This is one of the types of MOSFETs and is a kind of transistor.

Part Number: LR8726, IRLR8726PbF

Function: Vdss=30V, HEXFET Power MOSFET

Package: D-Pak Package

Manufacturer: International Rectifier, Infineon

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Applications

1. High Frequency Synchronous Buck Converters for Computer Processor Power
2. High Frequency Isolated DC-DC Converters with Synchronous Rectification for Telecom and Industrial Use

 

Pinout

 

Features

1. Very Low RDS(on) at 4.5V VGS
2.  Ultra-Low Gate Impedance
3.
Fully Characterized Avalanche Voltage and Current
4.  Lead-Free
5.
RoHS compliant

 

LR8726 Pinout Datasheet

 

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Part Number: IRFZ34NL, IRFZ34NS, IRFZ34

Function: Vdss=55V, HEXFET Power MOSFET

Package : TO-262, D2Pak type

Manufacturer: IRF -> Infineon Technologies

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Description

Fifth Generation HEXFETs from International Rectifier utilize advanced processing techniques to achieve extremely low on-resistance per silicon area. This benefit, combined with the fast switching speed and ruggedized device design that HEXFET Power MOSFETs are well known for, provides the designer with an extremely efficient and reliable device for use in a wide variety of applications.
The D2Pak is a surface mount power package capable of accommodating die sizes up to HEX-4. It provides the highest power capability and the lowest possible onresistance in any existing surface mount package. The D2Pak is suitable for high current applications because of its low internal connection resistance and can dissipate up to 2.0W in a typical surface mount application. The through-hole version  ( IRFZ34NL ) is available for lowprofile applications.

Pinout

Features

1. Advanced Process Technology
2. Surface Mount (IRFZ34NS)
3. Low-profile through-hole (IRFZ34NL)
4. 175°C Operating Temperature
5. Fast Switching
6. Fully Avalanche Rated

 

IRFZ34NL PDF Datasheet Download