Ordering number:EN2836 NPN Triple Diffused Planar.
C3991 - 2SC3991
2SC3991 - Silicon NPN Transistor
PI6C3991 - Low-Voltage Programmable Skew Clock Buffer
2SC3991 - Silicon NPM Power Transistor
PI6C39911 - 3.3V High Speed LVTTL or Balanced Output Programmable Skew Clock Buffer