This post explains for the Regulator.

The Part Number is 7812A, MC7812A.

The function of this semiconductor is 12V, Voltage Regulator.

The package is TO-220, D2Pak Type

Manufacturer: ON Semiconductor

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Description

7812A is 1A, 12V, Positive Voltage Regulator.

These voltage regulators are monolithic integrated circuits designed as fixed−voltage regulators for a wide variety of applications including local, on−card regulation. These regulators employ internal current limiting, thermal shutdown, and safe−area compensation. With adequate heatsinking they can deliver output currents in excess of 1.0 A. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents.

Block Diagram:

Features:

• Output Current in Excess of 1.0 A

• No External Components Required

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting

• Output Transistor Safe−Area Compensation

• Output Voltage Offered in 2% and 4% Tolerance

• NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes

• Pb−Free Packages are Available

7812A PDF Datasheet

Part Number: APL5607KI

Function: 600mA, Linear Regulator for DC Fan Speed Control

Package: SOP-8 and TDFN3x3-8 Type

Manufacturer: ANPEC

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Description

The APL5607KI is a low quiescent current and low dropout linear regulator which is designed to power a DC fan and deliver up to 600mA output current. The output voltage follows the 1.6 times of VSET voltage and typical dropout voltage is only 220mV (typical) at 600mA output current. The APL5607/A with low 140µA quiescent current is ideal for battery-powered system appliances and stable with a 2.2µF ceramic output capacitor. The features of current-limit (with foldback current) and overtemperature protection protect the device against current over-loads and over temperature.

 

Features:

• Low Dropout Voltage: 220mV (Typical) @ 600mA

• Low Quiescent Current: 140µA

• Enable/Shutdown Function

• Output Voltage / VSET Voltage: 1.6 Times

• Stable with Low ESR Ceramic Capacitors

• Over-Temperature Protection

• Current-Limit Protection with Foldback Current

• Internal Soft-Start

• Lead Free and Green Devices Available (RoHS Compliant)

Applications:

• Notebook Fan Driver

• Motherboards

• PC Peripherals

• Battery-Powered System

 

APL5607KI PDF Datasheet