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Texas Instruments LM4040C82ILP
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- Part No.:
- LM4040C82ILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040C82ILP.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,622
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Product details
Overview
LM4040C82ILP from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 8.192V output with ±0.5% initial accuracy (C grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current - used in high-resolution data-acquisition systems requiring low-drift, low-noise analog references.
For engineers reviewing the LM4040C82ILP datasheet, LM4040C82ILP pinout, LM4040C82ILP application, or LM4040C82ILP equivalent, key selection factors include its industrial-temperature (–40°C to +85°C) rating, SOT-23-3 (DBZ) package, no-output-capacitor requirement, and compatibility with capacitive loads across portable and industrial sensing designs.
Technical Context
The LM4040C82ILP operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 8.192V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed bandgap core achieves tight initial tolerance and low thermal drift without external components.
It features low dynamic impedance (≤0.9Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm over 1000 hours - enabling stable reference performance in battery-powered instrumentation and loop-powered field transmitters where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal; enables exact binary-scaled ADC/DAC reference for 13-bit resolution systems. |
| Initial Accuracy | ±0.5% at 25°C; ensures ≤±41mV absolute error before temperature or aging effects. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±8.2mV drift over –40°C to +85°C ambient range. |
| Operating Current | 45μA to 15mA cathode current; supports ultra-low-power sensor nodes and high-current precision buffers. |
| Output Noise | 35μVRMS (10Hz–10kHz); minimizes added noise in high-gain signal chains and 24-bit delta-sigma converters. |
| Dynamic Impedance | 0.9Ω typical at 1mA; maintains regulation stability under fast load transients in closed-loop feedback circuits. |
| Thermal Hysteresis | 0.08% (≈6.6mV); limits repeatability error after thermal cycling in outdoor or automotive environments. |
Pinout & Package
LM4040C82ILP is packaged in a 3-pin SOT-23 (DBZ) case measuring 2.92mm × 1.30mm, optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to regulated supply rail; sinks all excess current to maintain 8.192V across anode-cathode. |
| Anode (Pin 2) | Reference ground return | Typically tied to system ground; forms the 0V reference point for output voltage measurement. |
| NC (Pin 3) | No internal connection | Unused terminal; must be left floating or optionally tied to anode per EMI mitigation guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load up to 10μF; eliminates BOM cost and layout area for external stabilization caps. |
| Micropower startup | 45μA minimum cathode current enables use in energy-harvesting and coin-cell-powered applications. |
| Extended temperature range | Specified from –40°C to +85°C; supports industrial automation, process control, and automotive cabin electronics. |
| Low long-term drift | 120ppm shift after 1000 hours at 25°C; reduces calibration frequency in metrology-grade equipment. |
| EMI-robust pin configuration | NC pin can be bonded to anode to suppress high-frequency noise coupling in noisy power environments. |
Applications
| Data-Acquisition Systems | Field Transmitters |
|---|---|
Use Scenario: High-resolution 24-bit delta-sigma ADC front-end in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Provides stable 8.192V reference for ratiometric sensor excitation and ADC full-scale calibration. Use Value: Enables 13-bit effective resolution (8.192V = 213 × 1V step) with <±0.5 LSB total unadjusted error over temperature. | Use Scenario: 4–20mA loop-powered pressure transmitter operating in hazardous industrial zones. IC Role / Device Role / Timing Role: Supplies precision reference for DAC-based current loop modulation and sensor signal conditioning. Use Value: Maintains loop accuracy within ±0.1% FS over –40°C to +85°C using only 45μA quiescent current. |
| Energy Infrastructure | Analog Input Module |
Use Scenario: Smart electricity meter voltage channel calibration in ANSI C12.20-compliant meters. IC Role / Device Role / Timing Role: Serves as primary reference for isolation amplifier feedback and metrology ADC reference. Use Value: Delivers <10ppm/°C effective drift after system-level compensation, meeting Class 0.2 accuracy requirements. | Use Scenario: Modular I/O system with hot-swappable analog input cards for factory automation. IC Role / Device Role / Timing Role: Local reference source per channel to eliminate backplane reference crosstalk and routing loss. Use Value: Eliminates need for centralized reference distribution; supports channel-to-channel isolation and independent calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C82IDBZR | Same electrical specs; tape-and-reel packaging (3000 pcs/reel) vs. cut-tape (LM4040C82ILP). | Identical performance; optimized for automated SMT production instead of prototyping or low-volume builds. | Select LM4040C82IDBZR for high-volume manufacturing; LM4040C82ILP for evaluation and small-batch deployment. |
| MAX6008AEUR+T | 8.192V output, ±0.2% initial accuracy (A grade), 75ppm/°C tempco, but requires ≥60μA min current and has higher 50μVRMS noise. | Better accuracy/tempco but higher power and noise; less suitable for ultra-low-power or high-SNR applications. | Choose MAX6008AEUR+T only when tighter initial tolerance outweighs micropower and noise constraints. |
Compared with LM4040C82IDBZR, the LM4040C82ILP offers identical electrical behavior in cut-tape form for flexibility in sampling and pilot runs; versus MAX6008AEUR+T, it trades 0.3% accuracy for 15μVRMS lower noise and 15μA lower minimum current - critical for battery life and 24-bit converter SNR.
Availability
LM4040C82ILP is available at Aetrix Electronics and suitable for data-acquisition systems, field transmitters, and energy infrastructure applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for LM4040C82ILP 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 leadership in precision reference design.
The LM4040 series was developed to deliver cost-effective, space-efficient shunt references for portable and industrial instrumentation - emphasizing micropower operation, capacitor-free stability, and robust thermal performance without trimming.
FAQ
What is the maximum cathode current rating for LM4040C82ILP?
The LM4040C82ILP has an absolute maximum cathode current of 25mA per its datasheet Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability or temperature coefficient performance, so sustained operation above this level is not advised in precision applications.
Does LM4040C82ILP require an output capacitor for stability?
No, the LM4040C82ILP is explicitly designed to be stable with all capacitive loads and does not require an output capacitor. This is confirmed in both the Features list and Description section of the TI datasheet. Adding external capacitance will not harm stability but provides no benefit - simplifying BOM and layout for compact analog subsystems.
What is the thermal hysteresis specification for LM4040C82ILP?
The LM4040C82ILP 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. For the 8.192V output, this equates to approximately ±6.6mV, making it suitable for applications requiring repeatable reference performance after environmental temperature excursions.
Can LM4040C82ILP be used in automotive under-hood applications?
The LM4040C82ILP is rated for –40°C to +85°C operation (industrial grade), which covers most cabin and body-control applications but not under-hood environments exceeding 85°C. For under-hood use, TI's LM4040C82IQ (Q-grade, –40°C to +125°C) is the qualified alternative - the LM4040C82ILP itself is not specified or tested for extended temperature automotive operation.
How does the LM4040C82ILP achieve its 8.192V output voltage?
The LM4040C82ILP achieves its precise 8.192V output via laser-trimmed Zener-zap and fuse techniques during wafer sort, targeting the exact binary-scaled value ideal for 13-bit systems. This fixed-output architecture eliminates external resistive dividers, reducing component count and drift sources while maintaining tight initial tolerance and low temperature coefficient across the industrial temperature range.
LM4040C82ILP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
LM4040C82ILP FAQ
1.How can I place an order for LM4040C82ILP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C82ILP 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 LM4040C82ILP reliable?
The price and inventory of LM4040C82ILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C82ILP is usually 5 days.
3.What payment methods are accepted for LM4040C82ILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C82ILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C82ILP?
LM4040C82ILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C82ILP 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 LM4040C82ILP?
For technical support, including LM4040C82ILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C82ILP requirements.
6.How does Aetrix verify that LM4040C82ILP is sourced from the original manufacturer or authorized distributors?
All LM4040C82ILP 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 LM4040C82ILP meets industry standards.
7.What is the process for return or replacement of LM4040C82ILP?
All LM4040C82ILP units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C82ILP, 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 LM4040C82ILP part is unused and in its original packaging.
Return procedure for LM4040C82ILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C82ILP Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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