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Texas Instruments LM4040AIZ-2.5/NOPB
- Part No.:
- LM4040AIZ-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040AIZ-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 0.1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:221
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Product details
Overview
LM4040AIZ-2.5/NOPB from Texas Instruments is a precision micropower shunt voltage reference in TO-92 package, delivering a stable 2.5 V reverse breakdown voltage with ±0.1% initial tolerance (A grade) 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 in analog input modules, field transmitters, and energy infrastructure for high-accuracy ADC/DAC biasing.
For engineers reviewing the LM4040AIZ-2.5/NOPB datasheet, LM4040AIZ-2.5/NOPB pinout, LM4040AIZ-2.5/NOPB application, or LM4040AIZ-2.5/NOPB equivalent, key selection criteria include industrial-grade temperature stability, low quiescent current operation, shunt topology compatibility with capacitive loads, and TO-92 through-hole mounting for legacy or high-reliability board designs.
Technical Context
The LM4040AIZ-2.5/NOPB implements a trimmed Zener-based shunt reference architecture with fuse-and-Zener-zap wafer-level trimming to achieve ±0.1% initial accuracy. Its bandgap-derived temperature drift curvature correction enables stable 2.5 V output across −40°C to +85°C with ≤100 ppm/°C TC.
It features low dynamic impedance (0.3–0.8 Ω), tolerates unlimited capacitive loading without oscillation, and maintains regulation down to 60 μA minimum cathode current - eliminating need for external stabilization components in space-constrained analog signal chains.
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 ADC references or sensor excitation circuits. |
| Initial Tolerance | ±0.1% at 25°C (A grade) - ensures ≤±2.5 mV absolute error before temperature or load effects. |
| Temp Coefficient | ≤100 ppm/°C (max) over −40°C to +85°C - contributes ≤±16.25 mV drift across full industrial range. |
| Noise (10 Hz–10 kHz) | 35 μVrms typical - supports high-resolution data acquisition without added filtering overhead. |
| Operating Current | 60 μA to 15 mA - enables ultra-low-power sensor nodes and robust operation under varying load conditions. |
| Dynamic Impedance | 0.3–0.8 Ω at 1 mA - minimizes output voltage shift during transient load changes in precision feedback paths. |
| Thermal Hysteresis | 0.08% - limits voltage memory effect after thermal cycling, critical for repeatable calibration in test equipment. |
Pinout & Package
LM4040AIZ-2.5/NOPB uses a 3-pin TO-92 package (body size 4.30 mm × 4.30 mm) with axial leads. Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is NC (no connect, must float or tie to Anode per TI recommendation for EMI-sensitive layouts).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / output node | Receives external current; regulates voltage between Cathode and Anode - connects to supply rail or divider network. |
| Anode (Pin 2) | Reference ground reference | Typically tied to system ground; defines 0 V reference for 2.5 V output at Cathode relative to this node. |
| NC (Pin 3) | No-connect terminal | Must remain unconnected or bonded to Anode (Pin 2); improves noise immunity in high-EMI environments when tied. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable operation with any capacitive load up to ∞ - eliminates BOM cost and layout area for stabilization caps. |
| Zener-zap wafer trimming | Ensures ±0.1% initial accuracy at 25°C without post-package calibration - reduces test time and yield loss. |
| Low 60 μA minimum operating current | Enables use in battery-powered field transmitters and IoT sensors where standby current is constrained. |
| Bandgap temperature drift correction | Delivers ≤100 ppm/°C TC over −40°C to +85°C - outperforms basic Zeners in industrial ambient variations. |
| TO-92 through-hole package | Provides mechanical robustness, thermal mass for power dissipation (550 mW @ 25°C), and legacy design compatibility. |
Applications
| Field Transmitter Calibration | Energy Infrastructure Metering |
|---|---|
Use Scenario: Precision 4–20 mA loop transmitter conditioning analog sensor signals (e.g., pressure, temperature) before current conversion. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V excitation and ADC reference for ratiometric measurement. Use Value: ±0.1% initial tolerance and ≤100 ppm/°C TC ensure <±0.2% total error over industrial temperature range without recalibration. |
Use Scenario: Revenue-grade electricity meter requiring traceable voltage reference for metrology-grade ADC sampling. IC Role / Device Role / Timing Role: Primary shunt reference for sigma-delta ADC front-end, rejecting supply ripple via high PSRR inherent to shunt topology. Use Value: 35 μVrms low-frequency noise directly limits effective resolution - enables >16-bit ENOB in Class 0.2 meters. |
| Analog Input Module | Automotive Sensor Interface |
Use Scenario: Modular PLC I/O card digitizing multiple 0–10 V or ±10 V analog inputs with shared precision reference. IC Role / Device Role / Timing Role: Central 2.5 V reference for multiplexed SAR ADCs and programmable gain instrumentation amplifiers. Use Value: Low dynamic impedance (0.3–0.8 Ω) prevents crosstalk-induced voltage droop during channel switching. |
Use Scenario: Engine control unit (ECU) interface for exhaust gas oxygen (EGO) or knock sensors demanding stable bias under thermal stress. IC Role / Device Role / Timing Role: Shunt reference supplying regulated 2.5 V to sensor signal conditioning circuitry in AEC-Q100 Grade 3 environment. Use Value: Qualified to −40°C to +85°C with 1000-hour long-term stability (120 ppm) - meets automotive reliability requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040CIZ-2.5/NOPB | ±0.5% initial tolerance (C grade), same TO-92 package and 2.5 V output | Lower accuracy; suitable for non-critical biasing where cost sensitivity outweighs precision | Select when ±0.5% tolerance and reduced test overhead justify trade-off vs. A-grade performance. |
| REF3025AIDBZR | SOT-23-3 series reference, 2.5 V, ±0.2% initial tolerance, 50 ppm/°C TC, 25 μVrms noise | Series topology requires output capacitor; higher accuracy but incompatible pinout and drive architecture | Choose for lower noise and tighter TC only if redesign allows series reference integration and PCB space permits SOT-23 footprint. |
Compared with LM4040CIZ-2.5/NOPB, the LM4040AIZ-2.5/NOPB delivers four times tighter initial tolerance (±0.1% vs. ±0.5%) at identical package and cost tier; versus REF3025AIDBZR, it offers shunt topology simplicity and TO-92 mechanical ruggedness but trades 10 ppm/°C TC and 10 μVrms noise for through-hole manufacturability and no capacitor dependency.
Availability
LM4040AIZ-2.5/NOPB is available at Aetrix Electronics and suitable for field transmitter calibration, energy infrastructure metering, and analog input module designs requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040AIZ-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 space-constrained industrial and automotive systems where accuracy, stability, and capacitor-free operation are essential.
FAQ
What is the maximum operating temperature range for LM4040AIZ-2.5/NOPB?
The LM4040AIZ-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 LM4040AIM3X or LM4040AEX variants in SOT-23 or SC70 packages. The TO-92 package (Z suffix) is specified only for the industrial grade per TI's official datasheet Section 5.3.
Does LM4040AIZ-2.5/NOPB require an output capacitor for stability?
No, the LM4040AIZ-2.5/NOPB does not require an output capacitor. Its internal design provides unconditional stability with any capacitive load, including direct connection to ADC reference inputs or large filter capacitors - a key advantage over many series references and older shunt devices.
What is the minimum cathode current needed for LM4040AIZ-2.5/NOPB to maintain regulation?
The LM4040AIZ-2.5/NOPB requires a minimum cathode current of 60 μA at 25°C to maintain regulation within specification. This value increases slightly to 65 μA across the full −40°C to +85°C range, as confirmed in Section 5.8 of the TI datasheet under "IRMIN" parameter.
How does the noise performance of LM4040AIZ-2.5/NOPB compare to other 2.5 V references?
The LM4040AIZ-2.5/NOPB delivers 35 μVrms wideband noise (10 Hz–10 kHz), matching the performance of TI's higher-grade LM4040B and LM4040C variants. This is competitive with most precision shunt references in its class and sufficient for 16-bit data acquisition without additional filtering.
Is LM4040AIZ-2.5/NOPB AEC-Q100 qualified?
No, the LM4040AIZ-2.5/NOPB is not AEC-Q100 qualified. It belongs to the standard LM4040-N family (industrial grade). For automotive applications, TI offers the LM4040AQxIY series (e.g., LM4040AQ25IDBZR) in SOT-23 with Grade 3 qualification (−40°C to +85°C), or LM4040AQxIY in SC70 for Grade 1 (−40°C to +125°C).
LM4040AIZ-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040AIZ-2.5/NOPB FAQ
1.How can I place an order for LM4040AIZ-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AIZ-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 LM4040AIZ-2.5/NOPB reliable?
The price and inventory of LM4040AIZ-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 LM4040AIZ-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4040AIZ-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AIZ-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AIZ-2.5/NOPB?
LM4040AIZ-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AIZ-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 LM4040AIZ-2.5/NOPB?
For technical support, including LM4040AIZ-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AIZ-2.5/NOPB requirements.
6.How does Aetrix verify that LM4040AIZ-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4040AIZ-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 LM4040AIZ-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4040AIZ-2.5/NOPB?
All LM4040AIZ-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AIZ-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 LM4040AIZ-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4040AIZ-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040AIZ-2.5/NOPB Tags
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TL431AIDBZR
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