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Texas Instruments LM4040D20IDBZT
- Part No.:
- LM4040D20IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D20IDBZT.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,583
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Product details
Overview
LM4040D20IDBZT from Texas Instruments is a precision micropower shunt voltage reference with 2.048V nominal output, ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-drift reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040D20IDBZT datasheet, LM4040D20IDBZT pinout, LM4040D20IDBZT application, or LM4040D20IDBZT equivalent, key selection criteria include its SOT-23-3 package, industrial temperature range (–40°C to 85°C), no-output-capacitor requirement, and compatibility with high-precision data acquisition systems requiring tight DC stability.
Technical Context
The LM4040D20IDBZT operates as a two-terminal shunt reference, sinking cathode current to maintain a stable 2.048V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed silicon design achieves ±1.0% initial tolerance and 150ppm/°C max temperature coefficient over –40°C to 85°C.
It exhibits low dynamic impedance (≤1.1Ω at 1mA), minimal voltage variation with load current (≤10mV from 45μA to 15mA), and thermal hysteresis of only 0.08%. No external capacitor is required for stability, even with capacitive loads up to 10nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; enables precise 12-bit ADC full-scale alignment without scaling resistors |
| Initial Accuracy | ±1.0% at 25°C; supports cost-sensitive industrial sensing where <1% absolute error is acceptable |
| Temp Coefficient | 150ppm/°C max; contributes ≤±0.13% drift over –40°C to 85°C ambient range |
| Noise (10Hz–10kHz) | 35μVRMS typical; avoids introducing measurable error in 16-bit SAR ADC references |
| 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 |
| Operating Range | –40°C to 85°C; qualified for industrial control and energy infrastructure environments |
Pinout & Package
LM4040D20IDBZT uses the 3-pin SOT-23 (DBZ) package, measuring 2.92mm × 1.30mm. The device is a two-terminal shunt reference; Pin 3 is internally connected to the anode and must be tied to ground or left floating per layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks all excess current to maintain 2.048V across load |
| Anode (Pin 2) | Reference ground terminal | Must be connected to system ground; defines 0V reference point for output voltage |
| NC (Pin 3) | No internal connection | May float or connect to anode in EMI-sensitive layouts; no electrical function required |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with all capacitive loads up to 10nF; eliminates BOM cost and PCB area for decoupling caps |
| Micropower startup | 45μA minimum cathode current enables use in sub-100μA standby circuits |
| Low thermal hysteresis | 0.08% voltage shift after –40°C ↔ 125°C cycling; preserves calibration integrity in thermal-cycling environments |
| Extended temp qualification | Specified over –40°C to 85°C; supports deployment in outdoor energy meters and factory automation nodes |
| Low wideband noise | 35μVRMS (10Hz–10kHz); maintains SNR >100dB in precision instrumentation front-ends |
Applications
| Data-Acquisition Systems | Energy Infrastructure |
|---|---|
Use Scenario: High-resolution ADC reference in portable multimeters and PLC analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.048V reference for 12-bit and 16-bit SAR ADCs. Use Value: Enables direct mapping of 0–2.048V input range to full digital code without gain/offset calibration. |
Use Scenario: Voltage reference in smart electricity meters and solar inverter monitoring circuits. IC Role / Device Role / Timing Role: Precision reference for current-sense amplifier biasing and isolation amplifier scaling. Use Value: Maintains ±0.5% metering accuracy over temperature and 10-year lifetime via low long-term drift (120ppm). |
| Analog Input Module | Field Transmitters |
Use Scenario: Reference source in 4–20mA loop-powered analog input cards for industrial sensors. IC Role / Device Role / Timing Role: Low-current shunt reference supplying excitation and scaling for RTD/thermocouple signal chains. Use Value: Operates reliably at 45μA min current, enabling full functionality within 3.5mA loop budget headroom. |
Use Scenario: Voltage reference in HART-enabled 4–20mA field transmitters for pressure and flow measurement. IC Role / Device Role / Timing Role: Stable reference for DAC output scaling and sensor linearization circuitry. Use Value: 150ppm/°C tempco and 0.08% hysteresis ensure repeatability across wide ambient swings in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C20IDBZT | ±0.5% initial accuracy, 100ppm/°C tempco - tighter specs than LM4040D20IDBZT | Better suited for 14-bit+ data acquisition where <0.5% absolute error is required | Select when higher accuracy justifies modest cost increase; same SOT-23-3 footprint and pinout |
| REF3020AIDBZR | 2.048V series reference, ±0.2% accuracy, 50ppm/°C, 50μA quiescent current | Requires output capacitor; not a drop-in replacement due to 3-pin series architecture vs. 2-pin shunt | Choose for lowest tempco and noise in space-constrained designs where series topology is acceptable |
Compared with LM4040C20IDBZT, the LM4040D20IDBZT trades accuracy for lower cost in industrial-grade systems; compared with REF3020AIDBZR, it offers simpler 2-pin integration but higher tempco and noise - making it optimal for cost-sensitive, moderate-precision shunt reference roles.
Availability
LM4040D20IDBZT is available at Aetrix Electronics and suitable for data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4040D20IDBZT 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-volume manufacturing.
The LM4040 series was developed to deliver cost-effective, space-efficient shunt references for industrial and portable instrumentation - emphasizing micropower operation, capacitor-free stability, and robust temperature performance.
FAQ
What is the operating temperature range for LM4040D20IDBZT?
The LM4040D20IDBZT is specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in factory automation, energy metering, and outdoor sensor nodes where environmental extremes are expected. The device's 150ppm/°C temperature coefficient ensures predictable drift behavior across this full span.
Does LM4040D20IDBZT require an output capacitor?
No, LM4040D20IDBZT is stable with all capacitive loads and requires no output capacitor for proper operation. This simplifies PCB layout, reduces BOM count, and eliminates capacitor-related aging or ESR effects that could degrade long-term reference stability in systems like portable data loggers.
What is the minimum cathode current needed for LM4040D20IDBZT regulation?
The LM4040D20IDBZT requires a minimum cathode current of 45μA (typical) to maintain regulation. At this level, the device delivers its specified 2.048V output with D-grade accuracy. Applications such as loop-powered field transmitters can rely on this ultra-low threshold to stay functional within tight current budgets.
How does the LM4040D20IDBZT compare to the LM4040A20IDBZT in accuracy?
The LM4040D20IDBZT has ±1.0% initial accuracy and 150ppm/°C temperature coefficient, while the LM4040A20IDBZT offers ±0.1% accuracy and 100ppm/°C. The LM4040D20IDBZT is optimized for cost-sensitive industrial applications where ±1% absolute error is acceptable, whereas the A-grade variant targets high-precision test equipment and calibration systems.
Can LM4040D20IDBZT be used in place of a 2.5V reference?
No - LM4040D20IDBZT provides a fixed 2.048V output, not 2.5V. Its 2.048V value is specifically chosen to align with binary full-scale ranges (e.g., 2.048V = 211 mV), making it ideal for direct interfacing with 12-bit ADCs. Substituting it for a 2.5V reference would introduce systematic gain error unless compensated in firmware or signal chain scaling.
LM4040D20IDBZT 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D20IDBZT FAQ
1.How can I place an order for LM4040D20IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D20IDBZT 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 LM4040D20IDBZT reliable?
The price and inventory of LM4040D20IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D20IDBZT is usually 5 days.
3.What payment methods are accepted for LM4040D20IDBZT?
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LM4040D20IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D20IDBZT 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 LM4040D20IDBZT?
For technical support, including LM4040D20IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D20IDBZT requirements.
6.How does Aetrix verify that LM4040D20IDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040D20IDBZT 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 LM4040D20IDBZT meets industry standards.
7.What is the process for return or replacement of LM4040D20IDBZT?
All LM4040D20IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D20IDBZT, 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 LM4040D20IDBZT part is unused and in its original packaging.
Return procedure for LM4040D20IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D20IDBZT Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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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
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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
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AZ431LANTR-G1
Diodes Incorporated
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