http://www.semiconductors.philips.com/pip/PHP45N03LT.html:

General description

N-channel enhancement mode logic level field-effect powertransistor in a plastic envelope using 'trench' technology. Thedevice has very low on-state resistance. It is intended for use indc to dc converters and general purpose switching applications.

The PHP45N03LT is supplied in theSOT78 (TO220AB) conventionalleaded package.





Features

'Trench' technology
Very low on-state resistance
Fast switching
Stable off-state characteristics
High thermal cycling performance
Low thermal resistance