LM431SACM3X

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

Characteristics: - Adjustable Precision Shunt Regulator - Programmable Output Voltage - Low Dynamic Output Impedance - Wide Operating Current Range - Low Temperature Coefficient - Fast Turn-On Response

Package: SOT-23-3

Essence: The LM431SACM3X is a precision shunt regulator that can be used to provide a stable reference voltage. It is commonly used in various electronic circuits where a precise voltage reference is required.

Packaging/Quantity: The LM431SACM3X is available in a SOT-23-3 package, which is a small surface-mount package. It is typically sold in reels or tubes containing a specified quantity of units.

Specifications

• Reference Voltage Range: 2.495V to 36V
• Operating Current Range: 1mA to 100mA
• Temperature Coefficient: 50ppm/°C
• Dynamic Output Impedance: 0.25Ω
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM431SACM3X has three pins:

1. Anode (A): Connected to the positive supply voltage.
2. Cathode (K): Connected to the load or ground.
3. Reference (R): Provides the stable reference voltage.

Functional Features

• Adjustable Output Voltage: The LM431SACM3X allows for programmable output voltage, making it versatile for different applications.
• Precision Voltage Reference: It provides a stable and accurate reference voltage, ensuring reliable performance in various electronic circuits.
• Low Dynamic Output Impedance: The low output impedance ensures minimal voltage drop even under varying load conditions.
• Wide Operating Current Range: The LM431SACM3X can operate within a wide current range, providing flexibility in different circuit designs.
• Low Temperature Coefficient: It exhibits a low temperature coefficient, ensuring minimal voltage drift with temperature changes.
• Fast Turn-On Response: The LM431SACM3X has a fast turn-on response time, making it suitable for applications requiring quick voltage stabilization.

Advantages and Disadvantages

Advantages: - Precise and stable voltage reference - Adjustable output voltage - Wide operating current range - Low temperature coefficient - Fast response time

Disadvantages: - Limited maximum reference voltage (up to 36V) - Requires external components for certain applications

Working Principles

The LM431SACM3X operates as a shunt regulator. It compares the reference voltage at the Reference pin with the voltage across the load connected to the Cathode pin. By adjusting the resistance between the Anode and Cathode pins, the output voltage can be programmed to a desired value. The LM431SACM3X maintains a constant voltage drop across its terminals, ensuring a stable reference voltage.

Detailed Application Field Plans

The LM431SACM3X finds applications in various fields, including but not limited to: 1. Voltage regulation in power supplies 2. Battery charging circuits 3. Precision instrumentation 4. Audio amplifiers 5. Voltage monitoring circuits 6. Switching power converters 7. LED drivers 8. Automotive electronics

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to the LM431SACM3X are: 1. TL431AIDBZR 2. LT1009CZ-1.2 3. MAX6126AASA25 4. REF5025AIDGKT 5. AD780BRZ

These models offer similar functionality and can be used as substitutes depending on specific requirements.

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