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Texas Instruments LM4040C25QDBZTG4
- Part No.:
- LM4040C25QDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C25QDBZTG4.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,845
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Product details
Overview
LM4040C25QDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5V output with ±0.5% initial accuracy (C grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and operation across –40°C to 125°C. It serves as a stable voltage reference in high-accuracy analog signal chains for industrial sensors and data acquisition systems.
For engineers reviewing the LM4040C25QDBZTG4 datasheet, LM4040C25QDBZTG4 pinout, LM4040C25QDBZTG4 application, or LM4040C25QDBZTG4 equivalent, key selection criteria include extended-temperature stability, low 45μA minimum cathode current, no-output-capacitor operation, and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4040C25QDBZTG4 uses Zener-zap trimming during wafer sort to achieve ±0.5% initial tolerance at 25°C and maintains tight thermal drift via low-tempco bandgap-assisted Zener architecture. Its two-terminal shunt topology requires only an external series resistor to regulate cathode current between 45μA and 15mA.
Designed for extended-temperature operation (–40°C to 125°C), it exhibits 0.08% thermal hysteresis and stable performance with all capacitive loads - eliminating need for output bypass capacitors while maintaining 0.9Ω typical dynamic impedance at 1mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal; enables direct interface with 2.5V ADC references and precision DAC biasing without scaling. |
| Initial Accuracy | ±0.5% at 25°C (C grade); supports 12-bit system accuracy without calibration in industrial temperature range. |
| Temp. Coefficient | 100ppm/°C max; contributes ≤±0.25% output drift over –40°C to 125°C ambient, critical for field transmitters. |
| Min. Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered sensor nodes and portable instrumentation. |
| Output Noise | 35μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data acquisition front-ends without added filtering. |
| Dynamic Impedance | 0.9Ω typical at 1mA; ensures minimal load-regulation error when driving varying reference inputs. |
| Thermal Hysteresis | 0.08%; guarantees repeatable voltage after thermal cycling - essential for recalibration-free field deployments. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connects to regulated supply rail; sinks current to maintain 2.5V across anode–cathode terminals. |
| Anode (Pin 2) | Common ground reference | Typically tied to system ground; forms return path for cathode current and defines reference potential. |
| NC (Pin 3) | No internal connection | Must float or connect to anode per TI recommendation in EMI-sensitive environments (e.g., near switching regulators). |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.5V output | Eliminates external resistor divider, reducing BOM count and layout sensitivity in precision reference designs. |
| Stable with all capacitive loads | Enables direct connection to ADC/DAC reference pins without stability-compromising output capacitors. |
| Extended temperature range | Rated for –40°C to 125°C operation, supporting under-hood automotive and industrial control applications. |
| Low 45μA min. operating current | Permits use in always-on sensor interfaces where quiescent power must remain below 100μW at 2.5V. |
| 100ppm/°C tempco (C grade) | Provides predictable, bounded drift for calibration-critical systems like energy metering and process control. |
Applications
| Industrial Sensor Signal Conditioning | Energy Meter Reference Subsystem |
|---|---|
|
Use Scenario: High-accuracy RTD or strain-gauge bridge amplification in factory-floor transmitters. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for instrumentation amplifier gain-setting and ADC full-scale calibration. Use Value: Enables <±0.1% total unadjusted error over temperature without periodic recalibration. |
Use Scenario: Polyphase electricity meter requiring metrology-grade voltage reference for 24-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Supplies precision reference to anti-aliasing filter op-amps and ADC reference input. Use Value: Maintains <±0.05% reference drift over 10-year field life, meeting IEC 62053-21 Class 0.2 accuracy. |
| Portable Data Logger Analog Front-End | Automotive Cabin Temperature Sensor Module |
|
Use Scenario: Battery-powered environmental monitor logging temperature/humidity with 16-bit resolution. IC Role / Device Role / Timing Role: References low-noise PGA and SAR ADC in sleep-wake measurement cycles. Use Value: 35μVRMS noise and 45μA min. current extend battery life >2 years while preserving 16-bit ENOB. |
Use Scenario: NTC-based cabin air temperature sensing in HVAC control units exposed to under-dash thermal stress. IC Role / Device Role / Timing Role: Supplies excitation and reference for ratiometric NTC measurement circuitry. Use Value: 100ppm/°C tempco and 125°C rating ensure <±0.5°C absolute accuracy across full vehicle operating envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C25IDBZR | Same 2.5V/C-grade spec, but industrial-temp (–40°C to 85°C) and tape-and-reel packaging. | Lacks extended-temperature qualification; unsuitable for under-hood or high-ambient industrial use. | Select when cost sensitivity outweighs 125°C requirement and board-level thermal management is sufficient. |
| REF3025AIDBZR | 2.5V series reference; 50ppm/°C tempco, 25μVRMS noise, but requires 50μA min. supply current and output capacitor. | Higher accuracy/noise performance, but adds external capacitor and cannot operate below 50μA. | Choose for ultra-low-noise 18-bit+ systems where layout area permits series-reference support components. |
Compared with LM4040C25IDBZR, LM4040C25QDBZTG4 enables higher-temperature deployment without derating; compared with REF3025AIDBZR, it eliminates output capacitance and supports lower-quiescent-current operation at the cost of slightly higher tempco and noise.
Availability
LM4040C25QDBZTG4 is available at Aetrix Electronics and suitable for industrial sensor conditioning, energy metering subsystems, and automotive cabin sensing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040C25QDBZTG4 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 high-reliability manufacturing.
The LM4040 family was engineered for cost-effective, space-efficient shunt reference applications demanding micropower operation, wide temperature support, and robustness across industrial and automotive environments.
FAQ
What is the operating temperature range of the LM4040C25QDBZTG4?
The LM4040C25QDBZTG4 is characterized for operation from –40°C to +125°C ambient temperature. This extended temperature range is explicitly specified in TI's official datasheet Section 4 (Device Comparison Table) and Section 6.10 (Electrical Characteristics), making it suitable for under-hood automotive and high-ambient industrial applications where standard industrial-grade references fail.
Does the LM4040C25QDBZTG4 require an output capacitor for stability?
No, the LM4040C25QDBZTG4 is stable with all capacitive loads and does not require an output capacitor. This is confirmed in the "Features" section and "Description" of the datasheet, which states "Stable with all capacitive loads; no output capacitor required." This simplifies layout and reduces BOM count in space-constrained designs.
What is the minimum cathode current needed for regulation in the LM4040C25QDBZTG4?
The LM4040C25QDBZTG4 requires a minimum cathode current of 45μA (typical) to maintain regulation. This value is specified in Section 6.10 of the datasheet under "IZ,min" and is critical for ultra-low-power applications such as battery-backed sensors and portable data loggers.
How does the LM4040C25QDBZTG4 differ from the LM4040C25IDBZR?
The LM4040C25QDBZTG4 is qualified for –40°C to 125°C operation and uses DBZ (SOT-23-3) packaging with tape-and-reel delivery (G4 suffix), whereas the LM4040C25IDBZR is rated only to 85°C and shipped in standard tape-and-reel. Both share identical electrical specs (2.5V, C grade), but thermal capability is the decisive differentiator.
What is the thermal hysteresis specification for the LM4040C25QDBZTG4?
The LM4040C25QDBZTG4 has a thermal hysteresis of 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This parameter is explicitly listed in Tables 6.5–6.10 of the datasheet and ensures repeatability in field-deployed systems subject to repeated thermal cycling.
LM4040C25QDBZTG4 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:
- ±0.5%
- 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
LM4040C25QDBZTG4 FAQ
1.How can I place an order for LM4040C25QDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25QDBZTG4 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 LM4040C25QDBZTG4 reliable?
The price and inventory of LM4040C25QDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25QDBZTG4 is usually 5 days.
3.What payment methods are accepted for LM4040C25QDBZTG4?
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4.How is shipping managed for LM4040C25QDBZTG4?
LM4040C25QDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25QDBZTG4 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 LM4040C25QDBZTG4?
For technical support, including LM4040C25QDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25QDBZTG4 requirements.
6.How does Aetrix verify that LM4040C25QDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040C25QDBZTG4 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 LM4040C25QDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040C25QDBZTG4?
All LM4040C25QDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25QDBZTG4, 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 LM4040C25QDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040C25QDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C25QDBZTG4 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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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
Texas Instruments
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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
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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