This post explains for the FET.
The Part Number is 55N03LTA.
The function of this semiconductor is Logic Level FET.
The package is SOT-78, SOT-404, SOT-428 Type.
Manufacturer: Philips
Preview images :
1 page
Description
N-channel logic level field-effect power transistor in a plastic package using TrenchMOS technology.
Product availability :
1. PHP55N03LTA in a SOT78 (TO-220AB)
2. PHB55N03LTA in a SOT404 (D2-PAK)
3. PHD55N03LTA in a SOT428 (D-PAK).
Features
1. Low on-state resistance
2. Fast switching.
Absolute Maximum Ratings (Ta = 25°C)
1. Drain to source voltage: VDSS = 25 V
3. Drain current: ID = 55 A
4. Total Power Dissipation: Pd = 85 W
5. Channel temperature: Tch = 175 °C
6. Storage temperature: Tstg = -55 to +175 °C
Applications
1. Computer motherboard high frequency DC to DC converters.
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Other data sheets are available within the file: PHP55N03LTA, PHB55N03LTA, PHD55N03LTA