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Texas Instruments LM4040B82IDCKR
- Part No.:
- LM4040B82IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040B82IDCKR.pdf
- Description:
- IC VREF SHUNT 0.2% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,323
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Product details
Overview
LM4040B82IDCKR from Texas Instruments is a precision micropower shunt voltage reference with 8.192V nominal output, B-grade (±0.2% initial tolerance, 100ppm/°C tempco), SC-70-5 package, 45μA minimum cathode current, and 35μVRMS wideband noise - used for high-accuracy ADC/DAC biasing in industrial data-acquisition systems.
For engineers reviewing the LM4040B82IDCKR datasheet, LM4040B82IDCKR pinout, LM4040B82IDCKR application, or LM4040B82IDCKR equivalent, key selection criteria include output voltage accuracy over –40°C to 85°C, low-noise performance at microamp-level operating current, stability with capacitive loads, and compatibility with space-constrained PCB layouts requiring SC-70 footprint.
Technical Context
The LM4040B82IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 8.192V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed silicon design achieves ±0.2% initial accuracy and 100ppm/°C temperature coefficient over –40°C to 85°C.
It delivers 35μVRMS noise (10Hz–10kHz) at 100μA cathode current, exhibits ≤0.8mV output shift for IZ changes below 1mA, and maintains dynamic impedance of 0.3–0.9Ω - enabling precise voltage setting in low-power sensor signal chains without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal; enables exact binary-scaled reference for 13-bit ADCs and precision DACs |
| Initial Accuracy | ±0.2% max at 25°C; ensures <±16.4mV absolute error before temperature drift |
| Tempco | 100ppm/°C max; contributes ≤±8.2mV drift over –40°C to 85°C ambient range |
| Min Cathode Current | 45μA typical; supports ultra-low-power operation in battery-powered field transmitters |
| Wideband Noise | 35μVRMS (10Hz–10kHz); minimizes quantization uncertainty in high-resolution analog front-ends |
| Dynamic Impedance | 0.3–0.9Ω at 1mA; maintains voltage stability despite load current transients |
| Thermal Hysteresis | 0.08% max; limits repeatability error after thermal cycling in automotive ECUs |
Pinout & Package
LM4040B82IDCKR uses the SC-70-5 (DCK) package: 2.00mm × 1.25mm footprint, 0.65mm pitch, 5-pin configuration with two NC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input | Connects to regulated node; sinks current to clamp voltage at 8.192V |
| Anode (Pin 1) | Common reference terminal | Typically grounded; forms return path for cathode current |
| NC (Pins 4, 5) | No internal connection | Must be left unconnected or tied to anode per EMI mitigation guidance |
| Pin 2 (*) | Internal Zener tap | Must float or connect to anode; improves EMI immunity near switching noise sources |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies layout in compact analog modules |
| Low 35μVRMS noise | Reduces effective number of bits (ENOB) degradation in 16-bit+ data converters |
| 45μA min operating current | Enables direct use with microamp-level current sources in isolated sensor interfaces |
| –40°C to 85°C operation | Qualified for industrial control cabinets and outdoor energy infrastructure enclosures |
| SC-70-5 package | Provides 40% smaller footprint than SOT-23-3 while retaining 5-pin flexibility for EMI tuning |
Applications
| Industrial Data-Acquisition Systems | Energy Infrastructure Monitoring |
|---|---|
Use Scenario: High-channel-count PLC analog input modules digitizing 4–20mA sensor signals. IC Role / Device Role / Timing Role: Shunt reference providing stable 8.192V excitation and ADC reference for 13-bit resolution. Use Value: Enables ±0.2% system gain accuracy over temperature without calibration, reducing test time and firmware complexity. | Use Scenario: Smart meter voltage sensing and anti-tampering detection circuits. IC Role / Device Role / Timing Role: Precision bias source for isolation amplifiers and voltage dividers feeding metrology ADCs. Use Value: Maintains <±0.01% long-term stability (120ppm/1000h), ensuring revenue-grade measurement compliance. |
| Field Transmitters | Automotive Battery Management |
Use Scenario: Loop-powered 4–20mA transmitters in hazardous process environments. IC Role / Device Role / Timing Role: Low-current shunt reference establishing accurate current loop setpoints. Use Value: Operates reliably at 45μA minimum current, allowing full functionality even under lowest loop power conditions. | Use Scenario: Cell voltage monitoring in EV battery packs with distributed sensing nodes. IC Role / Device Role / Timing Role: Reference for 12-bit SAR ADCs measuring individual Li-ion cell voltages. Use Value: 100ppm/°C tempco ensures <±1.6mV error across –40°C to 85°C vehicle operating range. |
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 accuracy, same 100ppm/°C tempco and SC-70-5 package | Lower-cost option where ±41mV absolute error is acceptable | Select when BOM cost reduction outweighs need for tighter gain calibration |
| REF43FH82IDBVR | 8.192V series reference, ±0.05% accuracy, 3ppm/°C tempco, SOT-23-6 | Higher accuracy, lower drift, but requires external bypass capacitor and higher quiescent current | Choose for metrology-grade systems needing sub-10ppm/°C stability and zero-load current capability |
Compared with LM4040C82IDCKR, the LM4040B82IDCKR reduces initial gain error by 0.3% - critical for uncalibrated industrial sensors; versus REF43FH82IDBVR, it trades absolute precision for micropower operation and capacitor-free simplicity in space-constrained designs.
Availability
LM4040B82IDCKR is available at Aetrix Electronics and suitable for industrial data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040B82IDCKR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM4040 family was designed specifically for precision, low-power shunt reference applications in portable instrumentation, sensor interfaces, and industrial control systems where board space and quiescent current are constrained.
FAQ
What is the maximum cathode current rating for LM4040B82IDCKR?
The LM4040B82IDCKR has an absolute maximum cathode current rating of 25mA, per TI's Absolute Maximum Ratings table. Continuous operation above this level risks permanent damage. For reliable long-term performance, design cathode current within the recommended 45μA to 15mA range specified in Section 6.3 of the datasheet. The LM4040B82IDCKR must always operate with sufficient current to maintain regulation - typically ≥45μA at room temperature.
Does LM4040B82IDCKR require an output capacitor for stability?
No, the LM4040B82IDCKR is inherently stable with all capacitive loads and does not require an external output capacitor. This is explicitly stated in the Features section and confirmed in the Description: "Stable with all capacitive loads; no output capacitor required." The device's low dynamic impedance (0.3–0.9Ω) and internal compensation eliminate oscillation risk, simplifying layout in analog input modules and portable sensor nodes where board area is limited.
What is the thermal hysteresis specification for LM4040B82IDCKR?
The LM4040B82IDCKR has a thermal hysteresis of 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 per Section 6.5–6.22 of the datasheet. For the 8.192V output, this translates to ≤±6.55mV hysteresis error - critical for repeatable calibration in field-deployed test equipment using the LM4040B82IDCKR.
Can LM4040B82IDCKR be used in automotive applications?
The LM4040B82IDCKR is rated for operation from –40°C to +85°C (industrial grade), making it suitable for under-hood automotive applications with controlled thermal environments, such as body control modules or infotainment power supplies. However, it is not AEC-Q200 qualified. For engine bay or battery management systems requiring extended temperature operation up to 125°C, TI's LM4040B82IQDBVR (Q-grade) is the qualified alternative - the LM4040B82IDCKR itself is not intended for safety-critical automotive subsystems.
How does the noise performance of LM4040B82IDCKR compare to other shunt references?
The LM4040B82IDCKR delivers 35μVRMS wideband noise (10Hz–10kHz) at 100μA cathode current - matching the best-in-class noise floor of the LM4040 family and significantly lower than older shunt references like TL431 (typically >100μVRMS). This low noise directly improves effective resolution in 16-bit data acquisition systems. Measured noise is independent of grade (A/B/C/D) and package, and is validated in Section 6.5–6.22 electrical characteristics tables for all LM4040B82x variants.
LM4040B82IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 8.192V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- 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
LM4040B82IDCKR FAQ
1.How can I place an order for LM4040B82IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B82IDCKR 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 LM4040B82IDCKR reliable?
The price and inventory of LM4040B82IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B82IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040B82IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B82IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040B82IDCKR?
LM4040B82IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B82IDCKR 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 LM4040B82IDCKR?
For technical support, including LM4040B82IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B82IDCKR requirements.
6.How does Aetrix verify that LM4040B82IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040B82IDCKR 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 LM4040B82IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040B82IDCKR?
All LM4040B82IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B82IDCKR, 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 LM4040B82IDCKR part is unused and in its original packaging.
Return procedure for LM4040B82IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040B82IDCKR Tags
-
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
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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