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Texas Instruments LM4040C30IDBZT
- Part No.:
- LM4040C30IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C30IDBZT.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,988
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Product details
Overview
LM4040C30IDBZT from Texas Instruments is a precision 3.0V shunt voltage reference in SOT-23-3 (DBZ) package, delivering ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, 45μA minimum cathode current, and stable operation across –40°C to 85°C - used for high-accuracy ADC/DAC biasing and sensor excitation in industrial analog input modules.
For engineers reviewing the LM4040C30IDBZT datasheet, LM4040C30IDBZT pinout, LM4040C30IDBZT application, or LM4040C30IDBZT equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and noise performance, and real-world application context for precision analog system design.
Technical Context
The LM4040C30IDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 3.0V reverse breakdown voltage (VZ) at the cathode terminal relative to anode ground. Its Zener-zap trimmed silicon junction ensures tight initial tolerance and low thermal drift without requiring external capacitors.
It achieves low dynamic impedance (0.4Ω typical at 1mA), supports wide operating current (45μA–15mA), and maintains stability with all capacitive loads - enabling direct integration into low-power, space-constrained signal chains where supply headroom is limited and layout simplicity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal at IZ = 100μA; fixed value enables predictable biasing of ADC references and op-amp circuits |
| Initial Accuracy | ±0.5% max at 25°C; defines worst-case DC offset in calibration-critical systems like field transmitters |
| Temp Coefficient | 100ppm/°C max over –40°C to 85°C; contributes ≤±0.03V drift across full industrial range |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered sensor nodes |
| Output Noise | 35μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data acquisition front-ends |
| Dynamic Impedance | 0.4Ω typical at 1mA; minimizes load-induced voltage variation during fast-sampling cycles |
| Long-Term Stability | 120ppm after 1000h; ensures calibration integrity over multi-year equipment lifetimes |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient, compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connects to regulated node; sinks current to maintain 3.0V reference potential |
| Anode (Pin 2) | Common ground reference | Must be connected to system ground; serves as return path for cathode current |
| NC (Pin 3) | No internal connection | Left floating per TI recommendation; no electrical function or routing required |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and PCB area in compact analog designs |
| Low 35μVRMS noise | Enables high-resolution measurements without additional filtering in precision DAQ systems |
| Wide 45μA–15mA operating current | Supports both ultra-low-power sleep modes and high-speed sampling bursts in same design |
| –40°C to 85°C operation | Validated for industrial ambient environments including factory automation and energy metering |
| Fuse/Zener-zap trimming | Ensures consistent 3.0V output and ±0.5% tolerance across production lots without post-package adjustment |
Applications
| Industrial Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: Signal conditioning stage in modular PLC analog I/O cards handling 4–20mA and 0–10V inputs. IC Role / Device Role / Timing Role: Provides stable 3.0V reference for 24-bit delta-sigma ADC and programmable gain amplifier biasing. Use Value: Enables <±0.01% total unadjusted error (TUE) across temperature and time via low drift and noise. | Use Scenario: High-channel-count portable DAQ unit for vibration monitoring in predictive maintenance. IC Role / Device Role / Timing Role: Supplies reference voltage to multiplexed SAR ADCs and anti-aliasing filter op-amps. Use Value: Maintains 16-bit ENOB at 100kSPS by limiting reference-induced noise contribution to <0.5 LSB. |
| Field Transmitter | Energy Infrastructure Monitoring |
Use Scenario: Two-wire 4–20mA smart transmitter with HART communication in hazardous areas. IC Role / Device Role / Timing Role: Sets precise current loop compliance voltage and powers internal signal chain from loop power. Use Value: Ensures <±0.1% span error over –40°C to 70°C ambient, meeting IEC 61293 Class 0.1 requirements. | Use Scenario: Revenue-grade electricity meter with metrology ASIC and isolation barrier. IC Role / Device Role / Timing Role: References metrology ADC and provides bias for isolated voltage sensing circuitry. Use Value: Contributes <±20ppm/year long-term drift, supporting 10-year calibration intervals per ANSI C12.20. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C30IDBZR | Same 3.0V output, ±0.5% grade, but uses bandgap architecture; higher 60μVRMS noise; 60μA min IZ | Less suitable for sub-16-bit noise-sensitive DAQ; better for cost-sensitive industrial controls | Select when lower cost outweighs noise and current requirements |
| REF3030AIDBZR | 3.0V series reference; requires external bypass cap; 50μA IQ; 25μVRMS noise; 100ppm/°C TC | Needs higher supply headroom (>3.3V); unsuitable for two-terminal shunt topologies | Choose only if system has dedicated 3.3V rail and layout allows series reference placement |
Compared with TL4050C30IDBZR and REF3030AIDBZR, the LM4040C30IDBZT uniquely combines true two-terminal operation, lowest noise in its class, and minimal current demand - making it optimal for space- and power-constrained shunt-based precision analog systems.
Availability
LM4040C30IDBZT is available at Aetrix Electronics and suitable for industrial analog input modules, field transmitters, energy infrastructure monitoring, and portable data-acquisition systems requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040C30IDBZT 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, embedded processing, and power management technologies with over 90 years of innovation in precision analog components.
The LM4040 family was designed specifically for high-accuracy, low-power shunt reference applications in industrial, automotive, and instrumentation systems - prioritizing stability, noise performance, and ease of use in constrained layouts.
FAQ
What is the maximum operating temperature range for the LM4040C30IDBZT?
The LM4040C30IDBZT is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per TI's LM4040CxxxI specification table and supports deployment in factory automation, energy meters, and outdoor sensor enclosures without derating.
Does the LM4040C30IDBZT require an output capacitor for stability?
No, the LM4040C30IDBZT is inherently stable with all capacitive loads and does not require an output capacitor. This is confirmed in the device description and "Features" section of the TI datasheet, simplifying layout and reducing component count in space-sensitive designs.
What is the typical cathode current range for normal operation of the LM4040C30IDBZT?
The LM4040C30IDBZT operates reliably from 45μA (typical minimum) up to 15mA cathode current. This wide range is specified in Section 6.3 (Recommended Operating Conditions) and enables flexible biasing in both ultra-low-power and high-precision configurations.
How does the LM4040C30IDBZT achieve its ±0.5% initial accuracy?
The LM4040C30IDBZT achieves ±0.5% initial accuracy at 25°C through wafer-level fuse and Zener-zap reverse breakdown voltage trimming, as documented in the "Description" section. This process ensures consistent 3.0V output across production lots without post-packaging calibration.
Can the LM4040C30IDBZT be used in automotive applications?
The LM4040C30IDBZT is rated for –40°C to +85°C and is not AEC-Q200 qualified. For automotive applications requiring extended temperature or qualification, TI offers the LM4040C30Q variant (–40°C to +125°C) - the LM4040C30IDBZT itself is intended for industrial, not automotive, use cases.
LM4040C30IDBZT 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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 82 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C30IDBZT FAQ
1.How can I place an order for LM4040C30IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C30IDBZT 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 LM4040C30IDBZT reliable?
The price and inventory of LM4040C30IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C30IDBZT is usually 5 days.
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LM4040C30IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C30IDBZT 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 LM4040C30IDBZT?
For technical support, including LM4040C30IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C30IDBZT requirements.
6.How does Aetrix verify that LM4040C30IDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040C30IDBZT 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 LM4040C30IDBZT meets industry standards.
7.What is the process for return or replacement of LM4040C30IDBZT?
All LM4040C30IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C30IDBZT, 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 LM4040C30IDBZT part is unused and in its original packaging.
Return procedure for LM4040C30IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C30IDBZT 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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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
Diodes Incorporated
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