Transistors Datasheets

The A42 (often labeled as MPSA42 or MMBTA42 in surface-mount) is a high-voltage, low-current NPN bipolar junction transistor (BJT). It is primarily used as a general-purpose amplifier and electronic switch in circuits that require high-voltage handling.

The A733 (often written as the 2SA733) is a general-purpose PNP bipolar junction transistor (BJT) designed for low-frequency audio amplification and medium-speed switching applications. It is widely used in complementary pairs (like the NPN C945) for driver stages in low-power audio circuits.

The A92 (often designated as MPSA92) is a high-voltage PNP bipolar junction transistor (BJT). It is highly prized in electronics for its ability to switch and amplify loads up to -300V, making it a standard choice for high-voltage driver circuits, audio amplifiers, and telecommunication equipment.