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Texas Instruments LM4040C82ILPR
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- Part No.:
- LM4040C82ILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM4040C82ILPR.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,281
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Product details
Overview
LM4040C82ILPR from Texas Instruments is a precision micropower shunt voltage reference with 8.192V nominal 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 reference in analog signal chains for industrial data acquisition and field transmitters.
For engineers reviewing the LM4040C82ILPR datasheet, LM4040C82ILPR pinout, LM4040C82ILPR application, or LM4040C82ILPR equivalent, key selection criteria include its 8.192V fixed output, SOT-23-3 package compatibility, –40°C to 85°C operating range, and absence of required output capacitance in high-impedance sensing nodes.
Technical Context
The LM4040C82ILPR operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 8.192V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves 0.5% initial tolerance and 100ppm/°C thermal drift over –40°C to 85°C without external compensation.
It delivers low dynamic impedance (≤0.9Ω at 1mA) and low noise (35μVRMS, 10Hz–10kHz), enabling high-resolution ADC biasing and sensor excitation where supply rejection and long-term stability are critical. No output capacitor is required, simplifying layout in space-constrained portable and industrial modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal; enables precise scaling for 13-bit+ SAR ADCs using binary-aligned references. |
| Initial Accuracy | ±0.5% at 25°C; ensures ≤±41mV absolute error before thermal drift correction. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±8.2mV drift over full –40°C to 85°C range. |
| Operating Current | 45μA to 15mA; supports ultra-low-power sensor nodes and high-current DAC references. |
| Output Noise | 35μVRMS (10Hz–10kHz); avoids noise-induced quantization errors in 16-bit+ measurement systems. |
| Dynamic Impedance | 0.9Ω typical at 1mA; maintains regulation under fast load transients in closed-loop feedback paths. |
Pinout & Package
LM4040C82ILPR is packaged in a 3-pin SOT-23 (DBZ) case measuring 2.92mm × 1.30mm, suitable for automated placement and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input | Connects to regulated voltage node; sinks current to establish 8.192V reference potential. |
| Anode (Pin 2) | Common ground reference | Must be tied to system ground; defines return path for cathode current and sets reference zero point. |
| NC (Pin 3) | No internal connection | Float or tie to anode only in high-EMI environments; no functional role in standard operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 8.192V output | Binary-aligned voltage ideal for 13-bit ADC full-scale calibration and digital potentiometer scaling. |
| Stable with all capacitive loads | Eliminates need for output capacitor-reduces BOM count and layout sensitivity in remote sensor interfaces. |
| Wide operating current range | 45μA minimum enables use in battery-powered transmitters; 15mA max supports high-precision DAC buffers. |
| Low temperature hysteresis | 0.08% thermal hysteresis ensures repeatable voltage after thermal cycling in outdoor industrial enclosures. |
Applications
| Data-Acquisition Systems | Field Transmitters |
|---|---|
Use Scenario: High-resolution 16-bit SAR ADC front-end in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Provides stable 8.192V reference for ADC VREF input, enabling accurate ratiometric conversion of 4–20mA loop signals. Use Value: 0.5% initial accuracy and 100ppm/°C drift ensure <±0.1% total unadjusted error over industrial temperature range without calibration. | Use Scenario: Two-wire 4–20mA smart transmitter powering its own electronics from loop current while maintaining sensor accuracy. IC Role / Device Role / Timing Role: Shunt reference establishes precise excitation voltage for RTD or strain gauge bridges, referenced to loop ground. Use Value: Micropower 45μA start-up current allows reliable turn-on below 4mA loop threshold; low noise prevents signal corruption in µV-level bridge outputs. |
| Energy Infrastructure | Automotive Electronics |
Use Scenario: Voltage monitoring in solar inverter DC-link sensing, where isolation and long-term stability are critical. IC Role / Device Role / Timing Role: Supplies reference to isolated sigma-delta ADC measuring bus voltage up to 1000VDC. Use Value: 120ppm long-term stability (1000h) minimizes recalibration frequency in utility-grade metering equipment. | Use Scenario: Cabin temperature sensor signal conditioning in automotive HVAC control units operating across –40°C to 125°C ambient. IC Role / Device Role / Timing Role: Reference for thermistor-to-voltage conversion circuit, sharing ground with microcontroller ADC. Use Value: C-grade tolerance and 100ppm/°C coefficient meet AEC-Q200 Class 2 requirements for under-hood sensors with minimal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C82IDBZR | Same 8.192V output, ±0.5% tolerance, but higher 50ppm/°C tempco and 40μA min current. | Lower noise (20μVRMS) suits audio-grade references; tighter tempco benefits narrow-temp-range consumer gear. | Select TL4050C82IDBZR when lower noise and tighter thermal drift outweigh LM4040C82ILPR's broader current range. |
| MAX6008AEUR+T | 8.192V output, ±0.2% initial accuracy (A grade), 75ppm/°C tempco, 60μA min current. | Higher accuracy enables single-point calibration in test equipment; smaller SC70-3 footprint saves board area. | Choose MAX6008AEUR+T for metrology-grade instruments requiring <±0.3% total error without trimming. |
Compared with TL4050C82IDBZR and MAX6008AEUR+T, the LM4040C82ILPR offers the widest operating current range (45μA–15mA) and highest noise immunity in EMI-prone industrial settings, making it optimal for ruggedized field instrumentation where layout constraints prevent shielding.
Availability
LM4040C82ILPR is available at Aetrix Electronics and suitable for data-acquisition systems, field transmitters, and energy infrastructure applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LM4040C82ILPR 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 engineered specifically for high-accuracy, low-power shunt reference applications in harsh environments-emphasizing stability, micropower operation, and robustness across extended temperature ranges.
FAQ
What is the maximum cathode current rating for LM4040C82ILPR?
The LM4040C82ILPR has an absolute maximum cathode current rating of 25mA per its datasheet Absolute Maximum Ratings table. However, the recommended operating condition specifies a maximum cathode current of 15mA to ensure stable regulation, thermal performance, and long-term reliability. Exceeding 15mA may increase junction temperature beyond safe limits and accelerate parametric drift in the LM4040C82ILPR.
Does LM4040C82ILPR require an external output capacitor?
No, the LM4040C82ILPR does not require an external output capacitor. Its internal design provides inherent stability with all capacitive loads, including direct connection to ADC reference inputs or op-amp feedback networks. This eliminates capacitor-related aging, leakage, and layout sensitivity-key advantages confirmed in the LM4040C82ILPR datasheet Section 3 and Figure 8-2.
What is the thermal hysteresis specification for LM4040C82ILPR?
The LM4040C82ILPR exhibits 0.08% thermal hysteresis, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This value is consistent across all LM4040 grades and packages, and is explicitly specified in Table 6-5 through 6-22 of the LM4040C82ILPR datasheet for both industrial and extended temperature variants.
Can LM4040C82ILPR operate at –40°C to 125°C?
No, the LM4040C82ILPR is rated for operation from –40°C to 85°C only. The 'I' suffix in the part number denotes the industrial temperature grade. For –40°C to 125°C operation, TI offers the LM4040C82Q variant (e.g., LM4040C82QDBZR), which shares identical electrical specifications except for the extended temperature qualification and different ordering part number.
What is the long-term stability of LM4040C82ILPR after 1000 hours?
The LM4040C82ILPR demonstrates 120ppm long-term stability after 1000 hours of operation at 25°C with 100μA cathode current, as verified in the Electrical Characteristics tables (Sections 6.6–6.22). This metric reflects reversible parametric shift and is consistent across all LM4040C-grade devices, including the LM4040C82ILPR.
LM4040C82ILPR 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):
- 8.192V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 130µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 110 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040C82ILPR FAQ
1.How can I place an order for LM4040C82ILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C82ILPR 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 LM4040C82ILPR reliable?
The price and inventory of LM4040C82ILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C82ILPR is usually 5 days.
3.What payment methods are accepted for LM4040C82ILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C82ILPR transactions.
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LM4040C82ILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C82ILPR 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 LM4040C82ILPR?
For technical support, including LM4040C82ILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C82ILPR requirements.
6.How does Aetrix verify that LM4040C82ILPR is sourced from the original manufacturer or authorized distributors?
All LM4040C82ILPR 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 LM4040C82ILPR meets industry standards.
7.What is the process for return or replacement of LM4040C82ILPR?
All LM4040C82ILPR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C82ILPR, 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 LM4040C82ILPR part is unused and in its original packaging.
Return procedure for LM4040C82ILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C82ILPR Tags
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