I have a schematic of my mobile phone. when i saw in the schematic, i saw two odd component. look:


  • For number one: What are these both components? What's the usage of these?
  • For number two: Is it a transistor? What's the difference between this component and a transistor?

2 Answers 2


1 NTHS5441 Power MOSFET −20 V, −5.3 A, P−Channel ChipFET

2 UNRF2A1001 NPN junction transistor IC - transistor + internal resistors (appears to be obsolete device from Panasonic)

  • \$\begingroup\$ The part numbers "NTHS5441T1G" and "UNRF2A1001ER" shown on the schematic can be searched in Google and the manufacturer's data sheets show up. This is a handy technique any time you have an unknown component with part numbers on it. \$\endgroup\$ Commented Oct 18, 2013 at 20:21
  • \$\begingroup\$ How do you know these components? \$\endgroup\$
    – Roh
    Commented Oct 19, 2013 at 3:34

1 is a MOSFET

2 is a BJT (Bipolar Junction Transistor), what's commonly just named "transistor", but with integrated resistors. Usually you'll have to add these resistors externally.


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