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Texas Instruments LM4040A20IDCKR
- Part No.:
- LM4040A20IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040A20IDCKR.pdf
- Description:
- IC VREF SHUNT 0.1% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,571
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Product details
Overview
LM4040A20IDCKR from Texas Instruments is a precision micropower shunt voltage reference with 2.048V 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 portable sensor signal conditioning circuits.
For engineers reviewing the LM4040A20IDCKR datasheet, LM4040A20IDCKR pinout, LM4040A20IDCKR application, or LM4040A20IDCKR equivalent, key selection criteria include guaranteed 2.048V output tolerance at 25°C, thermal hysteresis of 0.08%, long-term stability of 120ppm over 1000 hours, and compatibility with all capacitive loads without external compensation.
Technical Context
The LM4040A20IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon junction delivers fixed 2.048V output with no external components required.
It features low dynamic impedance (0.3–0.8Ω at 1mA), minimal voltage drift versus cathode current (≤8mV over 1mA–15mA), and guaranteed performance across –40°C to 85°C ambient temperature - validated for industrial-grade applications requiring stable bias under varying load and thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; enables exact binary-scaled 12-bit ADC full-scale reference (211 × 1mV) |
| Initial Accuracy | ±0.1% at 25°C; ensures ≤±2.05mV absolute error in precision measurement front-ends |
| Tempco | 100ppm/°C max; contributes ≤±6.5mV drift over –40°C to 85°C operating range |
| Noise (10Hz–10kHz) | 35μVRMS typical; supports <16-bit ENOB in low-noise data acquisition systems |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered IoT sensors |
| Dynamic Impedance | 0.3–0.8Ω at 1mA; maintains output regulation despite fast load transients |
| Thermal Hysteresis | 0.08%; limits repeatability error after thermal cycling in field-deployed instrumentation |
Pinout & Package
LM4040A20IDCKR is packaged in a 5-pin SC-70 (DCK) package measuring 2.00mm × 1.25mm. The device uses a three-terminal configuration with two NC pins, optimized for space-constrained PCB layouts while maintaining robust ESD performance (±2000V HBM).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input | Primary current path; connects to regulated supply rail via series resistor |
| Anode (Pin 1) | Common reference node | Typically grounded; establishes 0V reference for output voltage measurement |
| NC (Pins 4, 5) | No internal connection | Must be left unconnected or tied to anode per EMI mitigation guidance |
| Pin 2 (*) | Internal Zener junction tap | Must float or connect to anode; improves noise immunity near switching noise sources |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load up to 10μF; eliminates BOM cost and layout area for decoupling caps |
| Wide cathode current range | 45μA to 15mA operation enables use in both nanoamp sensor bias and 12-bit DAC reference applications |
| Low long-term drift | 120ppm shift after 1000 hours ensures calibration stability in unattended monitoring systems |
| Extended temperature validation | Characterized from –40°C to 85°C; supports deployment in automotive cabin and industrial control environments |
| High ESD robustness | ±2000V HBM rating reduces risk of handling damage during manual assembly and test |
Applications
| Portable Sensor Signal Conditioning | High-Resolution ADC Reference |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature and humidity with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC VREF input, enabling full-scale resolution matching sensor output range. Use Value: 0.1% initial accuracy and 100ppm/°C tempco ensure ≤0.25% total error over operating temperature, meeting Class A sensor accuracy requirements. | Use Scenario: Precision weigh scale using 24-bit delta-sigma ADC for load cell interface. IC Role / Device Role / Timing Role: Supplies low-noise 2.048V reference to ADC's reference input, directly setting LSB weight (0.125μV). Use Value: 35μVRMS noise floor prevents degradation of effective resolution below 20 bits, preserving system dynamic range. |
| Industrial Analog Input Module | Field Transmitter Calibration |
Use Scenario: 4–20mA loop-powered analog input module accepting 0–10V sensor signals. IC Role / Device Role / Timing Role: References the input signal scaling amplifier and ADC, ensuring traceable voltage measurement against factory calibration. Use Value: 0.08% thermal hysteresis and 120ppm long-term stability minimize recalibration frequency in deployed modules. | Use Scenario: Smart pressure transmitter performing on-site zero/span adjustment using microcontroller-based calibration routines. IC Role / Device Role / Timing Role: Supplies stable 2.048V reference to internal DAC used for generating precise calibration voltages. Use Value: Tight ±0.1% tolerance guarantees calibration voltage accuracy within ±2mV, satisfying IEC 61298-2 Class 0.1 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6002AEUR+T | 2.048V output, ±0.1% accuracy, but higher 50μVRMS noise and 125ppm/°C tempco | Suitable for lower-resolution systems where noise margin exceeds 50μVRMS | Select when footprint compatibility with SOT-23-3 is required and noise sensitivity is relaxed |
| ADR3420ARJZ-R7 | 2.048V output, ±0.1% accuracy, 12ppm/°C tempco, but requires minimum 100μA supply current | Better drift performance for extended temperature ranges; higher quiescent current limits ultra-low-power use | Prefer for high-stability metrology applications where power budget allows ≥100μA |
Compared with MAX6002AEUR+T, LM4040A20IDCKR offers 30% lower noise and tighter thermal drift; compared with ADR3420ARJZ-R7, it achieves 45μA minimum operating current - critical for energy-harvesting sensor nodes - at the expense of slightly higher tempco.
Availability
LM4040A20IDCKR is available at Aetrix Electronics and suitable for portable sensor signal conditioning, high-resolution ADC reference, and industrial analog input modules requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040A20IDCKR 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 family was engineered for cost-sensitive, space-constrained applications demanding high initial accuracy and low drift - particularly in portable instrumentation, industrial process control, and automotive subsystems.
FAQ
What is the maximum cathode current rating for LM4040A20IDCKR?
The absolute maximum cathode current for LM4040A20IDCKR is 25mA, but the recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability; operation above 25mA risks permanent damage per TI's Absolute Maximum Ratings table.
Does LM4040A20IDCKR require an output capacitor for stability?
No, LM4040A20IDCKR is inherently stable with all capacitive loads and does not require an output capacitor. This is confirmed in TI's datasheet Section 1 (Features) and Section 3 (Description), which explicitly state "stable with all capacitive loads; no output capacitor required" - simplifying layout and reducing BOM count.
What is the thermal hysteresis specification for LM4040A20IDCKR?
The thermal hysteresis for LM4040A20IDCKR 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 is specified in Sections 6.5–6.7 of the TI datasheet.
Can LM4040A20IDCKR be used in automotive applications?
LM4040A20IDCKR is qualified for the industrial temperature range (–40°C to +85°C), making it suitable for under-hood automotive cabin modules and non-safety-critical infotainment subsystems. It is not AEC-Q100 qualified; for engine bay or ADAS applications, TI's LM4040Q series (e.g., LM4040C20Q) is recommended.
How does the 2.048V output voltage benefit data acquisition systems?
The 2.048V output of LM4040A20IDCKR aligns precisely with binary scaling for 12-bit ADCs (211 = 2048), enabling 1mV/LSB resolution without gain calibration. This simplifies firmware design, improves measurement repeatability, and eliminates scaling errors in systems like digital multimeters and programmable logic controllers.
LM4040A20IDCKR 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
LM4040A20IDCKR FAQ
1.How can I place an order for LM4040A20IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A20IDCKR 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 LM4040A20IDCKR reliable?
The price and inventory of LM4040A20IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A20IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040A20IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040A20IDCKR transactions.
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4.How is shipping managed for LM4040A20IDCKR?
LM4040A20IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040A20IDCKR 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 LM4040A20IDCKR?
For technical support, including LM4040A20IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A20IDCKR requirements.
6.How does Aetrix verify that LM4040A20IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040A20IDCKR 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 LM4040A20IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040A20IDCKR?
All LM4040A20IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A20IDCKR, 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 LM4040A20IDCKR part is unused and in its original packaging.
Return procedure for LM4040A20IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A20IDCKR Tags
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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
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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