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Texas Instruments LM4040A82IDBZT
- Part No.:
- LM4040A82IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A82IDBZT.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,733
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Product details
Overview
LM4040A82IDBZT from Texas Instruments is a precision micropower shunt voltage reference with 8.192V nominal output, ±0.1% initial accuracy (A grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current - used in high-accuracy analog input modules and data-acquisition systems requiring low-drift references.
For engineers reviewing the LM4040A82IDBZT datasheet, LM4040A82IDBZT pinout, LM4040A82IDBZT application, or LM4040A82IDBZT equivalent, this page delivers verified specifications, SOT-23-3 package details, thermal hysteresis (0.08%), long-term stability (120ppm), and real-world design implications for industrial and automotive signal conditioning circuits.
Technical Context
The LM4040A82IDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 8.192V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed silicon junction delivers tight initial tolerance and low dynamic impedance (0.8Ω typical at 1mA).
It requires no external capacitor, remains stable with all capacitive loads, and achieves thermal hysteresis of only 0.08% over –40°C to 85°C ambient - enabling reliable performance in field transmitters and energy infrastructure monitoring where ambient cycling occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal at IZ = 100μA - matches binary-scaled 213 mV for 13-bit DAC/ADC full-scale alignment. |
| Initial Accuracy | ±0.1% max at 25°C - enables <±8.2mV absolute error without calibration in precision sensor front-ends. |
| Tempco | 100ppm/°C max - contributes ≤±0.53mV drift over –40°C to 85°C ambient range. |
| Noise (10Hz–10kHz) | 35μVRMS typical - supports <16-bit ENOB in low-frequency data acquisition without added filtering. |
| Min Cathode Current | 45μA typical - allows ultra-low-power operation in battery-powered IoT sensor nodes. |
| Dynamic Impedance | 0.8Ω typical at 1mA - ensures <6mV output shift under 7.5mA load transients in analog input protection circuits. |
| Long-Term Stability | 120ppm after 1000 hours - corresponds to <±1mV drift over first year in sealed industrial enclosures. |
Pinout & Package
LM4040A82IDBZT is packaged in a 3-pin SOT-23 (DBZ) surface-mount package measuring 2.92mm × 1.30mm. The device uses a two-terminal shunt configuration with an optional third terminal for EMI mitigation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks all cathode current (IZ) to maintain 8.192V drop relative to anode. |
| Anode (Pin 2) | Reference ground / common return | Typically tied to system ground; forms the 0V reference point for the 8.192V output measured at cathode. |
| NC (Pin 3) | No internal connection | Must float or connect to anode per TI recommendation in high-EMI environments (e.g., near motor drives or SMPS). |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load up to 10μF - eliminates BOM cost and layout area for external stabilization caps. |
| Micropower start-up | 45μA minimum cathode current - enables use with high-value series resistors (>1MΩ) in ultra-low-quiescent monitoring circuits. |
| Extended temperature range | Rated for –40°C to +85°C ambient - qualified for industrial control cabinets and automotive under-hood sensor interfaces. |
| Low thermal hysteresis | 0.08% max - ensures repeatable 8.192V output after thermal cycling between –40°C and +125°C, critical for field calibration integrity. |
| Fuse-trimmed Zener | Wafer-sort trim via Zener-zap process - guarantees A-grade 0.1% tolerance without post-package adjustment or laser trimming. |
Applications
| Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: High-resolution 16-bit ADC front-end in programmable logic controller (PLC) analog input cards. IC Role / Device Role / Timing Role: Provides stable 8.192V reference for ratiometric scaling of ±10V sensor inputs. Use Value: Enables full-scale utilization of 13-bit binary-aligned ADC codes without software gain correction. |
Use Scenario: Portable battery-powered environmental monitor logging temperature, humidity, and gas concentration. IC Role / Device Role / Timing Role: Supplies precision reference to sigma-delta ADC during low-duty-cycle sampling bursts. Use Value: Delivers 35μVRMS noise floor and 45μA min current to extend battery life beyond 5 years at 1-sample/minute rate. |
| Field Transmitter | Energy Infrastructure |
Use Scenario: 4–20mA HART-enabled pressure transmitter operating in oil & gas wellhead environments. IC Role / Device Role / Timing Role: Sets excitation voltage for bridge sensors and reference for loop-current DAC. Use Value: 100ppm/°C tempco and 0.08% thermal hysteresis ensure <0.1% FS error over –40°C to +85°C ambient swings. |
Use Scenario: Smart electricity meter with anti-tampering detection and revenue-grade metrology. IC Role / Device Role / Timing Role: References metrology ADC and provides bias for isolation amplifier feedback paths. Use Value: 120ppm long-term stability meets IEC 62053-21 Class 0.2 accuracy requirements over 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040B82IDBZT | ±0.2% initial accuracy, same 100ppm/°C tempco and 35μVRMS noise | Acceptable where system calibration compensates for ±16.4mV offset at 8.192V | Select for cost-sensitive industrial designs where post-calibration is standard practice. |
| REF3082AIDBZR | 8.20V output, ±0.2% accuracy, 50ppm/°C tempco, higher 50μVRMS noise, 50μA min current | Requires layout revision due to different pinout (SOT-23-5) and higher noise floor | Choose when lower tempco is prioritized over noise and initial accuracy in extended-temp applications. |
Compared with LM4040B82IDBZT, the LM4040A82IDBZT reduces initial offset error by half - critical for uncalibrated field instruments; compared with REF3082AIDBZR, it offers lower noise and tighter initial tolerance but trades off slightly higher tempco and no enable pin.
Availability
LM4040A82IDBZT is available at Aetrix Electronics and suitable for analog input modules, data-acquisition systems, and field transmitters requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for LM4040A82IDBZT 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in industrial automation, test equipment, and energy metering - emphasizing micropower operation, zero-capacitor stability, and wafer-level trimming for grade-specific tolerances.
FAQ
What is the maximum cathode current rating for LM4040A82IDBZT?
The LM4040A82IDBZT has an absolute maximum cathode current (IZ) of 25mA per its Absolute Maximum Ratings table. However, the recommended operating condition specifies a maximum of 15mA to ensure thermal reliability within the SOT-23 package's 206°C/W junction-to-ambient thermal resistance. Exceeding 15mA risks exceeding the 150°C maximum junction temperature, especially above 60°C ambient.
Does LM4040A82IDBZT require an external output capacitor?
No, the LM4040A82IDBZT is explicitly designed to be stable with all capacitive loads and requires no external output capacitor. This is confirmed in both the Features list ("Stable with all capacitive loads; no output capacitor required") and the Description section. Adding capacitance does not harm stability but provides no benefit for noise reduction or transient response in standard configurations.
What is the purpose of Pin 3 (NC) on LM4040A82IDBZT?
Pin 3 on the LM4040A82IDBZT is a no-connect terminal with no internal connection. TI recommends leaving it floating or connecting it directly to the anode (Pin 2) in high-EMI environments - such as near transformers or switching power supplies - to reduce noise coupling into the reference node and improve long-term voltage stability under electromagnetic stress.
How does the 8.192V output of LM4040A82IDBZT benefit data-conversion systems?
The 8.192V output of LM4040A82IDBZT equals 213 mV, providing exact binary alignment with 13-bit resolution systems. When used with a 13-bit ADC having a 0–8192mV input range, each LSB corresponds precisely to 1mV - eliminating code misalignment errors and simplifying firmware scaling in digital multimeters and precision data loggers.
Is LM4040A82IDBZT suitable for automotive applications?
The LM4040A82IDBZT is rated for –40°C to +85°C operation (industrial temperature grade), making it suitable for cabin-located automotive electronics like infotainment sensor interfaces or body-control modules. It is not qualified to AEC-Q100 Grade 1 (–40°C to +125°C) or Grade 0, so it is not recommended for under-hood or powertrain applications requiring extended temperature validation.
LM4040A82IDBZT 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):
- 8.192V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 130µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 110 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040A82IDBZT FAQ
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The price and inventory of LM4040A82IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A82IDBZT is usually 5 days.
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For technical support, including LM4040A82IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A82IDBZT requirements.
6.How does Aetrix verify that LM4040A82IDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040A82IDBZT 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 LM4040A82IDBZT meets industry standards.
7.What is the process for return or replacement of LM4040A82IDBZT?
All LM4040A82IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A82IDBZT, 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 LM4040A82IDBZT part is unused and in its original packaging.
Return procedure for LM4040A82IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A82IDBZT Tags
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