The KT315 is a Soviet silicon NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications, enclosed in the plastic KT-13 package.

The KT361 is a complementary (PNP) for the KT315 transistor, so it was often paired with it in push-pull stages.

The process of manufacturing was much cheaper than the alloy-junction technology, and the parameters surpassed those of earlier transistor types, in particular, the unity-gain frequency was 250 MHz.

The people associated with the development and mass-production launch of the KT315 were awarded the USSR State Prize for it in 1973.

[1][2] KT315 transistors were designed for use in high-, medium- and sound-frequency amplifying stages.