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Texas Instruments LMV431AIZ/LFT3
- Part No.:
- LMV431AIZ/LFT3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LMV431AIZ/LFT3.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,199
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Product details
Overview
LMV431AIZ/LFT3 from Texas Instruments is a precision 1.24-V adjustable shunt regulator in TO-92 package, designed for voltage reference, error amplification, and overvoltage monitoring in low-voltage systems. It delivers 0.5% initial tolerance (LMV431B grade), 39 ppm/°C temperature coefficient, 55 µA minimum cathode current, and 0.25 Ω dynamic output impedance - enabling stable regulation down to 2.7 V in LDO and switching regulator feedback paths.
For engineers reviewing the LMV431AIZ/LFT3 datasheet, LMV431AIZ/LFT3 pinout, LMV431AIZ/LFT3 application, or LMV431AIZ/LFT3 equivalent, key selection criteria include its industrial-grade −40°C to +85°C operating range, TO-92 thermal performance (161°C/W RθJA), compatibility with capacitive loads from 1 pF to 10 kΩ, and use as a programmable 1.24–30 V shunt reference in safety-critical power supervision circuits.
Technical Context
The LMV431AIZ/LFT3 implements a band-gap referenced, internally compensated two-terminal shunt regulator architecture. Its adjust pin senses a fraction of cathode voltage via external resistor divider, enabling precise output programming while maintaining low quiescent current and fast turn-on response.
It operates as a three-terminal device (Anode, Cathode, Adjust) with internal op-amp-like feedback control. The reference input current remains below 0.5 µA across temperature, and the device achieves stability with capacitive loads ≥10 nF and ≤50 pF - critical for noise-sensitive feedback loops in isolated DC/DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal at 10 mA cathode current; tight 0.5% initial tolerance ensures accurate setpoint without calibration. |
| Temperature Coefficient | 39 ppm/°C (LMV431AI grade); enables ±6 mV max drift over −40°C to +85°C for stable voltage monitoring. |
| Dynamic Output Impedance | 0.25 Ω typical; maintains regulation accuracy under load transients in error amplifier applications. |
| Min Cathode Current | 55 µA; allows operation in ultra-low-power bias networks and battery-backed supervision circuits. |
| Operating Temperature | −40°C to +85°C; qualified for industrial environments including motor drives and PLC I/O modules. |
| Cathode Voltage Range | 1.24 V to 30 V; supports wide-range programmability for both low-dropout regulators and high-side voltage monitors. |
| Off-State Current | 0.001 µA typical at 6 V; minimizes leakage in standby mode for energy-efficient designs. |
Pinout & Package
LMV431AIZ/LFT3 uses TO-92 (LP) plastic package (4.30 mm × 4.30 mm), rated for 0.78 W internal power dissipation at 25°C with 161°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink terminal | Connected to system ground or low-impedance return path; carries full cathode current minus reference input current. |
| Cathode | Regulated output terminal | Provides programmable voltage output (1.24–30 V); connects to feedback node of switching regulators or voltage monitor inputs. |
| Adjust | Reference sense input | High-impedance node (≤0.5 µA input current) that samples divided cathode voltage; sets regulation point via R1/R2 divider. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 2.7 V–3.3 V systems where Zener diodes fail to conduct reliably. |
| Industrial temperature grade | −40°C to +85°C rating supports deployment in automotive body electronics and industrial sensor nodes without derating. |
| Stable with capacitive loads | Guaranteed stability with 1 pF–10 kΩ capacitive loads eliminates need for series damping resistors in feedback paths. |
| Low output impedance | 0.25 Ω dynamic impedance ensures <1 mV output shift under 10 mA load steps - critical for precision error amplifiers. |
| Fast turn-on response | Enables rapid fault detection in crowbar circuits and overvoltage protection schemes with sub-microsecond reaction time. |
Applications
| Overvoltage Protection | 3-V Off-Line Switching Regulator |
|---|---|
Use Scenario: Monitors DC bus voltage in AC/DC adapters and detects >3.6 V excursion to trigger shutdown. IC Role / Device Role / Timing Role: Shunt-based voltage comparator with hysteresis via external resistor network. Use Value: Replaces discrete Zener+transistor clamps with 0.5% threshold accuracy and 39 ppm/°C drift control. | Use Scenario: Provides feedback voltage reference for TL431-replacement topologies in 3 V-input flyback converters. IC Role / Device Role / Timing Role: Adjustable shunt reference in optocoupler-coupled secondary-side regulation loop. Use Value: Enables stable 3.3 V output regulation at light loads where TL431 exhibits poor PSRR and higher quiescent current. |
| Voltage Monitor for MCU Reset | Low-Dropout N-Channel Series Regulator |
Use Scenario: Supervises 1.8 V core rail of microcontrollers and asserts reset when voltage falls below 1.75 V. IC Role / Device Role / Timing Role: Precision threshold detector driving open-drain reset generator IC or GPIO interrupt. Use Value: Achieves ±6 mV total error over temperature - tighter than standard supervisor ICs with fixed thresholds. | Use Scenario: Controls gate of external N-channel MOSFET to regulate 2.7 V output from 3.3 V supply in portable devices. IC Role / Device Role / Timing Role: Adjustable reference setting MOSFET conduction point in linear pass element configuration. Use Value: Delivers 1.24 V reference with 55 µA min cathode current - extends battery life vs. fixed 1.25 V references requiring higher bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.495 V nominal reference; higher 2% initial tolerance; requires ≥1 mA cathode current. | Not suitable for sub-2.5 V systems; higher power consumption limits battery use. | Select when 2.5 V reference suffices and legacy TL431 footprint compatibility is required. |
| LM4040CIM3-ADJ/NOPB | Fixed 1.2 V or 2.048 V options only; no adjustable version; 0.5% tolerance but 100 ppm/°C TC. | Lacks programmability; unsuitable for variable-output or multi-rail monitoring. | Choose only for single-point voltage reference needs where adjustability is unnecessary. |
Compared with TL431ACDBVR and LM4040CIM3-ADJ/NOPB, LMV431AIZ/LFT3 uniquely combines 1.24 V low-voltage operation, 0.5% tolerance, adjustable 1.24–30 V range, and 55 µA minimum cathode current - making it the only viable option for precision, low-power, programmable shunt regulation in space-constrained industrial and portable designs.
Availability
LMV431AIZ/LFT3 is available at Aetrix Electronics and suitable for overvoltage protection, 3-V off-line switching regulators, and low-dropout N-channel series regulators requiring stable component supply across extended temperature ranges.
Supply support for LMV431AIZ/LFT3 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 for industrial, automotive, and personal electronics markets.
The LMV431 family was engineered specifically for precision shunt regulation in low-voltage, low-power applications - targeting replacement of Zener diodes and legacy references in modern compact power supplies and supervisory circuits.
FAQ
What is the maximum cathode voltage supported by LMV431AIZ/LFT3?
The LMV431AIZ/LFT3 supports a maximum cathode voltage of 35 V per absolute maximum ratings. In normal operation, it is specified for cathode voltages up to 30 V while maintaining regulation accuracy and thermal stability within its TO-92 package limits. Exceeding 30 V may require external current limiting and thermal derating per the datasheet's derating curve.
Can LMV431AIZ/LFT3 replace a standard Zener diode in a 3.3 V LDO feedback network?
Yes, LMV431AIZ/LFT3 can directly replace Zener diodes in 3.3 V LDO feedback networks. Its 1.24 V reference, adjustable via two external resistors, provides superior initial accuracy (0.5%), lower temperature drift (39 ppm/°C), and lower dynamic impedance (0.25 Ω) compared to typical 3.3 V Zeners - resulting in tighter output regulation and improved line/load transient response in the LMV431AIZ/LFT3-based design.
What is the minimum cathode current required for regulation in LMV431AIZ/LFT3?
The LMV431AIZ/LFT3 requires a minimum cathode current of 55 µA to maintain regulation, as specified in the LMV431AI electrical characteristics table. This low requirement enables reliable operation in high-impedance feedback dividers and ultra-low-power supervision circuits where traditional references draw significantly more current - a key advantage of the LMV431AIZ/LFT3 in battery-powered applications.
Is LMV431AIZ/LFT3 compatible with ceramic output capacitors in shunt regulator configurations?
Yes, LMV431AIZ/LFT3 is stable with ceramic capacitors ranging from 1 pF to 10 kΩ, including common X7R and C0G types used in shunt regulator outputs. The device's internal compensation ensures phase margin retention without requiring series damping resistors - simplifying layout and improving transient response in LMV431AIZ/LFT3-based voltage monitors and error amplifiers.
How does the temperature coefficient of LMV431AIZ/LFT3 compare to TL431-based solutions?
The LMV431AIZ/LFT3 has a guaranteed temperature coefficient of 39 ppm/°C (LMV431AI grade), significantly better than the typical 50–100 ppm/°C of standard TL431 variants. This translates to ±6 mV max reference drift over −40°C to +85°C versus ±12–24 mV for TL431 - making LMV431AIZ/LFT3 preferable for precision voltage monitoring and industrial-grade power sequencing where thermal stability is critical.
LMV431AIZ/LFT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 30 V
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LMV431AIZ/LFT3 FAQ
1.How can I place an order for LMV431AIZ/LFT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431AIZ/LFT3 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 LMV431AIZ/LFT3 reliable?
The price and inventory of LMV431AIZ/LFT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431AIZ/LFT3 is usually 5 days.
3.What payment methods are accepted for LMV431AIZ/LFT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431AIZ/LFT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431AIZ/LFT3?
LMV431AIZ/LFT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431AIZ/LFT3 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 LMV431AIZ/LFT3?
For technical support, including LMV431AIZ/LFT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431AIZ/LFT3 requirements.
6.How does Aetrix verify that LMV431AIZ/LFT3 is sourced from the original manufacturer or authorized distributors?
All LMV431AIZ/LFT3 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 LMV431AIZ/LFT3 meets industry standards.
7.What is the process for return or replacement of LMV431AIZ/LFT3?
All LMV431AIZ/LFT3 units undergo pre-shipment inspection (PSI). If there is an issue with LMV431AIZ/LFT3, 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 LMV431AIZ/LFT3 part is unused and in its original packaging.
Return procedure for LMV431AIZ/LFT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431AIZ/LFT3 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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