2N3906

The 2N3906 is a commonly used PNP bipolar junction transistor intended for general purpose low-power amplifying or switching applications.

[1][2] It is designed for low electric current and power and medium voltage, and can operate at moderately high speeds.

The 2N3906 is specified by a collector current of 200 mA, collector-base and collector-emitter voltages of 40 V, for power dissipation of 300 mW.

Its transition frequency Ft is 250 MHz, with a beta of at least 100.

[1] The 2N3904 (NPN) and 2N3906 (PNP) are complementary transistor pairs.

2N3906 transistors in plastic TO-92 packaging. The cases are marked with E, B, and C for lead identification.
Photomicrograph of the transistor chip inside a 2N3906 transistor package, showing the conductive metal layers used to connect the semiconductor junctions to the package leads. The upper-left and lower-right quadrants are bonding pad areas where wires for two of the terminals are attached, and the other two quadrants have the actual transistor structures, in a bulk region that is contacted at the back side of the chip to the third terminal.