This post explains for the Voltage Regulator.

The Part Number is 7808, KA7808, MC7808AC, MC7808C.

The function of this semiconductor is 3-Terminal, 1A, 8V, Positive Voltage Regulator.

The package is TO-220, D-Pak Type

Manufacturer: Fairchild Semiconductor, Motorola

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Description

The KA7808 / KA78 8A / 7808 series of three-terminal positive regulator are available in the TO-220/D-PAK package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut down and safe operating area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents.

Features

1. Output Current up to 1A

2. Output Voltages of 8 V

3. Thermal Overload Protection

4. Short Circuit Protection

5. Output Transistor Safe Operating Area Protection

7808 PDF Datasheet

A step-down regulator, also known as a buck regulator, is a type of voltage regulator used in electronics to efficiently convert a higher input voltage to a lower output voltage. It’s a fundamental component in power management systems, ensuring that devices receive a stable and appropriate voltage level for their operation.

Part Number: SY8089, SY8089AAC, SY8089AAAC

Function: 5.5V, 2A, Synchronous Step Down Regulator

Package: SOT23-5 Type

Manufacturer: Silergy

Images:

Description

The SY8089 and SY8089A are high-efficiency, high frequency synchronous step-down DC-DC regulator IC capable of delivering up to 2A output current. The devices operate over a wide input voltage range from 2.7V to 5.5V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

Low output voltage ripple and small external inductor and capacitor sizes are achieved with greater than 1MHz switching frequency. […]

Features

• Low RDS(ON) for internal switches (top/bottom):110mΩ/80mΩ

• 2.7-5.5V input voltage range

• 2A continuous, 3A peak load current capability

• 1MHz switching frequency minimizes the external components

• Internal softstart limits the inrush current

Applications:

• CD TV

• Set Top Box

• Net PC

• Mini-Notebook PC

• Access Point Router

SY8089 PDF Datasheet