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Texas Instruments LM4040CEM3-2.5/NOPB
- Part No.:
- LM4040CEM3-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CEM3-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,413
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Product details
Overview
LM4040CEM3-2.5/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 ±12 mV (±0.48%) 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.
For engineers reviewing the LM4040CEM3-2.5/NOPB datasheet, LM4040CEM3-2.5/NOPB pinout, LM4040CEM3-2.5/NOPB application, or LM4040CEM3-2.5/NOPB equivalent, key selection criteria include industrial-grade temperature range, low-noise performance in data acquisition front-ends, tight initial tolerance for calibration circuits, and capacitive-load stability in space-constrained analog modules.
Technical Context
The LM4040CEM3-2.5/NOPB uses Zener-zap trimming during wafer sort to achieve ±12 mV initial accuracy and incorporates bandgap-derived curvature correction for stable voltage over temperature. Its low dynamic impedance (≤0.9 Ω) ensures minimal load regulation error across its 60 μA–15 mA operating current range.
Designed as a two-terminal shunt reference, it functions by sinking current through its cathode to maintain 2.5 V across an external load/resistor network. The device tolerates unlimited capacitive loads without oscillation and exhibits 0.08% thermal hysteresis after −40°C/125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage - sets precise bias point for ADC references, sensor excitation, and analog signal conditioning. |
| Initial Tolerance | ±12 mV (±0.48%) at 25°C - enables single-point calibration in field transmitters and energy metering without trimming. |
| Temp Coefficient | ≤100 ppm/°C - ensures ≤±19 mV total drift over −40°C to +85°C, critical for industrial temperature stability. |
| Noise (10Hz–10kHz) | 35 μVrms - supports high-resolution (16+ bit) data acquisition without added filtering. |
| Operating Current | 60 μA to 15 mA - allows ultra-low-power operation in battery-powered sensors and full-drive capability in active filter bias networks. |
| Dynamic Impedance | ≤0.9 Ω - minimizes output voltage shift under varying load currents, improving regulation in variable-current applications. |
Pinout & Package
LM4040CEM3-2.5/NOPB is housed in a 3-pin SOT-23 (DBZ) package with 2.92 mm × 1.30 mm body size. Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is NC (no connect, must float or tie to Anode per TI layout guidance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Shunt current input / voltage output node | Connects to supply rail via series resistor; voltage develops across external load referenced to Anode. |
| Pin 2 (Anode) | Reference ground terminal | Typically tied to system ground; defines 0 V reference for 2.5 V output at Cathode. |
| Pin 3 (NC) | No-connect terminal | Must remain unconnected or bonded to Anode; not electrically functional but aids EMI immunity when grounded. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables direct integration into compact PCB layouts without stability-compensation components. |
| Capacitive-load tolerant | Stable with any value of output capacitance - eliminates risk of oscillation in noisy environments or long trace runs. |
| Zener-zap trimmed accuracy | Guarantees ±12 mV initial tolerance without post-package calibration, reducing test time and cost. |
| Low 35 μVrms noise | Preserves SNR in precision measurement paths where reference noise directly limits ADC effective resolution. |
| −40°C to +85°C operation | Validated for industrial ambient conditions without derating - suitable for DIN-rail controllers and outdoor instrumentation. |
Applications
| Field Transmitters | Data Acquisition |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter with HART modulation. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V for DAC output scaling and sensor bridge excitation. Use Value: ±12 mV initial tolerance and 100 ppm/°C TC enable <1 LSB error over full temperature range in 16-bit systems. | Use Scenario: Isolated analog input module for PLC backplane with ±10 V input range. IC Role / Device Role / Timing Role: Precision reference for 24-bit sigma-delta ADC front-end and anti-aliasing filter biasing. Use Value: 35 μVrms noise contributes <0.005% of full-scale noise floor, preserving ENOB in high-dynamic-range measurements. |
| Analog Input Module | Energy Infrastructure |
Use Scenario: Modular I/O card with multiple channel-specific gain/offset calibration. IC Role / Device Role / Timing Role: Local reference per channel to eliminate crosstalk and routing-induced errors. Use Value: SOT-23 footprint allows per-channel placement, minimizing trace inductance and ground bounce in multi-channel designs. | Use Scenario: Revenue-grade electricity meter with metrology ASIC and isolated power supply. IC Role / Device Role / Timing Role: Primary reference for polyphase energy measurement IC requiring long-term stability. Use Value: 120 ppm long-term drift (1000 hrs) and 0.08% thermal hysteresis ensure calibration retention between utility-mandated recalibrations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040DIM3-2.5/NOPB | ±25 mV (±1.0%) initial tolerance, same 100 ppm/°C TC and noise | Lower accuracy grade suitable for non-critical biasing or cost-sensitive consumer-grade meters | Select when ±1% reference accuracy suffices and BOM cost reduction is prioritized over calibration headroom. |
| REF3025AIDBZR | 2.5 V series reference, 50 ppm/°C TC, 28 μVrms noise, 50 μA quiescent current | Requires input voltage ≥2.7 V; not shunt-based - incompatible with floating or high-side sensing topologies | Choose only if system architecture permits series-reference topology and tighter TC/noise justify higher cost and layout redesign. |
Compared with LM4040DIM3-2.5/NOPB, the LM4040CEM3-2.5/NOPB provides 2× better initial accuracy for calibration-critical roles; versus REF3025AIDBZR, it retains shunt flexibility and lower minimum operating current but trades 20 ppm/°C TC and 7 μVrms noise for topology compatibility.
Availability
LM4040CEM3-2.5/NOPB is available at Aetrix Electronics and suitable for field transmitters, data acquisition systems, and energy infrastructure equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4040CEM3-2.5/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 voltage references optimized for industrial and automotive applications demanding high accuracy, low noise, and robust thermal performance in miniature packages.
FAQ
What is the maximum operating current for LM4040CEM3-2.5/NOPB?
The LM4040CEM3-2.5/NOPB supports a maximum operating current of 15 mA across its full temperature range. This rating is defined in Section 5.3 of the datasheet and reflects the upper limit before exceeding absolute maximum power dissipation in the SOT-23 package. Exceeding 15 mA risks thermal overstress and parametric degradation. The LM4040CEM3-2.5/NOPB maintains specified accuracy and stability within this bound.
Does LM4040CEM3-2.5/NOPB require an external capacitor for stability?
No, the LM4040CEM3-2.5/NOPB does not require an external output capacitor for stability. Its internal design eliminates the need for stabilization components while remaining immune to oscillation with any capacitive load - a key advantage over older shunt references. This feature simplifies layout and reduces BOM count in space-constrained applications like handheld test equipment and modular I/O cards using LM4040CEM3-2.5/NOPB.
What is the temperature coefficient specification for LM4040CEM3-2.5/NOPB?
The LM4040CEM3-2.5/NOPB has a maximum average temperature coefficient of 100 ppm/°C over the −40°C to +85°C industrial temperature range. This value is verified per Section 5.9 of the datasheet and represents the worst-case drift slope across temperature extremes. At 2.5 V, this equates to ±19 mV total variation over the full range, enabling predictable error budgeting in precision analog signal chains using LM4040CEM3-2.5/NOPB.
Can LM4040CEM3-2.5/NOPB be used in automotive applications?
The LM4040CEM3-2.5/NOPB is rated for industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. For automotive applications, TI offers the LM4040CQEM3-2.5/NOPB (Q1 variant), which meets AEC-Q100 Grade 3 requirements. Using LM4040CEM3-2.5/NOPB in automotive contexts may violate qualification requirements unless fully validated per customer-specific reliability protocols - LM4040CEM3-2.5/NOPB is intended for industrial use only.
What is the wideband noise performance of LM4040CEM3-2.5/NOPB?
The LM4040CEM3-2.5/NOPB delivers 35 μVrms wideband noise over the 10 Hz to 10 kHz frequency range, as specified in Section 5.8 of the datasheet. This low-noise characteristic is measured at 100 μA operating current and directly impacts high-resolution data acquisition systems. In 24-bit ADC designs, this noise level contributes less than 0.005% of full-scale error, making LM4040CEM3-2.5/NOPB suitable for metrology-grade instrumentation.
LM4040CEM3-2.5/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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 68 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CEM3-2.5/NOPB FAQ
1.How can I place an order for LM4040CEM3-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEM3-2.5/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 LM4040CEM3-2.5/NOPB reliable?
The price and inventory of LM4040CEM3-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEM3-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4040CEM3-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEM3-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEM3-2.5/NOPB?
LM4040CEM3-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEM3-2.5/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 LM4040CEM3-2.5/NOPB?
For technical support, including LM4040CEM3-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEM3-2.5/NOPB requirements.
6.How does Aetrix verify that LM4040CEM3-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4040CEM3-2.5/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 LM4040CEM3-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4040CEM3-2.5/NOPB?
All LM4040CEM3-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEM3-2.5/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 LM4040CEM3-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4040CEM3-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CEM3-2.5/NOPB Tags
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