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Texas Instruments LM4040C20QDBZTG4
- Part No.:
- LM4040C20QDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C20QDBZTG4.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,324
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Product details
Overview
LM4040C20QDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference with 2.048V nominal output, ±10mV (±0.5%) initial tolerance at 25°C, 100ppm/°C temperature coefficient, and operation across –40°C to 125°C. It delivers stable regulation for high-accuracy ADC/DAC biasing in industrial sensor signal chains.
For engineers reviewing the LM4040C20QDBZTG4 datasheet, LM4040C20QDBZTG4 pinout, LM4040C20QDBZTG4 application, or LM4040C20QDBZTG4 equivalent, key selection criteria include extended-temperature-grade shunt reference performance, low 35μVRMS noise, 45μA minimum cathode current, and SOT-23-3 package compatibility with space-constrained analog front-ends.
Technical Context
The LM4040C20QDBZTG4 functions as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.048V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves 0.5% initial accuracy and 100ppm/°C drift over –40°C to 125°C without external capacitors.
It operates with cathode current from 45μA to 15mA, exhibits 0.9Ω typical dynamic impedance at 1mA, and maintains 35μVRMS wideband noise (10Hz–10kHz) - enabling use in low-power, high-resolution data acquisition where supply headroom is limited and noise sensitivity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; enables direct interface with 12-bit ADCs using VREF = VDD/2 or binary-scaled references. |
| Initial Tolerance | ±10mV (±0.5%) at 25°C; supports <0.5% system-level voltage error budgets without trimming. |
| Temp Coefficient | 100ppm/°C max over –40°C to 125°C; contributes ≤±100mV drift across full range, critical for field-deployed sensors. |
| Min Cathode Current | 45μA typical; allows operation from ultra-low-power sources such as energy-harvesting circuits or battery-backed systems. |
| Output Noise | 35μVRMS (10Hz–10kHz); minimizes quantization uncertainty in 16-bit+ SAR and delta-sigma converters. |
| Dynamic Impedance | 0.9Ω typical at 1mA; ensures <1mV load regulation shift under 1mA current transients in precision analog stages. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to regulated rail; sinks all excess current to hold VZ = 2.048V - requires series resistor from supply. |
| Anode (Pin 2) | Reference ground / common return | Must be connected to system ground; defines 0V reference for output voltage measurement. |
| NC (Pin 3) | No internal connection | Float or tie to anode per EMI guidance; no electrical function - avoids unintended coupling in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies layout and reduces BOM count in compact sensor modules. |
| Extended temperature grade | Specified from –40°C to 125°C - qualified for under-hood automotive, motor control, and industrial process monitoring. |
| Low micropower operation | 45μA minimum cathode current enables >10-year battery life in wireless sensor nodes with intermittent wake-up cycles. |
| Tight long-term stability | 120ppm drift after 1000 hours - ensures calibration integrity over product lifetime without field recalibration. |
Applications
| Data-Acquisition Systems | Energy Infrastructure |
|---|---|
Use Scenario: High-resolution 16-bit SAR ADC front-end in portable multimeters and power quality analyzers. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC full-scale range, directly matching binary-weighted DAC codes. Use Value: Enables ±0.5 LSB integral nonlinearity by limiting reference drift to <1mV over temperature and time. | Use Scenario: Voltage sensing in solar inverter DC-link monitoring and battery management systems. IC Role / Device Role / Timing Role: Shunt reference for isolated amplifier biasing in high-voltage differential sensing circuits. Use Value: Maintains <0.1% measurement accuracy across –40°C to 125°C ambient, meeting IEC 62109 safety compliance margins. |
| Analog Input Module | Field Transmitters |
Use Scenario: 4–20mA loop-powered analog input cards in PLC backplanes. IC Role / Device Role / Timing Role: Precision reference for programmable gain instrumentation amplifiers and sigma-delta ADC drivers. Use Value: Supports 14-bit effective resolution with <35μVRMS noise floor, eliminating post-conversion digital filtering overhead. | Use Scenario: Two-wire 4–20mA smart pressure/temperature transmitters in oil & gas upstream equipment. IC Role / Device Role / Timing Role: Stable excitation source for bridge sensors and reference for HART modem biasing. Use Value: Guarantees <±0.5% total error over 15-year field deployment due to 120ppm long-term drift spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C20IDBZR | Same 2.048V/±0.5%/100ppm/°C specs but rated for –40°C to 85°C only; SOT-23-3 package. | Not suitable for under-hood or high-ambient industrial enclosures exceeding 85°C. | Select LM4040C20IDBZR only when operating ambient stays ≤85°C and cost optimization is prioritized. |
| MAX6008AEUR+T | 2.048V output, ±0.2% initial accuracy, 75ppm/°C TC, but requires ≥60μA min cathode current and has higher 50μVRMS noise. | Better accuracy but higher power and noise - trade-off for ultra-low-drift vs. ultra-low-power designs. | Choose MAX6008AEUR+T when tighter initial tolerance outweighs micropower and noise requirements. |
Compared with LM4040C20IDBZR, LM4040C20QDBZTG4 adds 40°C higher max operating temperature at identical accuracy and noise; versus MAX6008AEUR+T, it trades 0.3% less initial tolerance for 15μVRMS lower noise and 15μA lower minimum current - optimizing for battery longevity and resolution in harsh environments.
Availability
LM4040C20QDBZTG4 is available at Aetrix Electronics and suitable for data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040C20QDBZTG4 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 and embedded processing solutions, with deep expertise in precision analog ICs and industrial-grade reliability.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in industrial automation, test equipment, and sensor signal conditioning - emphasizing robustness, minimal external components, and extended-temperature operation.
FAQ
What is the maximum operating temperature of the LM4040C20QDBZTG4?
The LM4040C20QDBZTG4 is characterized for continuous operation from –40°C to +125°C ambient temperature. This extended temperature rating is confirmed in Section 4 (Device Comparison Table) and Section 6.7 (Electrical Characteristics) of the TI datasheet SLOS456Q, making it suitable for under-hood automotive and industrial motor control applications where thermal stress exceeds standard industrial grade limits.
Does the LM4040C20QDBZTG4 require an output capacitor?
No, the LM4040C20QDBZTG4 is stable with all capacitive loads and does not require an output capacitor for operation. This is explicitly stated in the "Features" section and verified in the "Description" and "Detailed Description" sections of the TI datasheet. The device's inherent stability eliminates capacitor-related aging, leakage, and layout sensitivity - reducing bill-of-materials and improving long-term reliability in sealed sensor housings.
What is the minimum cathode current needed for regulation in the LM4040C20QDBZTG4?
The LM4040C20QDBZTG4 requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation, as specified in Section 6.7 of the TI datasheet. At full temperature range (–40°C to 125°C), the guaranteed minimum is 80μA. This ultra-low current enables integration into energy-harvesting systems and battery-powered IoT edge nodes where quiescent power must remain below 100μW.
How does the LM4040C20QDBZTG4 compare to the LM4040C20IDBZR?
The LM4040C20QDBZTG4 and LM4040C20IDBZR share identical electrical specifications (2.048V, ±0.5%, 100ppm/°C, 35μVRMS noise) and SOT-23-3 packaging, but differ in temperature rating: LM4040C20QDBZTG4 is qualified for –40°C to 125°C, while LM4040C20IDBZR is rated only to 85°C. The 'Q' suffix denotes automotive/extended-temp qualification per TI's ordering nomenclature, validated by accelerated life testing and wider parametric characterization.
What is the thermal hysteresis specification for the LM4040C20QDBZTG4?
The LM4040C20QDBZTG4 has a thermal hysteresis of 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to +125°C. This value is explicitly listed in Tables 6.6 and 6.7 of the TI datasheet and reflects minimal memory effect during thermal cycling - critical for field instruments that undergo repeated ambient temperature swings without recalibration.
LM4040C20QDBZTG4 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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- 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:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C20QDBZTG4 FAQ
1.How can I place an order for LM4040C20QDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C20QDBZTG4 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 LM4040C20QDBZTG4 reliable?
The price and inventory of LM4040C20QDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C20QDBZTG4 is usually 5 days.
3.What payment methods are accepted for LM4040C20QDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C20QDBZTG4 transactions.
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4.How is shipping managed for LM4040C20QDBZTG4?
LM4040C20QDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C20QDBZTG4 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 LM4040C20QDBZTG4?
For technical support, including LM4040C20QDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C20QDBZTG4 requirements.
6.How does Aetrix verify that LM4040C20QDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040C20QDBZTG4 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 LM4040C20QDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040C20QDBZTG4?
All LM4040C20QDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C20QDBZTG4, 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 LM4040C20QDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040C20QDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C20QDBZTG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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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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