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Texas Instruments LM4040D25IDBZT
- Part No.:
- LM4040D25IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D25IDBZT.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,658
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Product details
Overview
LM4040D25IDBZT from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation, with ±1.0% initial accuracy, 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a compact, low-power voltage reference in analog signal conditioning paths of industrial data-acquisition systems.
For engineers reviewing the LM4040D25IDBZT datasheet, LM4040D25IDBZT pinout, LM4040D25IDBZT application, or LM4040D25IDBZT equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and noise performance, and real-world application context for high-accuracy voltage referencing in space-constrained, low-current designs.
Technical Context
The LM4040D25IDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 2.5V reverse breakdown voltage across its cathode-anode terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming to achieve D-grade tolerance and supports operation over 45μA–15mA cathode current range without external capacitance.
It exhibits low dynamic impedance (≤1.1Ω at 1mA), minimal voltage drift with load current (≤10mV over 1mA–15mA), and thermal hysteresis of 0.08% - enabling stable reference performance in varying ambient conditions and intermittent power scenarios typical in field instrumentation and portable sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5V nominal at 100μA; enables precise ADC/DAC biasing and sensor excitation at standard logic-compatible level |
| Initial Accuracy | ±1.0% max at 25°C; defines worst-case DC offset in calibration-critical circuits before temperature compensation |
| Temp Coefficient | 150ppm/°C max; contributes ≤±0.195% error over –40°C to 85°C industrial range |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-backed or energy-harvested systems |
| Output Noise | 35μVRMS (10Hz–10kHz); supports <16-bit effective resolution in precision measurement front-ends |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures <1mV output shift per 1mA load transients, critical for stable feedback loops |
| Thermal Hysteresis | 0.08%; limits repeatability error after thermal cycling - essential for recalibration-free field deployments |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks all reference current; voltage referenced to anode |
| Anode (Pin 2) | Common return / ground reference | Typically tied to system ground; forms reference potential for cathode voltage |
| NC (Pin 3) | No internal connection | Must be left floating or tied to anode per EMI mitigation guidance in high-noise environments |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and PCB area in compact sensor modules |
| Wide operating current range | 45μA to 15mA operation enables use from ultra-low-power wake-up circuits to higher-current buffer stages |
| Low temperature coefficient | 150ppm/°C max ensures predictable drift behavior for embedded software temperature compensation |
| Low output noise | 35μVRMS supports high-resolution analog measurements without external filtering overhead |
| Extended temperature rating | –40°C to 85°C operation validated for industrial control cabinets and outdoor metering enclosures |
Applications
| Industrial Data-Acquisition Systems | Analog Input Modules |
|---|---|
Use Scenario: High-channel-count PLC analog input cards digitizing 4–20mA and 0–10V sensor signals. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for 16-bit SAR ADCs and programmable gain instrumentation amplifiers. Use Value: ±1.0% initial accuracy and 150ppm/°C TC ensure <±0.2% total unadjusted error over full temperature range without factory recalibration. |
Use Scenario: DIN-rail mounted analog I/O modules converting field signals to digital backplane buses. IC Role / Device Role / Timing Role: Serves as primary voltage reference for isolated sigma-delta ADCs and voltage-output DACs. Use Value: 45μA minimum cathode current enables direct biasing from isolated DC-DC converters with no additional LDO. |
| Field Transmitters | Energy Infrastructure Monitoring |
Use Scenario: Loop-powered 2-wire 4–20mA smart transmitters measuring pressure, temperature, or flow. IC Role / Device Role / Timing Role: Supplies precision reference for sensor excitation and ADC reference in microcontroller-based transmitter ICs. Use Value: Low 35μVRMS noise prevents degradation of sub-14-bit effective resolution required for HART communication compatibility. |
Use Scenario: Smart electricity meters and grid-edge monitoring units performing voltage/current harmonics analysis. IC Role / Device Role / Timing Role: Reference source for anti-aliasing filter cutoff tuning and RMS calculation circuitry. Use Value: Thermal hysteresis of 0.08% ensures repeatable readings after daily thermal cycling in outdoor meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | Adjustable 2.495V reference; requires two external resistors; 2% initial accuracy; 50ppm/°C TC | Used where programmability or tighter TC is needed; not drop-in due to 3-pin topology and resistor dependency | Select when adjustable output or lower TC outweighs fixed-voltage simplicity and smaller footprint of LM4040D25IDBZT |
| REF3025AIDBZR | 2.5V series reference; 0.2% initial accuracy; 50ppm/°C TC; 50μA quiescent current; requires output capacitor | Preferred in low-noise, high-PSRR applications where supply rejection matters more than shunt simplicity | Choose when system layout permits series reference topology and higher accuracy justifies added capacitor and cost |
Compared with TL431ACDBZR and REF3025AIDBZR, the LM4040D25IDBZT offers smallest PCB footprint, zero external components, and lowest minimum operating current - making it optimal for space- and power-constrained shunt reference roles where ±1% accuracy is sufficient.
Availability
LM4040D25IDBZT is available at Aetrix Electronics and suitable for industrial data-acquisition systems, analog input modules, and field transmitters requiring stable component supply with guaranteed long-term sourcing and consistent parametric performance.
Supply support for LM4040D25IDBZT 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 voltage references and industrial-grade signal chain solutions.
The LM4040 series was designed specifically for cost-sensitive, space-constrained applications demanding micropower operation, robust thermal stability, and simplified implementation - targeting industrial automation, process control, and portable instrumentation markets.
FAQ
What is the maximum cathode current rating for LM4040D25IDBZT?
The absolute maximum cathode current for LM4040D25IDBZT is 25mA, but the recommended operating range is 45μA to 15mA. Operating above 15mA increases self-heating and may degrade long-term stability and temperature coefficient performance. The device is characterized and specified up to 15mA per TI's LM4040D25I electrical characteristics table.
Does LM4040D25IDBZT require an output capacitor for stability?
No, LM4040D25IDBZT is inherently stable with all capacitive loads and does not require an output capacitor. This is explicitly stated in the device features and confirmed in the "Stable with all capacitive loads; no output capacitor required" bullet. The internal design eliminates oscillation risk even with >1μF ceramic or electrolytic capacitance on the cathode node.
What is the thermal hysteresis specification for LM4040D25IDBZT?
The thermal hysteresis for LM4040D25IDBZT is 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This value is consistent across all LM4040 grades and packages, including LM4040D25IDBZT, and is documented in Tables 6.5–6.10 of the TI datasheet.
Can LM4040D25IDBZT operate at –40°C to 125°C?
No - LM4040D25IDBZT is rated for –40°C to 85°C only. The 'I' suffix in the part number denotes industrial temperature grade. For extended temperature operation to 125°C, the correct variant is LM4040D25QDBZT (Q-grade), which carries different ordering and qualification testing per TI's device comparison table.
How does the 150ppm/°C temperature coefficient affect LM4040D25IDBZT output over its full temperature range?
Over the –40°C to 85°C range (ΔT = 125°C), the 150ppm/°C coefficient contributes ±18.75mV (±0.75%) to the 2.5V output, in addition to the ±25mV (±1.0%) initial tolerance. Per TI's overtemperature tolerance calculation, total worst-case error is ±2.5V × (1.0% + 150ppm/°C × 125°C) = ±2.5V × 2.875% = ±71.9mV, or ±2.875% full-scale.
LM4040D25IDBZT 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°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
LM4040D25IDBZT FAQ
1.How can I place an order for LM4040D25IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D25IDBZT 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 LM4040D25IDBZT reliable?
The price and inventory of LM4040D25IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D25IDBZT is usually 5 days.
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LM4040D25IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D25IDBZT 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 LM4040D25IDBZT?
For technical support, including LM4040D25IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D25IDBZT requirements.
6.How does Aetrix verify that LM4040D25IDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040D25IDBZT 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 LM4040D25IDBZT meets industry standards.
7.What is the process for return or replacement of LM4040D25IDBZT?
All LM4040D25IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D25IDBZT, 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 LM4040D25IDBZT part is unused and in its original packaging.
Return procedure for LM4040D25IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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