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Texas Instruments LM4040B82IDBZR
- Part No.:
- LM4040B82IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B82IDBZR.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,161
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Product details
Overview
LM4040B82IDBZR from Texas Instruments is a precision 8.192V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation, with ±0.2% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a low-drift, low-noise reference in high-resolution ADCs and sensor signal chains.
For engineers reviewing the LM4040B82IDBZR datasheet, LM4040B82IDBZR pinout, LM4040B82IDBZR application, or LM4040B82IDBZR equivalent, key selection criteria include output tolerance at 25°C and full temperature range, minimum operating current, dynamic impedance, thermal hysteresis, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040B82IDBZR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 8.192V reverse breakdown voltage across its terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming to achieve B-grade (0.2%) initial accuracy and tight 100ppm/°C tempco over –40°C to 85°C.
It delivers stable regulation with no output capacitor required and remains functional across a 45μA–15mA cathode current range. Low 0.8Ω typical dynamic impedance and 35μVRMS noise support high-precision analog measurement systems where reference stability directly impacts ENOB and offset drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal reverse breakdown voltage at IZ = 100μA, enabling exact binary-scaled reference for 13-bit+ data converters. |
| Initial Accuracy | ±0.2% maximum at 25°C (B grade), corresponding to ±16.4mV tolerance - critical for calibration-critical instrumentation. |
| Tempco | 100ppm/°C max over –40°C to 85°C, contributing ≤±0.82V drift across full range - ensures <0.01% FS error in industrial sensors. |
| Min Cathode Current | 45μA typical, allowing ultra-low-power operation in battery-powered field transmitters and portable DAQ systems. |
| Dynamic Impedance | 0.8Ω typical at IZ = 1mA, f = 120Hz - minimizes load-induced voltage shift during fast current transients. |
| Wideband Noise | 35μVRMS (10Hz–10kHz), supporting <16-bit effective resolution in precision ADC front-ends without additional filtering. |
| Thermal Hysteresis | 0.08% - limits repeatability error after thermal cycling, essential for metrology-grade calibration equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient with RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks all cathode current (IZ) to maintain 8.192V drop - must be decoupled per layout guidelines. |
| Anode (Pin 2) | Common reference ground | Typically tied to system ground; forms return path for cathode current - low-impedance grounding essential for noise performance. |
| NC (Pin 3) | No internal connection | Unused terminal; must remain floating or tied to anode only in high-EMI environments per TI recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies layout and reduces BOM count in space-constrained modules. |
| Low 35μVRMS noise | Enables direct interface with 16-bit SAR ADCs without post-regulation filtering, preserving SNR and THD. |
| 45μA min operating current | Supports micropower designs including loop-powered 4–20mA transmitters and energy-harvesting sensor nodes. |
| –40°C to 85°C operation | Qualified for industrial ambient environments - suitable for factory automation, motor control, and PLC analog I/O. |
| 0.08% thermal hysteresis | Ensures repeatable voltage after thermal cycling - critical for automated test equipment requiring traceable calibration. |
Applications
| Industrial Data Acquisition | Field Transmitter Calibration |
|---|---|
Use Scenario: High-resolution 16-bit ADC front-end in modular DAQ systems measuring temperature, pressure, and strain. IC Role / Device Role / Timing Role: Precision voltage reference establishing absolute scale for analog-to-digital conversion. Use Value: 8.192V output matches binary scaling of 13-bit words (213 = 8192), minimizing digital gain error in firmware. |
Use Scenario: 4–20mA loop-powered transmitter with onboard sensor conditioning and microcontroller-based linearization. IC Role / Device Role / Timing Role: Stable excitation and reference source for bridge sensors and ADC reference inputs. Use Value: 45μA minimum current enables operation from low-voltage loop drops; 100ppm/°C tempco maintains <0.1% span error over –40°C to 70°C ambient. |
| Energy Infrastructure Monitoring | Precision Audio Level Detection |
Use Scenario: Grid-edge metering unit monitoring AC voltage/current harmonics and power quality parameters. IC Role / Device Role / Timing Role: Reference for isolation-amplified voltage sensing and anti-aliasing filter biasing. Use Value: 35μVRMS noise prevents reference-induced distortion in FFT-based harmonic analysis; stable regulation ensures consistent RMS calculation accuracy. |
Use Scenario: Analog VU meter or peak detector in professional audio interfaces requiring accurate dBFS scaling. IC Role / Device Role / Timing Role: Fixed reference for comparator thresholds and logarithmic amplifier biasing. Use Value: 0.2% initial accuracy ensures ±0.1dB absolute level accuracy; low hysteresis prevents drift between warm-up and operational states. |
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 | ±0.5% initial accuracy (C grade), same 8.192V output, identical package and tempco. | Acceptable where cost sensitivity outweighs need for tighter calibration; higher tolerance increases system gain error. | Select when full-system calibration compensates for reference error, or for non-critical biasing functions. |
| REF43GM | 8.192V output, ±0.05% initial accuracy, 3ppm/°C tempco, SOIC-8 package, higher quiescent current (1.2mA). | Higher precision and lower drift, but requires PCB area and power budget for active circuitry. | Choose for metrology-grade instruments or when long-term stability (<20ppm/1000h) is mandatory. |
Compared with LM4040C82IDBZR, the LM4040B82IDBZR provides 2.5× tighter initial accuracy at minimal cost premium; versus REF43GM, it trades 0.15% absolute accuracy and ultra-low drift for 25× lower operating current and 60% smaller footprint - ideal for embedded industrial sensors.
Availability
LM4040B82IDBZR is available at Aetrix Electronics and suitable for industrial data acquisition, field transmitter calibration, and energy infrastructure monitoring requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040B82IDBZR 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 high-reliability manufacturing.
The LM4040 series was engineered for cost-sensitive, space-constrained applications demanding micropower operation and robust performance across industrial temperature ranges - particularly in sensor signal conditioning and data converter reference circuits.
FAQ
What is the output voltage tolerance of LM4040B82IDBZR over its full operating temperature range?
The LM4040B82IDBZR has a maximum initial tolerance of ±0.2% at 25°C and a total overtemperature tolerance of ±0.85% across –40°C to 85°C, calculated as ±0.2% ± (100ppm/°C × 65°C × 8.192V). This yields a worst-case output range of 8.122V to 8.262V, verified in TI's Electrical Characteristics tables for LM4040B82I devices.
Can LM4040B82IDBZR operate without an output capacitor?
Yes, LM4040B82IDBZR is explicitly designed to be stable with all capacitive loads and requires no output capacitor for regulation. This is confirmed in the device description and "Stable with all capacitive loads" feature bullet - a key differentiator from series references that mandate specific output capacitance.
What is the minimum cathode current required for LM4040B82IDBZR to maintain regulation?
The LM4040B82IDBZR requires a minimum cathode current of 45μA (typical) to maintain regulation, with 80μA specified as the maximum value across the full –40°C to 85°C range. This ultra-low current enables use in micropower applications such as battery-backed sensor nodes and energy-harvesting systems.
How does the thermal hysteresis specification impact system calibration of LM4040B82IDBZR?
LM4040B82IDBZR 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 equals ±6.6mV, directly limiting repeatability in automated calibration workflows where thermal cycling occurs between test steps.
Is LM4040B82IDBZR pin-compatible with other LM4040 variants in SOT-23-3 package?
Yes, all LM4040x82IDBZR variants (A/B/C/D grades) share identical SOT-23-3 (DBZ) pinout: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC. This allows direct substitution within the same grade family without PCB changes - confirmed in TI's Pin Configuration and Functions section (Figure 5-1 and Table 5-1).
LM4040B82IDBZR 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:
- ±0.2%
- 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
LM4040B82IDBZR FAQ
1.How can I place an order for LM4040B82IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B82IDBZR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of LM4040B82IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B82IDBZR is usually 5 days.
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For technical support, including LM4040B82IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B82IDBZR requirements.
6.How does Aetrix verify that LM4040B82IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040B82IDBZR 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 LM4040B82IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040B82IDBZR?
All LM4040B82IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B82IDBZR, 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 LM4040B82IDBZR part is unused and in its original packaging.
Return procedure for LM4040B82IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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