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Texas Instruments LM4040D82IDBZR
- Part No.:
- LM4040D82IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D82IDBZR.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
LM4040D82IDBZR from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 8.192V output with ±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, capacitor-free reference in high-accuracy analog signal chains for industrial sensing and data acquisition.
For engineers reviewing the LM4040D82IDBZR datasheet, LM4040D82IDBZR pinout, LM4040D82IDBZR application, or LM4040D82IDBZR equivalent, key selection criteria include its 8.192V nominal output, D-grade tolerance and tempco, SOT-23-3 package compatibility, and guaranteed operation across –40°C to 85°C ambient temperatures.
Technical Context
The LM4040D82IDBZR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise reverse breakdown voltage (VZ) across its terminals. Its Zener-zap trimmed silicon design achieves 8.192V output without external components and remains stable under all capacitive loads.
It features low dynamic impedance (≤1.1Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm over 1000 hours - enabling reliable performance in precision ADC biasing, sensor excitation, and closed-loop calibration circuits where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal; enables exact binary-scaled reference for 13-bit ADCs and DACs |
| Initial Accuracy | ±1.0% max at 25°C; defines worst-case offset in factory-calibrated systems |
| Tempco | 150ppm/°C max; contributes ≤±1.2mV/°C drift over operating range |
| Min Cathode Current | 45μA typical; supports ultra-low-power battery-operated designs |
| Noise (10Hz–10kHz) | 35μVRMS typical; avoids introducing measurable error in 16-bit+ measurement systems |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures <1mV output shift under 1mA load transients |
| Operating Temp Range | –40°C to +85°C; qualified for industrial environments without derating |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient, compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input | Connects to regulated supply rail; sinks IZ to establish VZ across anode–cathode |
| Anode (Pin 2) | Common reference node | Typically tied to system ground; defines 0V reference point for VZ |
| NC (Pin 3) | No internal connection | Must be left floating or connected to anode per EMI-sensitive layouts |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free operation | Stable with any capacitive load; eliminates BOM cost and layout area for output capacitor |
| Micropower startup | 45μA minimum cathode current enables use in energy-harvesting and battery-life-critical systems |
| Low noise performance | 35μVRMS noise floor preserves SNR in high-resolution data converters without filtering overhead |
| Wide current range | Operates from 45μA to 15mA; accommodates both standby and full-scale signal chain loads |
| Thermal hysteresis control | 0.08% hysteresis ensures repeatable voltage after thermal cycling - critical for recalibration stability |
Applications
| Industrial Data Acquisition | Energy Infrastructure Monitoring |
|---|---|
Use Scenario: High-accuracy voltage reference for 16-bit SAR ADCs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Shunt reference providing stable 8.192V reference to ADC VREF pin, enabling full-scale resolution matching 213. Use Value: ±1.0% initial accuracy and 150ppm/°C tempco ensure <±0.5 LSB total error over –40°C to 85°C without software calibration. | Use Scenario: Reference source for isolation amplifier feedback in smart grid metering front-ends. IC Role / Device Role / Timing Role: Precision shunt reference supplying excitation voltage to current-sense resistors and isolation amplifier inputs. Use Value: 35μVRMS noise prevents degradation of sub-0.1% metering accuracy; SOT-23-3 footprint eases creepage/clearance compliance. |
| Field Transmitter Calibration | Precision Audio Level Control |
Use Scenario: On-board reference for 4–20mA loop-powered transmitter DACs requiring traceable voltage scaling. IC Role / Device Role / Timing Role: Fixed 8.192V reference used to generate calibrated 1.024V or 2.048V sub-references via resistor dividers. Use Value: Low 45μA min current allows operation within 3.5mA loop budget; long-term stability (120ppm/1000h) reduces field recalibration frequency. | Use Scenario: Reference for digitally controlled analog gain stages in studio-grade microphone preamplifiers. IC Role / Device Role / Timing Role: Stable DC reference defining absolute gain step sizes in PGA ICs and analog potentiometer circuits. Use Value: 0.08% thermal hysteresis prevents audible "popping" during thermal cycling; 8.192V enables exact binary-ratio scaling for digital control interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C82IDBZR | Same 8.192V output, ±0.5% initial accuracy (C grade), 100ppm/°C tempco, 45μA min current | Higher accuracy and lower drift; requires tighter layout for ESD robustness (HBM ±1500V vs. LM4040's ±2000V) | Select when system-level accuracy demands <±0.5% reference error over temperature |
| MAX6008AEUR+T | 8.192V output, ±0.2% initial accuracy, 75ppm/°C tempco, 60μA min current, SC70-3 package | Lower tempco and higher accuracy but larger min current; SC70-3 footprint differs from SOT-23-3 | Select when board space permits SC70 and long-term drift must be minimized below 50ppm/1000h |
Compared with TL4050C82IDBZR and MAX6008AEUR+T, the LM4040D82IDBZR trades initial accuracy and tempco for broader current range, superior ESD rating, and direct SOT-23-3 compatibility - making it optimal for cost-sensitive industrial designs where ±1% tolerance is acceptable and layout simplicity is prioritized.
Availability
LM4040D82IDBZR is available at Aetrix Electronics and suitable for industrial data acquisition, energy infrastructure monitoring, and field transmitter applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM4040D82IDBZR 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 specifically for space-constrained, low-power, high-accuracy analog systems - delivering stable shunt references without external capacitors while supporting industrial temperature ranges and demanding long-term stability requirements.
FAQ
What is the output voltage tolerance of the LM4040D82IDBZR over temperature?
The LM4040D82IDBZR has a maximum initial accuracy of ±1.0% at 25°C and a temperature coefficient of 150ppm/°C. Over its full operating range of –40°C to +85°C, the total output voltage tolerance is ±2.5% (±1.0% ±150ppm/°C × 100°C), equating to ±205mV on the 8.192V output. This is confirmed in Section 6.20 of the TI datasheet SLOS456Q.
Does the LM4040D82IDBZR require an output capacitor for stability?
No, the LM4040D82IDBZR is inherently stable with all capacitive loads and does not require an external output capacitor. Its internal design ensures stability regardless of PCB trace capacitance or downstream filter caps - a key advantage over series references. This behavior is explicitly stated in the Features and Description sections of the LM4040 datasheet.
What is the minimum cathode current needed for regulation in the LM4040D82IDBZR?
The LM4040D82IDBZR requires a minimum cathode current of 45μA (typical) to maintain regulation. At 25°C, the specified minimum is 45μA; over the full –40°C to +85°C range, it increases to 80μA. This low current enables use in ultra-low-power applications such as battery-backed sensors and energy-harvesting nodes.
How does the LM4040D82IDBZR compare to the LM4040C82IDBZR in terms of accuracy and temperature drift?
The LM4040D82IDBZR offers ±1.0% initial accuracy and 150ppm/°C temperature coefficient, while the LM4040C82IDBZR provides ±0.5% initial accuracy and 100ppm/°C tempco. Both share identical 8.192V output, noise (35μVRMS), and package (SOT-23-3). The D-grade part is optimized for cost-sensitive applications where ±1% tolerance is sufficient.
Is the LM4040D82IDBZR suitable for automotive applications?
The LM4040D82IDBZR is rated for –40°C to +85°C operation (industrial grade), not the extended –40°C to +125°C required for most automotive under-hood applications. For automotive use, TI recommends the LM4040D82IQDBZR (Q-grade variant), which is qualified to AEC-Q100 and specified across –40°C to +125°C ambient temperature.
LM4040D82IDBZR 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 130µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 115 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D82IDBZR FAQ
1.How can I place an order for LM4040D82IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D82IDBZR 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 LM4040D82IDBZR reliable?
The price and inventory of LM4040D82IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D82IDBZR is usually 5 days.
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Once your LM4040D82IDBZR 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 LM4040D82IDBZR?
For technical support, including LM4040D82IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D82IDBZR requirements.
6.How does Aetrix verify that LM4040D82IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040D82IDBZR 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 LM4040D82IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040D82IDBZR?
All LM4040D82IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D82IDBZR, 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 LM4040D82IDBZR part is unused and in its original packaging.
Return procedure for LM4040D82IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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