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Texas Instruments LM4040A20IDBZTG4
- Part No.:
- LM4040A20IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A20IDBZTG4.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,275
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Product details
Overview
LM4040A20IDBZTG4 from Texas Instruments is a precision micropower 2.048V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation, with ±0.1% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a stable reference in high-resolution ADCs and sensor signal chains requiring low drift and minimal quiescent current.
For engineers reviewing the LM4040A20IDBZTG4 datasheet, LM4040A20IDBZTG4 pinout, LM4040A20IDBZTG4 application, or LM4040A20IDBZTG4 equivalent, key selection criteria include initial tolerance at 25°C, thermal hysteresis (0.08%), dynamic impedance (0.3–0.8Ω), long-term stability (120ppm), and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040A20IDBZTG4 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 silicon design achieves tight initial tolerance via wafer-level fuse trimming, and its low dynamic impedance ensures minimal output variation under load transients.
It delivers stable regulation over cathode currents from 45μA to 15mA and across –40°C to 85°C ambient, with thermal hysteresis of only 0.08% and long-term drift of 120ppm after 1000 hours. The device requires no output capacitor and remains stable with all capacitive loads - a critical advantage in space-constrained, low-noise analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal at IZ = 100μA; enables exact binary-scaled references for 12-bit systems (e.g., 2.048V = 1 LSB × 2¹¹). |
| Initial Accuracy | ±0.1% max at 25°C; corresponds to ±2.05mV absolute error - sufficient for 12-bit accuracy without calibration. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±6.5mV drift over –40°C to 85°C (ΔT = 125°C), preserving 12-bit linearity. |
| Min Cathode Current | 45μA typical; supports ultra-low-power applications such as battery-backed sensors and energy-harvesting nodes. |
| Wideband Noise | 35μVRMS (10Hz–10kHz); low enough to avoid degrading ENOB in 16-bit SAR ADCs when used as reference. |
| Dynamic Impedance | 0.3–0.8Ω at IZ = 1mA; ensures <1mV output shift for 1mA load step - critical for precision DAC/ADC biasing. |
| Thermal Hysteresis | 0.08% max; limits repeatability error to ±1.64mV after thermal cycling - essential for metrology-grade instruments. |
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 2.048V drop between Cathode and Anode. |
| Anode (Pin 2) | Reference ground / common return | Typically tied to system ground; forms the 2.048V reference potential relative to Cathode. |
| NC (Pin 3) | No internal connection | Unused terminal; must be left floating or tied to Anode per TI recommendation in EMI-sensitive layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.048V output | Matches standard 12-bit full-scale range (2.048V = 1 LSB × 2¹¹), eliminating scaling resistors in data-acquisition designs. |
| Stable with all capacitive loads | Enables direct connection to ADC reference inputs or op-amp feedback networks without stability-compensation components. |
| Low 35μVRMS noise | Preserves SNR in precision measurement systems - e.g., adds <0.001 LSB RMS noise to a 16-bit 2.048V-range ADC. |
| 45μA min operating current | Supports always-on sensor biasing in sub-100μA power budgets, such as IoT node wake-up circuits or RTD excitation. |
| 0.08% thermal hysteresis | Ensures repeatable voltage after thermal cycling - critical for field-deployed instrumentation requiring recalibration intervals >1 year. |
Applications
| Industrial Sensor Transmitter | Portable Data Logger |
|---|---|
Use Scenario: 4–20mA loop-powered field transmitter conditioning thermocouple or RTD signals. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC and DAC in analog signal chain. Use Value: Enables 12-bit measurement resolution with <±0.5 LSB total error over temperature, meeting SIL-2 functional safety margins. |
Use Scenario: Battery-operated environmental monitor logging temperature/humidity every 10 seconds. IC Role / Device Role / Timing Role: Supplies reference voltage to ultra-low-power SAR ADC during brief active cycles. Use Value: 45μA minimum current allows operation from coin-cell batteries for >5 years; low noise avoids post-processing filtering. |
| Energy Metering Front-End | Medical Patient Monitor Analog Module |
Use Scenario: Polyphase electricity meter measuring voltage/current with 0.2% accuracy class compliance. IC Role / Device Role / Timing Role: Precision reference for metrology-grade ADC sampling grid voltage waveforms. Use Value: ±0.1% initial tolerance + 100ppm/°C TC ensures <0.25% total error over –25°C to 70°C operating range. |
Use Scenario: Portable ECG module digitizing biopotential signals with 16-bit resolution. IC Role / Device Role / Timing Role: Low-noise reference for ADC converting amplified differential leads. Use Value: 35μVRMS noise contributes <0.0017% of full-scale - below clinical noise floor requirements per IEC 60601-2-27. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040B20IDBZTG4 | ±0.2% initial accuracy (vs. ±0.1%); same 100ppm/°C TC, noise, and package. | Acceptable where 12-bit system calibration is performed; lower cost for non-critical channels. | Select when budget constraints outweigh need for uncalibrated 12-bit linearity. |
| REF3020AIDBZR | 2.048V series reference; 50ppm/°C TC, 25μVRMS noise, but requires ≥50μA supply current and external bypass cap. | Used where low-output-impedance sourcing is needed; incompatible with shunt-based topologies. | Choose only if system architecture mandates series reference configuration and can accommodate extra layout area. |
Compared with LM4040B20IDBZTG4, the LM4040A20IDBZTG4 provides tighter initial accuracy for calibration-free 12-bit performance; compared with REF3020AIDBZR, it offers simpler two-terminal integration and zero external component count - critical for miniaturized, high-reliability analog modules.
Availability
LM4040A20IDBZTG4 is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable data loggers, energy metering front-ends, and medical patient monitor analog modules requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040A20IDBZTG4 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 reliability.
The LM4040 series was engineered for cost-sensitive, space-constrained applications demanding micropower operation and high DC accuracy - especially in industrial automation, energy infrastructure, and portable instrumentation.
FAQ
What is the maximum cathode current rating for LM4040A20IDBZTG4?
The LM4040A20IDBZTG4 has an absolute maximum cathode current of 25mA per its Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability or temperature coefficient performance. For continuous operation, staying within 15mA ensures specified accuracy and thermal behavior.
Does LM4040A20IDBZTG4 require an output capacitor for stability?
No, the LM4040A20IDBZTG4 is explicitly designed to be stable with all capacitive loads and does not require an output capacitor. This is confirmed in both the Features list ("Stable with all capacitive loads; no output capacitor required") and the Description section. Adding one is unnecessary and may even degrade transient response in some configurations.
Can LM4040A20IDBZTG4 operate over the extended temperature range (–40°C to 125°C)?
No - the LM4040A20IDBZTG4 is characterized for the industrial temperature range of –40°C to 85°C only. The "Q" grade variants (e.g., LM4040A20Q) are qualified for –40°C to 125°C. Using the "I" grade part beyond 85°C risks exceeding its specified electrical characteristics and may violate reliability limits.
What is the purpose of Pin 3 (NC) on LM4040A20IDBZTG4?
Pin 3 of the LM4040A20IDBZTG4 is a no-connect terminal with no internal connection. TI recommends leaving it floating or connecting it to the Anode (Pin 2) in high-EMI environments - such as near transformers or switching regulators - to reduce noise coupling into the reference node.
How does the thermal hysteresis specification impact system calibration?
The LM4040A20IDBZTG4's thermal hysteresis is specified at 0.08%, meaning voltage measured at 25°C after cycling to –40°C differs by ≤±1.64mV from voltage measured at 25°C after cycling to 125°C. This directly affects calibration repeatability in field-deployed equipment; systems requiring sub-0.1% gain stability over thermal cycling must account for this hysteresis in their calibration algorithm or schedule.
LM4040A20IDBZTG4 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040A20IDBZTG4 FAQ
1.How can I place an order for LM4040A20IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A20IDBZTG4 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 LM4040A20IDBZTG4 reliable?
The price and inventory of LM4040A20IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A20IDBZTG4 is usually 5 days.
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LM4040A20IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040A20IDBZTG4 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 LM4040A20IDBZTG4?
For technical support, including LM4040A20IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A20IDBZTG4 requirements.
6.How does Aetrix verify that LM4040A20IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040A20IDBZTG4 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 LM4040A20IDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040A20IDBZTG4?
All LM4040A20IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A20IDBZTG4, 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 LM4040A20IDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040A20IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A20IDBZTG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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