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Texas Instruments LM4040D20IDBZTG4
- Part No.:
- LM4040D20IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D20IDBZTG4.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,938
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Product details
Overview
LM4040D20IDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.048 V output with ±1.0% initial accuracy (D grade), 150 ppm/°C temperature coefficient, 35 μVRMS wideband noise, and stable operation from 45 μA to 15 mA cathode current. It serves as a compact, capacitor-free voltage reference in analog-to-digital converter biasing, sensor signal conditioning, and portable instrumentation.
For engineers reviewing the LM4040D20IDBZTG4 datasheet, LM4040D20IDBZTG4 pinout, LM4040D20IDBZTG4 application, or LM4040D20IDBZTG4 equivalent, key selection criteria include its D-grade tolerance over –40°C to 85°C, SOT-23-3 (DBZ) package compatibility, low-noise performance at microamp-level currents, and absence of output capacitor requirement.
Technical Context
The LM4040D20IDBZTG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 2.048 V across its terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming to achieve D-grade (±1.0%) initial accuracy and supports operation without external compensation.
It exhibits low dynamic impedance (≤1.1 Ω at 1 mA), thermal hysteresis of 0.08%, and long-term stability of 120 ppm over 1000 hours - enabling reliable reference performance in battery-powered and industrial sensing circuits where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables precise 12-bit ADC full-scale alignment when used with 2.048 V input range. |
| Initial Accuracy | ±1.0% max at 25°C; defines worst-case DC offset in calibration-critical measurement front-ends. |
| Temp Coefficient | 150 ppm/°C max; contributes ≤±0.13 V drift over –40°C to 85°C ambient range. |
| Operating Current | 45 μA to 15 mA cathode current; supports ultra-low-power sensor nodes and high-current DAC references. |
| Output Noise | 35 μVRMS (10 Hz–10 kHz); limits effective resolution to ~16.5 ENOB in quiet 24-bit sigma-delta systems. |
| Dynamic Impedance | ≤1.1 Ω at 1 mA; ensures <1 mV load regulation error for ±1 mA current transients. |
| Thermal Hysteresis | 0.08%; guarantees repeatable voltage after thermal cycling between –40°C and 125°C. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm footprint, surface-mount, thermally efficient with RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connected to regulated node; sinks current to maintain 2.048 V across anode–cathode. |
| Anode (Pin 2) | Common ground reference | Typically tied to system ground; forms return path for cathode current. |
| 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 |
|---|---|
| Capacitor-free stability | Operates stably with any capacitive load; eliminates BOM cost and layout area for output capacitor. |
| Micropower operation | 45 μA minimum cathode current enables use in 10-year battery-powered IoT sensors. |
| Extended temperature range | Specified from –40°C to +85°C; supports deployment in automotive under-hood and industrial control enclosures. |
| Low noise performance | 35 μVRMS noise floor preserves SNR in high-resolution data acquisition channels. |
| High reliability trim | Fuse and Zener-zap wafer sort ensures consistent D-grade accuracy without post-package screening. |
Applications
| Energy Infrastructure | Analog Input Module |
|---|---|
Use Scenario: High-voltage DC monitoring in solar inverters and battery management systems. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for isolated ADCs measuring bus voltage and current. Use Value: Enables ±0.5% system-level voltage measurement accuracy over temperature without recalibration. | Use Scenario: Signal conditioning in programmable logic controller (PLC) analog input cards. IC Role / Device Role / Timing Role: Supplies reference voltage to 16-bit SAR ADCs digitizing 4–20 mA loop signals. Use Value: Maintains linearity and offset stability across –40°C to 70°C operating range with no output capacitor. |
| Data-Acquisition Systems | Field Transmitters |
Use Scenario: Portable handheld multimeters and calibration standards. IC Role / Device Role / Timing Role: Reference source for autoranging voltmeter front-end amplifiers and ADCs. Use Value: Delivers 2.048 V with <1 mV total error (initial + temp + hysteresis) over full industrial range. | Use Scenario: Two-wire 4–20 mA pressure/temperature transmitters in oil & gas field equipment. IC Role / Device Role / Timing Role: Precision voltage reference for sensor excitation and signal scaling circuitry. Use Value: Supports 12-bit effective resolution with <0.1% gain error contribution over 15-year product lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C20IDBZT | 0.5% initial accuracy, 100 ppm/°C tempco, same DBZ package and 2.048 V output | Better stability over temperature; suitable where tighter long-term drift budget applies | Select when ±0.5% initial tolerance is required and cost premium is acceptable |
| TLVH431ACDBVR | Adjustable 1.24–18 V output, 0.5% accuracy, 3-pin SOT-23, higher 80 μA min cathode current | Requires external resistor divider; not drop-in but offers flexibility in multi-voltage designs | Choose when system requires multiple reference voltages or programmability |
Compared with LM4040C20IDBZT and TLVH431ACDBVR, the LM4040D20IDBZTG4 provides lowest cost and simplest implementation for fixed 2.048 V needs, trading accuracy for reduced bill-of-materials count and guaranteed capacitor-free operation.
Availability
LM4040D20IDBZTG4 is available at Aetrix Electronics and suitable for energy infrastructure monitoring, analog input modules, data-acquisition systems, and field transmitters requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for LM4040D20IDBZTG4 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
The LM4040 series belongs to TI's precision voltage reference product line, designed specifically for cost-sensitive, space-constrained applications demanding micropower operation, low noise, and robust thermal performance without external components.
FAQ
What is the output voltage tolerance of LM4040D20IDBZTG4 over temperature?
The LM4040D20IDBZTG4 has a maximum initial accuracy of ±1.0% at 25°C and a temperature coefficient of 150 ppm/°C. Over the full –40°C to +85°C operating range, its total output voltage tolerance is ±1.98% (±1.0% ±150 ppm/°C × 65°C), equating to ±40.5 mV around the 2.048 V nominal output.
Does LM4040D20IDBZTG4 require an output capacitor for stability?
No, LM4040D20IDBZTG4 is inherently stable with all capacitive loads and does not require an output capacitor. This simplifies PCB layout and reduces BOM count - a key advantage confirmed in TI's datasheet Section 3 and Figure 8-1 typical application circuit.
What is the minimum cathode current needed for LM4040D20IDBZTG4 to regulate properly?
The LM4040D20IDBZTG4 requires a minimum cathode current of 45 μA at 25°C (80 μA over full temperature range) to maintain regulation within specifications. Below this threshold, output voltage deviates significantly from 2.048 V, as verified in Electrical Characteristics Table 6.6.
How does the NC pin (Pin 3) function in the SOT-23-3 DBZ package of LM4040D20IDBZTG4?
Pin 3 of LM4040D20IDBZTG4 is a no-connect terminal. TI recommends leaving it floating or connecting it to the anode (Pin 2) in high-EMI environments - such as near switching power supplies or transformers - to reduce noise coupling into the reference node.
Is LM4040D20IDBZTG4 suitable for automotive applications?
LM4040D20IDBZTG4 is qualified for industrial temperature range (–40°C to +85°C), not AEC-Q200 automotive grade. For automotive under-hood use requiring extended temperature operation up to +125°C, TI's LM4040D20Q variants (e.g., LM4040D20QDBZR) are specified and recommended instead.
LM4040D20IDBZTG4 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D20IDBZTG4 FAQ
1.How can I place an order for LM4040D20IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D20IDBZTG4 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 LM4040D20IDBZTG4 reliable?
The price and inventory of LM4040D20IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D20IDBZTG4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D20IDBZTG4 transactions.
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4.How is shipping managed for LM4040D20IDBZTG4?
LM4040D20IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D20IDBZTG4 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 LM4040D20IDBZTG4?
For technical support, including LM4040D20IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D20IDBZTG4 requirements.
6.How does Aetrix verify that LM4040D20IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040D20IDBZTG4 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 LM4040D20IDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040D20IDBZTG4?
All LM4040D20IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D20IDBZTG4, 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 LM4040D20IDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040D20IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D20IDBZTG4 Tags
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