L78M08ABDT-TR

Product Overview

Category

L78M08ABDT-TR belongs to the category of voltage regulators.

Use

It is primarily used for regulating and stabilizing voltage in electronic circuits.

Characteristics

• Input Voltage Range: 10V to 35V
• Output Voltage: 8V
• Maximum Output Current: 500mA
• Dropout Voltage: 2V (typical)
• Operating Temperature Range: -40°C to +125°C
• Package Type: DPAK (TO-252)

Essence

The L78M08ABDT-TR is an integrated circuit voltage regulator that provides a fixed output voltage of 8V. It is designed to be used in various electronic applications where a stable and regulated power supply is required.

Packaging/Quantity

The L78M08ABDT-TR is available in a DPAK (TO-252) package. It is typically sold in reels or tubes containing a specific quantity, such as 2500 units per reel.

Specifications

• Input Voltage Range: 10V to 35V
• Output Voltage: 8V
• Output Current: Up to 500mA
• Dropout Voltage: 2V (typical)
• Line Regulation: ±0.4%
• Load Regulation: ±1%
• Quiescent Current: 6mA (typical)
• Ripple Rejection Ratio: 62dB (typical)
• Thermal Shutdown Protection: Yes
• Short Circuit Protection: Yes

Pin Configuration

The L78M08ABDT-TR has three pins:

1. INPUT (Pin 1): This pin is connected to the input voltage source.
2. GROUND (Pin 2): This pin is connected to the ground reference.
3. OUTPUT (Pin 3): This pin provides the regulated output voltage of 8V.

Functional Features

• Voltage Regulation: The L78M08ABDT-TR ensures a stable and regulated output voltage of 8V, regardless of input voltage fluctuations.
• Thermal Shutdown Protection: It incorporates a thermal shutdown mechanism to prevent overheating and damage to the device.
• Short Circuit Protection: The regulator is equipped with short circuit protection, which safeguards against excessive current flow and potential damage.

Advantages and Disadvantages

Advantages

• Compact Size: The DPAK package offers a small form factor, making it suitable for space-constrained applications.
• Wide Input Voltage Range: The L78M08ABDT-TR can accept input voltages ranging from 10V to 35V, providing flexibility in various power supply scenarios.
• High Ripple Rejection Ratio: The regulator exhibits excellent performance in rejecting ripple and noise present in the input voltage.

Disadvantages

• Limited Output Current: The maximum output current of 500mA may not be sufficient for high-power applications.
• Dropout Voltage: The dropout voltage of 2V may result in a higher minimum input voltage requirement compared to other regulators.

Working Principles

The L78M08ABDT-TR operates based on the principle of linear voltage regulation. It utilizes a series pass transistor to regulate the output voltage by adjusting the resistance between the input and output terminals. The internal circuitry compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a constant output voltage of 8V.

Detailed Application Field Plans

The L78M08ABDT-TR finds applications in various electronic systems that require a stable and regulated 8V power supply. Some common application fields include:

1. Consumer Electronics: Used in audio/video equipment, set-top boxes, and gaming consoles.
2. Industrial Automation: Employed in control systems, motor drives, and power management modules.
3. Automotive Electronics: Used in automotive infotainment systems, lighting controls, and engine management units.
4. Telecommunications: Utilized in network routers, switches, and communication equipment.

Detailed and Complete Alternative Models

1. LM7808: A popular alternative from Texas Instruments with similar specifications and pin configuration.
2. MC78M08: An alternative from ON Semiconductor offering comparable performance and compatibility.
3. UA78M08: Another alternative from Fairchild Semiconductor that provides a fixed 8V output voltage.

These alternative models can be considered based on specific requirements and availability.

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