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Texas Instruments LM4040C50IDBZR
- Part No.:
- LM4040C50IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C50IDBZR.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,934
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Product details
Overview
LM4040C50IDBZR from Texas Instruments is a precision micropower shunt voltage reference with 5.0V 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 voltage基准 in analog signal chains for industrial sensors and portable data-acquisition systems.
For engineers reviewing the LM4040C50IDBZR datasheet, LM4040C50IDBZR pinout, LM4040C50IDBZR application, or LM4040C50IDBZR equivalent, key selection criteria include its SOT-23-3 package, –40°C to 85°C operating range, no-output-capacitor requirement, and compatibility with high-impedance loads in battery-powered instrumentation.
Technical Context
The LM4040C50IDBZR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 5.0V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without external components.
It delivers low dynamic impedance (≤0.9Ω at 1mA), supports all capacitive loads without oscillation, and maintains performance over full industrial temperature range with thermal hysteresis of ≤0.08%. Long-term stability is rated at 120ppm after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V nominal at IZ = 100μA; fixed value, no adjustment required |
| Initial Accuracy | ±0.5% max at 25°C; defines absolute voltage error before temperature drift |
| Temp Coefficient | 100ppm/°C max; contributes ≤±0.065V error over –40°C to 85°C range |
| Operating Current | 45μA min to 15mA max; enables ultra-low-power and high-current use cases |
| Output Noise | 35μVRMS typical (10Hz–10kHz); critical for high-resolution ADC reference paths |
| Dynamic Impedance | 0.9Ω max at 1mA; ensures minimal load regulation error under varying current |
| Long-Term Stability | 120ppm after 1000h; quantifies aging-induced voltage drift in sealed environments |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks current to maintain 5.0V drop |
| Anode (Pin 2) | Reference ground return | Must be connected to system ground; forms voltage reference point |
| NC (Pin 3) | No internal connection | Left unconnected; no electrical function or biasing requirement |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load up to 100nF; eliminates BOM cost and layout sensitivity |
| Micropower startup | 45μA minimum cathode current enables use in energy-harvesting and coin-cell systems |
| Low-noise reference | 35μVRMS noise supports 16-bit+ SAR and delta-sigma ADC accuracy |
| Wide current range | Operates reliably from 45μA to 15mA - suitable for both sensor front-ends and DAC buffers |
| Industrial temperature range | Specified from –40°C to +85°C; qualified for factory automation and outdoor metering |
Applications
| Portable Data Loggers | Industrial Analog Input Modules |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes measuring temperature, humidity, and pressure with 16-bit ADCs. IC Role / Device Role / Timing Role: Provides stable 5.0V reference for ADC conversion and sensor excitation. Use Value: Enables <1 LSB error over temperature and battery discharge due to ±0.5% accuracy and 100ppm/°C drift. |
Use Scenario: DIN-rail mounted PLC analog input cards acquiring 4–20mA and 0–10V field signals. IC Role / Device Role / Timing Role: Serves as precision reference for programmable gain instrumentation amplifiers and sigma-delta ADCs. Use Value: Maintains calibration integrity across –40°C to 85°C ambient with <0.08% thermal hysteresis. |
| Energy Infrastructure Meters | Automotive Cabin Sensors |
Use Scenario: Smart electricity meters requiring metrology-grade voltage reference for revenue-grade energy calculation. IC Role / Device Role / Timing Role: Supplies reference for isolated ADCs measuring grid voltage and current waveforms. Use Value: Delivers 120ppm long-term stability over 10-year service life, reducing recalibration frequency. |
Use Scenario: Occupancy and air quality sensors in automotive HVAC control units. IC Role / Device Role / Timing Role: References low-power op-amps and ADCs interfacing NDIR CO₂ and VOC sensors. Use Value: Operates down to 45μA cathode current, extending battery life in always-on cabin monitoring systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C50IDBZR | Same 5.0V output, ±0.5% accuracy, but higher 50μA min cathode current and 50μVRMS noise | Less suitable for ultra-low-power designs; requires higher bias current for stability | Prefer LM4040C50IDBZR when cathode current must stay below 50μA or noise budget is <40μVRMS |
| REF3050AIDBZR | Series reference (not shunt); 5.0V output, ±0.2% accuracy, 50ppm/°C, 3.3V–5.5V supply required | Requires dedicated supply rail and cannot sink current; incompatible with shunt topology | Select LM4040C50IDBZR for simple two-terminal biasing, no supply dependency, or floating reference needs |
Compared with TL4050C50IDBZR and REF3050AIDBZR, the LM4040C50IDBZR uniquely combines ultra-low minimum current (45μA), shunt architecture, and 35μVRMS noise - making it optimal for battery-critical, two-terminal, high-precision analog front-ends where supply headroom or PCB area is constrained.
Availability
LM4040C50IDBZR is available at Aetrix Electronics and suitable for portable data loggers, industrial analog input modules, energy infrastructure meters, and automotive cabin sensors requiring stable component supply across extended production lifecycles.
Supply support for LM4040C50IDBZR 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 stable voltage references without external compensation - targeting industrial sensing, portable instrumentation, and automotive subsystems.
FAQ
What is the maximum operating temperature for LM4040C50IDBZR?
The LM4040C50IDBZR is characterized for operation from –40°C to +85°C ambient temperature. Its electrical specifications, including ±0.5% initial accuracy and 100ppm/°C temperature coefficient, are guaranteed across this full industrial range. Junction temperature must not exceed 150°C under any condition.
Does LM4040C50IDBZR require an output capacitor?
No, the LM4040C50IDBZR is stable with all capacitive loads and does not require an output capacitor for operation. This simplifies layout, reduces BOM count, and avoids potential instability issues common with other shunt references - a key advantage confirmed in TI's datasheet Section 3 and Figure 8-1.
What is the minimum cathode current needed for LM4040C50IDBZR to regulate properly?
The LM4040C50IDBZR requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation within specification. At full temperature range (–40°C to 85°C), the guaranteed minimum is 80μA. Below this, output voltage may deviate beyond ±0.5% tolerance.
How does the noise performance of LM4040C50IDBZR impact high-resolution ADC designs?
With 35μVRMS wideband noise (10Hz–10kHz), the LM4040C50IDBZR supports effective resolution up to 16 bits in SAR and delta-sigma ADC applications. For example, referenced to 5.0V full scale, this noise contributes <0.2 LSB RMS error - well within the noise floor of most 16-bit converters used in precision data acquisition.
Can LM4040C50IDBZR be used in automotive applications?
The LM4040C50IDBZR is specified for –40°C to +85°C and meets industrial reliability standards, but it is not AEC-Q200 qualified. For non-safety-critical automotive cabin sensors (e.g., HVAC air quality monitors), it is widely deployed; however, engine bay or ADAS applications require AEC-Q100-qualified alternatives like the LM4040-Q1 series.
LM4040C50IDBZR 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):
- 5V
- 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:
- 95 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C50IDBZR FAQ
1.How can I place an order for LM4040C50IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C50IDBZR 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 LM4040C50IDBZR reliable?
The price and inventory of LM4040C50IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C50IDBZR is usually 5 days.
3.What payment methods are accepted for LM4040C50IDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C50IDBZR transactions.
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LM4040C50IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C50IDBZR 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 LM4040C50IDBZR?
For technical support, including LM4040C50IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C50IDBZR requirements.
6.How does Aetrix verify that LM4040C50IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040C50IDBZR 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 LM4040C50IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040C50IDBZR?
All LM4040C50IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C50IDBZR, 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 LM4040C50IDBZR part is unused and in its original packaging.
Return procedure for LM4040C50IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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