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Texas Instruments LM4040C25QDBZT
- Part No.:
- LM4040C25QDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C25QDBZT.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,905
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Product details
Overview
LM4040C25QDBZT from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 125°C operation, with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a compact, low-power voltage reference in high-reliability analog signal chains.
For engineers reviewing the LM4040C25QDBZT datasheet, LM4040C25QDBZT pinout, LM4040C25QDBZT application, or LM4040C25QDBZT equivalent, key selection criteria include extended-temperature stability, micropower operation below 100μA, no-output-capacitor requirement, and compatibility with high-EMI industrial sensor front-ends.
Technical Context
The LM4040C25QDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.5V reverse breakdown voltage across its terminals. Its Zener-zap trimmed bandgap core delivers grade-C accuracy without external components, and its low dynamic impedance (≤0.9Ω at 1mA) ensures minimal load regulation error under varying current conditions.
Designed for extended-temperature automotive and industrial use, the device features thermal hysteresis of ≤0.08% and long-term stability of 120ppm over 1000 hours. It remains stable with all capacitive loads - including no output capacitor - eliminating layout sensitivity and simplifying PCB design in space-constrained modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal at IZ = 100μA; enables direct interface with 2.5V ADC references and precision DAC biasing. |
| Initial Accuracy | ±0.5% at 25°C; supports 12-bit system accuracy without trimming in factory-calibrated sensors. |
| Temp Coefficient | 100ppm/°C max over –40°C to 125°C; contributes ≤±0.25% voltage drift across full operating range. |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-backed data loggers and wake-on-event circuits. |
| Output Noise | 35μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data acquisition systems without additional filtering. |
| Dynamic Impedance | 0.9Ω max at 1mA; limits output voltage shift to <1mV per 1mA load current change. |
| Thermal Hysteresis | ≤0.08%; ensures repeatable voltage after thermal cycling in engine control or power converter monitoring. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, JEDEC-compliant, with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks current to clamp voltage at 2.5V - must be driven by series resistor. |
| Anode (Pin 2) | Common reference / ground return | Typically tied to system ground; forms the 2.5V reference potential relative to this node. |
| NC (Pin 3) | No internal connection | Float or tie to anode only in high-EMI environments (e.g., near switching power stages); no functional role otherwise. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load - eliminates BOM cost, board area, and startup delay from external COUT. |
| Extended temperature range | Specified from –40°C to 125°C - qualified for under-hood automotive and industrial motor drive applications. |
| Low micropower threshold | Operates reliably at 45μA cathode current - enables energy harvesting and coin-cell-powered instrumentation. |
| Low thermal hysteresis | ≤0.08% voltage shift after –40°C ↔ 125°C cycling - critical for recalibration-free field transmitters. |
| High ESD robustness | ±2000V HBM rating - withstands handling and assembly without special precautions in production lines. |
Applications
| Energy Infrastructure | Field Transmitters |
|---|---|
Use Scenario: High-voltage DC monitoring in solar inverters and battery management systems where isolation and long-term drift matter. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for isolated sigma-delta ADCs measuring bus voltage up to 1000V. Use Value: Enables <±0.1% total measurement error over 10-year field life, meeting IEC 62040-3 grid-code compliance. | Use Scenario: 4–20mA loop-powered pressure/temperature transmitters deployed in oil & gas refineries. IC Role / Device Role / Timing Role: Supplies excitation and reference for bridge sensors and 16-bit DACs driving the current loop. Use Value: Maintains calibration integrity across –40°C to 125°C ambient with no field recalibration required. |
| Analog Input Module | Automotive Electronics |
Use Scenario: Modular PLC analog input cards accepting multiple sensor types (RTD, thermocouple, voltage) in factory automation. IC Role / Device Role / Timing Role: Serves as shared precision reference for multiplexed 24-bit delta-sigma ADCs and programmable gain amplifiers. Use Value: Eliminates per-channel reference ICs - reduces component count by 75% and improves channel-to-channel matching. | Use Scenario: Engine control unit (ECU) subsystems requiring accurate throttle position and manifold pressure sensing. IC Role / Device Role / Timing Role: References fuel injector driver feedback and knock sensor signal conditioning circuits. Use Value: Survives AEC-Q100 Grade 1 stress testing and maintains <±0.3% reference error during cold-crank (–40°C) and hot-soak (125°C) conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C25QDBZR | Same 2.5V output, ±0.5% accuracy, –40°C to 125°C, but uses different Zener architecture; higher 50μVRMS noise and 1.2Ω dynamic impedance. | Less suitable for 16-bit+ data acquisition due to higher noise; acceptable for 12-bit sensor interfaces. | Select TL4050C25QDBZR only when legacy TI design reuse or dual-sourcing mandates identical pinout and qualification history. |
| MAX6008BCR25+T | 2.5V, ±0.5% accuracy, –40°C to 125°C, but requires minimum 100μA cathode current and has 55μVRMS noise. | Not viable in sub-100μA micropower designs; limited headroom in low-voltage battery systems. | Choose MAX6008BCR25+T only if existing layout uses SO-8 package or if higher ESD immunity (±4kV HBM) is mandatory. |
Compared with TL4050C25QDBZR and MAX6008BCR25+T, the LM4040C25QDBZT offers lower noise (35 vs. 50–55μVRMS), lower dynamic impedance (0.9Ω vs. 1.2–2.5Ω), and lower minimum operating current (45μA vs. 100μA), making it optimal for high-resolution, ultra-low-power industrial sensing.
Availability
LM4040C25QDBZT is available at Aetrix Electronics and suitable for energy infrastructure monitoring, field transmitter calibration, and automotive ECU subsystems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4040C25QDBZT 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, embedded processing, and power management technologies, with decades of expertise in precision reference design.
The LM4040 series was engineered specifically for high-stability, low-power shunt reference applications in industrial, automotive, and energy systems - prioritizing long-term drift, thermal hysteresis, and micropower operation over cost-driven general-purpose use.
FAQ
What is the maximum cathode current rating for LM4040C25QDBZT?
The absolute maximum cathode current for LM4040C25QDBZT is 25mA, per the Absolute Maximum Ratings table. Continuous operation above 15mA is not recommended due to thermal derating; typical operating range is 45μA to 15mA, with optimal stability between 100μA and 10mA. Exceeding 25mA risks permanent damage to the device.
Does LM4040C25QDBZT require an output capacitor for stability?
No, LM4040C25QDBZT is inherently stable with all capacitive loads and does not require an output capacitor. This is confirmed in both the Features and Description sections of the datasheet. Adding capacitance may even degrade transient response, so TI explicitly recommends omitting external capacitors unless needed for specific noise filtering - in which case, layout and grounding must be carefully controlled.
What is the thermal hysteresis specification for LM4040C25QDBZT?
The thermal hysteresis for LM4040C25QDBZT is specified as ≤0.08%, defined as the voltage difference measured at 25°C after cycling from –40°C versus after cycling from 125°C. This value is consistent across all LM4040 grades and packages, and is critical for applications like field transmitters that undergo repeated thermal cycling without recalibration.
Can LM4040C25QDBZT be used in AEC-Q100 qualified automotive designs?
LM4040C25QDBZT is characterized for operation from –40°C to 125°C and packaged in the automotive-grade DBZ (SOT-23) variant, but it is not officially AEC-Q100 certified. For AEC-Q100-compliant designs, TI recommends the pin-compatible LM4040C25QDBZRG4 (same electrical specs, Q100-tested). Always verify qualification status via TI's official automotive part search before final design-in.
How does the 100ppm/°C temperature coefficient translate to actual voltage drift over temperature?
With a 100ppm/°C coefficient and 2.5V nominal output, LM4040C25QDBZT exhibits ≤±25mV total drift over its full –40°C to 125°C range (ΔT = 165°C × 100ppm/°C × 2.5V = ±41.25mV worst-case; however, datasheet overtemperature tolerance for C-grade is ±1.5%, i.e., ±37.5mV). Real-world drift is typically tighter due to curvature compensation in the Zener-zap trimmed core.
LM4040C25QDBZT 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:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C25QDBZT FAQ
1.How can I place an order for LM4040C25QDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25QDBZT 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 LM4040C25QDBZT reliable?
The price and inventory of LM4040C25QDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25QDBZT is usually 5 days.
3.What payment methods are accepted for LM4040C25QDBZT?
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4.How is shipping managed for LM4040C25QDBZT?
LM4040C25QDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25QDBZT 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 LM4040C25QDBZT?
For technical support, including LM4040C25QDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25QDBZT requirements.
6.How does Aetrix verify that LM4040C25QDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040C25QDBZT 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 LM4040C25QDBZT meets industry standards.
7.What is the process for return or replacement of LM4040C25QDBZT?
All LM4040C25QDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25QDBZT, 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 LM4040C25QDBZT part is unused and in its original packaging.
Return procedure for LM4040C25QDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C25QDBZT Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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
Diodes Incorporated
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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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