AP431SAZTR-G1

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Reference
• Characteristics: Precision, Low Dropout, Adjustable Output
• Package: SOT-23-3
• Essence: Provides a stable voltage reference for various electronic applications
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Reference Voltage Range: 1.24V to 16V
• Initial Accuracy: ±0.5%
• Temperature Coefficient: ±50 ppm/°C
• Dropout Voltage: 0.4V (typical) at 100mA load current
• Quiescent Current: 120µA (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The AP431SAZTR-G1 is a three-pin device with the following pin configuration:

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

Functional Features

• Adjustable Output: The AP431SAZTR-G1 allows users to adjust the output voltage within the specified range.
• Low Dropout: It exhibits a low dropout voltage, ensuring efficient operation even with small input-output differentials.
• Precision: With an initial accuracy of ±0.5%, it provides a highly precise voltage reference.
• Temperature Stability: The temperature coefficient of ±50 ppm/°C ensures stability over a wide temperature range.

Advantages and Disadvantages

Advantages

• Wide reference voltage range allows flexibility in various applications.
• Low quiescent current minimizes power consumption.
• Small package size enables space-saving designs.
• Adjustable output voltage suits different circuit requirements.

Disadvantages

• Limited output current capability.
• Requires external components for precise voltage adjustment.

Working Principles

The AP431SAZTR-G1 is a shunt voltage reference IC that operates by comparing the reference voltage (Vref) with an adjustable resistor divider network connected to the ADJ pin. By adjusting the resistance, the output voltage can be set within the specified range. The internal amplifier compares the Vref with the divided voltage and adjusts the current flowing through the shunt regulator to maintain a stable output voltage.

Detailed Application Field Plans

The AP431SAZTR-G1 finds applications in various electronic systems, including but not limited to:

1. Power Supplies: Provides a stable voltage reference for linear regulators, switching power supplies, and battery chargers.
2. Industrial Control Systems: Used as a voltage reference in control circuits, sensor interfaces, and analog-to-digital converters.
3. Automotive Electronics: Ensures accurate voltage references in automotive control modules, lighting systems, and infotainment systems.
4. Consumer Electronics: Suitable for use in audio/video equipment, televisions, and portable devices requiring precise voltage references.

Detailed and Complete Alternative Models

1. TL431: A popular alternative with similar specifications and pin configuration.
2. LM4040: Offers fixed voltage references with high precision and low temperature coefficient.
3. REF3030: Provides a wide input voltage range and low dropout voltage for demanding applications.

These alternative models offer comparable performance and can be considered based on specific application requirements.

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