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Texas Instruments LMV431AIMFX/NOPB
- Part No.:
- LMV431AIMFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LMV431AIMFX/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:23,401
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Product details
Overview
LMV431AIMFX/NOPB from Texas Instruments is an industrial-grade, adjustable precision shunt regulator with 1.24 V bandgap reference, ±0.5% initial tolerance (at 25°C), 39 ppm/°C temperature coefficient, 55 µA minimum cathode current for regulation, and 0.25 Ω dynamic output impedance. It operates from 1.24 V to 30 V output range and serves as error amplifier or voltage monitor in low-voltage power management circuits.
For engineers reviewing the LMV431AIMFX/NOPB datasheet, LMV431AIMFX/NOPB pinout, LMV431AIMFX/NOPB application, or LMV431AIMFX/NOPB equivalent, key selection criteria include its SOT-23-3 package, −40°C to +85°C operating range, low quiescent current, stable operation with capacitive loads ≥10 nF, and compatibility with series/shunt regulator topologies requiring precision feedback.
Technical Context
The LMV431AIMFX/NOPB implements a two-terminal adjustable shunt regulator architecture using an internal bandgap 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 precision regulation through temperature-compensated reference design (39 ppm/°C), low-output-impedance cathode stage (0.25 Ω), and fast turn-on response. Stability is maintained with capacitive loads between 10 nF and 50 pF, and it supports programmable output voltages from 1.24 V up to 30 V using R1/R2 divider networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal at 25°C; ±0.5% initial tolerance ensures tight setpoint accuracy for feedback loops. |
| Temperature Coefficient | 39 ppm/°C over −40°C to +85°C; enables stable regulation across industrial temperature range. |
| Dynamic Output Impedance | 0.25 Ω typical; minimizes output voltage deviation under load transients in shunt or error amplifier roles. |
| Minimum Cathode Current | 55 µA; defines lowest operating current for reliable regulation - critical for ultra-low-power designs. |
| Operating Voltage Range | 1.24 V to 30 V output programmability; supports wide-range DC-DC feedback and voltage monitoring. |
| Off-State Cathode Current | 0.001–0.1 µA at VZ = 6 V; ensures minimal leakage when disabled or in undervoltage lockout. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, RoHS-compliant, SN lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Common return path for cathode current; must be connected to system ground or return rail. |
| Pin 2 (Cathode) | Output terminal | Regulated output node; sinks current to maintain programmed voltage at adjust pin. |
| Pin 3 (Adjust) | Reference input | High-impedance feedback node (0.15–0.5 µA input current); sets output voltage via external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V - enables use in 1.8 V, 2.5 V, and 3 V systems where traditional Zeners fail. |
| Industrial temperature range | −40°C to +85°C operation with guaranteed 39 ppm/°C TC - suitable for automotive body electronics and industrial controls. |
| Low quiescent current | 55 µA min cathode current enables battery-powered voltage monitors and always-on supervision circuits. |
| Capacitive load stability | Stable with 10 nF to 50 pF loads - simplifies layout in noise-sensitive applications without external compensation. |
| Programmable output | 1.24 V to 30 V range via two-resistor divider - replaces multiple fixed-voltage references with single BOM item. |
Applications
| Overvoltage Protection | Voltage Monitor |
|---|---|
|
Use Scenario: Detecting supply rail overvoltage in 3.3 V microcontroller power domains to trigger crowbar or shutdown. IC Role / Device Role / Timing Role: Precision voltage comparator with hysteresis-free threshold set by R1/R2; cathode drives SCR gate or logic enable. Use Value: 0.5% reference tolerance ensures accurate trip point; 39 ppm/°C TC prevents thermal drift-induced false triggers. |
Use Scenario: Monitoring battery voltage in portable medical devices to initiate low-battery warning at 2.7 V. IC Role / Device Role / Timing Role: Adjustable shunt reference feeding comparator input; provides stable threshold independent of supply variation. Use Value: 55 µA regulation current enables operation from weak batteries; SOT-23-3 footprint saves space on compact PCBs. |
| Series Regulator Feedback | 3-V Off-Line Switching Regulator |
|
Use Scenario: Providing precise feedback to N-channel MOSFET-based linear regulator for clean 2.5 V analog rail. IC Role / Device Role / Timing Role: Error amplifier reference node; adjusts MOSFET gate drive to maintain regulated output. Use Value: 0.25 Ω output impedance minimizes load-regulation error; wide 1.24–30 V range accommodates diverse output targets. |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters powered from 3 V input rails. IC Role / Device Role / Timing Role: Shunt regulator in optocoupler feedback loop; regulates TL431-equivalent reference for primary controller. Use Value: Compatible with standard TL431 circuit topologies; lower 1.24 V reference allows tighter regulation margins at low input voltages. |
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, ±1% initial tolerance, higher 60 µA min cathode current, wider 2.5–36 V range. | Requires different R1/R2 values; less suitable for sub-2.5 V systems due to higher reference voltage. | Select when existing TL431-based designs require drop-in replacement with minimal resistor changes. |
| LM4040CIM3-ADJ/NOPB | Adjustable 1.235–10 V reference, ±0.5% tolerance, 60 µA max quiescent current, 3-terminal series topology (not shunt). | Cannot sink cathode current; requires external pass element; unsuitable for crowbar or direct shunt regulation. | Choose for ultra-stable series reference applications where low-noise, low-drift performance outweighs shunt topology needs. |
Compared with TL431ACDBVR and LM4040CIM3-ADJ/NOPB, LMV431AIMFX/NOPB uniquely combines sub-2 V operation, true shunt capability, and industrial temperature rating in a 3-pin SOT-23 package - making it optimal for compact, low-voltage, current-sinking feedback and protection circuits.
Availability
LMV431AIMFX/NOPB is available at Aetrix Electronics and suitable for overvoltage protection, voltage monitoring, series regulator feedback, and 3-V off-line switching regulator applications requiring stable component supply and long-term industrial-grade reliability.
Supply support for LMV431AIMFX/NOPB 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 and power management ICs.
The LMV431 family was designed for low-voltage, high-accuracy shunt regulation in space-constrained and battery-sensitive applications - delivering Zener-like functionality with superior initial tolerance, temperature stability, and programmability.
FAQ
What is the operating temperature range for LMV431AIMFX/NOPB?
The LMV431AIMFX/NOPB is rated for industrial operation from −40°C to +85°C. This range is validated per its LMV431AI grade specification and supported by guaranteed electrical characteristics including 39 ppm/°C temperature coefficient and ±0.5% reference voltage tolerance across the full span.
Can LMV431AIMFX/NOPB replace a standard Zener diode in shunt regulator circuits?
Yes, LMV431AIMFX/NOPB can directly replace Zener diodes in shunt regulator circuits - especially below 2.5 V - offering superior 1.24 V reference accuracy, lower dynamic impedance (0.25 Ω vs. typical Zener's >10 Ω), and programmable output up to 30 V via external resistors. Its active regulation eliminates Zener voltage spread and temperature drift issues.
What is the minimum cathode current required for regulation in LMV431AIMFX/NOPB?
The LMV431AIMFX/NOPB requires a minimum cathode current of 55 µA to maintain regulation, as specified in its LMV431AI electrical characteristics table. Below this threshold, the device exits regulation and cathode voltage rises toward supply rail - a critical design constraint for ultra-low-power voltage monitors.
Is LMV431AIMFX/NOPB stable with ceramic output capacitors?
Yes, LMV431AIMFX/NOPB is stable with ceramic capacitors ranging from 10 nF to 50 pF, as confirmed in the datasheet's stability boundary condition (Figure 19). Larger capacitors (>100 nF) may cause oscillation unless compensated; always verify phase margin in final layout using TI's recommended test circuits.
How does the adjust pin function in LMV431AIMFX/NOPB?
The adjust pin of LMV431AIMFX/NOPB is a high-impedance reference input (0.15–0.5 µA typical current) that senses voltage from an external resistor divider. When the divider output equals 1.24 V, the cathode regulates to VOUT = 1.24 V × (1 + R1/R2), enabling precise programmable shunt regulation without op-amp external components.
LMV431AIMFX/NOPB 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:
- 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/NOPB FAQ
1.How can I place an order for LMV431AIMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431AIMFX/NOPB 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/NOPB reliable?
The price and inventory of LMV431AIMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431AIMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMV431AIMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431AIMFX/NOPB transactions.
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4.How is shipping managed for LMV431AIMFX/NOPB?
LMV431AIMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431AIMFX/NOPB 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/NOPB?
For technical support, including LMV431AIMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431AIMFX/NOPB requirements.
6.How does Aetrix verify that LMV431AIMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV431AIMFX/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LMV431AIMFX/NOPB?
All LMV431AIMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV431AIMFX/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LMV431AIMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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