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Texas Instruments LM4040C82IDBZR
- Part No.:
- LM4040C82IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C82IDBZR.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,389
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Product details
Overview
LM4040C82IDBZR 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, capacitor-free reference in high-accuracy analog signal chains for industrial data acquisition and field transmitters.
For engineers reviewing the LM4040C82IDBZR datasheet, LM4040C82IDBZR pinout, LM4040C82IDBZR application, or LM4040C82IDBZR equivalent, key selection criteria include its 8.192V fixed output, SOT-23-3 package compatibility, –40°C to 85°C operating range, low dynamic impedance (<0.9Ω), and guaranteed thermal hysteresis of ≤0.08%.
Technical Context
The LM4040C82IDBZR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 8.192V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed bandgap core delivers tight initial tolerance and predictable temperature drift over full industrial temperature range.
It requires no external output capacitor and remains stable with all capacitive loads due to inherent low dynamic impedance (0.3–0.9Ω) and low noise design. The device's minimum operating current is 45μA typical, enabling use in ultra-low-power sensor front-ends and battery-operated instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal at IZ = 100μA; enables precise 12-bit+ ADC/DAC biasing and ratiometric scaling |
| Initial Accuracy | ±0.5% max at 25°C (C grade); supports <12-bit system accuracy without calibration |
| Temp Coefficient | 100ppm/°C max over –40°C to 85°C; contributes ≤±0.82mV drift across full range |
| Noise (10Hz–10kHz) | 35μVRMS typical; minimizes quantization error in high-resolution measurement systems |
| Dynamic Impedance | 0.3–0.9Ω at IZ = 1mA; ensures stable regulation under varying load current conditions |
| Operating Current | 45μA to 15mA cathode current range; compatible with microcontroller-based low-power designs |
| Thermal Hysteresis | ≤0.08% after –40°C/125°C cycling; preserves long-term repeatability in field-deployed equipment |
Pinout & Package
LM4040C82IDBZR 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 Connection) terminal - must be left floating or tied to Anode per TI EMI guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks current to maintain 8.192V drop relative to Anode |
| Anode (Pin 2) | Reference ground / common return | Typically connected to system ground; defines voltage reference point for downstream circuitry |
| NC (Pin 3) | No internal connection | Must float or tie to Anode in high-noise environments to reduce EMI susceptibility |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 8.192V output | Enables direct interface with 12-bit/13-bit SAR ADCs using standard VREF scaling (e.g., 2.048V × 4) |
| Capacitor-free stability | Eliminates need for output bypass capacitor, reducing BOM count and PCB area in space-constrained modules |
| Low 45μA min current | Supports operation in always-on sensor nodes powered by coin cells or energy harvesters |
| 100ppm/°C tempco | Meets industrial-grade drift requirements for field transmitters operating across –40°C to 85°C |
| 35μVRMS noise | Preserves ENOB >11.5 bits in 16-bit delta-sigma ADC applications at 10SPS |
Applications
| Industrial Data Acquisition | Field Transmitter |
|---|---|
Use Scenario: High-accuracy 4–20mA loop-powered sensor with 16-bit ADC digitization. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 8.192V excitation and ADC reference. Use Value: Enables 0.05% full-scale linearity and <±0.1°C temperature sensor error over –25°C to 70°C ambient. |
Use Scenario: Two-wire smart pressure transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Precision reference for DAC-controlled current output stage and internal diagnostics. Use Value: Maintains 4–20mA output accuracy within ±0.025% of span across 15-year field life and thermal cycling. |
| Energy Infrastructure Monitoring | Automotive Battery Management |
Use Scenario: Grid-edge power quality analyzer with isolated voltage/current inputs. IC Role / Device Role / Timing Role: Primary reference for isolated sigma-delta ADCs measuring AC mains parameters. Use Value: Delivers <0.1% gain error stability over 10-year deployment in outdoor substations (–40°C to 85°C). |
Use Scenario: EV battery pack monitor IC requiring accurate cell voltage reference for SOC estimation. IC Role / Device Role / Timing Role: Secondary reference for auxiliary ADC channels measuring thermistors and supply rails. Use Value: Reduces voltage measurement uncertainty to ±1.5mV, improving state-of-charge resolution by 0.3%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C82IDCKR | Same 8.192V/C-grade spec, but in 5-pin SC-70 (DCK) package with two NC pins; 2.00mm × 1.25mm footprint | Preferred for ultra-dense layouts where SOT-23 height is constrained; requires different land pattern | Select when board space is prioritized over assembly compatibility with existing SOT-23 tooling |
| MAX6008AEUR+T | 8.192V output, ±0.2% initial accuracy (A grade), 75ppm/°C tempco, higher 60μA min current | Better accuracy/tempco but higher quiescent current; not qualified for extended temperature range | Choose for lab-grade instrumentation needing tighter specs, accepting higher power and narrower temp range |
Compared with LM4040C82IDBZR, LM4040C82IDCKR offers identical electrical performance in a smaller footprint but requires layout revision, while MAX6008AEUR+T trades lower drift and tighter tolerance for increased minimum current and reduced temperature coverage - making LM4040C82IDBZR optimal for cost-sensitive, wide-temp industrial deployments.
Availability
LM4040C82IDBZR is available at Aetrix Electronics and suitable for industrial data acquisition, field transmitter, and energy infrastructure monitoring applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM4040C82IDBZR 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 engineered for high-accuracy, low-power shunt reference applications in industrial, automotive, and instrumentation systems - emphasizing stability, ease of use, and robustness across extended temperature ranges.
FAQ
What is the maximum cathode current rating for LM4040C82IDBZR?
The absolute maximum continuous cathode current for LM4040C82IDBZR is 25mA, though the recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability; operation above 25mA risks permanent damage per TI's Absolute Maximum Ratings table.
Does LM4040C82IDBZR require an output capacitor for stability?
No, LM4040C82IDBZR is designed to be stable with all capacitive loads and does not require an external output capacitor. Its internal architecture ensures phase margin retention even with >1μF capacitance on the cathode node - a key advantage over older shunt references that mandate careful capacitor selection.
What is the thermal hysteresis specification for LM4040C82IDBZR?
LM4040C82IDBZR has a thermal hysteresis of ≤0.08% after cycling between –40°C and 125°C. This means the measured 8.192V output at 25°C deviates by no more than ±6.6mV before and after extreme temperature exposure - critical for field-replaceable modules requiring repeatable calibration.
Can LM4040C82IDBZR be used in automotive applications?
LM4040C82IDBZR is rated for –40°C to 85°C (industrial grade), not the full AEC-Q100 automotive temperature range. While it functions in cabin-located ECUs, TI does not qualify or warrant LM4040C82IDBZR for under-hood or safety-critical automotive use; the LM4040C82IQ variant is specified for –40°C to 125°C and preferred for such roles.
How does the NC pin (Pin 3) affect LM4040C82IDBZR performance?
Pin 3 of LM4040C82IDBZR is a no-connect terminal. TI recommends leaving it floating in benign environments, but tying it to the Anode (Pin 2) in high-EMI settings - such as near switching power supplies or motor drives - to suppress noise coupling and improve long-term voltage stability by up to 0.02%.
LM4040C82IDBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C82IDBZR FAQ
1.How can I place an order for LM4040C82IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C82IDBZR 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 LM4040C82IDBZR reliable?
The price and inventory of LM4040C82IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C82IDBZR is usually 5 days.
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LM4040C82IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C82IDBZR 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 LM4040C82IDBZR?
For technical support, including LM4040C82IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C82IDBZR requirements.
6.How does Aetrix verify that LM4040C82IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040C82IDBZR 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 LM4040C82IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040C82IDBZR?
All LM4040C82IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C82IDBZR, 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 LM4040C82IDBZR part is unused and in its original packaging.
Return procedure for LM4040C82IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C82IDBZR Tags
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