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Texas Instruments LM4040D20QDBZTG4
- Part No.:
- LM4040D20QDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D20QDBZTG4.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,882
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Product details
Overview
LM4040D20QDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.048V output with ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from –40°C to 125°C in SOT-23-3 package. It serves as a low-drift, low-noise reference for high-resolution ADCs and DACs in industrial sensor signal chains.
For engineers reviewing the LM4040D20QDBZTG4 datasheet, LM4040D20QDBZTG4 pinout, LM4040D20QDBZTG4 application, or LM4040D20QDBZTG4 equivalent, key selection criteria include extended-temperature-grade shunt reference stability, cathode current range (45μA–15mA), dynamic impedance (<1.1Ω), and compatibility with all capacitive loads without external compensation.
Technical Context
The LM4040D20QDBZTG4 operates 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 D-grade tolerance (±1.0% at 25°C) and supports full-range operation up to 125°C ambient.
It exhibits low dynamic impedance (≤1.1Ω at 1mA), minimal voltage drift versus cathode current (≤10mV over 1mA–15mA), and thermal hysteresis of only 0.08% - enabling stable performance in cyclic thermal environments such as automotive engine control units and field transmitters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; enables exact 12-bit full-scale scaling (e.g., 2.048V / 4096 = 0.5mV per LSB) |
| Initial Accuracy | ±1.0% at 25°C (D grade); corresponds to ±20.5mV absolute error at 2.048V |
| Temp Coefficient | 150ppm/°C max; contributes ≤307μV/°C drift over operating range |
| Noise (10Hz–10kHz) | 35μVRMS typical; preserves SNR in 16-bit+ data acquisition systems |
| Cathode Current Range | 45μA to 15mA; supports ultra-low-power sensor biasing and high-current reference buffering |
| Dynamic Impedance | ≤1.1Ω at 1mA; minimizes load-induced voltage shift in varying current conditions |
| Operating Temp | –40°C to +125°C; qualified for under-hood automotive and industrial control applications |
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 input | Connects to regulated supply rail; sinks all reference current plus load current |
| Anode (Pin 2) | Common reference node | Typically tied to system ground; defines 0V reference point for output voltage |
| NC (Pin 3) | No internal connection | Must float or be connected to anode per EMI mitigation guidance in high-noise environments |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies layout and reduces BOM count |
| Low 45μA minimum cathode current | Enables use in battery-powered devices with multi-year runtime (e.g., wireless sensors) |
| 125°C extended temperature rating | Supports placement near heat sources (e.g., power converters, motor drivers) without derating |
| 1000-hour long-term stability | 120ppm drift ensures calibration integrity over product lifetime in test equipment |
| ESD robustness | ±2000V HBM rating protects against handling damage during assembly and field service |
Applications
| High-Resolution Data Acquisition | Industrial Field Transmitter |
|---|---|
Use Scenario: 24-bit sigma-delta ADC in programmable logic controller analog input module. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC full-scale calibration and ratiometric sensor excitation. Use Value: Enables <1 LSB INL error over –40°C to 85°C due to tight tempco and low noise. | Use Scenario: 4–20mA loop-powered temperature transmitter with HART communication. IC Role / Device Role / Timing Role: Supplies precision bias voltage for RTD bridge and instrumentation amplifier. Use Value: Maintains 0.1% measurement accuracy across full industrial temperature range (–40°C to 125°C). |
| Automotive Engine Control Unit | Energy Infrastructure Monitoring |
Use Scenario: Cylinder pressure sensing in gasoline direct injection engine management system. IC Role / Device Role / Timing Role: References piezoelectric sensor signal conditioning chain in high-EMI under-hood environment. Use Value: NC pin grounding option suppresses switching noise coupling, preserving signal fidelity. | Use Scenario: DC bus voltage monitoring in solar inverter string-level power optimizers. IC Role / Device Role / Timing Role: Sets accurate threshold for overvoltage protection comparator and ADC sampling. Use Value: ±2.5% total error budget (initial + tempco + hysteresis) meets IEC 62109 safety compliance margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C20IDBZR | Same 2.048V output, ±0.5% initial accuracy (C grade), 100ppm/°C tempco, SOT-23-3 | Better accuracy/tempco but rated only to 85°C ambient | Select when operating temperature stays ≤85°C and tighter initial tolerance is required |
| MAX6008AEUR+T | 2.048V output, ±0.2% initial accuracy, 75ppm/°C tempco, SC70-3 package | Lower noise (20μVRMS), smaller SC70 footprint, but max 85°C rating and higher min current (60μA) | Choose for space-constrained, low-noise portable designs where extended temperature is not needed |
Compared with TL4050C20IDBZR and MAX6008AEUR+T, the LM4040D20QDBZTG4 trades initial accuracy and noise for guaranteed 125°C operation and ultra-low 45μA minimum cathode current - making it optimal for harsh-environment, energy-harvesting, or thermally demanding applications.
Availability
LM4040D20QDBZTG4 is available at Aetrix Electronics and suitable for high-reliability industrial control, automotive electronics, and energy infrastructure monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040D20QDBZTG4 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 to deliver cost-effective, space-efficient shunt references for portable, industrial, and automotive systems requiring stable voltage references without external components.
FAQ
What is the maximum operating temperature for LM4040D20QDBZTG4?
The LM4040D20QDBZTG4 is characterized for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive and industrial environments where thermal stress exceeds standard commercial-grade limits. This rating is confirmed in Section 6.7 of the TI datasheet SLOS456Q.
Does LM4040D20QDBZTG4 require an output capacitor?
No, the LM4040D20QDBZTG4 is inherently stable with all capacitive loads and requires no output capacitor - a key advantage over many series references. This eliminates capacitor-related aging, leakage, and board space concerns, as explicitly stated in the "Features" section of the datasheet.
What is the minimum cathode current needed for regulation in LM4040D20QDBZTG4?
The LM4040D20QDBZTG4 regulates stably with a minimum cathode current of 45μA (typical) at 25°C, rising to 80μA across the full –40°C to 125°C range. This ultra-low requirement enables use in micropower applications such as battery-backed sensors and energy-harvesting nodes.
How does the NC pin (Pin 3) function in LM4040D20QDBZTG4?
Pin 3 of the LM4040D20QDBZTG4 is a no-connect terminal with no internal bond. TI recommends leaving it floating or connecting it to the anode (Pin 2) in high-EMI environments - such as near switching power supplies or motor drivers - to reduce noise coupling into the reference node.
Is LM4040D20QDBZTG4 compatible with lead-free reflow processes?
Yes, the LM4040D20QDBZTG4 in SOT-23-3 (DBZ) package is RoHS-compliant and qualified for standard lead-free reflow profiles per JEDEC J-STD-020, including peak temperatures up to 260°C. The device's thermal metrics (RθJA = 206°C/W) support reliable thermal performance post-reflow.
LM4040D20QDBZTG4 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D20QDBZTG4 FAQ
1.How can I place an order for LM4040D20QDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D20QDBZTG4 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 LM4040D20QDBZTG4 reliable?
The price and inventory of LM4040D20QDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D20QDBZTG4 is usually 5 days.
3.What payment methods are accepted for LM4040D20QDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D20QDBZTG4 transactions.
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4.How is shipping managed for LM4040D20QDBZTG4?
LM4040D20QDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D20QDBZTG4 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 LM4040D20QDBZTG4?
For technical support, including LM4040D20QDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D20QDBZTG4 requirements.
6.How does Aetrix verify that LM4040D20QDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040D20QDBZTG4 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 LM4040D20QDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040D20QDBZTG4?
All LM4040D20QDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D20QDBZTG4, 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 LM4040D20QDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040D20QDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D20QDBZTG4 Tags
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