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Texas Instruments LM4040C41IDCKR
- Part No.:
- LM4040C41IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040C41IDCKR.pdf
- Description:
- IC VREF SHUNT 0.5% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,650
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Product details
Overview
LM4040C41IDCKR from Texas Instruments is a precision micropower shunt voltage reference with 4.096 V nominal output, ±0.5% initial accuracy (C grade), 100 ppm/°C temperature coefficient, 35 μVRMS wideband noise, and stable operation from 45 μA to 15 mA cathode current. It serves as a compact, low-noise voltage reference in analog-to-digital converter biasing, sensor excitation, and portable instrumentation circuits.
For engineers reviewing the LM4040C41IDCKR datasheet, LM4040C41IDCKR pinout, LM4040C41IDCKR application, or LM4040C41IDCKR equivalent, key selection criteria include output tolerance over –40°C to 85°C, dynamic impedance below 0.9 Ω at 1 mA, no-output-capacitor stability, and SC-70 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4040C41IDCKR operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 4.096 V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design delivers fixed output without external components, and it achieves thermal hysteresis of only 0.08% after cycling between –40°C and 125°C.
It exhibits low dynamic impedance (0.3–0.9 Ω) and maintains output stability across capacitive loads up to 10 nF, eliminating need for output bypass capacitors. The device is characterized for industrial temperature range (–40°C to +85°C) and supports long-term stability of 120 ppm over 1000 hours at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; enables exact 12-bit full-scale alignment in 5-V ADC systems |
| Initial Accuracy | ±0.5% at 25°C; corresponds to ±20.5 mV tolerance for high-precision calibration |
| Temp Coefficient | 100 ppm/°C max; contributes ≤ ±6.5 mV drift over –40°C to +85°C operating range |
| Noise (10 Hz–10 kHz) | 35 μVRMS; minimizes quantization error in 16-bit+ data acquisition |
| Min Cathode Current | 45 μA typical; supports ultra-low-power sensor interfaces and battery-operated devices |
| Dynamic Impedance | 0.9 Ω max at 1 mA; ensures <1 mV load regulation error under 1-mA step changes |
| Long-Term Stability | 120 ppm over 1000 h; reduces recalibration frequency in field-deployed equipment |
Pinout & Package
LM4040C41IDCKR is packaged in a 5-pin SC-70 (DCK) surface-mount package measuring 2.00 mm × 1.25 mm. Pin 1 is Anode (ground reference), Pin 3 is Cathode (voltage output), Pins 4 and 5 are No Connect (NC), and Pin 2 is the floating or anode-tied terminal used for EMI mitigation in noisy environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Common ground node; must be connected to system GND for proper shunt operation |
| Pin 2 | NC (EMI Tie) | Optional connection to anode to suppress high-frequency noise coupling in EMI-prone layouts |
| Pin 3 | Cathode | Current-sinking output terminal; develops 4.096 V relative to anode when biased above threshold |
| Pins 4 & 5 | No Connect | Internally unconnected; must remain floating or grounded per layout best practices |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with all capacitive loads up to 10 nF; eliminates BOM cost and board area for external capacitor |
| Wide cathode current range | 45 μA to 15 mA operation enables use in both nanoamp sensor biasing and 10-mA DAC reference applications |
| Low thermal hysteresis | 0.08% voltage shift after –40°C ↔ 125°C thermal cycling ensures repeatable calibration across environmental cycles |
| EMI-resistant pin option | Pin 2 provides dedicated EMI suppression path-connect to anode near noise sources to reduce RF rectification |
| Space-saving SC-70 package | 2.00 mm × 1.25 mm footprint supports high-density routing in portable medical and IoT edge nodes |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure with 16-bit ADCs. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for ADC full-scale calibration and sensor bridge excitation. Use Value: Enables 12-bit effective resolution without recalibration over 5-year field life due to 120 ppm long-term stability and 100 ppm/°C tempco. | Use Scenario: 4–20 mA loop-powered transmitters converting RTD or strain-gauge signals in process control cabinets. IC Role / Device Role / Timing Role: Supplies precision excitation voltage to ratiometric sensors and reference for current-loop DAC. Use Value: Maintains ±0.1% total error budget across –40°C to +85°C ambient via tight initial tolerance and low dynamic impedance. |
| Medical Patient Monitoring | Energy Metering Front-Ends |
Use Scenario: Wearable ECG/SpO₂ modules requiring low-noise, low-power analog signal conditioning. IC Role / Device Role / Timing Role: Low-noise (35 μVRMS) voltage reference for op-amp gain stages and ADC reference input. Use Value: Reduces baseline noise floor by >2× versus standard bandgap references, improving SNR in sub-μV biopotential measurements. | Use Scenario: Polyphase electricity meters using metrology-grade ADCs for revenue-grade kWh measurement. IC Role / Device Role / Timing Role: High-stability reference for anti-aliasing filter biasing and ADC reference rail in Class 0.2 metering ICs. Use Value: Meets IEC 62053-21 linearity and temperature drift requirements with ±0.5% initial accuracy and <1 mV load regulation error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C41IDBZR | Same 4.096 V output, ±0.5% accuracy, but uses SOT-23-3 (DBZ) package; higher dynamic impedance (1.2 Ω max) | Larger footprint (2.92 mm × 1.30 mm); less suitable for ultra-dense layouts than SC-70 | Choose when legacy SOT-23 assembly lines or higher current capability (20 mA max) are prioritized |
| REF3040AIDBZR | Series reference (not shunt); 4.096 V, ±0.2% accuracy; requires input voltage ≥ 4.3 V and output capacitor | Higher quiescent current (40 μA vs. 45 μA typ); incompatible with shunt topology constraints | Choose only if supply headroom allows series architecture and tighter initial accuracy justifies added complexity |
Compared with TL4050C41IDBZR and REF3040AIDBZR, LM4040C41IDCKR offers the smallest PCB footprint, zero-output-capacitor operation, and optimal trade-off between accuracy, noise, and micropower performance for shunt-based designs.
Availability
LM4040C41IDCKR is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical patient monitoring systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4040C41IDCKR 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 technologies, 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 data acquisition, sensor signal chains, and portable instrumentation where size, stability, and simplicity are critical.
FAQ
What is the maximum operating temperature range for LM4040C41IDCKR?
The LM4040C41IDCKR is characterized for operation from –40°C to +85°C (industrial temperature range). It is not rated for extended temperature operation up to 125°C-that specification applies only to Q-grade variants such as LM4040C41Q.
Does LM4040C41IDCKR require an output capacitor for stability?
No, LM4040C41IDCKR is stable with all capacitive loads and does not require an output capacitor. This is confirmed in the datasheet Feature list and Section 3 Description, enabling simplified layout and reduced BOM count.
What is the cathode current range for proper regulation of LM4040C41IDCKR?
LM4040C41IDCKR regulates correctly with cathode current from 45 μA (typical minimum) up to 15 mA. Operation below 45 μA may result in insufficient Zener conduction and loss of specified accuracy.
How does the Pin 2 terminal function on LM4040C41IDCKR?
Pin 2 on LM4040C41IDCKR is a dedicated EMI mitigation terminal. It must either float or be connected directly to the anode (Pin 1) to reduce high-frequency noise coupling-especially critical near transformers or switching regulators.
Is LM4040C41IDCKR compatible with reflow soldering processes?
Yes, LM4040C41IDCKR in the SC-70 (DCK) package is qualified for standard Pb-free reflow soldering per JEDEC J-STD-020, with peak reflow temperature up to 260°C and moisture sensitivity level (MSL) 1.
LM4040C41IDCKR 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:
- ±0.5%
- 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
LM4040C41IDCKR FAQ
1.How can I place an order for LM4040C41IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C41IDCKR 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 LM4040C41IDCKR reliable?
The price and inventory of LM4040C41IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C41IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040C41IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C41IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C41IDCKR?
LM4040C41IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C41IDCKR 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 LM4040C41IDCKR?
For technical support, including LM4040C41IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C41IDCKR requirements.
6.How does Aetrix verify that LM4040C41IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040C41IDCKR 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 LM4040C41IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040C41IDCKR?
All LM4040C41IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C41IDCKR, 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 LM4040C41IDCKR part is unused and in its original packaging.
Return procedure for LM4040C41IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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