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Texas Instruments LM4040D50QDBZT
- Part No.:
- LM4040D50QDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D50QDBZT.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
LM4040D50QDBZT from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 5.0V output with ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from –40°C to 125°C. It requires no external capacitor and supports cathode currents from 45μA to 15mA, making it suitable for high-accuracy analog input modules in industrial field transmitters.
For engineers reviewing the LM4040D50QDBZT datasheet, LM4040D50QDBZT pinout, LM4040D50QDBZT application, or LM4040D50QDBZT equivalent, key selection criteria include extended-temperature-grade shunt reference performance, low-noise stability under capacitive loads, tight initial tolerance at 5V, and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4040D50QDBZT operates as a two-terminal shunt reference, sinking current through its cathode to maintain a precise 5.0V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves D-grade accuracy (±1.0% at 25°C) and 150ppm/°C tempco over –40°C to 125°C, with dynamic impedance of ≤1.1Ω at 1mA.
It functions without output capacitance, remains stable with all capacitive loads, and features low 35μVRMS noise (10Hz–10kHz) and thermal hysteresis of 0.08%. Minimum cathode current is 45μA typical, enabling use in ultra-low-power sensor signal conditioning and battery-backed data acquisition systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V nominal; enables direct biasing of 5V ADC references and op-amp precision gain stages |
| Initial Accuracy | ±1.0% at 25°C (D grade); defines maximum offset error in calibration-critical measurement circuits |
| Tempco | 150ppm/°C max; contributes ≤±0.25% voltage drift over full –40°C to 125°C operating range |
| Noise | 35μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data converters without additional filtering |
| Cathode Current Range | 45μA to 15mA; supports both micropower sensor interfaces and higher-current reference buffering |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures minimal load regulation error when driving varying downstream impedances |
| Operating Temperature | –40°C to 125°C; qualified for under-hood automotive and industrial control environments |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input | Current sink node; connects to supply rail via series resistor to establish regulated 5V at anode |
| Anode (Pin 2) | Common reference node | Ground-referenced output terminal; voltage measured between anode and cathode is 5.0V |
| NC (Pin 3) | No internal connection | Unused terminal; must be left floating or tied to anode only in high-EMI environments per TI guidance |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Eliminates BOM cost and layout area for stabilization caps; simplifies design for portable and space-limited systems |
| Stability with all capacitive loads | Prevents oscillation when driving ADC input capacitance or long PCB traces without compensation networks |
| Low 35μVRMS noise | Reduces RMS error contribution in precision 16-bit+ SAR and delta-sigma ADC applications |
| Extended temperature qualification | Validated operation from –40°C to 125°C supports automotive engine control and industrial motor drive designs |
| Micropower minimum current | 45μA typical start-up current enables use in always-on sensor nodes powered by energy harvesters or coin cells |
Applications
| Industrial Field Transmitter | Energy Infrastructure Metering |
|---|---|
Use Scenario: 4–20mA loop-powered transmitter conditioning sensor signals before analog-to-digital conversion. IC Role / Device Role / Timing Role: Shunt reference providing stable 5.0V excitation and ADC reference for pressure/temperature sensing. Use Value: ±1.0% initial accuracy and 150ppm/°C tempco ensure <0.5% total error over full industrial temperature range without recalibration. | Use Scenario: Polyphase electricity meter requiring high-accuracy voltage scaling for current-sense amplifiers and metrology ADCs. IC Role / Device Role / Timing Role: Precision 5V reference for anti-aliasing filter biasing and ADC reference voltage generation. Use Value: 35μVRMS noise prevents degradation of >100dB SNR in Class 0.2 metering ICs; stable with metering ASIC input capacitance. |
| Analog Input Module | Automotive Battery Monitoring |
Use Scenario: Modular PLC I/O card digitizing multiple 0–10V industrial sensor inputs using multiplexed 16-bit ADCs. IC Role / Device Role / Timing Role: Shared 5V reference for programmable gain instrumentation amplifiers and ADC reference. Use Value: Low dynamic impedance (≤1.1Ω) minimizes crosstalk-induced errors during channel switching and maintains linearity across 16-bit resolution. | Use Scenario: High-voltage battery pack monitor in EVs measuring cell voltages across 100+ series-connected Li-ion cells. IC Role / Device Role / Timing Role: Local 5V reference for isolated ADCs and voltage dividers in distributed monitoring units. Use Value: Extended –40°C to 125°C rating ensures reliable reference performance inside battery enclosures exposed to thermal cycling and under-hood ambient extremes. |
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% initial accuracy (C grade), 75ppm/°C tempco, SOT-23-3 package | Higher accuracy and lower tempco; suited for applications requiring tighter long-term stability | Select when system-level accuracy budget demands <±0.5% initial error and <100ppm/°C drift |
| MAX6008AEUR+T | 5.0V output, ±0.2% initial accuracy (A grade), 50ppm/°C tempco, SOT-23-3 package, 20μVRMS noise | Lower noise and superior tempco; requires 60μA min cathode current | Choose for ultra-low-noise metrology or high-resolution data acquisition where 20μVRMS noise is critical |
Compared with TL4050C50IDBZR and MAX6008AEUR+T, the LM4040D50QDBZT trades initial accuracy and noise performance for cost-effective D-grade tolerance and proven robustness in harsh-temperature industrial deployments, while maintaining identical SOT-23-3 footprint and cathode-anode topology.
Availability
LM4040D50QDBZT is available at Aetrix Electronics and suitable for industrial field transmitters, energy infrastructure metering, and automotive battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040D50QDBZT 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 automotive/industrial qualification.
The LM4040 series was developed to deliver cost-optimized, micropower shunt references for space-constrained, high-accuracy analog signal chains - particularly in industrial automation, test equipment, and automotive subsystems demanding extended temperature operation.
FAQ
What is the maximum operating temperature for the LM4040D50QDBZT?
The LM4040D50QDBZT is characterized for continuous operation from –40°C to +125°C ambient temperature, meeting extended-temperature requirements for under-hood automotive and industrial control applications. This rating is explicitly defined in the device's Q-grade specification and confirmed in Section 6.3 (Recommended Operating Conditions) of the TI datasheet.
Does the LM4040D50QDBZT require an external output capacitor?
No, the LM4040D50QDBZT does not require an external output capacitor. Its internal design ensures stability with all capacitive loads, including direct connection to ADC input capacitance or long PCB traces. This eliminates BOM cost and layout complexity - a key feature confirmed in the "Features" and "Description" sections of the official TI datasheet.
What is the minimum cathode current needed for regulation in the LM4040D50QDBZT?
The LM4040D50QDBZT requires a minimum cathode current of 45μA (typical) to maintain regulation at 5.0V. This value is specified in Table 6.18 (LM4040C50Q, LM4040D50Q Electrical Characteristics) and enables use in ultra-low-power applications such as battery-backed sensors and energy-harvesting systems.
How does the noise performance of the LM4040D50QDBZT impact precision ADC designs?
The LM4040D50QDBZT delivers 35μVRMS wideband noise (10Hz–10kHz), directly contributing to reference-related noise in precision ADCs. For a 16-bit 5V-full-scale SAR ADC, this adds ~0.11 LSB RMS noise - a quantifiable error term that must be included in total system SNR budgets, especially in metrology-grade energy meters or high-fidelity sensor interfaces.
Is the LM4040D50QDBZT pin-compatible with other LM4040 variants in SOT-23-3?
Yes, the LM4040D50QDBZT uses the standard DBZ (SOT-23-3) package with identical pinout - Cathode (Pin 1), Anode (Pin 2), NC (Pin 3) - as all other LM4040x50x DBZ variants. This allows direct substitution within the same 5.0V family (e.g., LM4040C50QDBZT, LM4040B50QDBZT) without PCB changes, provided system-level accuracy and tempco requirements are verified.
LM4040D50QDBZT 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°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
LM4040D50QDBZT FAQ
1.How can I place an order for LM4040D50QDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D50QDBZT 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 LM4040D50QDBZT reliable?
The price and inventory of LM4040D50QDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D50QDBZT is usually 5 days.
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LM4040D50QDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D50QDBZT 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 LM4040D50QDBZT?
For technical support, including LM4040D50QDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D50QDBZT requirements.
6.How does Aetrix verify that LM4040D50QDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040D50QDBZT 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 LM4040D50QDBZT meets industry standards.
7.What is the process for return or replacement of LM4040D50QDBZT?
All LM4040D50QDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D50QDBZT, 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 LM4040D50QDBZT part is unused and in its original packaging.
Return procedure for LM4040D50QDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D50QDBZT Tags
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TL431AIDBZR
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TL431BQDBZR
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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
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