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Texas Instruments LM4040C20IDCKR
- Part No.:
- LM4040C20IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040C20IDCKR.pdf
- Description:
- IC VREF SHUNT 0.5% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,547
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Product details
Overview
LM4040C20IDCKR from Texas Instruments is a precision 2.048V shunt voltage reference in SC-70-5 package, rated for –40°C to 85°C operation, with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS noise, and stable performance down to 45μA cathode current. It serves as a compact, low-power reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040C20IDCKR datasheet, LM4040C20IDCKR pinout, LM4040C20IDCKR application, or LM4040C20IDCKR equivalent, key selection criteria include output tolerance over temperature, minimum operating current, dynamic impedance, noise performance, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040C20IDCKR 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-based architecture uses wafer-level fuse and Zener-zap trimming to achieve C-grade (±0.5%) initial accuracy.
It delivers stable regulation across 45μA–15mA cathode current and –40°C to 85°C ambient, with low 0.9Ω typical dynamic impedance at 1mA and thermal hysteresis of 0.08% - critical for repeatable precision in cycling environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; exact value enables direct interface with 12-bit ADCs using VREF = VDD/2 or binary-scaled references. |
| Initial Accuracy | ±0.5% at 25°C; corresponds to ±10.24mV tolerance - sufficient for 10-bit system-level accuracy without calibration. |
| Tempco | 100ppm/°C max; contributes ≤±6.5mV drift over –40°C to 85°C, supporting industrial-grade measurement stability. |
| Noise (10Hz–10kHz) | 35μVRMS typical; low enough to avoid degrading ENOB in 16-bit SAR ADCs with >90dB SNR requirements. |
| Min Cathode Current | 45μA typical; allows operation from high-impedance bias networks or micropower supervisory circuits. |
| Dynamic Impedance | 0.9Ω typical at 1mA; ensures <1mV load regulation error for ±1mA current transients in precision DAC buffers. |
| Operating Temp Range | –40°C to +85°C; qualified for industrial ambient conditions without derating or thermal management. |
Pinout & Package
LM4040C20IDCKR is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm, optimized for space-constrained PCB layouts. The package includes two no-connect (NC) pins to support variant pinouts within the family while maintaining mechanical compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input / voltage sense node | Connected to supply rail; sinks current to regulate voltage at anode node - must be routed with low-inductance path for noise immunity. |
| Anode (Pin 1) | Reference output / ground reference | Provides stable 2.048V relative to system ground; ties directly to ADC VREF or op-amp reference input. |
| NC (Pins 4, 5) | No internal connection | Unused; may be left floating or tied to ground for mechanical stability - no electrical function or signal integrity impact. |
| Pin 2* | Internal Zener anode tie (optional) | Must float or connect to anode; recommended for EMI-prone layouts near switching regulators or transformers to suppress noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies layout and avoids phase-margin risks in battery-powered sensors. |
| Low 35μVRMS wideband noise | Preserves signal integrity in high-resolution data acquisition; avoids post-processing filtering in portable instrumentation. |
| 45μA minimum operating current | Enables use in always-on monitoring nodes powered by energy-harvesting sources or coin-cell batteries. |
| 100ppm/°C tempco (C grade) | Meets industrial-grade drift budgets without software compensation - reduces firmware complexity in field transmitters. |
| SC-70-5 package | 0.65mm pitch, 2.0mm × 1.25mm footprint - supports high-density routing in modular PLC I/O modules. |
Applications
| Data-Acquisition Systems | Field Transmitters |
|---|---|
Use Scenario: High-accuracy 16-bit SAR ADC front-end in portable multimeters and power analyzers. IC Role / Device Role / Timing Role: Provides stable 2.048V reference voltage for ADC full-scale range definition and ratiometric sensor excitation. Use Value: Enables ±0.5 LSB integral nonlinearity performance over temperature without recalibration. | Use Scenario: 4–20mA loop-powered pressure and temperature transmitters deployed in oil & gas facilities. IC Role / Device Role / Timing Role: Serves as primary voltage reference for signal conditioning and DAC output scaling in isolated analog output stages. Use Value: Maintains <±0.1% span error over –40°C to 85°C ambient, meeting SIL-2 functional safety margin requirements. |
| Analog Input Module | Energy Infrastructure |
Use Scenario: Modular PLC analog input card accepting ±10V, 0–20mA, and thermocouple inputs. IC Role / Device Role / Timing Role: Supplies calibrated reference for programmable gain instrumentation amplifiers and multiplexed ADC channels. Use Value: Guarantees channel-to-channel matching <±0.05% due to low thermal hysteresis (0.08%) and tight initial tolerance. | Use Scenario: Smart meter metrology IC reference in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: References metrology ADC and anti-aliasing filter cutoff in Class 0.2 accuracy designs. Use Value: Contributes <±30ppm total error over 10-year lifetime (120ppm long-term stability), satisfying ANSI accuracy retention specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C20IDBZR | Same 2.048V output, ±0.5% accuracy, but SOT-23-3 package (3-pin); higher 1.5Ω dynamic impedance. | Requires PCB redesign for 3-pin vs. 5-pin layout; less suitable for ultra-low-noise 16-bit DAQ where 0.9Ω ZZ matters. | Select when board space permits SOT-23 and dynamic impedance >1Ω is acceptable. |
| MAX6008AEUR+T | 2.048V, ±0.2% initial accuracy (A grade), SC-70-5 package, but 50μVRMS noise and 65ppm/°C tempco. | Better accuracy but higher noise limits use in low-SNR sensor interfaces; tighter tempco eases thermal design. | Select when initial accuracy dominates system error budget and noise <35μVRMS is not required. |
Compared with TL4050C20IDBZR and MAX6008AEUR+T, LM4040C20IDCKR offers the optimal balance of SC-70-5 footprint, 0.9Ω dynamic impedance, and 35μVRMS noise - making it preferred for space-constrained, low-drift, high-SNR industrial DAQ systems.
Availability
LM4040C20IDCKR is available at Aetrix Electronics and suitable for data-acquisition systems, field transmitters, and analog input modules requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LM4040C20IDCKR 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 micropower operation, low noise, and robust capacitive-load stability - targeting industrial sensing, metering, and portable instrumentation.
FAQ
What is the maximum cathode current rating for LM4040C20IDCKR?
The absolute maximum cathode current for LM4040C20IDCKR is 25mA per the datasheet's Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA - exceeding 15mA risks thermal overload and long-term reliability degradation, especially in the SC-70 package with its 252°C/W junction-to-ambient thermal resistance.
Does LM4040C20IDCKR require an output capacitor for stability?
No, LM4040C20IDCKR is explicitly designed to be stable with all capacitive loads and requires no output capacitor. This is confirmed in both the Features list ("Stable with all capacitive loads; no output capacitor required") and the Description section, making it ideal for space-sensitive and low-component-count designs like handheld test equipment.
What is the thermal hysteresis specification for LM4040C20IDCKR?
LM4040C20IDCKR 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 low hysteresis ensures repeatable reference voltage behavior in systems experiencing repeated thermal cycles, such as outdoor environmental monitors or intermittently powered industrial gateways.
Can LM4040C20IDCKR operate from a 3.3V supply?
Yes, LM4040C20IDCKR can operate from a 3.3V supply. With a 2.048V breakdown voltage and minimum cathode current of 45μA, the series resistor required is (3.3V – 2.048V) / 45μA ≈ 27.8kΩ - well within standard resistor values and compatible with low-power microcontroller GPIO drive capability in supervisory applications.
How does the 100ppm/°C temperature coefficient affect LM4040C20IDCKR in a –40°C to 85°C environment?
Over –40°C to 85°C (ΔT = 125°C), the 100ppm/°C tempco contributes up to ±12.5mV (±0.61%) drift to the 2.048V output. Combined with the ±0.5% initial tolerance, total worst-case error is ±1.11% - still within spec for 10-bit systems and manageable via one-point calibration in 12-bit applications using LM4040C20IDCKR.
LM4040C20IDCKR 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:
- ±0.5%
- 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
LM4040C20IDCKR FAQ
1.How can I place an order for LM4040C20IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C20IDCKR 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 LM4040C20IDCKR reliable?
The price and inventory of LM4040C20IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C20IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040C20IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C20IDCKR transactions.
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4.How is shipping managed for LM4040C20IDCKR?
LM4040C20IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C20IDCKR 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 LM4040C20IDCKR?
For technical support, including LM4040C20IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C20IDCKR requirements.
6.How does Aetrix verify that LM4040C20IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040C20IDCKR 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 LM4040C20IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040C20IDCKR?
All LM4040C20IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C20IDCKR, 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 LM4040C20IDCKR part is unused and in its original packaging.
Return procedure for LM4040C20IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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