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Texas Instruments LM4040A25IDBZTG4
- Part No.:
- LM4040A25IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A25IDBZTG4.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,724
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Product details
Overview
LM4040A25IDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference with 2.5V nominal output, ±2.5mV (0.1%) initial tolerance at 25°C, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a high-accuracy voltage reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040A25IDBZTG4 datasheet, LM4040A25IDBZTG4 pinout, LM4040A25IDBZTG4 application, or LM4040A25IDBZTG4 equivalent, key selection criteria include initial accuracy, thermal stability over –40°C to 85°C, low-noise performance in battery-powered instrumentation, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040A25IDBZTG4 operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 2.5V reverse breakdown voltage across its terminals. Its Zener-zap trimmed bandgap architecture delivers tight initial tolerance and low temperature drift without requiring external components.
It features low dynamic impedance (≤0.8Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm after 1000 hours. The device is characterized for industrial temperature range (–40°C to +85°C) and packaged in SOT-23-3 (DBZ) with anode, cathode, and floating terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal at 100μA cathode current; enables accurate 2.5V biasing for 12-bit+ ADCs and DACs |
| Initial Tolerance | ±2.5mV (0.1%) at 25°C; supports high-precision calibration without trimming |
| Temp Coefficient | 100ppm/°C max over –40°C to +85°C; ensures ≤±19mV total drift across full operating range |
| Noise (10Hz–10kHz) | 35μVRMS typical; minimizes voltage reference contribution to system noise floor |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in energy-harvesting and portable systems |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA; maintains regulation under fast load transients |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycling; preserves repeatability in thermally cycled environments |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to regulated supply rail; sinks current to establish 2.5V reference potential |
| Anode (Pin 2) | Common return / ground reference | Typically tied to system ground; forms reference return path for all connected circuitry |
| NC (Pin 3) | No internal connection | Must float or be connected to anode per EMI mitigation guidance; no functional role in regulation |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | No output capacitor required - simplifies layout and eliminates capacitor-related drift or instability |
| Wide operating current range | 45μA to 15mA cathode current - supports both ultra-low-power sensing and higher-current reference buffering |
| Low temperature coefficient | 100ppm/°C max - ensures <±0.2% output variation across industrial temperature range |
| Low wideband noise | 35μVRMS (10Hz–10kHz) - critical for high-resolution data acquisition where reference noise limits ENOB |
| Fuse/Zener-zap voltage trim | Wafer-level trimming achieves 0.1% grade accuracy - eliminates post-package calibration cost |
Applications
| Industrial Data Acquisition | Energy Infrastructure Monitoring |
|---|---|
Use Scenario: High-accuracy voltage measurement in DIN-rail mounted power quality analyzers. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for 16-bit sigma-delta ADC front-end. Use Value: Enables ±0.05% full-scale measurement accuracy over –25°C to +70°C ambient. |
Use Scenario: Battery voltage monitoring in solar microinverters with wide temperature swings. IC Role / Device Role / Timing Role: Supplies reference for isolated ADC measuring DC-link voltage. Use Value: Maintains <±0.1% error across –40°C to +85°C, supporting UL 1741 compliance. |
| Field Transmitter Signal Conditioning | Precision Audio Level Detection |
Use Scenario: 4–20mA loop-powered pressure transmitter with HART modulation. IC Role / Device Role / Timing Role: Sets gain and offset in analog signal chain before current loop driver. Use Value: Delivers 0.1% initial accuracy and <10ppm/°C effective drift after PCB thermal design, meeting IEC 61290-1. |
Use Scenario: RMS level detector in studio-grade audio metering with LED bar graph display. IC Role / Device Role / Timing Role: Reference for logarithmic converter IC converting AC audio envelope to DC. Use Value: 35μVRMS noise ensures <0.01dB measurement resolution at 1kHz, avoiding audible stepping artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5V, 0.2% initial accuracy, 50ppm/°C, 25μVRMS noise, 50μA min current, SOT-23-3 | Lower noise and tempco but looser initial tolerance; requires higher minimum current | Preferred when ultra-low noise dominates over initial calibration burden |
| ADR3425ARJZ-R7 | 2.5V, 0.1% initial accuracy, 10ppm/°C, 12μVRMS noise, 100μA min current, SOT-23-5 | Superior tempco and noise, but higher minimum current and 5-pin package | Selected for aerospace-grade stability where layout space permits 5-pin variant |
Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4040A25IDBZTG4 offers the lowest minimum operating current (45μA) and proven robustness with capacitive loads - making it optimal for space-constrained, ultra-low-power industrial sensors where board area and quiescent current are primary constraints.
Availability
LM4040A25IDBZTG4 is available at Aetrix Electronics and suitable for industrial data acquisition, energy infrastructure monitoring, and field transmitter applications requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4040A25IDBZTG4 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in industrial, automotive, and instrumentation systems - emphasizing ease of use, stability, and grade-based cost-performance scalability.
FAQ
What is the operating temperature range for LM4040A25IDBZTG4?
The LM4040A25IDBZTG4 is characterized for industrial temperature range: –40°C to +85°C. Its electrical specifications - including 0.1% initial tolerance and 100ppm/°C temperature coefficient - are guaranteed across this full range. The device uses wafer-level Zener-zap trimming to achieve grade-A accuracy without derating.
Does LM4040A25IDBZTG4 require an output capacitor?
No, LM4040A25IDBZTG4 is stable with all capacitive loads and does not require an output capacitor. This eliminates capacitor-related aging, leakage, and temperature drift effects - a key advantage over series references. The internal design ensures phase margin remains sufficient even with >10µF ceramic or tantalum capacitance on the cathode node.
What is the minimum cathode current needed for LM4040A25IDBZTG4 to regulate?
The LM4040A25IDBZTG4 requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation. At full temperature range (–40°C to +85°C), the maximum specified minimum current is 80μA. Below this threshold, output voltage deviates from specification; above 15mA, power dissipation must be managed per thermal limits.
How does the NC pin (Pin 3) function in LM4040A25IDBZTG4?
In LM4040A25IDBZTG4, Pin 3 is a no-connect terminal with no internal bond wire. TI recommends leaving it floating or connecting it directly to the anode (Pin 2) - especially in high-EMI environments near transformers or switching regulators - to reduce susceptibility to noise coupling into the reference node.
What is the long-term stability of LM4040A25IDBZTG4?
The LM4040A25IDBZTG4 exhibits 120ppm long-term stability after 1000 hours of operation at 25°C with 100μA cathode current. This value reflects parametric shift due to silicon aging and is measured under controlled conditions; real-world drift in properly designed circuits typically remains below 50ppm over 5 years.
LM4040A25IDBZTG4 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:
- Discontinued at Digi-Key
- 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:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040A25IDBZTG4 FAQ
1.How can I place an order for LM4040A25IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A25IDBZTG4 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 LM4040A25IDBZTG4 reliable?
The price and inventory of LM4040A25IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A25IDBZTG4 is usually 5 days.
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LM4040A25IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040A25IDBZTG4 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 LM4040A25IDBZTG4?
For technical support, including LM4040A25IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A25IDBZTG4 requirements.
6.How does Aetrix verify that LM4040A25IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040A25IDBZTG4 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 LM4040A25IDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040A25IDBZTG4?
All LM4040A25IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A25IDBZTG4, 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 LM4040A25IDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040A25IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A25IDBZTG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-4.1-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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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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