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Texas Instruments LM4040D82IDCKR
- Part No.:
- LM4040D82IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040D82IDCKR.pdf
- Description:
- IC VREF SHUNT 1% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,166
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Product details
Overview
LM4040D82IDCKR from Texas Instruments is a precision micropower shunt voltage reference with a fixed 8.192V output, D-grade (±1.0% initial tolerance, 150ppm/°C tempco), rated for –40°C to 85°C operation, packaged in SC-70-5, and designed for high-accuracy analog signal conditioning in data-acquisition systems.
For engineers reviewing the LM4040D82IDCKR datasheet, LM4040D82IDCKR pinout, LM4040D82IDCKR application, or LM4040D82IDCKR equivalent, key selection criteria include cathode current range (45μA–15mA), low 35μVRMS noise, stability with all capacitive loads, thermal hysteresis (0.08%), and dynamic impedance (≤1.1Ω at 1mA).
Technical Context
The LM4040D82IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to regulate voltage across its terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming to achieve D-grade accuracy, with temperature compensation maintaining output stability over –40°C to 85°C.
It requires no external capacitor, exhibits low dynamic impedance (≤1.1Ω), and delivers stable performance across wide cathode current (45μA–15mA) and load capacitance ranges - enabling direct integration into precision ADC biasing, sensor excitation, and calibration circuits without layout constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal; enables exact binary-scaled reference for 13-bit+ SAR ADCs and digital-to-analog calibration. |
| Initial Tolerance | ±1.0% max at 25°C; defines worst-case DC offset in closed-loop sensor signal chains before trimming. |
| Tempco | 150ppm/°C max; contributes ≤±0.12% error over full –40°C to 85°C range, critical for outdoor industrial sensors. |
| Cathode Current Range | 45μA to 15mA; supports ultra-low-power IoT nodes (e.g., battery-powered transmitters) and higher-drive applications. |
| Output Noise | 35μVRMS (10Hz–10kHz); limits effective resolution in 24-bit delta-sigma ADC front-ends. |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures minimal load-regulation error when driving varying ADC input capacitance. |
| Thermal Hysteresis | 0.08% max; prevents repeatability drift after thermal cycling in field-deployed instrumentation. |
Pinout & Package
LM4040D82IDCKR is housed in a 5-pin SC-70 (DCK) package measuring 2.00mm × 1.25mm. Pin 1 = Anode (ground reference), Pin 3 = Cathode (voltage output terminal), Pins 4–5 = No Internal Connection (NC). Pin 2 is marked "*" and must float or connect to anode in high-EMI environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Common reference node; connected to system ground to establish shunt reference potential. |
| Pin 3 | Cathode | Output terminal; sinks current to maintain regulated 8.192V between cathode and anode. |
| Pins 4, 5 | NC | No internal connection; must remain unconnected or tied to ground per layout best practices. |
| Pin 2 (*) | Guard/EMI Shield | Float by default; tie to anode only if placed near transformers or high-frequency switchers to suppress noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 8.192V output | Enables precise binary-aligned scaling for 13-bit systems (2¹³ = 8192), eliminating gain-trim components in data converters. |
| Stable with all capacitive loads | Removes need for output capacitor - simplifies PCB layout and eliminates capacitor-induced phase shift in feedback paths. |
| 45μA minimum operating current | Supports operation from microamp-level bias sources, e.g., low-power op-amp buffers or energy-harvesting circuits. |
| Low 35μVRMS noise | Preserves SNR in high-resolution measurement systems; avoids noise floor elevation in 24-bit sigma-delta ADC references. |
| D-grade accuracy (±1.0%) | Provides cost-optimized precision for applications where post-calibration compensates initial error, such as factory-set instruments. |
Applications
| Data-Acquisition Systems | Field Transmitters |
|---|---|
Use Scenario: High-resolution analog input modules digitizing 4–20mA sensor signals in PLC backplanes. IC Role / Device Role / Timing Role: Shunt reference providing stable 8.192V excitation and ADC reference for 16-bit+ SAR converters. Use Value: Enables ±0.5 LSB integral nonlinearity without calibration, leveraging binary-aligned voltage for simplified firmware scaling. |
Use Scenario: Loop-powered 4–20mA transmitters in oil & gas remote monitoring with ambient temperature swings. IC Role / Device Role / Timing Role: Primary voltage reference for current-loop DAC and sensor signal conditioning circuitry. Use Value: Maintains <±0.2% total error over –40°C to 85°C due to tight tempco and low thermal hysteresis. |
| Analog Input Module | Energy Infrastructure |
Use Scenario: Modular I/O cards in industrial controllers requiring multi-channel simultaneous sampling. IC Role / Device Role / Timing Role: Per-channel reference source for multiplexed ADC front-ends with independent gain stages. Use Value: Low dynamic impedance (<1.1Ω) prevents crosstalk-induced gain error during channel switching. |
Use Scenario: Smart meter voltage sensing and anti-tampering detection circuits operating at line voltage potentials. IC Role / Device Role / Timing Role: Isolated reference generator for high-side voltage dividers feeding isolated sigma-delta modulators. Use Value: Stable operation up to 15mA cathode current allows robust biasing through high-value isolation resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C82IDCKR | 0.5% initial tolerance, 100ppm/°C tempco - tighter accuracy but higher cost. | Better suited for uncalibrated portable test equipment requiring <±0.1% total error. | Select when long-term stability and reduced thermal drift outweigh cost sensitivity. |
| REF3082AIDBZR | 8.192V series reference; 0.2% tolerance, 50ppm/°C, 50μA quiescent current, SOT-23-3 package. | Requires input headroom; not a drop-in replacement but offers lower noise (25μVRMS) and better PSRR. | Choose for battery-powered systems needing ultra-low noise and supply rejection, accepting added complexity. |
Compared with LM4040C82IDCKR, the LM4040D82IDCKR trades 0.5% initial accuracy for lower unit cost and identical thermal hysteresis; versus REF3082AIDBZR, it eliminates input voltage headroom requirements but has higher noise and no PSRR specification.
Availability
LM4040D82IDCKR is available at Aetrix Electronics and suitable for data-acquisition systems, field transmitters, and analog input modules requiring stable component supply with guaranteed long-term sourcing and TI-authorized traceability.
Supply support for LM4040D82IDCKR 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 instrumentation applications demanding micropower operation, wide temperature range, and robust capacitive-load stability.
FAQ
What is the maximum cathode current rating for LM4040D82IDCKR?
The absolute maximum cathode current for LM4040D82IDCKR is 25mA, but the recommended operating range is 45μA to 15mA per TI's datasheet Section 6.3. Operating above 15mA risks exceeding thermal limits in the SC-70 package, especially at elevated ambient temperatures. The LM4040D82IDCKR maintains specified accuracy and noise performance within this 15mA limit.
Does LM4040D82IDCKR require an output capacitor?
No, LM4040D82IDCKR is explicitly designed to be stable with all capacitive loads and does not require an output capacitor - a key differentiator from many series references. This eliminates capacitor-related aging, leakage, and layout sensitivity. TI confirms stability across 0pF to >100nF load capacitance in the LM4040 datasheet Section 3 and Figure 8-2.
What is the thermal hysteresis specification for LM4040D82IDCKR?
The thermal hysteresis of LM4040D82IDCKR is 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This value is consistent across all LM4040 grades and packages, and directly impacts repeatability in field-redeployed instrumentation where ambient temperature varies widely. The LM4040D82IDCKR achieves this via monolithic Zener structure and proprietary passivation.
Can LM4040D82IDCKR be used in automotive applications?
LM4040D82IDCKR is qualified for the industrial temperature range (–40°C to +85°C), not the AEC-Q200 automotive grade. While it may function in under-hood environments, TI does not guarantee performance or reliability beyond its specified industrial rating. For automotive use, consider the LM4040-Q1 variants (e.g., LM4040D82QDBZRQ1), which are explicitly qualified to AEC-Q100 Grade 3 (–40°C to +125°C) and include enhanced ESD and HTOL testing.
How does the 8.192V output of LM4040D82IDCKR benefit data-converter systems?
The 8.192V output of LM4040D82IDCKR corresponds exactly to 2¹³ mV, enabling seamless full-scale mapping for 13-bit and higher-resolution ADCs and DACs without integer division or floating-point scaling in firmware. This simplifies calibration routines, reduces code size in resource-constrained microcontrollers, and eliminates quantization error introduced by non-binary reference voltages - a direct advantage realized in the LM4040D82IDCKR's target applications.
LM4040D82IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- SC-70-5
LM4040D82IDCKR FAQ
1.How can I place an order for LM4040D82IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D82IDCKR 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 LM4040D82IDCKR reliable?
The price and inventory of LM4040D82IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D82IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040D82IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D82IDCKR transactions.
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4.How is shipping managed for LM4040D82IDCKR?
LM4040D82IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D82IDCKR 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 LM4040D82IDCKR?
For technical support, including LM4040D82IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D82IDCKR requirements.
6.How does Aetrix verify that LM4040D82IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040D82IDCKR 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 LM4040D82IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040D82IDCKR?
All LM4040D82IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D82IDCKR, 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 LM4040D82IDCKR part is unused and in its original packaging.
Return procedure for LM4040D82IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D82IDCKR Tags
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TL431AIDBZR
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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