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Texas Instruments LM4040A30IDBZT
- Part No.:
- LM4040A30IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A30IDBZT.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
LM4040A30IDBZT from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 3.0V output with ±0.1% initial accuracy (A grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 47μA to 15mA cathode current - used in high-accuracy analog input modules and data-acquisition front-ends.
For engineers reviewing the LM4040A30IDBZT datasheet, LM4040A30IDBZT pinout, LM4040A30IDBZT application, or LM4040A30IDBZT equivalent, key selection criteria include industrial-temperature operation (–40°C to +85°C), SOT-23-3 package compatibility, low-noise performance for ADC biasing, and minimal external component requirements.
Technical Context
The LM4040A30IDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 3.0V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without external components or output capacitors.
It features low dynamic impedance (0.4Ω typical at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm over 1000 hours - enabling stable reference performance across load, temperature, and time in portable and industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal; fixed shunt reference voltage at 100μA test current - sets absolute scaling for 12–16-bit ADCs and DACs. |
| Initial Accuracy | ±0.1% max at 25°C - enables single-point calibration in precision sensor signal chains without trimming. |
| Temp Coefficient | 100ppm/°C max - contributes ≤±6.5mV drift over –40°C to +85°C ambient, critical for unheated field transmitters. |
| Noise (10Hz–10kHz) | 35μVRMS typical - avoids quantization noise floor elevation in 24-bit delta-sigma ADCs. |
| Min Cathode Current | 47μA typical - supports ultra-low-power wake-up circuits and battery-backed monitoring nodes. |
| Dynamic Impedance | 0.4Ω typical at 1mA - maintains regulation under fast load transients in multiplexed analog front-ends. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial control, energy metering, and automotive cabin electronics. |
Pinout & Package
SOT-23-3 (DBZ) package: compact 2.92mm × 1.30mm footprint with gull-wing leads, optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to supply rail; sinks current to regulate voltage at anode - must be decoupled if driving noisy loads. |
| Anode (Pin 2) | Reference output / ground reference | Provides stable 3.0V relative to system ground; ties directly to ADC REF+ or op-amp non-inverting input. |
| NC (Pin 3) | No internal connection | Unused terminal; left floating or tied to anode per EMI mitigation guidance in high-noise environments. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with all capacitive loads up to 10μF - eliminates BOM cost and layout area for external stabilization. |
| Micropower startup | 47μA minimum cathode current - enables use in always-on sensor nodes powered by coin cells or energy harvesters. |
| Low thermal hysteresis | 0.08% - ensures repeatable voltage after thermal cycling, essential for calibration-critical test equipment. |
| High PSRR | 60dB typical at 1kHz - rejects ripple from switching regulators feeding mixed-signal subsystems. |
| Long-term stability | 120ppm over 1000 hours - reduces need for periodic recalibration in deployed industrial instrumentation. |
Applications
| Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: High-channel-count PLC analog input card digitizing 4–20mA and ±10V signals with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference buffer and sensor excitation circuitry. Use Value: ±0.1% initial accuracy and 100ppm/°C TC enable <1 LSB error across full industrial temperature range without software correction. |
Use Scenario: Portable handheld multimeter with autoranging, true RMS conversion, and battery operation. IC Role / Device Role / Timing Role: Stable 3.0V reference for dual-slope integrator and auto-zero amplifier stages. Use Value: 35μVRMS noise prevents added uncertainty in sub-millivolt DC measurements; 47μA min current extends battery life. |
| Field Transmitter | Energy Infrastructure |
Use Scenario: Loop-powered 4–20mA temperature transmitter with HART modulation in oil & gas wellheads. IC Role / Device Role / Timing Role: Precision reference for RTD bridge excitation and DAC-controlled current loop setpoint. Use Value: Thermal hysteresis ≤0.08% ensures repeatability after ambient swings from –40°C winter to +85°C summer exposure. |
Use Scenario: Smart electricity meter measuring voltage, current, and power quality on 3-phase distribution lines. IC Role / Device Role / Timing Role: Reference for isolation amplifier feedback and metrology ADC in revenue-grade metering ICs. Use Value: Long-term stability of 120ppm/1000h meets IEC 62053-21 Class 0.2 accuracy requirements over 10-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3030AIDBZR | 3.0V, ±0.2% initial accuracy, 50ppm/°C TC, 25μVRMS noise, 50μA min current - lower noise and TC but looser initial tolerance. | Better for low-drift, low-noise applications where post-calibration is acceptable; not A-grade accuracy. | Select when noise budget is tighter than absolute accuracy - e.g., audio ADC biasing where 25μVRMS matters more than ±0.1%. |
| ADR3430ARJZ-R7 | 3.0V, ±0.1% initial accuracy, 10ppm/°C TC, 10μVRMS noise, 100μA min current - superior TC/noise but higher quiescent current. | Preferred for high-stability lab equipment; unsuitable for micropower or battery-operated designs. | Choose when ultra-low drift dominates - e.g., portable calibrators requiring <1ppm/°C contribution - but verify 100μA min current fits system budget. |
Compared with REF3030AIDBZR and ADR3430ARJZ-R7, the LM4040A30IDBZT uniquely balances A-grade accuracy, micropower operation (47μA), and SOT-23-3 footprint - making it optimal for cost-sensitive, space-constrained industrial sensors where ±0.1% and 100ppm/°C are sufficient.
Availability
LM4040A30IDBZT is available at Aetrix Electronics and suitable for analog input modules, data-acquisition systems, and field transmitters requiring stable component supply with guaranteed long-term sourcing and TI-authorized traceability.
Supply support for LM4040A30IDBZT 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 industrial-grade reliability.
The LM4040 series was engineered for high-accuracy, low-power shunt reference applications in harsh environments - targeting industrial automation, energy metering, and portable test equipment where size, stability, and simplicity are critical.
FAQ
What is the operating temperature range for the LM4040A30IDBZT?
The LM4040A30IDBZT is specified for industrial temperature operation from –40°C to +85°C. This range is validated per TI's LM4040A30I characterization, supporting deployment in factory-floor controllers, outdoor energy monitors, and automotive cabin electronics without derating.
Does the LM4040A30IDBZT require an external output capacitor?
No, the LM4040A30IDBZT is stable with all capacitive loads and requires no external output capacitor. Its internal design ensures phase margin across 0–10μF load capacitance, simplifying layout and reducing BOM count in space-constrained analog front-ends.
What is the minimum cathode current needed for regulation in the LM4040A30IDBZT?
The LM4040A30IDBZT requires a minimum cathode current of 47μA (typical) at 25°C to maintain regulation. At full temperature range (–40°C to +85°C), the maximum specified minimum is 82μA - critical for designing low-power wake-up circuits and energy-harvesting interfaces.
How does the LM4040A30IDBZT compare to bandgap references in terms of noise performance?
The LM4040A30IDBZT delivers 35μVRMS wideband noise (10Hz–10kHz), significantly lower than most bandgap shunt references (typically >60μVRMS). This makes it preferred for high-resolution ADCs where reference noise directly limits effective resolution - especially in 24-bit delta-sigma architectures.
Is Pin 3 (NC) on the LM4040A30IDBZT required to be left floating?
Pin 3 is internally unconnected and may be left floating. However, TI recommends connecting it to the anode (Pin 2) in high-EMI environments - such as near switch-mode power supplies or motor drives - to reduce susceptibility to high-frequency noise coupling into the reference node.
LM4040A30IDBZT 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):
- 3V
- 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:
- 82 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040A30IDBZT FAQ
1.How can I place an order for LM4040A30IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A30IDBZT 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 LM4040A30IDBZT reliable?
The price and inventory of LM4040A30IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A30IDBZT is usually 5 days.
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Once your LM4040A30IDBZT 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 LM4040A30IDBZT?
For technical support, including LM4040A30IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A30IDBZT requirements.
6.How does Aetrix verify that LM4040A30IDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040A30IDBZT 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 LM4040A30IDBZT meets industry standards.
7.What is the process for return or replacement of LM4040A30IDBZT?
All LM4040A30IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A30IDBZT, 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 LM4040A30IDBZT part is unused and in its original packaging.
Return procedure for LM4040A30IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A30IDBZT Tags
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