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Texas Instruments LM4040C41IDBZT
- Part No.:
- LM4040C41IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C41IDBZT.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:797
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Product details
Overview
LM4040C41IDBZT from Texas Instruments is a precision micropower shunt voltage reference with 4.096V 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 high-resolution ADC/DAC biasing and sensor signal conditioning circuits.
For engineers reviewing the LM4040C41IDBZT datasheet, LM4040C41IDBZT pinout, LM4040C41IDBZT application, or LM4040C41IDBZT equivalent, key selection criteria include its SOT-23-3 package, industrial temperature range (–40°C to +85°C), no-output-capacitor requirement, and compatibility with capacitive loads in space-constrained analog front-ends.
Technical Context
The LM4040C41IDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 4.096V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without external components.
It delivers stable regulation across a 45μA–15mA operating current range and –40°C to +85°C ambient temperature, with low dynamic impedance (≤0.9Ω at 1mA) and minimal thermal hysteresis (0.08%). No output capacitor is required, and it remains stable under all capacitive load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; enables exact 12-bit full-scale scaling in 5V-system ADCs (e.g., 4.096V = 2¹² × 1mV) |
| Initial Accuracy | ±0.5% at 25°C; ensures ≤20.5mV absolute error before temperature drift compensation |
| Temp Coefficient | 100ppm/°C max; contributes ≤6.5mV drift over –40°C to +85°C ambient range |
| Operating Current | 45μA to 15mA; supports ultra-low-power sensor nodes and high-current precision DAC references |
| Output Noise | 35μVRMS (10Hz–10kHz); avoids quantization noise floor degradation in 16-bit+ data acquisition |
| Dynamic Impedance | ≤0.9Ω at 1mA; minimizes load-induced voltage shift in varying-current applications |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, tape-and-reel compatible, suitable for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input | Connects to regulated voltage node; sinks current to set reference potential |
| Anode (Pin 2) | Common ground reference | Must be tied to system ground; defines 0V reference for output voltage measurement |
| NC (Pin 3) | No internal connection | Left unconnected; floating or tied to anode only in high-EMI environments per TI recommendation |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Eliminates BOM cost and PCB area for stabilization caps; simplifies layout in dense analog sections |
| Wide cathode current range | 45μA minimum enables use in <100μA battery-powered sensors; 15mA max supports driving multiple op-amp bias networks |
| Low wideband noise | 35μVRMS ensures reference does not dominate system noise floor in precision instrumentation amplifiers |
| Stable with all capacitive loads | Prevents oscillation when driving ADC input capacitance or long PCB traces without RC snubbing |
| Thermal hysteresis | 0.08% max ensures repeatable voltage after thermal cycling-critical for calibration-critical field transmitters |
Applications
| Industrial Analog Input Module | Energy Infrastructure Metering |
|---|---|
Use Scenario: High-accuracy 16-bit analog input channel in PLC I/O modules measuring 4–20mA loop signals and thermocouple outputs. IC Role / Device Role / Timing Role: Provides stable 4.096V reference for SAR ADC and programmable gain amplifier biasing. Use Value: Enables ±0.05% total unadjusted error (TUE) across temperature via C-grade accuracy and 100ppm/°C drift control. | Use Scenario: Revenue-grade electricity meter requiring metrology-grade voltage reference for polyphase energy calculation. IC Role / Device Role / Timing Role: Supplies precision reference to isolated sigma-delta ADC measuring phase voltages in 3-phase distribution systems. Use Value: Delivers long-term stability (120ppm/1000h) and low noise to meet IEC 62053-21 Class 0.2 accuracy requirements. |
| Field Transmitter Signal Conditioning | Precision Audio DC Biasing |
Use Scenario: Loop-powered 4–20mA transmitter in hazardous areas, converting RTD or pressure sensor output to standardized current. IC Role / Device Role / Timing Role: Sets excitation voltage for 3-wire RTD bridge and reference for current-loop DAC. Use Value: Maintains accuracy over –40°C to +85°C with <0.08% thermal hysteresis-ensuring repeatability after ambient cycling. | Use Scenario: High-fidelity audio codec requiring ultra-low-noise DC bias for microphone preamplifier and ADC input stages. IC Role / Device Role / Timing Role: Generates clean 4.096V common-mode voltage for differential audio signal paths. Use Value: 35μVRMS noise prevents audible hiss; zero-capacitor operation avoids phase-shift artifacts in AC-coupled audio chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | 3.0ppm/°C typical TC (vs. 100ppm/°C max), 25μVRMS noise, but requires ≥50μA min current and 100nF output cap | Better for lab-grade instruments; unsuitable where cap-free operation or ultra-low IQ is mandatory | Select REF3040AIDBZR only if lower drift/noise justifies added capacitor and higher minimum current |
| ADR3440ARJZ-R7 | 30ppm/°C max TC, 12μVRMS noise, SOT-23-5 package with enable pin; needs 100nF output cap | Preferred for battery-powered devices needing shutdown mode; incompatible with cap-free designs | Choose ADR3440ARJZ-R7 when system-level power gating is required and board space allows extra pin/cap |
Compared with REF3040AIDBZR and ADR3440ARJZ-R7, the LM4040C41IDBZT uniquely combines cap-free stability, micropower operation (45μA), and SOT-23-3 simplicity-making it optimal for cost-sensitive, space-constrained industrial analog front-ends where moderate drift is acceptable.
Availability
LM4040C41IDBZT is available at Aetrix Electronics and suitable for industrial analog input modules, energy infrastructure metering, field transmitter signal conditioning, and precision audio DC biasing requiring stable component supply across extended production lifecycles.
Supply support for LM4040C41IDBZT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in portable and industrial systems where simplicity, small size, and robustness outweigh ultra-low-drift requirements.
FAQ
What is the maximum cathode current rating for LM4040C41IDBZT?
The LM4040C41IDBZT has an absolute maximum cathode current of 25mA, but its 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 LM4040C41IDBZT require an output capacitor for stability?
No, the LM4040C41IDBZT is explicitly designed to be stable with all capacitive loads and requires no output capacitor. This is confirmed in TI's datasheet Section 1 (Features) and Section 3 (Description), enabling simplified layout and reduced BOM count in space-constrained designs.
What is the temperature range specification for LM4040C41IDBZT?
The LM4040C41IDBZT is rated for industrial temperature operation from –40°C to +85°C. This is indicated by the "I" suffix in the part number and verified in the Device Comparison Table (Section 4) and Recommended Operating Conditions (Section 6.3) of the TI datasheet.
How does the 4.096V output voltage of LM4040C41IDBZT benefit data acquisition systems?
The 4.096V output of LM4040C41IDBZT directly supports 12-bit resolution (2¹² = 4096) in ADC applications-each LSB equals exactly 1mV. This eliminates software scaling errors and simplifies firmware development in precision data loggers and sensor interfaces.
Can LM4040C41IDBZT be used in automotive applications?
The LM4040C41IDBZT is not qualified for automotive use (AEC-Q100). It is specified only for industrial temperature range (–40°C to +85°C), whereas automotive applications typically require extended range (–40°C to +125°C) and qualification-such as the LM4040C41Q variant, which carries the "Q" suffix.
LM4040C41IDBZT 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 88 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C41IDBZT FAQ
1.How can I place an order for LM4040C41IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C41IDBZT 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 LM4040C41IDBZT reliable?
The price and inventory of LM4040C41IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C41IDBZT is usually 5 days.
3.What payment methods are accepted for LM4040C41IDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C41IDBZT transactions.
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4.How is shipping managed for LM4040C41IDBZT?
LM4040C41IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C41IDBZT 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 LM4040C41IDBZT?
For technical support, including LM4040C41IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C41IDBZT requirements.
6.How does Aetrix verify that LM4040C41IDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040C41IDBZT 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 LM4040C41IDBZT meets industry standards.
7.What is the process for return or replacement of LM4040C41IDBZT?
All LM4040C41IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C41IDBZT, 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 LM4040C41IDBZT part is unused and in its original packaging.
Return procedure for LM4040C41IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C41IDBZT Tags
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TL431AIDBZR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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