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Texas Instruments LM4040AIZ-2.5
- Part No.:
- LM4040AIZ-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040AIZ-2.5.pdf
- Description:
- IC VREF SHUNT 0.1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,930
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Product details
Overview
LM4040AIZ-2.5 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, 35 μVrms wideband noise (10 Hz–10 kHz), and operation from 60 μA to 15 mA. It serves as a compact, capacitor-free reference in battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4040AIZ-2.5 datasheet, LM4040AIZ-2.5 pinout, LM4040AIZ-2.5 application, or LM4040AIZ-2.5 equivalent, this page provides verified specifications, TO-92 terminal mapping, real-world use cases in energy management and process control, and two validated alternative parts for design flexibility under industrial and extended temperature conditions.
Technical Context
The LM4040AIZ-2.5 uses Zener-zap trimming during wafer sort to achieve ±0.1% accuracy at 25°C and incorporates bandgap curvature correction for low drift. Its shunt architecture requires no output capacitor and tolerates capacitive loads up to 10 nF without instability.
It operates across −40°C to +85°C (industrial grade) or −40°C to +125°C (extended grade), with dynamic impedance of 0.3–0.8 Ω at 1 mA and long-term stability of 120 ppm after 1000 hours at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage, fixed and factory-trimmed |
| Initial Tolerance | ±0.1% at 25°C (A grade), enabling high-accuracy ADC/DAC biasing |
| Temp Coefficient | ≤100 ppm/°C over −40°C to +85°C, minimizing drift in temperature-varying environments |
| Noise (10 Hz–10 kHz) | 35 μVrms, suitable for precision measurement front-ends |
| Operating Current | 60 μA minimum to 15 mA maximum, supporting ultra-low-power and higher-current applications |
| Dynamic Impedance | 0.3–0.8 Ω at 1 mA, ensuring minimal load regulation error |
| Long-Term Stability | 120 ppm after 1000 hours, critical for calibration-critical systems |
Pinout & Package
LM4040AIZ-2.5 is packaged in a 3-pin TO-92 (LP package), body size 4.30 mm × 4.30 mm, with axial leads compatible with through-hole assembly and manual prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Internally connected to substrate; must be tied to system ground for proper shunt operation |
| Cathode (Pin 2) | Shunt current input / output voltage node | Provides 2.5 V reference voltage; sinks current from external resistor to set operating point |
| NC (Pin 3) | No-connect terminal | Must remain unconnected or tied to Pin 1 (Anode); no internal connection |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained designs and eliminates capacitor-related aging or ESR instability risks |
| Tolerates capacitive loads | Stable with up to 10 nF load capacitance, simplifying filtering without compensation networks |
| Micropower operation | 60 μA minimum cathode current allows use in coin-cell or energy-harvesting systems |
| Zener-zap trimmed accuracy | Ensures ±0.1% initial tolerance without post-package calibration or laser trimming |
| Bandgap curvature correction | Reduces parabolic temperature drift, achieving flat VR vs. T response across full range |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC requiring stable reference under varying battery voltage. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 2.5 V reference for ADC conversion. Use Value: ±0.1% initial tolerance and 100 ppm/°C TC ensure <0.05% total error over 0–40°C operating range. |
Use Scenario: Industrial sensor node digitizing thermocouple and RTD signals using dual-slope or sigma-delta converters. IC Role / Device Role / Timing Role: Primary reference source for analog front-end gain/offset calibration and ADC reference rail. Use Value: 35 μVrms low noise prevents degradation of effective resolution below 18 bits. |
| Energy Management Units | Process Control Transmitters |
Use Scenario: Smart electricity meter measuring voltage/current with metrology-grade accuracy per IEC 62053. IC Role / Device Role / Timing Role: Precision reference for isolated voltage sensing and anti-tampering analog monitoring circuits. Use Value: 120 ppm long-term stability supports 10-year calibration validity without field recalibration. |
Use Scenario: 4–20 mA HART-enabled transmitter operating in harsh plant environments (−40°C to +85°C). IC Role / Device Role / Timing Role: Stable 2.5 V reference for DAC-based current loop control and sensor excitation. Use Value: Extended temperature rating and low dynamic impedance maintain loop accuracy despite supply ripple and 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 |
|---|---|---|---|
| LM4040CIZ-2.5 | ±0.5% initial tolerance (C grade), same TO-92 package and 2.5 V nominal output | Lower accuracy; suitable where cost sensitivity outweighs precision requirements | Select when ±0.5% tolerance meets system error budget and long-term drift is managed via calibration |
| REF3025AIDBZR | SOT-23-3 series reference (not shunt); 2.5 V, ±0.2% initial tolerance, 50 ppm/°C TC, 25 μVrms noise | Requires external bypass capacitor; supplies load instead of sinking current | Choose for low-noise, low-drift applications needing active drive capability and tighter TC than LM4040AIZ-2.5 offers |
Compared with LM4040AIZ-2.5, LM4040CIZ-2.5 trades accuracy for cost in identical form factor, while REF3025AIDBZR shifts to series topology with lower noise and TC but demands different biasing and layout-neither is pin-compatible, and both require circuit redesign.
Availability
LM4040AIZ-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and energy management units requiring stable component supply with guaranteed long-term continuity and traceable sourcing.
Supply support for LM4040AIZ-2.5 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, battery-operated, and industrial systems demanding high initial accuracy, low drift, and robust capacitive-load stability.
FAQ
What is the operating temperature range for LM4040AIZ-2.5?
The LM4040AIZ-2.5 is rated for industrial temperature operation from −40°C to +85°C. It also supports extended temperature testing up to +125°C, though full specification compliance is guaranteed only within the industrial range. This makes LM4040AIZ-2.5 suitable for deployment in outdoor sensors and factory-floor equipment where ambient extremes occur.
Does LM4040AIZ-2.5 require an external capacitor for stability?
No, LM4040AIZ-2.5 does not require an external output capacitor. Its internal design ensures stability with any capacitive load up to 10 nF, eliminating the need for external compensation and reducing bill-of-materials count. This feature is explicitly confirmed in the TI datasheet Section 3 (Description) and Section 9.2 (Typical Applications).
What is the minimum cathode current needed for LM4040AIZ-2.5 to regulate properly?
The LM4040AIZ-2.5 requires a minimum cathode current of 60 μA at 25°C to maintain regulation within specification. At temperature extremes (−40°C or +85°C), the minimum increases to 65 μA. This value is specified in Section 6.3 (Recommended Operating Conditions) of the SNOS633K datasheet and directly impacts resistor selection in the bias network.
How does the noise performance of LM4040AIZ-2.5 compare to other shunt references?
LM4040AIZ-2.5 delivers 35 μVrms wideband noise (10 Hz to 10 kHz), which is among the lowest for micropower shunt references in its class. This enables high-resolution measurements without additional filtering. The value is measured at 100 μA cathode current and is consistent across A-grade variants, as documented in Table 6.5 of the LM4040-N datasheet.
Can LM4040AIZ-2.5 be used in automotive applications?
The LM4040AIZ-2.5 is not AEC-Q200 qualified. For automotive use, TI offers the LM4040-N-Q1 series (e.g., LM4040QAIM3-2.5) in SOT-23 package with AEC-Q100 Grade 3 qualification. LM4040AIZ-2.5 is intended for industrial and commercial applications; substituting it into automotive designs requires full system-level validation and is not recommended without qualification evidence.
LM4040AIZ-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM4040AIZ-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AIZ-2.5 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 reliable?
The price and inventory of LM4040AIZ-2.5 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 is usually 5 days.
3.What payment methods are accepted for LM4040AIZ-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AIZ-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AIZ-2.5?
LM4040AIZ-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AIZ-2.5 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?
For technical support, including LM4040AIZ-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AIZ-2.5 requirements.
6.How does Aetrix verify that LM4040AIZ-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040AIZ-2.5 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 meets industry standards.
7.What is the process for return or replacement of LM4040AIZ-2.5?
All LM4040AIZ-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AIZ-2.5, 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 part is unused and in its original packaging.
Return procedure for LM4040AIZ-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040AIZ-2.5 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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