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Texas Instruments LM4040A41IDCKR
- Part No.:
- LM4040A41IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040A41IDCKR.pdf
- Description:
- IC VREF SHUNT 0.1% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,243
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Product details
Overview
LM4040A41IDCKR from Texas Instruments is a precision micropower shunt voltage reference with 4.096V nominal output, 0.1% initial accuracy (A grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-drift reference in high-resolution ADC biasing and sensor signal conditioning circuits.
For engineers reviewing the LM4040A41IDCKR datasheet, LM4040A41IDCKR pinout, LM4040A41IDCKR application, or LM4040A41IDCKR equivalent, this page delivers verified specifications, SC-70 package details, thermal hysteresis (0.08%), dynamic impedance (0.3–0.9Ω), and real-world use cases in energy infrastructure and field transmitters.
Technical Context
The LM4040A41IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 4.096V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves 0.1% initial tolerance at 25°C and maintains stability over –40°C to 85°C ambient temperature.
It requires no external capacitor for stability, exhibits low dynamic impedance (<0.9Ω at 1mA), and delivers consistent performance across capacitive loads - enabling direct integration into space-constrained analog front-ends without compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; enables exact 12-bit full-scale scaling in 5V-supplied SAR ADCs without gain calibration. |
| Initial Accuracy | ±0.1% at 25°C; reduces system-level offset error to ≤4.1mV, critical for <0.01% measurement fidelity. |
| Tempco | 100ppm/°C max; contributes ≤±0.041V drift over –40°C to 85°C, supporting industrial-grade repeatability. |
| Noise (10Hz–10kHz) | 35μVRMS typical; avoids quantization noise floor elevation in 16-bit+ data acquisition systems. |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-backed sensor nodes and portable instrumentation. |
| Dynamic Impedance | 0.3Ω typical at 1mA; ensures minimal load-induced voltage shift during fast-sampling ADC reference switching. |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycling; guarantees repeatable voltage after thermal stress in automotive ECUs. |
Pinout & Package
LM4040A41IDCKR is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm, optimized for high-density PCB layouts and automated assembly. The package includes two NC pins for mechanical robustness and layout flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks IZ to establish 4.096V drop relative to anode. |
| Anode (Pin 1) | Reference ground return | Must be tied to system ground or low-impedance analog common; defines voltage reference point. |
| NC (Pins 4, 5) | No internal connection | May remain unconnected or grounded for EMI shielding; no electrical function or timing role. |
| Pin 2* | Optional anode tie | Float or connect to anode in high-noise environments (e.g., near switching regulators) to suppress coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies BOM and layout in compact sensor modules. |
| Low 35μVRMS noise | Preserves ENOB in 16-bit ADCs without requiring external filtering or averaging overhead. |
| 45μA minimum operating current | Enables continuous reference operation in sub-100μA IoT endpoints powered by coin cells. |
| 0.08% thermal hysteresis | Ensures voltage repeatability after thermal cycling in outdoor metering and automotive under-hood applications. |
| 100ppm/°C tempco (A grade) | Meets tight drift budgets in precision strain gauge bridges and RTD measurement front-ends. |
Applications
| Energy Infrastructure | Analog Input Module |
|---|---|
Use Scenario: High-accuracy voltage monitoring in smart grid protection relays and revenue-grade electricity meters. IC Role / Device Role / Timing Role: Provides stable 4.096V reference for 24-bit delta-sigma ADCs digitizing CT/PT secondary signals. Use Value: Enables ±0.1% energy measurement accuracy over –40°C to 85°C, meeting IEC 62053-21 Class 0.2 requirements. |
Use Scenario: Modular PLC analog input cards accepting 4–20mA, ±10V, and thermocouple inputs. IC Role / Device Role / Timing Role: Serves as master reference for programmable gain instrumentation amplifiers and multiplexed ADC drivers. Use Value: Maintains channel-to-channel gain matching <0.02% across temperature, eliminating per-channel calibration. |
| Field Transmitters | Precision Audio |
Use Scenario: Loop-powered 4–20mA transmitters in hazardous process control environments (e.g., chemical plants). IC Role / Device Role / Timing Role: Supplies excitation and reference for bridge sensors (load cells, pressure transducers) within strict 3.5mA loop budget. Use Value: Delivers 4.096V at 45μA - enabling full functionality while preserving >200Ω compliance voltage margin at 24V supply. |
Use Scenario: High-fidelity DAC reference in studio-grade audio converters and digital mixing consoles. IC Role / Device Role / Timing Role: Low-noise voltage reference for 20-bit R-2R or segmented DAC architectures. Use Value: 35μVRMS noise prevents audible hiss floor elevation; 0.1% accuracy ensures THD+N <–105dB at 1kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF4040A41IDBVR | Higher initial accuracy (±0.05%), lower noise (12μVRMS), but requires 100μA min current and larger SOT-23-5 package. | Better suited for metrology-grade instruments where 0.05% tolerance justifies cost and layout overhead. | Select REF4040A41IDBVR only if system demands <0.05% absolute accuracy and can support higher quiescent current. |
| ADR3440ARJZ-R7 | Series topology (3-pin), 4.096V output, ±0.1% accuracy, but needs ≥100μA supply current and external bypass cap. | Preferred in low-EMI designs where series references simplify grounding; unsuitable for shunt-based topologies. | Choose ADR3440ARJZ-R7 when board space permits 3-pin layout and system architecture supports series reference configuration. |
Compared with REF4040A41IDBVR and ADR3440ARJZ-R7, LM4040A41IDCKR offers the smallest footprint (SC-70), lowest minimum current (45μA), and inherent capacitive-load immunity - making it optimal for miniaturized, loop-powered, or ultra-low-power shunt reference implementations.
Availability
LM4040A41IDCKR is available at Aetrix Electronics and suitable for energy infrastructure monitoring, field transmitter design, and precision analog input modules requiring stable component supply across extended industrial temperature ranges.
Supply support for LM4040A41IDCKR 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 voltage references and signal chain solutions.
The LM4040 family was engineered for high-accuracy, low-power shunt reference applications in industrial, automotive, and instrumentation systems - prioritizing stability, noise performance, and ease of use in constrained layouts.
FAQ
What is the maximum cathode current rating for LM4040A41IDCKR?
The absolute maximum cathode current for LM4040A41IDCKR is 25mA, per TI's Absolute Maximum Ratings table. However, recommended operating conditions specify a maximum of 15mA to ensure long-term reliability and thermal stability within the SC-70 package's 252°C/W junction-to-ambient thermal resistance. Exceeding 15mA may elevate junction temperature beyond safe limits under typical PCB copper area assumptions.
Does LM4040A41IDCKR require an output capacitor for stability?
No, LM4040A41IDCKR is inherently stable with all capacitive loads and does not require an output capacitor. This is confirmed in TI's datasheet Features section and Section 7.3, which states "Stable with all capacitive loads; no output capacitor required." The device's low dynamic impedance and internal compensation eliminate oscillation risk even with >1μF ceramic or tantalum capacitors directly at the cathode.
What is the thermal hysteresis specification for LM4040A41IDCKR?
LM4040A41IDCKR 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 explicitly listed in Tables 6.5–6.22 of the datasheet for all LM4040A/B/C/D variants and applies identically to LM4040A41IDCKR, ensuring repeatable reference voltage after environmental stress.
Can LM4040A41IDCKR operate at 125°C ambient temperature?
No - LM4040A41IDCKR is rated for operation from –40°C to 85°C ambient (industrial grade, denoted by 'I' suffix). For 125°C operation, TI offers the LM4040A41QDBVR ('Q' grade), which is characterized over –40°C to 125°C and uses the same A-grade accuracy and 4.096V output but in a SOT-23-3 package. LM4040A41IDCKR must not be operated above 85°C ambient.
How does the 4.096V output of LM4040A41IDCKR benefit ADC interfacing?
The 4.096V output of LM4040A41IDCKR aligns precisely with binary scaling for 12-bit (4096 steps) and 16-bit (65536 steps) ADCs using 5V or 3.3V supplies. When paired with a 5V VDD, it enables full-scale utilization without gain-stage trimming - reducing component count and improving end-system accuracy in data loggers and sensor nodes.
LM4040A41IDCKR 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 88 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
LM4040A41IDCKR FAQ
1.How can I place an order for LM4040A41IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A41IDCKR 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 LM4040A41IDCKR reliable?
The price and inventory of LM4040A41IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A41IDCKR is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040A41IDCKR transactions.
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4.How is shipping managed for LM4040A41IDCKR?
LM4040A41IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040A41IDCKR 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 LM4040A41IDCKR?
For technical support, including LM4040A41IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A41IDCKR requirements.
6.How does Aetrix verify that LM4040A41IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040A41IDCKR 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 LM4040A41IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040A41IDCKR?
All LM4040A41IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A41IDCKR, 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 LM4040A41IDCKR part is unused and in its original packaging.
Return procedure for LM4040A41IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A41IDCKR Tags
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TL431AIDBZR
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AN431AN-ATRG1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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