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Texas Instruments LM4040A20IDBZRG4
- Part No.:
- LM4040A20IDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A20IDBZRG4.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
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Product details
Overview
LM4040A20IDBZRG4 from Texas Instruments is a precision 2.048V shunt voltage reference in SOT-23-3 (DBZ) package, rated A-grade with ±0.1% initial accuracy and 100ppm/°C temperature coefficient over –40°C to 85°C. It delivers low 35μVRMS noise, operates from 45μA minimum cathode current, and maintains stability with all capacitive loads-ideal for high-resolution ADC biasing in portable data-acquisition systems.
For engineers reviewing the LM4040A20IDBZRG4 datasheet, LM4040A20IDBZRG4 pinout, LM4040A20IDBZRG4 application, or LM4040A20IDBZRG4 equivalent, key selection factors include its 2.048V output's exact match to 12-bit DAC/ADC full-scale scaling, tight industrial-temperature tolerance, micropower operation, and no-output-capacitor requirement in space-constrained designs.
Technical Context
The LM4040A20IDBZRG4 functions as a two-terminal shunt reference, sinking cathode current (IZ) to regulate voltage across its anode–cathode terminals. Its Zener-zap trimmed reverse breakdown ensures 2.048V nominal output with A-grade precision, and its low dynamic impedance (≤0.8Ω at 1mA) enables stable regulation under varying load currents from 45μA to 15mA.
Designed for direct integration into feedback paths of op-amp-based current sources or as a precision bias node, it requires no external compensation and exhibits thermal hysteresis of only 0.08% across –40°C to 125°C cycling-critical for repeatable measurements in field transmitters and energy infrastructure monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal - matches 12-bit binary full-scale (212 = 4096 steps), enabling exact ratiometric scaling with 2.048V-referenced ADCs/DACs |
| Initial Accuracy | ±0.1% at 25°C - guarantees ≤±2.05mV absolute error without calibration in production test fixtures |
| Tempco | 100ppm/°C max - contributes ≤±6.5mV drift over –40°C to 85°C ambient, supporting <0.1% system-level accuracy |
| Min Cathode Current | 45μA typical - allows operation from ultra-low-power microcontrollers or battery-backed sensors |
| Output Noise | 35μVRMS (10Hz–10kHz) - avoids quantization noise floor elevation in 16-bit+ data converters |
| Dynamic Impedance | 0.3–0.8Ω at 1mA - ensures <1mV load-regulation shift per 1mA current change in precision current-sink circuits |
| Long-Term Stability | 120ppm after 1000h - supports >10-year calibration intervals in industrial instrumentation |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input | Connects to regulated voltage node; sinks all excess current to maintain 2.048V at anode |
| Anode (Pin 2) | Reference ground return | Must be connected to system ground or low-impedance return path; defines 0V reference point |
| NC (Pin 3) | No internal connection | Left unconnected; floating or tied to anode only in high-EMI environments per TI recommendation |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load up to 10μF - eliminates BOM cost and PCB area for decoupling caps in analog front-ends |
| Wide operating current range | 45μA to 15mA cathode current - supports both ultra-low-power sensor nodes and higher-current reference buffers |
| Low thermal hysteresis | 0.08% voltage shift after –40°C ↔ 125°C cycling - ensures measurement repeatability in outdoor or automotive thermal cycles |
| Extended temperature grade option | LM4040A20Q variant available for –40°C to 125°C - enables use in engine control or power electronics where ambient exceeds 85°C |
| Fuse/Zener-zap trimming | Wafer-sort precision trimming - achieves 0.1% initial accuracy without post-package calibration |
Applications
| Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: High-channel-count PLC analog input card measuring 4–20mA sensor signals with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC VREF and DAC output scaling, eliminating ratiometric errors from supply variation. Use Value: Enables <0.05% total unadjusted error (TUE) across –25°C to 70°C without recalibration, reducing factory test time by 30%. | Use Scenario: Portable handheld multimeter with auto-ranging and true RMS calculation. IC Role / Device Role / Timing Role: Supplies precision bias to op-amp gain stages and ADC reference, directly tied to battery-powered microcontroller ADC inputs. Use Value: 45μA min current allows operation down to 2.2V supply, extending battery life to >200 hours on two AA cells. |
| Field Transmitter | Energy Infrastructure |
Use Scenario: Loop-powered 4–20mA HART transmitter in oil & gas wellhead monitoring. IC Role / Device Role / Timing Role: Sets excitation voltage for RTD/thermocouple signal conditioning and provides reference for HART modem DAC. Use Value: 0.08% thermal hysteresis ensures <±0.1°C repeatability after daily ambient swings from –40°C to 60°C. | Use Scenario: Smart electricity meter with metrology-grade AFE and anti-tampering detection. IC Role / Device Role / Timing Role: References polyphase energy measurement ICs (e.g., ADE78xx) and isolation amplifier bias networks. Use Value: 120ppm long-term stability meets IEC 62053-21 Class 0.2 accuracy requirements over 10-year field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6002AEUR+T | 2.048V, ±0.1%, 75ppm/°C, SOT-23-3, 35μVRMS noise, but 60μA min cathode current | Higher min current limits use in sub-50μA sleep modes; tighter tempco benefits extended temperature spans | Select when lower tempco outweighs slightly higher quiescent current in battery-critical designs |
| ADR3420ARJZ-R7 | 2.048V, ±0.1%, 100ppm/°C, SOT-23-5, 30μVRMS noise, 100μA min cathode current, includes enable pin | 5-pin package adds shutdown control but increases layout area; higher min current reduces ultra-low-power viability | Choose when system-level power sequencing or dynamic reference enable/disable is required |
Compared with MAX6002AEUR+T and ADR3420ARJZ-R7, LM4040A20IDBZRG4 offers the lowest minimum cathode current (45μA) and identical 100ppm/°C tempco, making it optimal for always-on, space-constrained industrial sensors where startup current and board area are primary constraints.
Availability
LM4040A20IDBZRG4 is available at Aetrix Electronics and suitable for analog input modules, portable data-acquisition systems, field transmitters, and energy infrastructure metering requiring stable component supply with guaranteed long-term availability and traceable lot control.
Supply support for LM4040A20IDBZRG4 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM4040 series was designed specifically for precision shunt reference applications demanding micropower operation, zero-output-capacitor stability, and A–D grade accuracy across industrial temperature ranges.
FAQ
What is the maximum cathode current rating for LM4040A20IDBZRG4?
The absolute maximum cathode current for LM4040A20IDBZRG4 is 25mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA to ensure specified electrical performance-including initial accuracy, tempco, and noise-remains within datasheet limits across –40°C to 85°C.
Can LM4040A20IDBZRG4 operate without an output capacitor?
Yes, LM4040A20IDBZRG4 is explicitly designed to be stable with all capacitive loads and requires no output capacitor. This is confirmed in TI's datasheet Section 3 and Section 8.2, where it states "no output capacitor required" and demonstrates stable operation up to 10μF in typical application circuits.
What does the 'G4' suffix indicate in LM4040A20IDBZRG4?
The 'G4' suffix in LM4040A20IDBZRG4 denotes TI's green packaging standard: lead-free, RoHS-compliant, and halogen-free construction. It reflects environmental compliance per JEDEC J-STD-609 and does not affect electrical specifications or thermal performance of the LM4040A20IDBZRG4 device.
How does LM4040A20IDBZRG4 achieve its 0.1% initial accuracy?
LM4040A20IDBZRG4 achieves ±0.1% initial accuracy via wafer-level fuse and Zener-zap reverse breakdown voltage trimming during sort testing. This laser-trimming process adjusts the Zener voltage precisely at the die level before packaging, eliminating need for post-package calibration and ensuring the LM4040A20IDBZRG4 meets A-grade tolerance without external adjustment.
Is LM4040A20IDBZRG4 suitable for automotive applications?
LM4040A20IDBZRG4 is qualified for industrial temperature range (–40°C to 85°C) and is not AEC-Q200 qualified. For automotive applications requiring extended temperature operation (–40°C to 125°C), TI offers the LM4040A20Q variant-same 2.048V A-grade accuracy but with Q-grade qualification. LM4040A20IDBZRG4 itself is used in non-safety-critical automotive subsystems like infotainment or body electronics where ambient stays below 85°C.
LM4040A20IDBZRG4 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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- 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
LM4040A20IDBZRG4 FAQ
1.How can I place an order for LM4040A20IDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A20IDBZRG4 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 LM4040A20IDBZRG4 reliable?
The price and inventory of LM4040A20IDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A20IDBZRG4 is usually 5 days.
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4.How is shipping managed for LM4040A20IDBZRG4?
LM4040A20IDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040A20IDBZRG4 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 LM4040A20IDBZRG4?
For technical support, including LM4040A20IDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A20IDBZRG4 requirements.
6.How does Aetrix verify that LM4040A20IDBZRG4 is sourced from the original manufacturer or authorized distributors?
All LM4040A20IDBZRG4 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 LM4040A20IDBZRG4 meets industry standards.
7.What is the process for return or replacement of LM4040A20IDBZRG4?
All LM4040A20IDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A20IDBZRG4, 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 LM4040A20IDBZRG4 part is unused and in its original packaging.
Return procedure for LM4040A20IDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A20IDBZRG4 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
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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