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Texas Instruments LM4040C30QDBZT
- Part No.:
- LM4040C30QDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C30QDBZT.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,102
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Product details
Overview
LM4040C30QDBZT from Texas Instruments is a precision 3.0V 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-accuracy analog signal chains.
For engineers reviewing the LM4040C30QDBZT datasheet, LM4040C30QDBZT pinout, LM4040C30QDBZT application, or LM4040C30QDBZT equivalent, key selection criteria include its extended-temperature C-grade tolerance, no-output-capacitor-required stability, low dynamic impedance (0.4Ω typical), and compatibility with capacitive loads in portable and automotive sensing systems.
Technical Context
The LM4040C30QDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 3.0V reverse breakdown voltage across its terminals. Its Zener-zap trimmed bandgap architecture delivers tight initial tolerance and predictable thermal drift over full industrial and extended temperature ranges.
It requires no external compensation and remains stable under all capacitive load conditions due to inherent low dynamic impedance (≤0.9Ω) and minimal output capacitance dependence. The device's 100ppm/°C max temperature coefficient and 0.08% thermal hysteresis support repeatable performance in cyclic thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal at IZ = 100μA; enables direct interface with 3V ADC references and microcontroller VREF inputs. |
| Initial Accuracy | ±0.5% at 25°C; ensures ≤±15mV absolute error before thermal or load correction. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±30mV drift over –40°C to 125°C ambient range. |
| Min Cathode Current | 45μA typical; supports ultra-low-power battery-operated sensors and energy-harvesting nodes. |
| Dynamic Impedance | 0.4Ω typical at 1mA; minimizes output voltage shift under varying load currents. |
| Output Noise | 35μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data acquisition front-ends. |
| Operating Temp | –40°C to 125°C; qualified for under-hood automotive, industrial motor control, and field transmitter use. |
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 | Connected to regulated supply rail; sinks current to maintain 3.0V drop across anode-to-cathode path. |
| Anode (Pin 2) | Reference ground / common return | Typically tied to system ground; forms the 0V reference point for output voltage measurement. |
| NC (Pin 3) | No internal connection | Must be left unconnected or tied to anode only in high-EMI environments per TI recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load - eliminates BOM cost and layout area for external bypass caps. |
| Low micropower consumption | 45μA minimum operating current enables >10-year battery life in wireless sensor nodes. |
| Extended temperature qualification | –40°C to 125°C operation supports automotive engine control units and industrial PLC modules. |
| Tight long-term stability | 120ppm drift after 1000 hours ensures calibration integrity in field-deployed instrumentation. |
| Low thermal hysteresis | 0.08% hysteresis enables repeatable voltage output after thermal cycling in outdoor metering devices. |
Applications
| Energy Infrastructure | Field Transmitters |
|---|---|
Use Scenario: High-voltage DC monitoring in solar inverters and battery management systems. IC Role / Device Role / Timing Role: Provides stable 3.0V reference for isolated ADCs measuring bus voltage and current. Use Value: Enables ±0.5% system-level voltage measurement accuracy across temperature without recalibration. | Use Scenario: 4–20mA loop-powered pressure/temperature transmitters in oil & gas plants. IC Role / Device Role / Timing Role: Supplies precision reference to DAC and op-amp circuitry generating analog output signals. Use Value: Maintains loop accuracy within 0.1% FSR over –40°C to 125°C ambient, meeting SIL-2 requirements. |
| Automotive Electronics | Analog Input Module |
Use Scenario: Cabin temperature and humidity sensing in HVAC control units. IC Role / Device Role / Timing Role: References thermistor bridge amplifier and 12-bit SAR ADC in low-power sleep mode. Use Value: Delivers <35μVRMS noise floor and <100ppm/°C drift, preserving 12-bit ENOB at full temperature range. | Use Scenario: Modular PLC analog input cards accepting 0–10V or ±10V field signals. IC Role / Device Role / Timing Role: Serves as master reference for programmable gain instrumentation amplifiers and sigma-delta ADCs. Use Value: Guarantees <±0.5% total unadjusted error over 15-year product lifecycle with no field recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C30QDBZR | Same 3.0V output, ±0.5% grade, SOT-23-3 package, but higher 75μA min cathode current and 50μVRMS noise. | Less suitable for sub-50μA ultra-low-power designs; preferred where higher ESD immunity (4kV HBM) is required. | Select TL4050C30QDBZR when system-level ESD robustness outweighs micropower priority. |
| MAX6003EUR+T | 3.0V output, ±0.5% grade, SOT-23-3, but rated only to 85°C and requires ≥60μA cathode current. | Not qualified for under-hood automotive or high-temp industrial use; limited to commercial-temperature embedded systems. | Choose MAX6003EUR+T only for cost-sensitive, non-extended-temp applications with adequate headroom above 60μA. |
Compared with TL4050C30QDBZR and MAX6003EUR+T, the LM4040C30QDBZT uniquely combines extended-temperature operation, lowest min cathode current (45μA), and lowest noise (35μVRMS) in the 3.0V C-grade shunt reference category - making it optimal for high-reliability, low-power, wide-temperature analog measurement.
Availability
LM4040C30QDBZT is available at Aetrix Electronics and suitable for energy infrastructure monitoring, field transmitter calibration, automotive cabin sensing, and analog input module design requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LM4040C30QDBZT 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 delivering analog and embedded processing solutions with focus on reliability, precision, and power efficiency.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in data acquisition, industrial sensing, and automotive systems where space, thermal resilience, and long-term stability are critical.
FAQ
What is the maximum operating temperature of the LM4040C30QDBZT?
The LM4040C30QDBZT is characterized for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive and industrial environments where thermal stress is severe. This extended temperature rating is confirmed in Section 6.13 of the official TI datasheet (SLOS456Q, Rev April 2026), and applies specifically to the Q-grade variants including LM4040C30QDBZT.
Does the LM4040C30QDBZT require an external output capacitor?
No, the LM4040C30QDBZT is stable with all capacitive loads and does not require an external output capacitor - a key feature confirmed in the "Features" section and "Description" of the TI datasheet. This simplifies PCB layout, reduces BOM count, and improves reliability in space-constrained applications such as field transmitters and portable instrumentation.
What is the minimum cathode current needed for regulation in the LM4040C30QDBZT?
The LM4040C30QDBZT has a typical minimum cathode current (IZ,min) of 45μA at 25°C, with a maximum of 82μA over the full –40°C to 125°C range. This ultra-low requirement enables use in energy-harvesting systems and battery-powered sensors where quiescent current must remain below 50μA to achieve multi-year operational life.
How does the LM4040C30QDBZT compare to the LM4040C30IDBZR in terms of temperature range?
The LM4040C30QDBZT is rated for –40°C to 125°C operation, while the LM4040C30IDBZR is specified only for –40°C to 85°C. The "Q" suffix explicitly denotes the extended-temperature grade, verified in TI's Device Comparison Table and Section 6.12–6.13 electrical characteristics. This makes LM4040C30QDBZT the appropriate choice for automotive powertrain and industrial motor drive applications.
What is the reverse dynamic impedance of the LM4040C30QDBZT at 1mA cathode current?
The reverse dynamic impedance (ZZ) of the LM4040C30QDBZT is 0.4Ω typical and 0.9Ω maximum at IZ = 1mA, f = 120Hz, and IAC = 0.1·IZ. This low impedance value ensures minimal output voltage variation under changing load conditions - critical for maintaining ADC reference accuracy in high-resolution data acquisition systems.
LM4040C30QDBZT 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):
- 3V
- 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:
- 82 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C30QDBZT FAQ
1.How can I place an order for LM4040C30QDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C30QDBZT 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 LM4040C30QDBZT reliable?
The price and inventory of LM4040C30QDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C30QDBZT is usually 5 days.
3.What payment methods are accepted for LM4040C30QDBZT?
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4.How is shipping managed for LM4040C30QDBZT?
LM4040C30QDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C30QDBZT 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 LM4040C30QDBZT?
For technical support, including LM4040C30QDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C30QDBZT requirements.
6.How does Aetrix verify that LM4040C30QDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040C30QDBZT 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 LM4040C30QDBZT meets industry standards.
7.What is the process for return or replacement of LM4040C30QDBZT?
All LM4040C30QDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C30QDBZT, 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 LM4040C30QDBZT part is unused and in its original packaging.
Return procedure for LM4040C30QDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C30QDBZT Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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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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