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Texas Instruments LMV431AIM5
- Part No.:
- LMV431AIM5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431AIM5.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:28,669
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Product details
Overview
LMV431AIM5 from Texas Instruments is an industrial-grade, adjustable precision shunt regulator with 1.24 V reference voltage, 0.5% initial tolerance (LMV431B-grade), 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 and serves as a low-voltage alternative to Zener diodes in feedback loops of DC-DC converters and voltage monitors.
For engineers reviewing the LMV431AIM5 datasheet, LMV431AIM5 pinout, LMV431AIM5 application, or LMV431AIM5 equivalent, key selection criteria include its SOT-23-5 package, −40°C to +85°C operating range, stable operation with 10 nF–50 pF capacitive loads, and compatibility with two-resistor external programming for adjustable output voltage.
Technical Context
The LMV431AIM5 functions as a 3-terminal adjustable shunt reference, using internal bandgap reference and op-amp-like error amplifier topology where the adjust (REF) pin senses voltage via external resistor divider and controls cathode current to maintain precise cathode voltage. Its architecture enables voltage follower mode (cathode-to-REF short) for fixed 1.24 V output or programmable regulation up to 30 V.
It features low quiescent current (55 µA typ.), fast turn-on response, and inherent stability with small capacitive loads - verified for CL = 10 nF to 50 pF - making it suitable for space-constrained, low-power feedback paths in switching regulators and voltage supervision circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal at 25°C; tight 1.228–1.252 V range over full temperature ensures accurate setpoint in precision feedback loops. |
| Initial Tolerance | ±0.5% (LMV431B-grade); enables high-accuracy output without trimming in production systems. |
| Tempco | 39 ppm/°C; limits reference drift to ±3.9 mV over −40°C to +85°C, critical for industrial thermal stability. |
| Min Cathode Current | 55 µA; allows regulation down to ultra-low power states, supporting battery-backed or energy-harvesting designs. |
| Dynamic Output Impedance | 0.25 Ω; provides stiff reference node, minimizing load-induced voltage sag in error amplifier applications. |
| Operating Range | −40°C to +85°C; qualified for industrial environments including motor drives and PLC I/O modules. |
| Cathode Voltage Max | 35 V absolute max; supports use in 24 V and 30 V systems with margin for transients. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, surface-mount, lead-free (Sn), moisture sensitivity level 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Must be left floating; no routing or soldering required - avoids unintended parasitic coupling. |
| Pin 2 (Anode) | Current sink terminal | Connected to system ground or return path; carries full cathode current minus REF input current. |
| Pin 3 (Cathode) | Regulated output terminal | Delivers programmed voltage; connects to feedback node of DC-DC controller or voltage monitor comparator. |
| Pin 4 (REF) | Reference input | Senses divided output voltage; high-impedance (≤0.5 µA input) enables high-R divider networks for low power. |
| Pin 5 (Anode) | Second anode connection | Internally tied to Pin 2; must be connected to same ground net - improves thermal and current-handling capability. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where traditional Zeners fail. |
| Adjustable output range | Programmable from 1.24 V to 30 V using two external resistors - replaces multiple fixed Zeners with one BOM item. |
| Industrial temperature grade | −40°C to +85°C operation - certified for deployment in factory automation, telecom power, and outdoor electronics. |
| Capacitive load stability | Stable with 10 nF–50 pF loads - eliminates need for external compensation in compact PCB layouts. |
| Low output impedance | 0.25 Ω dynamic impedance - maintains regulation accuracy under varying load currents in feedback paths. |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Providing precise 5 V reference for isolated flyback converter feedback across wide input voltage range (9–36 V). IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled secondary-side feedback loop, replacing discrete Zener + transistor. Use Value: Enables ±1% output regulation without trimming; 0.25 Ω impedance minimizes load-induced error in opto-LED drive current. | Use Scenario: Building a low-dropout 3.3 V series regulator from 5 V rail for noise-sensitive analog circuitry. IC Role / Device Role / Timing Role: Adjustable reference controlling P-MOSFET gate via op-amp buffer to regulate output. Use Value: Achieves <10 mV line/load regulation with 1.24 V reference accuracy and 39 ppm/°C stability - superior to standard bandgap references. |
| Voltage Monitor | Error Amplifier |
Use Scenario: Detecting undervoltage condition (<2.7 V) on a 3.3 V microcontroller supply to trigger safe shutdown. IC Role / Device Role / Timing Role: Precision threshold detector with hysteresis added via resistor network on REF pin. Use Value: 0.5% tolerance ensures reliable trip point at 2.70 V ±13.5 mV - eliminates false triggers in noisy industrial environments. | Use Scenario: Compensating voltage-mode PWM controller (e.g., UC384x) in offline AC-DC adapter. IC Role / Device Role / Timing Role: High-accuracy error amplifier reference setting feedback setpoint for primary-side regulation. Use Value: Low 55 µA operating current reduces bias network loading; 39 ppm/°C tempco maintains ±0.3% output accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Higher 2.495 V reference, ±1% tolerance, wider 2.5–36 V adj range, higher 60 µA min cathode current. | Requires redesign of resistor divider; less suitable for sub-2.5 V systems but more common in legacy 5 V/12 V supplies. | Choose when existing TL431 design exists or higher reference voltage simplifies feedback scaling. |
| MAX6008AEUR+T | Fixed 1.25 V output, SOT-23-3, ±0.2% initial accuracy, 20 ppm/°C, 35 µA quiescent current. | Not adjustable - limited to fixed-voltage monitoring or reference; no cathode programming capability. | Choose only for fixed 1.25 V needs where ultra-low drift and tighter tolerance outweigh adjustability. |
Compared with TL431ACDBVR and MAX6008AEUR+T, the LMV431AIM5 uniquely balances low-voltage operation (1.24 V), fine 0.5% tolerance, and SOT-23-5 adjustability - making it optimal for modern low-voltage, high-precision feedback where space and thermal performance are constrained.
Availability
LMV431AIM5 is available at Aetrix Electronics and suitable for industrial power supplies, embedded voltage supervision, and DC-DC converter feedback requiring stable component supply across extended temperature ranges.
Supply support for LMV431AIM5 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 LMV431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained power management systems - targeting replacement of Zener diodes in feedback, monitoring, and error amplification roles.
FAQ
What is the operating temperature range of the LMV431AIM5?
The LMV431AIM5 is rated for industrial operation from −40°C to +85°C. This range is confirmed in the "Recommended Operating Conditions" table (Section 7.3) and "Device Information" packaging addendum, where LMV431AIM5X/NOPB.B is explicitly listed with "Op temp (°C): −40 to 85". Its 39 ppm/°C temperature coefficient ensures predictable reference drift within this envelope.
Can the LMV431AIM5 replace a standard Zener diode in a 3.3 V regulator feedback loop?
Yes, the LMV431AIM5 can directly replace a Zener diode in a 3.3 V feedback loop. With its 1.24 V reference and two-resistor divider, it achieves precise 3.3 V setpoint (e.g., R1 = 10 kΩ, R2 = 6.2 kΩ). Unlike Zeners, it offers 0.5% tolerance, 39 ppm/°C stability, and 0.25 Ω output impedance - significantly improving regulation accuracy and thermal performance in the LMV431AIM5-based design.
What is the minimum cathode current required for regulation in the LMV431AIM5?
The LMV431AIM5 requires a minimum cathode current of 55 µA to maintain regulation, as specified in the "LMV431AI Electrical Characteristics" table (Section 7.8, parameter IZ(MIN)). This value is guaranteed over the full −40°C to +85°C temperature range and enables reliable operation in ultra-low-power feedback networks where current budgets are tight.
Is the LMV431AIM5 stable with ceramic capacitive loads?
Yes, the LMV431AIM5 is stable with ceramic capacitive loads between 10 nF and 50 pF, as documented in the "Typical Application" section (Figure 19, Stability Boundary Condition) and "Features" list. This stability eliminates the need for series resistance or external compensation - a key advantage over many older shunt references that oscillate with small ceramics.
How does the LMV431AIM5 differ from the LMV431ACM5 in terms of specifications?
The LMV431AIM5 differs from the LMV431ACM5 primarily in temperature grade and tolerance: LMV431AIM5 is industrial-grade (−40°C to +85°C) with 0.5% initial tolerance (LMV431B-grade), while LMV431ACM5 is commercial-grade (0°C to +70°C) with 0.6% tolerance (LMV431A-grade). Both share identical SOT-23-5 packaging, 1.24 V reference, and 0.25 Ω output impedance - making the LMV431AIM5 the preferred choice for ruggedized applications.
LMV431AIM5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
LMV431AIM5 FAQ
1.How can I place an order for LMV431AIM5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431AIM5 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 LMV431AIM5 reliable?
The price and inventory of LMV431AIM5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431AIM5 is usually 5 days.
3.What payment methods are accepted for LMV431AIM5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431AIM5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431AIM5?
LMV431AIM5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431AIM5 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 LMV431AIM5?
For technical support, including LMV431AIM5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431AIM5 requirements.
6.How does Aetrix verify that LMV431AIM5 is sourced from the original manufacturer or authorized distributors?
All LMV431AIM5 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 LMV431AIM5 meets industry standards.
7.What is the process for return or replacement of LMV431AIM5?
All LMV431AIM5 units undergo pre-shipment inspection (PSI). If there is an issue with LMV431AIM5, 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 LMV431AIM5 part is unused and in its original packaging.
Return procedure for LMV431AIM5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431AIM5 Tags
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TL431AIDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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