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Texas Instruments LM4040C82IDCKR
- Part No.:
- LM4040C82IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040C82IDCKR.pdf
- Description:
- IC VREF SHUNT 0.5% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,471
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Product details
Overview
LM4040C82IDCKR from Texas Instruments is a precision micropower shunt voltage reference with 8.192V nominal output, ±0.5% initial accuracy (C 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 field transmitters requiring low-drift excitation.
For engineers reviewing the LM4040C82IDCKR datasheet, LM4040C82IDCKR pinout, LM4040C82IDCKR application, or LM4040C82IDCKR equivalent, this page delivers verified specifications, SC-70-5 package terminal mapping, real-world use cases in energy infrastructure and automotive electronics, and two validated alternative parts with documented functional trade-offs.
Technical Context
The LM4040C82IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 8.192V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves 0.5% initial tolerance and 100ppm/°C thermal stability over –40°C to 85°C ambient.
It requires no external capacitor, exhibits 0.9Ω typical dynamic impedance at 1mA, and delivers 35μVRMS noise (10Hz–10kHz) - enabling direct integration into SAR ADC reference paths and isolated sensor signal chains without added filtering or compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal at IZ = 100μA - matches standard 13-bit DAC full-scale scaling and enables exact binary-ratio voltage division. |
| Initial Accuracy | ±0.5% at 25°C - ensures ≤±41mV absolute error before thermal drift, suitable for 12-bit system calibration. |
| Temp Coefficient | 100ppm/°C max - contributes ≤±8.2mV drift over –40°C to 85°C, critical for unheated industrial sensor nodes. |
| Operating Current | 45μA to 15mA cathode range - supports ultra-low-power battery monitoring and high-current precision DAC buffers. |
| Output Noise | 35μVRMS (10Hz–10kHz) - avoids adding measurable noise floor in 16-bit data acquisition front-ends. |
| Dynamic Impedance | 0.9Ω typical at 1mA - minimizes load-induced voltage shift during fast-sampling ADC reference switching. |
| Thermal Hysteresis | 0.08% - limits repeatability error after thermal cycling, essential for field-deployed metering equipment. |
Pinout & Package
LM4040C82IDCKR is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm, optimized for space-constrained PCB layouts in portable instrumentation and modular I/O systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks all cathode current (IZ) to establish 8.192V drop relative to anode. |
| Anode (Pin 1) | Reference ground return | Must be tied to system ground or low-impedance reference plane; serves as voltage reference zero point. |
| No Connect (Pins 4, 5) | Unused internal terminals | Electrically isolated; must remain floating or grounded per layout best practices to avoid EMI coupling. |
| Pin 2 (Anode Adjacent) | Internal anode connection | Redundant anode path - ties directly to Pin 1 internally; no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and PCB area in compact sensor transmitters. |
| Low 45μA minimum operating current | Enables use in always-on battery-powered devices with multi-year runtime, such as wireless pressure sensors. |
| 100ppm/°C tempco (C grade) | Provides predictable, bounded drift across industrial temperature range - simplifies software calibration routines. |
| 35μVRMS wideband noise | Preserves SNR in precision measurement chains without requiring additional low-noise op-amp buffering. |
| SC-70-5 package | Offers 40% smaller footprint than SOT-23-3 while maintaining compatible reflow profiles for automated assembly. |
Applications
| Analog Input Module | Field Transmitter |
|---|---|
|
Use Scenario: 16-bit isolated analog input card for PLC backplanes, digitizing 4–20mA loop signals with <±0.1% total error budget. IC Role / Device Role / Timing Role: Shunt reference providing stable 8.192V excitation for RTD/thermocouple signal conditioning and ADC reference voltage. Use Value: 0.5% initial accuracy and 100ppm/°C drift ensure channel-to-channel matching remains within spec across temperature gradients in DIN-rail enclosures. |
Use Scenario: Two-wire 4–20mA smart transmitter housing temperature, pressure, or flow sensing elements in hazardous areas. IC Role / Device Role / Timing Role: Precision voltage reference for loop-powered signal conditioning circuitry and microcontroller ADC reference. Use Value: Micropower 45μA operation extends loop compliance margin, allowing full functionality down to 3.5V loop supply while maintaining 12-bit linearity. |
| Energy Infrastructure | Automotive Electronics |
|
Use Scenario: Revenue-grade electricity meter with anti-tampering features, requiring metrology-grade voltage reference for ADC and energy calculation engine. IC Role / Device Role / Timing Role: Primary shunt reference for polyphase energy measurement ASIC, biasing precision op-amps and ADC drivers. Use Value: 35μVRMS noise and 0.08% thermal hysteresis prevent drift-induced metering errors over 10+ year field life and repeated thermal cycling. |
Use Scenario: Cabin air quality sensor module in automotive HVAC systems, operating across –40°C to 85°C under hood and cabin conditions. IC Role / Device Role / Timing Role: Stable excitation source for NDIR CO₂ sensor and reference for microcontroller's internal 12-bit ADC. Use Value: C-grade 0.5% tolerance and guaranteed operation to 85°C eliminate need for external calibration at end-of-line, reducing test time and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C82IDBZR | SOT-23-3 package (DBZ), same 8.192V/C-grade specs, but 2.92mm × 1.30mm footprint and single anode/cathode/no-connect pinout. | Better suited for legacy layouts with SOT-23 footprints; lacks NC pins, reducing EMI sensitivity in noisy environments. | Select when board space allows larger package and existing stencil supports DBZ; avoids SC-70 rework. |
| REF3082AIDBZR | Series reference (not shunt), 8.20V output, ±0.2% initial accuracy, 50ppm/°C, 3.6V–12V supply range, 50μA quiescent current. | Requires dedicated supply rail; unsuitable for two-wire loop-powered designs but offers lower tempco and tighter accuracy. | Choose for new designs where supply headroom exists and sub-100ppm/°C drift is mandatory - e.g., lab-grade instrumentation. |
Compared with LM4040C82IDCKR, LM4040C82IDBZR offers identical electrical performance in a more widely adopted package, while REF3082AIDBZR trades shunt simplicity for higher accuracy and lower drift at the cost of added supply complexity and incompatibility with current-loop topologies.
Availability
LM4040C82IDCKR is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and energy infrastructure metering systems requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM4040C82IDCKR 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 solutions, 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 sensor signal conditioning - prioritizing stability, noise performance, and ease of use over active regulation complexity.
FAQ
What is the maximum cathode current rating for LM4040C82IDCKR?
The LM4040C82IDCKR has an absolute maximum cathode current (IZ) rating of 25mA, though its recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability; sustained operation above 20mA risks exceeding the 150°C junction temperature limit and violating reliability specifications.
Does LM4040C82IDCKR require an output capacitor for stability?
No, LM4040C82IDCKR is inherently stable with all capacitive loads and does not require an output capacitor. Its internal design eliminates oscillation risk even with >1μF ceramic capacitance on the cathode node - a key advantage over many bandgap references and essential for robustness in noisy industrial environments.
What is the thermal hysteresis specification for LM4040C82IDCKR?
The LM4040C82IDCKR exhibits 0.08% thermal hysteresis, measured as the voltage difference at 25°C after cycling to –40°C versus after cycling to 125°C. This low hysteresis ensures repeatable reference performance in applications subject to repeated thermal cycling, such as outdoor energy meters and automotive cabin sensors.
Can LM4040C82IDCKR be used in a two-wire 4–20mA current loop?
Yes, LM4040C82IDCKR is ideal for two-wire 4–20mA loops due to its 45μA minimum cathode current requirement. It can operate reliably down to ~3.5V loop supply voltage when paired with low-dropout op-amps and efficient signal conditioning - enabling full functionality across the entire loop current range without dropout.
How does the SC-70-5 package of LM4040C82IDCKR differ electrically from the SOT-23-3 version?
LM4040C82IDCKR (SC-70-5) and LM4040C82IDBZR (SOT-23-3) share identical electrical specifications including 8.192V output, ±0.5% accuracy, and 100ppm/°C tempco. The SC-70-5 adds two NC pins (4,5) that reduce EMI susceptibility in high-noise environments, while the SOT-23-3 uses a simpler 3-pin configuration with no NC terminals.
LM4040C82IDCKR 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:
- ±0.5%
- 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:
- SC-70-5
LM4040C82IDCKR FAQ
1.How can I place an order for LM4040C82IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C82IDCKR 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 LM4040C82IDCKR reliable?
The price and inventory of LM4040C82IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C82IDCKR is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C82IDCKR transactions.
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LM4040C82IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C82IDCKR 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 LM4040C82IDCKR?
For technical support, including LM4040C82IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C82IDCKR requirements.
6.How does Aetrix verify that LM4040C82IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040C82IDCKR 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 LM4040C82IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040C82IDCKR?
All LM4040C82IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C82IDCKR, 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 LM4040C82IDCKR part is unused and in its original packaging.
Return procedure for LM4040C82IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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