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Texas Instruments LMV431AIMFX
- Part No.:
- LMV431AIMFX
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LMV431AIMFX.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,829
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Product details
Overview
LMV431AIMFX from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-3 package, designed for low-voltage regulation (1.24 V to 30 V), with 0.5% initial reference voltage tolerance, 39 ppm/°C temperature coefficient, and 55 µA minimum cathode current for regulation. It serves as an error amplifier in 3-V off-line switching regulators and voltage monitors in industrial power supplies.
For engineers reviewing the LMV431AIMFX datasheet, LMV431AIMFX pinout, LMV431AIMFX application, or LMV431AIMFX equivalent, this page delivers verified electrical specs, thermal derating guidance, stability conditions for capacitive loads (1 pF–10 kΩ), and real-world implementation circuits including overvoltage protection and constant-current sink configurations.
Technical Context
The LMV431AIMFX operates as a two-terminal adjustable shunt reference, using internal band-gap reference and high-gain transconductance amplifier. Its cathode voltage is controlled via negative feedback from cathode to adjust pin - functionally equivalent to a non-inverting op-amp configuration with external resistor divider.
It achieves stable operation with capacitive loads ≥1 pF and ≤10 nF, supports fast turn-on response, and maintains low dynamic output impedance (0.25 Ω) across 0.1–15 mA cathode current range. The device is rated for −40°C to +85°C industrial temperature operation and features 0.001–0.1 µA off-state current at 6 V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal at 25°C; ±0.5% initial tolerance (1.234–1.246 V) ensures tight output setpoint accuracy in feedback loops. |
| Temperature Coefficient | 39 ppm/°C over −40°C to +85°C; enables predictable drift compensation in industrial environments without external trimming. |
| Dynamic Output Impedance | 0.25 Ω typical; provides low-impedance reference node critical for loop stability in series/shunt regulator designs. |
| Minimum Cathode Current | 55 µA; defines lowest operating current for regulation - enables ultra-low-power biasing in battery-backed systems. |
| Off-State Cathode Current | 0.001–0.1 µA at VZ = 6 V; ensures minimal leakage during disable or fault conditions in crowbar circuits. |
| Operating Temperature Range | −40°C to +85°C; qualified for industrial-grade reliability in embedded power management and sensing applications. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, single-row 3-pin surface-mount outline with gull-wing leads. Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Adjust (REF). Pin 2 is internally connected to cathode; Pin 3 is reference input terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current return path | Connects to system ground or low-side return; sets reference potential for internal band-gap core. |
| Cathode (Pin 2) | Regulated output node | Delivers controlled voltage/current; used as feedback point in shunt or series regulator topologies. |
| Adjust (REF, Pin 3) | Reference input | Accepts voltage divider feedback; controls cathode voltage per VCATHODE = VREF(1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24-V fixed reference with 1.24–30-V adjustable range enables use in 1.8-V, 2.5-V, and 3.3-V systems where Zener diodes fail. |
| Industrial temperature grade | −40°C to +85°C operation with 39 ppm/°C tempco ensures stable reference performance in motor drives and PLCs. |
| Low quiescent current | 55 µA min cathode current allows regulation in micropower applications such as energy-harvesting sensors. |
| Capacitive load stability | Stable with 1 pF–10 nF capacitive loads eliminates need for external compensation in most DC/DC feedback networks. |
| Fast turn-on response | Enables rapid enable/disable in power sequencing and fault-detection circuits without overshoot or delay penalties. |
Applications
| 3-V Off-Line Switching Regulator | Voltage Monitor |
|---|---|
Use Scenario: Feedback control in isolated flyback converters powered from rectified AC mains. IC Role / Device Role / Timing Role: Error amplifier comparing secondary-side output voltage against 1.24-V reference to regulate optocoupler LED drive current. Use Value: Enables precise ±1% output regulation without transformer turns-ratio dependency or secondary-side LDO. |
Use Scenario: Detecting overvoltage on microcontroller I/O rails or battery charging lines. IC Role / Device Role / Timing Role: Adjustable threshold comparator with hysteresis via external resistors, driving MOSFET gate or logic signal. Use Value: Replaces discrete Zener + transistor solutions with 0.5% reference accuracy and <1 µA standby current. |
| Low Dropout N-Channel Series Regulator | Crowbar Circuit |
Use Scenario: Generating clean 2.7-V supply from 3.0-V Li-ion battery in portable instrumentation. IC Role / Device Role / Timing Role: Shunt-based reference controlling gate of external N-channel MOSFET pass element. Use Value: Achieves <100 mV dropout at 100 mA while maintaining 1.24-V reference stability across battery discharge curve. |
Use Scenario: Protecting downstream circuitry from catastrophic overvoltage events in DC power distribution. IC Role / Device Role / Timing Role: Triggering SCR or TRIAC gate when sensed voltage exceeds preset threshold. Use Value: Provides sub-100 ns response time and 0.5% trip-point repeatability, eliminating mechanical fuse reliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | Same 1.24-V reference, but 1% initial tolerance (vs. LMV431AIMFX's 0.5%) and higher 100 µA min cathode current. | Less precise setpoint control; suitable where cost sensitivity outweighs tight regulation needs. | Select TLV431ACDBVR for commercial-temp (0°C to 70°C) designs requiring lower BOM cost and wider availability. |
| LM4040CIM3-ADJ | Fixed 2.5-V or 4.096-V references only; no adjustable version. Higher 0.2% tolerance but tighter 20 ppm/°C tempco. | Cannot replace LMV431AIMFX in adjustable-range applications; limited to fixed-output configurations. | Choose LM4040CIM3-ADJ only if fixed reference voltage suffices and superior temperature stability is required over adjustability. |
Compared with TLV431ACDBVR and LM4040CIM3-ADJ, the LMV431AIMFX uniquely combines 0.5% initial tolerance, −40°C to +85°C operation, and full 1.24–30-V adjustability in SOT-23-3 - making it optimal for industrial shunt regulation where precision, temperature resilience, and design flexibility are jointly critical.
Availability
LMV431AIMFX is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and embedded voltage monitoring requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LMV431AIMFX 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 voltage references and power management ICs.
The LMV431AIMFX belongs to TI's LMV431x family of low-voltage adjustable shunt regulators, engineered specifically for cost-sensitive, space-constrained industrial and consumer power systems needing high-accuracy, low-quiescent-current reference solutions.
FAQ
What is the maximum cathode voltage rating for LMV431AIMFX?
The LMV431AIMFX has an absolute maximum cathode voltage rating of 35 V. Operation beyond this risks permanent damage. For reliable long-term use, TI recommends limiting cathode voltage to ≤30 V under normal operating conditions, consistent with its specified adjustable range and thermal derating curves.
Can LMV431AIMFX be used as a 1.24-V fixed reference without external resistors?
Yes - connecting the cathode directly to the adjust (REF) pin configures LMV431AIMFX as a 1.24-V fixed shunt reference, functioning like a precision Zener diode. This voltage-follower mode requires no external resistors and retains the device's 0.5% initial tolerance and 39 ppm/°C temperature coefficient.
Does LMV431AIMFX require an external capacitor for stability?
No external capacitor is required for basic stability. The LMV431AIMFX is internally compensated and remains stable with capacitive loads from 1 pF up to 10 nF. Larger capacitors (>10 nF) may cause oscillation unless paired with series resistance per TI's Figure 19 stability boundary chart.
What is the thermal derating behavior of LMV431AIMFX in SOT-23-3 package?
In the SOT-23-3 (DBZ) package, LMV431AIMFX has a junction-to-ambient thermal resistance (RθJA) of 455°C/W. At ambient temperatures above 25°C, power dissipation must be linearly derated at 2.2 mW/°C - e.g., max 250 mW at 25°C drops to ~150 mW at 70°C ambient.
How does LMV431AIMFX differ from LMV431BIMFX in practical design?
The LMV431AIMFX offers 0.5% initial reference tolerance and −40°C to +85°C operation, while LMV431BIMFX improves tolerance to 0.2% (1.238–1.242 V) but shares identical package, pinout, and temperature range. Choose LMV431AIMFX for industrial-grade precision; upgrade to LMV431BIMFX only when sub-0.3% setpoint accuracy is mandatory.
LMV431AIMFX 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:
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LMV431AIMFX FAQ
1.How can I place an order for LMV431AIMFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431AIMFX 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 LMV431AIMFX reliable?
The price and inventory of LMV431AIMFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431AIMFX is usually 5 days.
3.What payment methods are accepted for LMV431AIMFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431AIMFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431AIMFX?
LMV431AIMFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431AIMFX 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 LMV431AIMFX?
For technical support, including LMV431AIMFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431AIMFX requirements.
6.How does Aetrix verify that LMV431AIMFX is sourced from the original manufacturer or authorized distributors?
All LMV431AIMFX 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 LMV431AIMFX meets industry standards.
7.What is the process for return or replacement of LMV431AIMFX?
All LMV431AIMFX units undergo pre-shipment inspection (PSI). If there is an issue with LMV431AIMFX, 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 LMV431AIMFX part is unused and in its original packaging.
Return procedure for LMV431AIMFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431AIMFX Tags
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