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Texas Instruments LM4040C30ILPR
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- Part No.:
- LM4040C30ILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM4040C30ILPR.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,888
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Product details
Overview
LM4040C30ILPR from Texas Instruments is a precision micropower shunt voltage reference with a fixed 3.0V output, ±0.5% initial accuracy (C grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-drift voltage reference in analog signal chains for industrial sensors and data-acquisition front-ends.
For engineers reviewing the LM4040C30ILPR datasheet, LM4040C30ILPR pinout, LM4040C30ILPR application, or LM4040C30ILPR equivalent, key selection criteria include its 3.0V nominal output, C-grade tolerance over –40°C to +85°C, SC-70-5 package footprint, no-output-capacitor requirement, and compatibility with high-impedance sensing nodes.
Technical Context
The LM4040C30ILPR operates as a two-terminal shunt reference, sinking cathode current (IZ) to regulate voltage across its terminals. Its Zener-based architecture uses wafer-level fuse/Zener-zap trimming to achieve ±0.5% initial accuracy at 25°C and maintains stability across capacitive loads without external compensation.
It delivers 3.0V reverse breakdown voltage with 0.4–0.9Ω dynamic impedance (IZ = 1mA), supports operation from 45μA minimum cathode current, and exhibits thermal hysteresis of 0.08% over –40°C to +125°C cycling - validated for industrial ambient range (–40°C to +85°C) per the "I" suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal at IZ = 100μA; enables direct interface with 3V ADC references and microcontroller VREF inputs |
| Initial Accuracy | ±0.5% at 25°C (C grade); ensures ≤±15mV absolute error before temperature drift |
| Temp Coefficient | 100ppm/°C max; contributes ≤±6.5mV drift over –40°C to +85°C operating range |
| Dynamic Impedance | 0.4Ω typical at IZ = 1mA; minimizes load-induced voltage shift in varying-current applications |
| Wideband Noise | 35μVRMS (10Hz–10kHz); preserves SNR in precision 16-bit+ data acquisition systems |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-backed sensor nodes |
| Operating Range | –40°C to +85°C ambient; qualified for industrial control and field instrumentation |
Pinout & Package
LM4040C30ILPR is packaged in a 5-pin SC-70 (DCK) package measuring 2.00mm × 1.25mm. The device has three functional terminals (Cathode, Anode, and NC) with two no-connect pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input / voltage regulation node | Connected to supply rail; sinks current to maintain 3.0V across Anode–Cathode |
| Anode (Pin 1) | Reference ground / common return | Typically tied to system ground; forms reference potential for output voltage |
| NC (Pins 4, 5) | No internal connection | Must remain unconnected; floating or grounded per layout best practices for EMI immunity |
| Pin 2 (*) | Internal Zener substrate tap | Must float or connect to Anode; improves EMI rejection near switching noise sources |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and PCB area in space-constrained modules |
| Low 35μVRMS noise | Enables high-resolution measurements without post-regulation filtering in 16-bit+ SAR ADC designs |
| 45μA min cathode current | Supports operation in ultra-low-power wake-up circuits and energy-harvesting sensor nodes |
| 100ppm/°C tempco | Ensures <±10mV total drift over full industrial temperature range - critical for uncalibrated field transmitters |
| SC-70-5 package | Provides 40% smaller footprint than SOT-23-3 while maintaining thermal performance via exposed pad variants |
Applications
| Industrial Sensor Front-End | Portable Data Logger |
|---|---|
Use Scenario: High-accuracy temperature and pressure transducers feeding 16-bit sigma-delta ADCs in factory-floor monitoring units. IC Role / Device Role / Timing Role: Provides stable 3.0V reference for ADC conversion and sensor excitation bias. Use Value: ±0.5% initial accuracy and 100ppm/°C drift ensure <0.1% total measurement error without calibration across –20°C to +70°C ambient. | Use Scenario: Battery-powered environmental logger sampling thermistors and humidity sensors every 5 minutes. IC Role / Device Role / Timing Role: Low-quiescent shunt reference enabling microamp-level system sleep current. Use Value: 45μA minimum cathode current allows reference operation during deep-sleep mode, extending 2xAA battery life beyond 2 years. |
| Programmable Logic Controller (PLC) Analog Input Module | Automotive Cabin Air Quality Sensor |
Use Scenario: 4–20mA loop-powered analog input card conditioning signals from remote field devices. IC Role / Device Role / Timing Role: Precision 3.0V reference for current-to-voltage conversion and ADC reference in isolated input stages. Use Value: Stable regulation under variable loop current (4–20mA) and wide temperature range ensures consistent 12-bit linearity across operating conditions. | Use Scenario: Compact air quality module detecting CO₂ and VOCs inside vehicle cabins with minimal heat generation. IC Role / Device Role / Timing Role: Low-noise 3.0V reference for electrochemical sensor signal conditioning and microcontroller ADC. Use Value: 35μVRMS noise prevents degradation of weak sensor signals; SC-70 package fits tight head-unit PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C30IDBVR | SOT-23-3 package (2.92mm × 1.30mm); same electrical specs, higher RθJA (206°C/W vs 252°C/W) | Better thermal performance in high-density layouts; requires different land pattern and reflow profile | Select when board space permits larger footprint and thermal dissipation is prioritized over miniaturization |
| MAX6003EUR+T | 3.0V output, ±0.5% accuracy, but higher 60μVRMS noise and 65ppm/°C tempco; SC-70-5 package | Lower noise sensitivity required; less demanding drift budgets in consumer-grade applications | Choose when cost sensitivity outweighs ultra-low-noise requirements and long-term stability is secondary |
Compared with LM4040C30ILPR, LM4040C30IDBVR offers identical electrical performance in a thermally superior SOT-23 package, while MAX6003EUR+T trades 25μVRMS more noise and looser drift for potential cost savings - making LM4040C30ILPR optimal for industrial-grade precision where noise and thermal stability are non-negotiable.
Availability
LM4040C30ILPR is available at Aetrix Electronics and suitable for industrial sensor front-ends, portable data loggers, and PLC analog input modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM4040C30ILPR 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 industrial-grade reliability.
The LM4040 series was developed to deliver cost-effective, space-efficient shunt references for high-accuracy data acquisition, sensor signal conditioning, and power-supply monitoring in harsh industrial environments.
FAQ
What is the maximum cathode current rating for LM4040C30ILPR?
The absolute maximum cathode current for LM4040C30ILPR is 25mA per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA - exceeding 15mA risks thermal overload in the SC-70-5 package without forced airflow or heatsinking, and may degrade long-term stability beyond the 120ppm specification.
Does LM4040C30ILPR require an output capacitor for stability?
No, LM4040C30ILPR is inherently stable with all capacitive loads and does not require an output capacitor. This is confirmed in TI's datasheet Section 1 and Section 3, which explicitly state "no output capacitor required" due to its robust Zener-based architecture and low dynamic impedance - simplifying layout and reducing component count in space-constrained designs.
What is the thermal hysteresis specification for LM4040C30ILPR?
LM4040C30ILPR exhibits 0.08% thermal hysteresis, defined as the voltage difference measured at 25°C after cycling from –40°C versus after cycling from +125°C. This value is consistent across all LM4040 grades and packages, and directly impacts repeatability in systems undergoing repeated thermal cycles - such as outdoor field transmitters or automotive cabin sensors.
Can LM4040C30ILPR be used in automotive applications?
LM4040C30ILPR is rated for –40°C to +85°C operation (industrial grade, "I" suffix) and is not AEC-Q200 qualified. While it functions reliably in cabin-temperature automotive subsystems like air quality sensors, TI recommends the LM4040C30Q variant (–40°C to +125°C, "Q" suffix) for under-hood or safety-critical applications requiring extended temperature qualification and automotive-grade screening.
How does the pin 2 (*) function on LM4040C30ILPR in the SC-70-5 package?
Pin 2 on LM4040C30ILPR is an internal Zener substrate tap, labeled "*" in TI's Pin Configuration diagram. It must either float or be connected to the Anode (Pin 1) - especially in high-EMI environments (e.g., near transformers or DC-DC converters) - to suppress noise coupling into the reference junction and maintain specified 35μVRMS noise performance.
LM4040C30ILPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3V
- 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:
- 82 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040C30ILPR FAQ
1.How can I place an order for LM4040C30ILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C30ILPR 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 LM4040C30ILPR reliable?
The price and inventory of LM4040C30ILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C30ILPR is usually 5 days.
3.What payment methods are accepted for LM4040C30ILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C30ILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C30ILPR?
LM4040C30ILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C30ILPR 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 LM4040C30ILPR?
For technical support, including LM4040C30ILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C30ILPR requirements.
6.How does Aetrix verify that LM4040C30ILPR is sourced from the original manufacturer or authorized distributors?
All LM4040C30ILPR 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 LM4040C30ILPR meets industry standards.
7.What is the process for return or replacement of LM4040C30ILPR?
All LM4040C30ILPR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C30ILPR, 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 LM4040C30ILPR part is unused and in its original packaging.
Return procedure for LM4040C30ILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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