S9014 is a very common NPN transistor used in electronics for amplification and switching.
Basic Description
Type: NPN Bipolar Junction Transistor (BJT)
Package: TO-92 (through-hole)
Used for: low-signal amplification & general switching
 
Pin Configuration
(Flat side facing you, legs down)
Emitter (E)
Base (B)
Collector (C)
 
Key Specifications
Collector-Emitter Voltage (Vce): ≈ 45V
Collector Current (Ic): 100 mA max
Power Dissipation: ≈ 400–450 mW
Gain (hFE): 60 – 1000 (high gain)
Frequency: ~150–270 MHz
 
Features
Low noise transistor
High current gain
Good for small signals (not high power)
 
Common Uses
Audio amplifiers (pre-amplifier stages)
Signal amplification circuits
Small switching applications
Low-power electronic devices
 
Complementary Transistor
Works with S9015 (PNP) in amplifier circuits
 
⚠️ Important Note
Not suitable for heavy loads (motors, relays directly) because it only handles up to 100 mA.