L78L33ABZ-AP

Product Overview

Category

The L78L33ABZ-AP belongs to the category of voltage regulators.

Use

It is primarily used for regulating voltage in electronic circuits.

Characteristics

• Input Voltage Range: 4.75V to 35V
• Output Voltage: 3.3V
• Maximum Output Current: 100mA
• Dropout Voltage: 1.7V (typical)
• Operating Temperature Range: -40°C to +125°C
• Package Type: TO-92
• Essence: Linear voltage regulator

Packaging/Quantity

The L78L33ABZ-AP is available in a TO-92 package and is typically sold in reels or tubes containing a specific quantity of units.

Specifications

The specifications of the L78L33ABZ-AP are as follows:

• Input Voltage Range: 4.75V to 35V
• Output Voltage: 3.3V
• Output Current: 100mA (maximum)
• Dropout Voltage: 1.7V (typical)
• Line Regulation: ±50mV
• Load Regulation: ±100mV
• Quiescent Current: 5mA (typical)
• Ripple Rejection Ratio: 60dB (typical)
• Thermal Shutdown Protection: Yes
• Short Circuit Protection: Yes

Pin Configuration

The L78L33ABZ-AP has three pins, which are labeled as follows:

1. Input (Vin): This pin is used to connect the input voltage.
2. Ground (GND): This pin is connected to the ground reference.
3. Output (Vout): The regulated output voltage is obtained from this pin.

Functional Features

The L78L33ABZ-AP offers the following functional features:

• Regulates the input voltage to a stable 3.3V output.
• Provides protection against thermal shutdown and short circuits.
• Low dropout voltage ensures efficient regulation even with low input voltages.
• Good ripple rejection ratio minimizes the impact of noise on the output.

Advantages and Disadvantages

Advantages

• Simple and easy to use.
• Compact TO-92 package allows for space-efficient integration into circuits.
• Wide input voltage range provides flexibility in various applications.
• Thermal shutdown and short circuit protection enhance reliability.

Disadvantages

• Limited maximum output current (100mA).
• Dropout voltage may cause inefficiency in certain low voltage applications.

Working Principles

The L78L33ABZ-AP is a linear voltage regulator that operates by comparing the output voltage to a reference voltage. It adjusts the resistance in the circuit to maintain a constant output voltage, regardless of changes in the input voltage or load conditions. The internal circuitry of the regulator ensures stability and protection against thermal overload and short circuits.

Detailed Application Field Plans

The L78L33ABZ-AP finds application in various electronic devices and systems, including but not limited to:

1. Battery-powered devices: Provides regulated power supply for microcontrollers, sensors, and other low-power components.
2. Automotive electronics: Used in automotive modules, such as infotainment systems, dashboard displays, and lighting control circuits.
3. Industrial automation: Suitable for powering control boards, sensors, and actuators in industrial machinery and equipment.
4. Consumer electronics: Can be utilized in portable devices, audio amplifiers, and small-scale power supplies.

Detailed and Complete Alternative Models

1. LM1117-3.3: Similar voltage regulator with higher output current capability (up to 800mA).
2. AMS1117-3.3: SMD package alternative with similar specifications.
3. NCP1117-3.3: Low dropout voltage regulator with adjustable output voltage.

These alternative models offer similar functionality and can be considered as substitutes for the L78L33ABZ-AP in various applications.

In conclusion, the L78L33ABZ-AP is a linear voltage regulator that provides stable 3.3V output voltage with a wide input voltage range. Its compact package, thermal protection, and short circuit protection make it suitable for diverse electronic applications. However, its limited output current and dropout voltage should be taken into consideration when selecting this regulator for specific projects.