolated I/O modules. Use Value: Eliminates need for output capacitor and reduces board area by >30% versus SC70 alternatives while maintaining 12-bit effective resolution. |
| Energy Infrastructure Metering | Medical Patient Monitor Signal Chain |
|
Use Scenario: Calibration reference for polyphase electricity meter ICs measuring active/reactive power in smart grid meters. IC Role / Device Role / Timing Role: Stable 2.5V reference for metrology-grade ADCs requiring long-term drift <100 ppm over 10 years. Use Value: 120 ppm long-term stability (1000 hrs) and 0.08% thermal hysteresis minimize recalibration frequency in sealed outdoor enclosures. |
Use Scenario: Reference source for ECG/EEG front-end instrumentation amplifiers and anti-aliasing filters. IC Role / Device Role / Timing Role: Micropower shunt reference supplying clean 2.5V to low-noise op-amps in battery-operated portable monitors. Use Value: 60 μA min operating current extends single-cell Li-ion battery life beyond 72 hours during continuous monitoring mode. |
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 | 2.5V, ±0.5% initial tolerance, 75 ppm/°C max tempco, SOT-23 package | Lower accuracy grade; suitable for non-critical industrial sensing where ±0.5% is acceptable | Select when cost sensitivity outweighs need for AEC-Q100 qualification or sub-0.2% tolerance. |
| MAX6002EUR+T | 2.5V, ±0.2% initial tolerance, 100 ppm/°C max tempco, SOT-23, no AEC-Q100 rating | Lacks automotive qualification; rated only for −40°C to +85°C industrial grade | Choose for commercial-grade data loggers where extended temperature range is unnecessary. |
Compared with TL4050C25IDBZR and MAX6002EUR+T, the LM4040QEEM3-2.5/NOPB uniquely combines AEC-Q100 Grade 1 qualification, ±0.1% tolerance, and 125°C operation-making it the only drop-in solution for automotive powertrain and ADAS sensor reference designs requiring zero-layout change upgrades.
Availability
LM4040QEEM3-2.5/NOPB is available at Aetrix Electronics and suitable for automotive engine control units, industrial analog input modules, and energy infrastructure metering requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040QEEM3-2.5/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-grade reliability validation.
The LM4040-N product line delivers micropower shunt references optimized for space-constrained, high-accuracy applications including automotive sensors, industrial process control, and medical instrumentation-prioritizing low drift, low noise, and qualification rigor.
FAQ
What is the maximum operating temperature for LM4040QEEM3-2.5/NOPB?
The LM4040QEEM3-2.5/NOPB is AEC-Q100 Grade 1 qualified and specified for continuous operation from −40°C to +125°C ambient temperature. Its junction temperature must remain ≤125°C, and derating applies above 85°C ambient based on thermal resistance (RθJA = 291.9°C/W for SOT-23). The LM4040QEEM3-2.5/NOPB maintains ±0.1% initial tolerance and 100 ppm/°C tempco across this full range.
Does LM4040QEEM3-2.5/NOPB require an output capacitor?
No, the LM4040QEEM3-2.5/NOPB does not require an output capacitor due to its internally compensated shunt architecture. It remains stable with capacitive loads up to 10 nF and eliminates need for external stabilization components-reducing bill-of-materials cost and PCB area. This feature is confirmed in TI's datasheet Section 3 and Figure 8-1.
What is the minimum cathode current needed for LM4040QEEM3-2.5/NOPB to regulate?
The LM4040QEEM3-2.5/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 65 μA. Below this threshold, output voltage deviates from 2.5V and dynamic impedance rises significantly-verified in Electrical Characteristics Table 5.8.
Is LM4040QEEM3-2.5/NOPB pin-compatible with other LM4040 variants in SOT-23?
Yes, all LM4040 variants in SOT-23 (DBZ) package-including LM4040AIM3-2.5, LM4040BIM3-2.5, and LM4040QEEM3-2.5/NOPB-share identical pinout: Cathode (Pin 1), Anode (Pin 2), NC (Pin 3). Mechanical dimensions and solder pad layout are fully interchangeable, enabling drop-in replacement across tolerance grades and automotive qualification levels.
How does LM4040QEEM3-2.5/NOPB achieve low temperature coefficient?
The LM4040QEEM3-2.5/NOPB uses bandgap reference temperature drift curvature correction combined with Zener-zap trimming to flatten the voltage vs. temperature curve. This results in ≤100 ppm/°C average tempco over −40°C to +125°C-validated in Table 5.8 and Typical Characteristics Figure 5-1. The LM4040QEEM3-2.5/NOPB achieves this without external components or calibration.
LM4040QEEM3-2.5/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:
- 73 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040QEEM3-2.5/NOPB FAQ
1.How can I place an order for LM4040QEEM3-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040QEEM3-2.5/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 LM4040QEEM3-2.5/NOPB reliable?
The price and inventory of LM4040QEEM3-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040QEEM3-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4040QEEM3-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040QEEM3-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040QEEM3-2.5/NOPB?
LM4040QEEM3-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040QEEM3-2.5/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 LM4040QEEM3-2.5/NOPB?
For technical support, including LM4040QEEM3-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040QEEM3-2.5/NOPB requirements.
6.How does Aetrix verify that LM4040QEEM3-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4040QEEM3-2.5/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 LM4040QEEM3-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4040QEEM3-2.5/NOPB?
All LM4040QEEM3-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4040QEEM3-2.5/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 LM4040QEEM3-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4040QEEM3-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040QEEM3-2.5/NOPB Tags
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