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Texas Instruments LM4040D20IDCKR
- Part No.:
- LM4040D20IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040D20IDCKR.pdf
- Description:
- IC VREF SHUNT 1% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:760
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Product details
Overview
LM4040D20IDCKR from Texas Instruments is a precision micropower shunt voltage reference with 2.048V nominal output, ±20mV (±0.98%) initial tolerance at 25°C, 150ppm/°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 biasing.
For engineers reviewing the LM4040D20IDCKR datasheet, LM4040D20IDCKR pinout, LM4040D20IDCKR application, or LM4040D20IDCKR equivalent, key selection criteria include industrial-grade (–40°C to 85°C) operation, SC-70-5 package compatibility, cathode current dependency of output stability, and thermal hysteresis of 0.08% over –40°C to 125°C cycling.
Technical Context
The LM4040D20IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.048V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon junction delivers fixed output without external components, and it remains stable with any capacitive load - eliminating need for output capacitance.
Designed for micropower systems, it achieves 45μA minimum cathode current while maintaining 150ppm/°C max temperature coefficient and 0.3Ω typical dynamic impedance at 1mA. The D-grade variant trades tighter initial accuracy for cost-sensitive industrial applications where moderate drift is acceptable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal at IZ = 100μA; enables direct interface with 12-bit ADCs using 2.048V full-scale reference |
| Initial Tolerance | ±20mV (±0.98%) at 25°C; defines worst-case DC offset in precision sensor signal chains |
| Temp Coefficient | 150ppm/°C max over –40°C to 85°C; contributes ≤±9.75mV drift across full industrial range |
| Min Cathode Current | 45μA typical; supports ultra-low-power battery-operated field instruments |
| Dynamic Impedance | 0.3Ω to 1.1Ω (typ to max); ensures <1mV output shift under 1mA load transients |
| Wideband Noise | 35μVRMS (10Hz–10kHz); limits RMS error to ~0.0017% of output in noise-sensitive audio front-ends |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycle; adds ≤1.65mV non-repeatability in cyclic thermal environments |
Pinout & Package
LM4040D20IDCKR is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm. This space-constrained package supports high-density PCB layouts in portable instrumentation and modular I/O systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input | Primary current path; voltage regulated at cathode-to-anode; must be driven by series resistor from supply |
| Anode (Pin 1) | Common reference node | Typically connected to system ground; forms return path for cathode current |
| NC (Pins 4, 5) | No internal connection | Unused pins; must remain unconnected or tied to anode only if EMI mitigation is required per TI guidance |
| Pin 2 (*) | Internal Zener junction tap | Must float or connect to anode; ties internal structure to minimize EMI-induced voltage perturbation |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor stability | Operates reliably with any capacitive load - eliminates BOM cost and layout area for decoupling caps |
| Micropower operation | 45μA typical minimum cathode current enables >10-year battery life in wireless sensor nodes |
| Extended temp support | Specified over –40°C to 85°C ambient; validated for deployment in outdoor energy infrastructure enclosures |
| Low dynamic impedance | ≤1.1Ω ensures <1.5mV output deviation during 1mA step-load events in data-acquisition sampling circuits |
| Low thermal hysteresis | 0.08% guarantees repeatable voltage after thermal cycling - critical for calibration-critical field transmitters |
Applications
| Analog Input Module | Field Transmitter |
|---|---|
Use Scenario: High-channel-count PLC analog input card digitizing 4–20mA loop signals with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC full-scale range and sensor excitation biasing. Use Value: Enables ±0.01% measurement linearity by limiting reference drift to <±10mV over operating temperature. | Use Scenario: Loop-powered 4–20mA transmitter in oil & gas pressure sensing with HART digital overlay. IC Role / Device Role / Timing Role: Supplies precision bias for bridge sensor amplification and ADC reference in <4mA quiescent power envelope. Use Value: Maintains calibration integrity over –40°C to 70°C ambient with <±0.02% total error contribution. |
| Data-Acquisition System | Energy Infrastructure |
Use Scenario: Portable handheld multimeter with auto-ranging and true-RMS conversion. IC Role / Device Role / Timing Role: Serves as primary voltage reference for dual-slope integrator and auxiliary DACs. Use Value: Delivers 35μVRMS noise floor compatible with 5½-digit resolution without external filtering. | Use Scenario: Smart electricity meter monitoring grid voltage/current with metrology-grade accuracy. IC Role / Device Role / Timing Role: References polyphase ADCs and provides bias for isolation amplifier feedback networks. Use Value: Supports IEC 62053-21 Class 0.2 compliance via 150ppm/°C drift control over meter lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable 2.5V–36V output; 0.5% initial tolerance; 90ppm/°C tempco; SOT-23-5 package | Requires two external resistors for 2.048V setting; higher minimum cathode current (80μA) | Choose when design flexibility across multiple reference voltages is needed and board space allows resistor placement. |
| MAX6008AEUR+T | Fixed 2.048V output; 0.1% initial tolerance; 75ppm/°C tempco; SOT-23-3 package | Tighter accuracy and lower drift, but limited to 10mA max cathode current and no extended-temp grade | Choose for lab-grade instrumentation where 0.1% tolerance justifies premium cost and 85°C max ambient suffices. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040D20IDCKR offers optimal balance of industrial temperature range, micropower capability, and SC-70 footprint - making it preferred for cost-sensitive, space-constrained field devices where ±1% total error is acceptable.
Availability
LM4040D20IDCKR is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and data-acquisition systems requiring stable component supply across extended production cycles and seasonal demand spikes.
Supply support for LM4040D20IDCKR 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 series was designed specifically for precision shunt reference applications demanding low power, high stability, and minimal external components - targeting industrial sensing, metering, and portable instrumentation.
FAQ
What is the maximum cathode current rating for LM4040D20IDCKR?
The absolute maximum cathode current for LM4040D20IDCKR is 25mA, but the recommended operating range is 45μA to 15mA. Exceeding 15mA risks exceeding thermal limits in the SC-70 package, especially above 60°C ambient. Designers should calculate power dissipation (P = VZ × IZ) and verify junction temperature stays below 150°C using RθJA = 252°C/W.
Does LM4040D20IDCKR require an output capacitor for stability?
No, LM4040D20IDCKR is inherently stable with all capacitive loads and requires no output capacitor. Its internal design eliminates the need for external compensation, reducing BOM count and PCB area - a key advantage over many series references that mandate specific capacitor values and ESR ranges.
How does the D-grade tolerance of LM4040D20IDCKR compare to A- or B-grade variants?
LM4040D20IDCKR has ±20mV (±0.98%) initial tolerance at 25°C and 150ppm/°C temperature coefficient, versus ±2mV (±0.1%) and 100ppm/°C for A-grade. This makes the D-grade suitable for cost-sensitive industrial applications where ±1% total error is acceptable, while A/B grades target metrology or calibration equipment.
Can LM4040D20IDCKR be used in automotive applications?
LM4040D20IDCKR is rated for –40°C to 85°C operation and is not AEC-Q200 qualified. For automotive cabin or engine bay use, TI recommends LM4040D20Q (–40°C to 125°C, same D-grade specs) or automotive-qualified alternatives like REF3020AIDBZR. Always verify qualification status and thermal derating for under-hood deployments.
What is the purpose of Pin 2 (*) on the LM4040D20IDCKR SC-70 package?
Pin 2 (*) on LM4040D20IDCKR is an internal Zener junction tap. TI specifies it must either float or connect directly to the anode (Pin 1) - never left open in high-EMI environments. This connection reduces sensitivity to electromagnetic interference near transformers or switching regulators, preventing spurious voltage shifts up to 5mV.
LM4040D20IDCKR 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°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
LM4040D20IDCKR FAQ
1.How can I place an order for LM4040D20IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D20IDCKR 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 LM4040D20IDCKR reliable?
The price and inventory of LM4040D20IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D20IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040D20IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D20IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040D20IDCKR?
LM4040D20IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D20IDCKR 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 LM4040D20IDCKR?
For technical support, including LM4040D20IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D20IDCKR requirements.
6.How does Aetrix verify that LM4040D20IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040D20IDCKR 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 LM4040D20IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040D20IDCKR?
All LM4040D20IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D20IDCKR, 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 LM4040D20IDCKR part is unused and in its original packaging.
Return procedure for LM4040D20IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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