This post explains for the MOSFET.
The Part Number is 45N03LT, PHP45N03LT.
The function of this semiconductor is 30V, 45A, MOSFET.
The package is TO-220AB Type
Manufacturer: Philips Semiconductors
Preview images :
This is TrenchMOS transistor Logic level FET.
N-channel enhancement mode logic level field-effect power transistor in a plastic envelope
using ’trench’ technology. The device has very low on-state resistance. It is intended for use in
dc to dc converters and general purpose switching applications. […]
• ’Trench’ technology
• Very low on-state resistance
• Fast switching
• Stable off-state characteristics
• High thermal cycling performance
• Low thermal resistance