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Texas Instruments LM4040D41ILPR
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- Part No.:
- LM4040D41ILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM4040D41ILPR.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,970
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Product details
Overview
LM4040D41ILPR from Texas Instruments is a precision micropower shunt voltage reference with 4.096V nominal output, ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, capacitor-free reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040D41ILPR datasheet, LM4040D41ILPR pinout, LM4040D41ILPR application, or LM4040D41ILPR equivalent, key selection criteria include its industrial-temperature-rated SOT-23-3 package, low minimum operating current, tight tolerance over –40°C to +85°C, and compatibility with all capacitive loads without external compensation.
Technical Context
The LM4040D41ILPR operates as a two-terminal shunt reference, sinking cathode current to maintain a stable 4.096V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves D-grade accuracy and supports operation from 45μA minimum current up to 15mA maximum cathode current.
It features low dynamic impedance (≤1.1Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm after 1000 hours. The device is characterized for –40°C to +85°C ambient operation and requires no output capacitor, simplifying layout in space-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; enables precise 12-bit ADC full-scale alignment without scaling resistors |
| Initial Accuracy | ±1.0% max at 25°C; defines worst-case offset in calibration-critical measurement front-ends |
| Tempco | 150ppm/°C max; contributes ≤±0.12% error over –40°C to +85°C operating range |
| Noise (10Hz–10kHz) | 35μVRMS typical; minimizes quantization uncertainty in high-resolution data acquisition |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered sensor nodes |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures stable regulation under fast load transients in precision analog circuits |
| Operating Temp Range | –40°C to +85°C; qualified for industrial control and automotive cabin electronics |
Pinout & Package
LM4040D41ILPR is packaged in a 3-pin SOT-23 (DBZ) surface-mount package measuring 2.92mm × 1.30mm. Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is the NC (No Connect) terminal - which must float or be tied to Anode per TI recommendation in EMI-sensitive layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage reference node | Connects to regulated supply rail; sinks current to maintain 4.096V across Anode–Cathode |
| Anode (Pin 2) | Common reference return / ground reference | Typically connected to system ground; forms reference potential for feedback networks |
| NC (Pin 3) | No internal connection | Must remain unconnected or tied to Anode to reduce EMI susceptibility in noisy environments |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates reliably with any capacitive load - eliminates need for output bypass capacitor and associated board area |
| Micropower operation | 45μA typical minimum cathode current enables >10-year battery life in always-on IoT sensors |
| Low noise performance | 35μVRMS wideband noise preserves SNR in 16-bit+ data converters and precision instrumentation |
| Wide current range | Supports 45μA to 15mA cathode current - accommodates both ultra-low-power and higher-drive applications |
| Thermal hysteresis | 0.08% max ensures repeatable voltage after thermal cycling - critical for field-deployed calibration equipment |
Applications
| Industrial Data-Acquisition Systems | Energy Infrastructure Monitoring |
|---|---|
Use Scenario: High-accuracy voltage reference for 16-bit SAR ADCs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Shunt reference providing stable 4.096V reference rail for ADC conversion accuracy and channel-to-channel matching. Use Value: Enables ±0.5 LSB integral nonlinearity over temperature without recalibration, reducing field service costs. | Use Scenario: Reference source for current-sense amplifiers and isolation ADCs in solar inverter DC-link monitoring. IC Role / Device Role / Timing Role: Precision shunt reference establishing accurate scaling for bidirectional DC current measurement. Use Value: Maintains <±0.2% gain error over –25°C to +70°C ambient, supporting IEC 62109 compliance testing. |
| Analog Input Modules | Field Transmitters |
Use Scenario: Reference element in 4–20mA loop-powered transmitter signal conditioning circuitry. IC Role / Device Role / Timing Role: Low-current shunt reference supplying excitation and scaling for RTD/thermocouple front-ends. Use Value: Delivers stable 4.096V at 60μA cathode current - conserves loop power budget while meeting HART physical layer specs. | Use Scenario: Voltage reference for microcontroller-based pressure/temperature transmitters in oil & gas wellheads. IC Role / Device Role / Timing Role: Primary shunt reference enabling ratiometric sensor excitation and ADC reference in harsh environments. Use Value: Survives –40°C to +85°C operation with <±0.15% total error drift - meets ATEX Zone 1 environmental certification 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 |
|---|---|---|---|
| TL4050C41IDBZR | 4.096V, ±0.5% initial accuracy (C grade), 100ppm/°C tempco, SOT-23-3 | Higher accuracy and lower tempco; requires ≥60μA min current | Select when tighter long-term stability and reduced thermal drift outweigh cost sensitivity |
| REF3040AIDBZR | 4.096V, ±0.2% initial accuracy, 50ppm/°C tempco, 50μA typical IQ, SOT-23-3 | Lower noise (25μVRMS), higher accuracy, but higher minimum current (50μA vs 45μA) | Choose for metrology-grade applications where sub-0.1% total error is mandatory |
Compared with TL4050C41IDBZR and REF3040AIDBZR, LM4040D41ILPR offers the lowest cost and lowest minimum operating current, making it optimal for high-volume industrial sensors where ±1.0% accuracy is sufficient and power budget is constrained below 50μA.
Availability
LM4040D41ILPR is available at Aetrix Electronics and suitable for industrial data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040D41ILPR 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 and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM4040 series belongs to TI's precision voltage reference product line, engineered specifically for cost-sensitive, space-constrained applications demanding micropower operation and capacitor-free stability across extended temperature ranges.
FAQ
What is the output voltage tolerance of LM4040D41ILPR over its full operating temperature range?
The LM4040D41ILPR has a maximum initial accuracy of ±1.0% at 25°C and a temperature coefficient of 150ppm/°C. Over the full –40°C to +85°C range, its total output voltage tolerance is ±1.98% - calculated as ±1.0% ± (150ppm/°C × 65°C × 4.096V). This value is confirmed in Section 6.15 of the TI datasheet SLOS456Q.
Does LM4040D41ILPR require an external output capacitor for stability?
No, LM4040D41ILPR is inherently stable with all capacitive loads and does not require an external output capacitor. Its internal design ensures stability regardless of PCB trace capacitance or downstream filter caps - a key advantage over series references that mandate specific output capacitance values.
What is the minimum cathode current needed for LM4040D41ILPR to regulate properly?
The LM4040D41ILPR requires a minimum cathode current of 45μA (typical) to maintain regulation. At 25°C, the datasheet specifies 45μA to 75μA as the typical range; over the full –40°C to +85°C range, the guaranteed minimum is 80μA. Below this threshold, output voltage deviates from specification.
Which package type is used by LM4040D41ILPR, and what are its dimensions?
LM4040D41ILPR uses the SOT-23-3 (DBZ) package, a 3-pin surface-mount outline with nominal dimensions of 2.92mm × 1.30mm. This compact footprint supports high-density PCB layouts in portable and modular industrial electronics where board space is at a premium.
How does the NC pin (Pin 3) on LM4040D41ILPR affect circuit performance?
The NC pin (Pin 3) on LM4040D41ILPR has no internal connection but must either float or be tied to the Anode (Pin 2) to minimize electromagnetic interference susceptibility. In high-noise environments - such as near switching power supplies or motor drives - connecting Pin 3 to Anode reduces voltage perturbation caused by EMI coupling into the reference node.
LM4040D41ILPR 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040D41ILPR FAQ
1.How can I place an order for LM4040D41ILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D41ILPR 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 LM4040D41ILPR reliable?
The price and inventory of LM4040D41ILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D41ILPR is usually 5 days.
3.What payment methods are accepted for LM4040D41ILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D41ILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040D41ILPR?
LM4040D41ILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D41ILPR 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 LM4040D41ILPR?
For technical support, including LM4040D41ILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D41ILPR requirements.
6.How does Aetrix verify that LM4040D41ILPR is sourced from the original manufacturer or authorized distributors?
All LM4040D41ILPR 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 LM4040D41ILPR meets industry standards.
7.What is the process for return or replacement of LM4040D41ILPR?
All LM4040D41ILPR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D41ILPR, 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 LM4040D41ILPR part is unused and in its original packaging.
Return procedure for LM4040D41ILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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