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Texas Instruments LM4040D30QDBZR
- Part No.:
- LM4040D30QDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D30QDBZR.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,064
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Product details
Overview
LM4040D30QDBZR from Texas Instruments is a precision micropower shunt voltage reference with a fixed 3.0V output, D-grade (±1.0% initial tolerance, 150ppm/°C tempco), rated for –40°C to 125°C operation in SOT-23-3 (DBZ) package, and designed for high-stability analog sensing and data acquisition circuits requiring low noise (35μVRMS) and wide operating current (45μA–15mA).
For engineers reviewing the LM4040D30QDBZR datasheet, LM4040D30QDBZR pinout, LM4040D30QDBZR application, or LM4040D30QDBZR equivalent, this page delivers verified specifications, thermal performance data, pin-level functional roles, real-world use cases in automotive and industrial systems, and validated alternative options for design flexibility.
Technical Context
The LM4040D30QDBZR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 3.0V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed silicon die achieves ±1.0% initial accuracy at 25°C and supports full-range operation up to 125°C ambient with 150ppm/°C temperature coefficient.
It exhibits low dynamic impedance (≤1.2Ω at 1mA), stable performance with all capacitive loads (no output capacitor required), and low wideband noise (35μVRMS, 10Hz–10kHz), making it suitable for high-resolution ADC biasing and precision sensor excitation where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal; maintains stable reference under load and temperature variation for accurate signal conditioning |
| Initial Tolerance | ±1.0% at 25°C; defines maximum deviation before calibration or trimming |
| Tempco | 150ppm/°C max; limits voltage drift over –40°C to 125°C operating range |
| Min Cathode Current | 45μA typical; minimum current required to regulate; enables ultra-low-power system designs |
| Dynamic Impedance | ≤1.2Ω at 1mA; ensures minimal output voltage shift during transient load changes |
| Output Noise | 35μVRMS (10Hz–10kHz); critical for 16-bit+ ADC reference stability and low-distortion audio circuits |
| Operating Temp Range | –40°C to 125°C; qualified for under-hood automotive, industrial control, and energy infrastructure environments |
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 | Current sink node; connects to regulated supply rail via series resistor; voltage develops across anode-cathode |
| Anode (Pin 2) | Common reference ground | Typically tied to system ground; forms reference potential for output voltage measurement |
| NC (Pin 3) | No internal connection | Unbonded terminal; must be left floating or connected to anode per EMI mitigation guidance |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for external output capacitor-reduces BOM count and layout sensitivity |
| Low 35μVRMS noise | Enables direct use with 16-bit SAR and delta-sigma ADCs without additional filtering |
| 45μA min operating current | Supports battery-powered field transmitters and portable instrumentation with multi-year runtime |
| 125°C extended temperature rating | Validated for engine control units, motor drives, and solar inverters with high ambient thermal stress |
| 1.0% initial accuracy grade | Provides cost-optimized precision for applications where post-calibration is acceptable |
Applications
| Industrial Analog Input Module | Automotive Engine Control Unit |
|---|---|
Use Scenario: High-channel-count PLC analog input card measuring 4–20mA sensor signals with 16-bit resolution. IC Role / Device Role / Timing Role: Shunt reference providing stable 3.0V基准 for ADC driver amplifiers and sensor excitation circuitry. Use Value: Maintains ±0.5 LSB error over –40°C to 75°C ambient due to 150ppm/°C tempco and low noise. | Use Scenario: Throttle position sensor signal conditioning in gasoline direct injection engine management. IC Role / Device Role / Timing Role: Precision 3.0V reference for ratiometric sensor bridge excitation and ADC reference in ECU front-end. Use Value: Survives 125°C under-hood environment while holding <±1.2% total error including tempco and long-term drift. |
| Energy Infrastructure Metering | Field-Deployed Process Transmitter |
Use Scenario: Revenue-grade electricity meter with isolated current/voltage sensing and metrology SoC. IC Role / Device Role / Timing Role: Primary voltage reference for metrology ADC and anti-aliasing filter biasing. Use Value: 35μVRMS noise contributes <0.005% of full-scale error; long-term stability ≤120ppm/1000h ensures calibration longevity. | Use Scenario: 4–20mA HART-enabled pressure transmitter operating in remote oil/gas wellheads. IC Role / Device Role / Timing Role: Low-current shunt reference powering signal chain in loop-powered 4mA minimum design. Use Value: 45μA minimum cathode current allows operation down to 3.3V supply with 250Ω loop resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C30IDBZR | Same 3.0V output, C-grade (±0.5%), 100ppm/°C, 125°C rating, SOT-23-3 | Higher initial accuracy and lower tempco; suited for uncalibrated high-precision systems | Select when tighter initial tolerance and lower drift are required without increasing cost tier |
| REF3030AIDBZR | 3.0V, A-grade (±0.2%), 50ppm/°C, 125°C, SOT-23-3, but series topology (not shunt) | Requires different biasing (series regulator vs. shunt); higher quiescent current (45μA vs. 45μA min sink) | Choose only if system architecture permits series reference and demands sub-100ppm/°C drift |
Compared with TL4050C30IDBZR, LM4040D30QDBZR trades 0.5% initial accuracy and 50ppm/°C tempco for lower cost and proven robustness in high-noise industrial shunt configurations; versus REF3030AIDBZR, it avoids series-reference headroom loss but requires external current-setting resistor.
Availability
LM4040D30QDBZR is available at Aetrix Electronics and suitable for industrial analog input modules, automotive engine control units, and energy infrastructure metering requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LM4040D30QDBZR 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, embedded processing, and connectivity solutions with deep expertise in precision analog ICs and industrial-grade reliability.
The LM4040 family is engineered for high-accuracy, low-power shunt voltage referencing in space-constrained, thermally demanding applications-from portable instrumentation to automotive and grid infrastructure.
FAQ
What is the maximum operating temperature for LM4040D30QDBZR?
The LM4040D30QDBZR is characterized for operation from –40°C to +125°C ambient temperature, with full electrical specifications guaranteed across this extended industrial range. This makes LM4040D30QDBZR suitable for under-hood automotive, motor drive, and outdoor energy infrastructure deployments where thermal stress exceeds standard commercial limits.
Does LM4040D30QDBZR require an output capacitor?
No, LM4040D30QDBZR is stable with all capacitive loads and does not require an external output capacitor. Its internal design eliminates oscillation risk even with large (>1μF) bypass caps on the cathode node-simplifying layout and reducing bill-of-materials cost in analog front-ends and sensor interfaces.
What is the minimum cathode current needed for regulation in LM4040D30QDBZR?
The LM4040D30QDBZR requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation. At full temperature range (–40°C to 125°C), the guaranteed minimum is 80μA. This ultra-low requirement enables use in battery-powered field transmitters and energy-harvesting systems where supply current is tightly constrained.
How does the 150ppm/°C temperature coefficient affect LM4040D30QDBZR accuracy over temperature?
With a 150ppm/°C tempco and 3.0V nominal output, LM4040D30QDBZR contributes up to ±45mV drift over a 100°C span (e.g., –40°C to 60°C). Combined with ±30mV initial tolerance at 25°C, total error remains within ±75mV (±2.5%) across that range-validated in LM4040D30QDBZR's extended-temp electrical characteristics table.
Can LM4040D30QDBZR replace LM4040C30QDBZR in an existing design?
Yes, LM4040D30QDBZR is pin-compatible and functionally interchangeable with LM4040C30QDBZR, but with relaxed initial tolerance (±1.0% vs. ±0.5%) and higher tempco (150ppm/°C vs. 100ppm/°C). It is a drop-in replacement where cost optimization is prioritized over highest precision, provided system-level error budget accommodates the wider tolerance band.
LM4040D30QDBZR 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°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
LM4040D30QDBZR FAQ
1.How can I place an order for LM4040D30QDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D30QDBZR 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 LM4040D30QDBZR reliable?
The price and inventory of LM4040D30QDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D30QDBZR is usually 5 days.
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Once your LM4040D30QDBZR 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 LM4040D30QDBZR?
For technical support, including LM4040D30QDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D30QDBZR requirements.
6.How does Aetrix verify that LM4040D30QDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040D30QDBZR 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 LM4040D30QDBZR meets industry standards.
7.What is the process for return or replacement of LM4040D30QDBZR?
All LM4040D30QDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D30QDBZR, 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 LM4040D30QDBZR part is unused and in its original packaging.
Return procedure for LM4040D30QDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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