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Texas Instruments LM4040C50QDBZT
- Part No.:
- LM4040C50QDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C50QDBZT.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,318
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Product details
Overview
LM4040C50QDBZT 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 operation across –40°C to 125°C. It serves as a stable voltage reference in high-accuracy analog signal chains for industrial sensors and data-acquisition systems.
For engineers reviewing the LM4040C50QDBZT datasheet, LM4040C50QDBZT pinout, LM4040C50QDBZT application, or LM4040C50QDBZT equivalent, this page delivers verified specifications, package mapping, thermal performance data, and real-world implementation context for design-in and qualification.
Technical Context
The LM4040C50QDBZT operates as a two-terminal shunt reference requiring no external capacitors and remains stable with all capacitive loads. Its Zener-zap trimmed reverse breakdown voltage ensures tight initial tolerance, while low dynamic impedance (≤0.9Ω at 1mA) and low noise support high-resolution ADC biasing and sensor excitation circuits.
Designed for extended temperature operation, it maintains specified performance over –40°C to 125°C ambient, with thermal hysteresis of 0.08% and long-term stability of 120ppm after 1000 hours. The C-grade variant balances cost and precision for industrial-grade instrumentation where A/B-grade accuracy is unnecessary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V nominal at IZ = 100μA; enables direct interface with 5V ADC references and microcontroller VREF inputs. |
| Initial Accuracy | ±0.5% max at 25°C; supports 12-bit system accuracy without calibration in industrial sensor front-ends. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±0.5% error over full –40°C to 125°C range, critical for unheated field transmitters. |
| Operating Current | 45μA typical minimum cathode current; allows ultra-low-power operation in battery-backed monitoring nodes. |
| Output Noise | 35μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data acquisition systems without added filtering. |
| Dynamic Impedance | 0.9Ω max at 1mA; minimizes load-induced voltage shift during fast-sampling ADC conversions. |
| Thermal Hysteresis | 0.08%; ensures repeatable voltage after thermal cycling-key for recalibration-free field instruments. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connected to supply rail; sinks current to regulate voltage at anode node. |
| Anode (Pin 2) | Common ground reference | Typically tied to system ground; defines reference potential for output voltage. |
| NC (Pin 3) | No internal connection | Must float or connect to anode per TI recommendation in EMI-sensitive environments. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor-reduces BOM count and layout sensitivity in space-constrained modules. |
| Wide operating current range | 45μA to 15mA operation enables use in both ultra-low-power sleep modes and high-speed sampling bursts. |
| Extended temperature rating | –40°C to 125°C operation supports under-hood automotive and outdoor energy infrastructure deployments. |
| Low dynamic impedance | ≤0.9Ω ensures minimal voltage droop during transient load steps in precision DAC buffer circuits. |
| Fuse/Zener-zap trimming | Enables 0.5% initial tolerance without post-package adjustment-improves production yield and consistency. |
Applications
| Industrial Sensor Transmitter | Portable Data Logger |
|---|---|
Use Scenario: 4–20mA loop-powered field transmitter conditioning thermocouple or RTD signals. IC Role / Device Role / Timing Role: Provides stable 5.0V reference for signal conditioning amplifier gain-setting and ADC conversion. Use Value: ±0.5% initial accuracy and 100ppm/°C drift ensure <12-bit linearity over temperature without recalibration. |
Use Scenario: Battery-operated environmental monitor logging temperature/humidity at 1-minute intervals. IC Role / Device Role / Timing Role: Supplies reference voltage to 16-bit SAR ADC during brief active measurement windows. Use Value: 45μA min cathode current enables operation down to 2.7V supply with >1-year battery life. |
| Energy Meter Front-End | Automotive Cabin Sensor Module |
Use Scenario: Polyphase electricity meter measuring voltage/current with metrology-grade accuracy. IC Role / Device Role / Timing Role: References high-resolution delta-sigma ADCs for voltage channel scaling. Use Value: 35μVRMS noise prevents degradation of >100dB SNR required for Class 0.2 meter certification. |
Use Scenario: Occupancy and air quality sensor cluster mounted near HVAC ducts in vehicle cabin. IC Role / Device Role / Timing Role: Supplies stable reference to analog front-end amplifiers and humidity ICs. Use Value: –40°C to 125°C rating ensures reliable operation across parked-in-sun and cold-start conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C50IDBZR | Same electrical specs; SOT-23-3 package but industrial temp range (–40°C to 85°C) vs. LM4040C50QDBZT's extended range. | Not suitable for under-hood or outdoor enclosures exceeding 85°C ambient. | Select LM4040C50QDBZT when operation above 85°C is required; otherwise LM4040C50IDBZR offers lower cost. |
| ADR3450ARJZ-R7 | 5.0V output, ±0.1% initial accuracy, 30ppm/°C TC, but requires ≥100μA min current and has higher 10μVRMS noise. | Better accuracy/noise but incompatible with ultra-low-current designs; different pinout (SOT-23-5). | Choose ADR3450ARJZ-R7 only when sub-0.1% accuracy and lower TC outweigh current budget constraints. |
Compared with LM4040C50IDBZR, LM4040C50QDBZT adds 40°C higher max operating temperature at same accuracy and noise; compared with ADR3450ARJZ-R7, it trades 0.4% accuracy and higher TC for 2× lower minimum current and proven robustness in high-capacitance sensor interfaces.
Availability
LM4040C50QDBZT is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable data loggers, energy meter front-ends, and automotive cabin sensor modules requiring stable component supply across extended temperature ranges.
Supply support for LM4040C50QDBZT 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.
The LM4040 series was developed for cost-sensitive, high-reliability applications demanding micropower operation, wide temperature support, and capacitor-free stability-targeting industrial automation, energy infrastructure, and automotive subsystems.
FAQ
What is the maximum operating temperature for LM4040C50QDBZT?
The LM4040C50QDBZT is characterized for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive and outdoor industrial deployments where standard industrial-grade references fail. This extended range is confirmed in Section 4 (Device Comparison Table) and Section 6.18 (Electrical Characteristics) of the TI datasheet SLOS456Q.
Does LM4040C50QDBZT require an output capacitor?
No, LM4040C50QDBZT is stable with all capacitive loads and does not require an output capacitor-this is explicitly stated in the Features section and validated in the Description and Applications sections of the TI datasheet. Eliminating the capacitor reduces component count and improves reliability in high-vibration environments.
What is the minimum cathode current needed for LM4040C50QDBZT regulation?
The LM4040C50QDBZT requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation, as specified in Table 6.17 and 6.18 of the TI datasheet. At full temperature range (–40°C to 125°C), the guaranteed minimum is 80μA-critical for ultra-low-power battery applications.
How does the 100ppm/°C temperature coefficient affect system accuracy?
With a 100ppm/°C coefficient, LM4040C50QDBZT contributes up to ±0.5% voltage error over its full –40°C to 125°C range (ΔT = 100°C). For a 5.0V output, that equals ±25mV drift-acceptable for 12-bit systems (LSB = 1.22mV) without compensation, as confirmed in TI's overtemperature tolerance calculations in Section 6.5 footnote (2).
Is LM4040C50QDBZT pin-compatible with other LM4040 variants in SOT-23-3?
Yes, all LM4040x50x DBZ variants-including LM4040A50QDBZT, LM4040B50QDBZT, and LM4040C50QDBZT-share identical SOT-23-3 pinout (Cathode/Anode/NC), enabling drop-in replacement within the same grade family. Pin mapping is verified in Figure 5-1 and Table 5-1 of the TI datasheet.
LM4040C50QDBZT 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C50QDBZT FAQ
1.How can I place an order for LM4040C50QDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C50QDBZT 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 LM4040C50QDBZT reliable?
The price and inventory of LM4040C50QDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C50QDBZT is usually 5 days.
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Once your LM4040C50QDBZT 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 LM4040C50QDBZT?
For technical support, including LM4040C50QDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C50QDBZT requirements.
6.How does Aetrix verify that LM4040C50QDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040C50QDBZT 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 LM4040C50QDBZT meets industry standards.
7.What is the process for return or replacement of LM4040C50QDBZT?
All LM4040C50QDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C50QDBZT, 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 LM4040C50QDBZT part is unused and in its original packaging.
Return procedure for LM4040C50QDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C50QDBZT Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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