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Texas Instruments LM4040D20QDBZT
- Part No.:
- LM4040D20QDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D20QDBZT.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:493
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Product details
Overview
LM4040D20QDBZT from Texas Instruments is a precision micropower shunt voltage reference with 2.048V nominal output, D-grade (±1.0% initial tolerance), rated for –40°C to 125°C operation in SOT-23-3 (DBZ) package. It delivers low noise (35μVRMS), stable regulation across 45μA–15mA cathode current, and requires no output capacitor - used in high-accuracy analog input modules and field transmitters.
For engineers reviewing the LM4040D20QDBZT datasheet, LM4040D20QDBZT pinout, LM4040D20QDBZT application, or LM4040D20QDBZT equivalent, key selection criteria include extended-temperature shunt reference stability, cathode current headroom at low power, thermal hysteresis (0.08%), and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040D20QDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.048V reverse breakdown voltage across its terminals. Its Zener-zap trimmed bandgap core achieves ±1.0% initial accuracy and ±150ppm/°C temperature coefficient over –40°C to 125°C.
It exhibits low dynamic impedance (≤1.1Ω at 1mA), minimal voltage drift vs. cathode current (≤10mV over 1mA–15mA), and stable performance with any capacitive load - eliminating need for output capacitance or series resistance in most designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; enables direct interface with 12-bit ADCs using 2.048V full-scale reference. |
| Initial Tolerance | ±1.0% at 25°C; defines worst-case DC offset in precision sensor signal chains before calibration. |
| Temp Coefficient | ±150ppm/°C over –40°C to 125°C; contributes ≤±0.31mV/°C drift in industrial temperature environments. |
| Cathode Current Range | 45μA to 15mA; supports ultra-low-power sensor biasing and higher-current DAC reference buffering. |
| Output Noise | 35μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data acquisition systems without additional filtering. |
| Dynamic Impedance | ≤1.1Ω at 1mA; minimizes load-induced voltage shift when driving switching regulators or multiplexed inputs. |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycling; ensures repeatable voltage after thermal stress in automotive ECUs. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, JEDEC-standard 3-pin configuration with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to supply rail; sinks all cathode current to regulate voltage at this node. |
| Anode (Pin 2) | Common reference / ground return | Typically tied to system ground; forms the 0V reference point for regulated output. |
| NC (Pin 3) | No internal connection | Must be left unconnected or tied to anode per EMI mitigation guidance in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates reliably with any capacitive load up to 10μF - eliminates BOM cost and layout area for output capacitor. |
| Micropower operation | 45μA minimum cathode current enables use in battery-powered field instruments with multi-year runtime. |
| Extended temperature range | Specified from –40°C to 125°C - qualified for under-hood automotive and industrial control applications. |
| Low long-term drift | 120ppm shift after 1000 hours at 25°C - reduces recalibration frequency in metrology equipment. |
| ESD robustness | ±2000V HBM rating - withstands handling and board-level assembly without special precautions. |
Applications
| Industrial Analog Input Module | Automotive Field Transmitter |
|---|---|
Use Scenario: 4–20mA loop-powered sensor front-end conditioning analog signals before digitization. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048V excitation and ADC reference for ratiometric measurement. Use Value: Enables 12-bit effective resolution with <±0.5 LSB total unadjusted error over full temperature range. | Use Scenario: Pressure/temperature transmitter operating in engine bay or exhaust proximity. IC Role / Device Role / Timing Role: Precision voltage reference for signal conditioning circuitry exposed to –40°C to 125°C ambient. Use Value: Maintains <±2.5mV output deviation across full temperature cycle, meeting ASIL-B functional safety margin. |
| Energy Infrastructure Metering | Portable Test Equipment |
Use Scenario: Revenue-grade electricity meter requiring decade-long calibration stability. IC Role / Device Role / Timing Role: Primary reference for polyphase energy measurement ASICs and isolation amplifiers. Use Value: 0.08% thermal hysteresis and 120ppm long-term drift support Class 0.2 accuracy compliance. | Use Scenario: Handheld multimeter or oscilloscope probe calibration source. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for autoranging front-end gain stages and ADC references. Use Value: 35μVRMS noise and ±150ppm/°C TC enable sub-100μV measurement repeatability at 23°C ±5°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable (2.5V setpoint), ±0.5% initial tolerance, 100ppm/°C TC, SOT-23-5 | Requires two external resistors; lower TC but wider tolerance than LM4040D20QDBZT's fixed 2.048V | Choose when design flexibility for non-standard reference voltages outweighs fixed-voltage simplicity and thermal hysteresis advantage. |
| MAX6008AEUR+T | Fixed 2.048V, ±0.2% initial tolerance, 75ppm/°C TC, SC70-3, –40°C to 125°C | Higher accuracy and lower TC, but limited 10mA max cathode current and higher 65μVRMS noise | Prefer when tighter initial tolerance and lower TC are critical, and cathode current stays below 10mA with acceptable noise trade-off. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040D20QDBZT offers superior thermal hysteresis (0.08% vs. ≥0.15%), guaranteed 15mA cathode drive, and lowest noise - making it optimal for high-reliability, fixed-2.048V industrial sensing where long-term stability and load drive matter most.
Availability
LM4040D20QDBZT is available at Aetrix Electronics and suitable for industrial analog input modules, automotive field transmitters, and energy infrastructure metering requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4040D20QDBZT 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 deep expertise in precision analog ICs and industrial-grade reliability.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in harsh environments - emphasizing thermal stability, micropower operation, and capacitor-free robustness for industrial and automotive systems.
FAQ
What is the maximum cathode current rating for LM4040D20QDBZT?
The LM4040D20QDBZT has an absolute maximum cathode current of 25mA per its Absolute Maximum Ratings table. However, the recommended operating condition specifies up to 15mA for reliable performance across the full –40°C to 125°C temperature range. Exceeding 15mA may increase self-heating and degrade long-term stability or thermal hysteresis performance in the LM4040D20QDBZT.
Does LM4040D20QDBZT require an output capacitor for stability?
No, the LM4040D20QDBZT is explicitly designed to be stable with all capacitive loads and does not require an output capacitor. Its internal architecture ensures phase margin is maintained regardless of load capacitance - a key differentiator from many other shunt references. This eliminates BOM cost and PCB area for external capacitance in the LM4040D20QDBZT design.
What is the thermal hysteresis specification for LM4040D20QDBZT?
The LM4040D20QDBZT has a thermal hysteresis of 0.08%, defined as the voltage difference measured at 25°C after cycling from –40°C versus after cycling from 125°C. This value is consistent across all grades and packages in the LM4040 family and is critical for applications requiring repeatable voltage after thermal cycling, such as automotive ECUs and field instrumentation using the LM4040D20QDBZT.
Can LM4040D20QDBZT be used in battery-powered applications?
Yes, the LM4040D20QDBZT supports micropower operation with a typical minimum cathode current of 45μA - enabling use in battery-powered devices like portable test equipment and wireless sensors. Its low quiescent current, combined with stable regulation down to this level and 35μVRMS noise, makes the LM4040D20QDBZT well-suited for multi-year runtime designs where precision and efficiency coexist.
What package type is used for LM4040D20QDBZT?
The LM4040D20QDBZT uses the SOT-23-3 (DBZ) package: a 3-pin, surface-mount, gull-wing leaded package measuring 2.92mm × 1.30mm. Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is NC (no internal connection). This compact, JEDEC-standard package supports automated assembly and high-density PCB layouts in the LM4040D20QDBZT implementation.
LM4040D20QDBZT 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):
- 2.048V
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D20QDBZT FAQ
1.How can I place an order for LM4040D20QDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D20QDBZT 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 LM4040D20QDBZT reliable?
The price and inventory of LM4040D20QDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D20QDBZT is usually 5 days.
3.What payment methods are accepted for LM4040D20QDBZT?
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LM4040D20QDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D20QDBZT 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 LM4040D20QDBZT?
For technical support, including LM4040D20QDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D20QDBZT requirements.
6.How does Aetrix verify that LM4040D20QDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040D20QDBZT 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 LM4040D20QDBZT meets industry standards.
7.What is the process for return or replacement of LM4040D20QDBZT?
All LM4040D20QDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D20QDBZT, 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 LM4040D20QDBZT part is unused and in its original packaging.
Return procedure for LM4040D20QDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D20QDBZT Tags
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