2N5401 PNP Amplifier Transistor, TO-92 (5-Piece Pack)

The 2N5401 fills the PNP side of the high-voltage small-signal transistor pairing that the 2N5551 covers on the NPN side, both rated well above the 40-45V ceiling of everyday general-purpose transistors. Keeping this pair on hand covers complementary switching and amplification circuits that run at a higher working voltage than standard parts like the BC547/BC557 pair can handle, letting a design follow a schematic calling for this exact higher-voltage complementary pair without having to substitute lower-rated parts and risk exceeding their voltage limits.