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Texas Instruments LM4040A82IDBZTG4
- Part No.:
- LM4040A82IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A82IDBZTG4.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,871
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Product details
Overview
LM4040A82IDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference with 8.192V nominal output, ±0.1% initial accuracy (A grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a stable voltage reference in high-resolution ADC/DAC biasing, sensor excitation, and industrial analog input modules.
For engineers reviewing the LM4040A82IDBZTG4 datasheet, LM4040A82IDBZTG4 pinout, LM4040A82IDBZTG4 application, or LM4040A82IDBZTG4 equivalent, key selection criteria include initial tolerance at 25°C, thermal drift over –40°C to 85°C, dynamic impedance under varying load current, noise performance in low-level signal chains, and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4040A82IDBZTG4 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-zap trimmed silicon junction delivers tight initial tolerance without external components.
It exhibits low dynamic impedance (≤0.8Ω at 1mA), minimal voltage variation (<8mV) across 1mA–15mA cathode current range, and thermal hysteresis of only 0.08% - enabling stable reference performance in cyclic temperature environments typical of field transmitters and energy infrastructure monitoring systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal; enables exact binary-scaled reference for 13-bit ADCs and DACs |
| Initial Accuracy | ±0.1% at 25°C; supports <±10mV absolute error in precision measurement front-ends |
| Temp Coefficient | 100ppm/°C max; contributes ≤±8.2mV drift over –40°C to 85°C operating range |
| Noise (10Hz–10kHz) | 35μVRMS typical; avoids degradation of ENOB in 16-bit+ data acquisition systems |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered sensor nodes |
| Dynamic Impedance | 0.3–0.8Ω at 1mA; ensures <1mV output shift under 1mA load transients |
| Operating Temp Range | –40°C to +85°C; qualified for industrial ambient conditions per LM4040xxxI specification |
Pinout & Package
LM4040A82IDBZTG4 is packaged in a 3-pin SOT-23 (DBZ) surface-mount package measuring 2.92mm × 1.30mm. The device uses a two-terminal shunt configuration with an optional third terminal for EMI mitigation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to regulated supply rail; sinks all reference current plus load current |
| Anode (Pin 2) | Common return / ground reference | Typically tied to system ground; defines 0V reference point for output voltage |
| NC (Pin 3) | No internal connection | Must float or connect to anode in high-EMI environments (e.g., near switching power supplies) |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies layout and reduces BOM count in compact designs |
| Low 35μVRMS noise | Preserves signal integrity in high-gain instrumentation amplifiers and precision ADC references |
| Wide 45μA–15mA operating current | Supports both ultra-low-power wake-up circuits and high-current buffer stages without redesign |
| 100ppm/°C tempco (A grade) | Meets tight drift requirements for Class A industrial sensors and calibration equipment |
| Thermal hysteresis ≤0.08% | Ensures repeatable voltage after thermal cycling - critical for field-deployed metering devices |
Applications
| Industrial Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: 16-bit isolated analog input channel conditioning voltage for RTD, thermocouple, and strain gauge signals. IC Role / Device Role / Timing Role: Provides stable 8.192V reference for ADC full-scale range and sensor excitation current source. Use Value: Enables ±0.0015% full-scale accuracy by limiting reference drift contribution to <±1 LSB over temperature. | Use Scenario: Multi-channel simultaneous sampling system for power quality monitoring in substations. IC Role / Device Role / Timing Role: Supplies common reference to multiple SAR ADCs and anti-aliasing filter op-amps. Use Value: Low 35μVRMS noise prevents SNR degradation; 0.1% tolerance ensures inter-channel gain matching within 0.02%. |
| Field Transmitter | Energy Infrastructure Monitoring |
Use Scenario: Loop-powered 4–20mA transmitter with HART communication, operating in ambient –40°C to +85°C. IC Role / Device Role / Timing Role: Sets precision voltage for current loop regulation and digital sensor interface biasing. Use Value: 100ppm/°C tempco and 0.08% thermal hysteresis ensure long-term calibration stability without field recalibration. | Use Scenario: Smart electricity meter with metrology-grade ADC and tamper-detection circuitry. IC Role / Device Role / Timing Role: Reference for polyphase energy measurement ASIC and auxiliary supply monitoring comparator. Use Value: 45μA min cathode current allows operation during low-power "meter sleep" mode while maintaining reference integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040B82IDBZT | ±0.2% initial accuracy (B grade), same 100ppm/°C tempco and 8.192V output | Acceptable where ±20mV reference error is tolerable (e.g., non-critical biasing) | Select when cost sensitivity outweighs need for <±10mV absolute accuracy |
| REF3082AIDBZR | 8.20V output, ±0.2% accuracy, 50ppm/°C tempco, 3.3V–5.5V supply requirement (series topology) | Requires external supply; unsuitable for shunt-based floating or high-side sensing topologies | Choose only if lower tempco is prioritized and series-reference architecture is feasible |
Compared with LM4040B82IDBZT, the LM4040A82IDBZTG4 provides twice the initial accuracy at identical tempco and noise; versus REF3082AIDBZR, it eliminates supply dependency and supports true two-terminal operation but trades 50ppm/°C for 100ppm/°C drift control.
Availability
LM4040A82IDBZTG4 is available at Aetrix Electronics and suitable for industrial analog input modules, field transmitters, and energy infrastructure monitoring systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040A82IDBZTG4 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM4040 series was designed specifically for high-accuracy, low-power shunt voltage reference applications in industrial, test & measurement, and sensor signal conditioning systems - emphasizing stability, noise performance, and ease of use without external compensation.
FAQ
What is the output voltage tolerance of LM4040A82IDBZTG4 at 25°C?
The LM4040A82IDBZTG4 has a ±0.1% initial output voltage tolerance at 25°C, corresponding to ±8.2mV around its nominal 8.192V output. This A-grade specification is verified per TI's SLOS456Q datasheet Section 6.19 and applies to the LM4040A82I family variant in SOT-23 packaging. The LM4040A82IDBZTG4 meets this tolerance without calibration or trimming.
Does LM4040A82IDBZTG4 require an output capacitor for stability?
No, the LM4040A82IDBZTG4 is inherently stable with all capacitive loads and does not require an output capacitor. Its two-terminal shunt architecture and internal design eliminate oscillation risk even with large (>1μF) bypass capacitors on the cathode node. This feature is explicitly stated in the TI datasheet Section 1 Features and Section 3 Description, simplifying layout for space-constrained applications.
What is the minimum cathode current needed for LM4040A82IDBZTG4 to regulate properly?
The LM4040A82IDBZTG4 requires a minimum cathode current of 45μA (typical) to maintain regulation within specifications. At currents below this threshold, output voltage may deviate beyond the ±0.1% tolerance band. This value is specified in TI's SLOS456Q datasheet Table 6.19 for the LM4040A82I variant and confirmed across temperature ranges from –40°C to +85°C.
How does the noise performance of LM4040A82IDBZTG4 impact precision ADC applications?
The LM4040A82IDBZTG4 delivers 35μVRMS wideband noise (10Hz–10kHz), directly limiting the effective number of bits (ENOB) in high-resolution ADCs. For a 16-bit, 8.192V-full-scale ADC, this noise contributes <0.5 LSB RMS, preserving >15.5 ENOB. This performance is validated in TI's datasheet Section 6.19 and makes LM4040A82IDBZTG4 suitable for metrology-grade data acquisition where reference noise dominates system error budget.
Is LM4040A82IDBZTG4 rated for operation beyond 85°C ambient temperature?
No, the LM4040A82IDBZTG4 is characterized for operation from –40°C to +85°C ambient temperature (industrial grade, denoted by "I" suffix). It is not rated for extended temperature range (–40°C to +125°C), which applies only to "Q"-suffix variants like LM4040C82Q. Using LM4040A82IDBZTG4 above 85°C ambient risks exceeding its specified electrical characteristics and thermal limits per Section 6.3 of the TI datasheet.
LM4040A82IDBZTG4 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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 8.192V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- 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
LM4040A82IDBZTG4 FAQ
1.How can I place an order for LM4040A82IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A82IDBZTG4 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 LM4040A82IDBZTG4 reliable?
The price and inventory of LM4040A82IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A82IDBZTG4 is usually 5 days.
3.What payment methods are accepted for LM4040A82IDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040A82IDBZTG4 transactions.
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4.How is shipping managed for LM4040A82IDBZTG4?
LM4040A82IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040A82IDBZTG4 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 LM4040A82IDBZTG4?
For technical support, including LM4040A82IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A82IDBZTG4 requirements.
6.How does Aetrix verify that LM4040A82IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040A82IDBZTG4 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 LM4040A82IDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040A82IDBZTG4?
All LM4040A82IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A82IDBZTG4, 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 LM4040A82IDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040A82IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A82IDBZTG4 Tags
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LM4040DIM3X-2.5/NOPB
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