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

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Quick Facts КТ315 А...И, Structure ...

КТ315 А...И
Structure	n-p-n
Uce	15–60 V
Ube	6 V
Ic	50–100 mA
Ib	50 mA
P	100 mW
Pmax	150 mW
Tmax, °C	up to 100 °C
fT	250 MHz
h21e	20–350

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KT315 and KT361 transistors became the first^[when?] in the USSR, which were produced using planar technology. The characteristics achieved in the KT315 were groundbreaking in Soviet technology at that time. 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.

• 2N3904 — NPN transistor with slightly better specifications than KT315. Usually can be used as a replacement.
• 2N3906 — PNP transistor with slightly better specifications than KT361. Usually can be used as a replacement.
• Bipolar junction transistor