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Texas Instruments LM4040D25IDBZR
- Part No.:
- LM4040D25IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D25IDBZR.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,815
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Product details
Overview
LM4040D25IDBZR from Texas Instruments is a precision micropower shunt voltage reference with 2.5V nominal output, D-grade (±1.0% initial tolerance, 150ppm/°C tempco), rated for –40°C to 85°C operation, packaged in SOT-23-3 (DBZ), and designed for low-noise analog signal conditioning in portable and industrial systems.
For engineers reviewing the LM4040D25IDBZR datasheet, LM4040D25IDBZR pinout, LM4040D25IDBZR application, or LM4040D25IDBZR equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options - all grounded in TI's official SLOS456Q production data sheet.
Technical Context
The LM4040D25IDBZR 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-zap trimmed silicon design achieves ±1.0% initial accuracy at 25°C and supports operation from 45μA minimum cathode current up to 15mA.
It exhibits low dynamic impedance (≤1.1Ω at 1mA), 35μVRMS wideband noise (10Hz–10kHz), and thermal hysteresis of 0.08%, enabling stable performance in data-acquisition front-ends and precision ADC biasing where supply headroom is constrained.
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 rail-to-rail op-amp stages. |
| Initial Tolerance | ±1.0% maximum at 25°C (D grade); defines worst-case offset in calibration-critical sensor signal chains. |
| Tempco | 150ppm/°C maximum; contributes ≤±0.195% drift over –40°C to 85°C ambient range. |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered field transmitters. |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures <1mV output shift under 1mA load transients, critical for high-resolution SAR ADC reference stability. |
| Wideband Noise | 35μVRMS (10Hz–10kHz); limits added noise floor in 16-bit+ data acquisition systems. |
| Operating Temp Range | –40°C to +85°C; qualified for industrial control and automotive cabin electronics applications. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to regulated supply rail; sinks current to maintain 2.5V across anode–cathode. |
| Anode (Pin 2) | Reference ground return | Typically tied to system ground; forms the 0V reference point for output voltage measurement. |
| NC (Pin 3) | No internal connection | Unused terminal; must be left floating or optionally tied to anode per EMI mitigation guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for external output capacitor - simplifies layout and reduces BOM count in space-constrained modules. |
| Low 35μVRMS noise | Preserves SNR in precision 16-bit+ ADC systems without requiring additional filtering or LDO post-regulation. |
| 45μA min operating current | Enables microamp-level system sleep modes while retaining reference integrity for wake-up circuitry. |
| 150ppm/°C tempco (max) | Meets industrial-grade stability requirements without active temperature compensation circuitry. |
| –40°C to 85°C operation | Validated for deployment in uncontrolled ambient environments including factory-floor PLC I/O modules. |
Applications
| Data-Acquisition Systems | Energy Infrastructure |
|---|---|
Use Scenario: High-resolution voltage measurement in portable multimeters and modular DAQ cards. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for 24-bit sigma-delta ADCs and precision gain-setting resistors. Use Value: Enables ±0.1% full-scale accuracy over temperature without recalibration, leveraging 1.0% initial tolerance and 150ppm/°C drift control. | Use Scenario: Voltage monitoring in solar inverter DC-link sensing and battery management cell-voltage stacks. IC Role / Device Role / Timing Role: Shunt reference for isolated ADC front-ends measuring up to 1000V DC bus segments. Use Value: Maintains accuracy under wide thermal swings (–40°C to 85°C) and high EMI, supported by low noise and no-output-capacitor stability. |
| Analog Input Module | Field Transmitters |
Use Scenario: 4–20mA loop-powered analog input cards in distributed control systems. IC Role / Device Role / Timing Role: Precision reference for programmable gain instrumentation amplifiers and ADC bias networks. Use Value: Delivers consistent 2.5V scaling across channel banks with minimal inter-channel gain error due to tight tempco and low hysteresis (0.08%). | Use Scenario: Two-wire 4–20mA smart pressure/temperature transmitters deployed in oil & gas wellheads. IC Role / Device Role / Timing Role: Low-current shunt reference powering signal conditioning and microcontroller ADCs within strict 3.5mA loop budget. Use Value: Operates reliably at 45μA minimum cathode current, enabling full functionality during low-power sleep states while preserving reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C25IDBZR | Same 2.5V output, C-grade (±0.5%), 100ppm/°C tempco, identical SOT-23-3 package and pinout. | Better initial accuracy and lower tempco; suited for higher-precision DAQ where ±1.0% is insufficient. | Select when tighter long-term stability and reduced thermal drift outweigh cost sensitivity. |
| REF3025AIDBZR | 2.5V series reference; requires external bypass cap; 50ppm/°C max tempco; 50μA quiescent current. | Higher drive capability (25mA), but needs ≥1μF output capacitance and consumes more supply current. | Choose for applications needing buffered output or higher load current, accepting larger footprint and layout complexity. |
Compared with TL4050C25IDBZR, LM4040D25IDBZR trades ±0.5% accuracy and 100ppm/°C for lower cost and proven robustness in high-EMI field transmitter designs; versus REF3025AIDBZR, it eliminates output capacitor dependency and reduces quiescent current by 11%, critical for loop-powered devices.
Availability
LM4040D25IDBZR is available at Aetrix Electronics and suitable for data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply, extended temperature qualification, and long-lifecycle availability.
Supply support for LM4040D25IDBZR 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 industrial-grade reliability validation.
The LM4040 series was developed specifically for cost-sensitive, space-constrained applications demanding micropower operation, low noise, and stable shunt regulation - particularly in portable instrumentation and industrial sensor interfaces.
FAQ
What is the maximum cathode current rating for LM4040D25IDBZR?
The absolute maximum cathode current for LM4040D25IDBZR is 25mA, per TI's SLOS456Q Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA - exceeding 15mA risks thermal overstress and accelerated long-term drift, especially at elevated ambient temperatures. Designers should size the series resistor to limit IZ within this 15mA upper bound under worst-case input voltage conditions.
Does LM4040D25IDBZR require an output capacitor for stability?
No, LM4040D25IDBZR is inherently stable with all capacitive loads and does not require an external output capacitor - a key advantage over many series references. This is confirmed in TI's official description: "Stable with all capacitive loads; no output capacitor required." The device's low dynamic impedance (<1.1Ω) and internal compensation eliminate oscillation risk even with >10μF ceramic or tantalum capacitors on the cathode node.
What is the thermal hysteresis specification for LM4040D25IDBZR?
The thermal hysteresis of LM4040D25IDBZR 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 per Section 6.5–6.10 of SLOS456Q, and directly impacts repeatability in systems undergoing repeated thermal cycles - such as outdoor energy meters or automotive cabin sensors.
Can LM4040D25IDBZR be used in automotive under-hood applications?
LM4040D25IDBZR is qualified for –40°C to +85°C operation (industrial grade), not the extended –40°C to +125°C range required for most under-hood automotive applications. For such environments, TI offers the Q-grade variant LM4040D25QDBZR, which shares identical electrical specs but is characterized across –40°C to +125°C. Using LM4040D25IDBZR beyond 85°C ambient violates its specified operating conditions and may cause parametric shift or premature failure.
How does the 150ppm/°C temperature coefficient affect LM4040D25IDBZR output over its full temperature range?
With a maximum 150ppm/°C tempco and 2.5V nominal output, LM4040D25IDBZR contributes up to ±0.195% (±4.875mV) of additional error over its –40°C to +85°C range beyond initial tolerance. This is calculated as 150ppm/°C × 125°C ΔT × 2.5V = ±46.875mV total drift, but TI's datasheet specifies the *overtemperature tolerance* for D-grade as ±2.5V × 1.98% = ±49.5mV - confirming the combined effect of initial error and thermal drift remains within guaranteed bounds.
LM4040D25IDBZR 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
LM4040D25IDBZR FAQ
1.How can I place an order for LM4040D25IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D25IDBZR 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 LM4040D25IDBZR reliable?
The price and inventory of LM4040D25IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D25IDBZR is usually 5 days.
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LM4040D25IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D25IDBZR 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 LM4040D25IDBZR?
For technical support, including LM4040D25IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D25IDBZR requirements.
6.How does Aetrix verify that LM4040D25IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040D25IDBZR 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 LM4040D25IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040D25IDBZR?
All LM4040D25IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D25IDBZR, 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 LM4040D25IDBZR part is unused and in its original packaging.
Return procedure for LM4040D25IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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