https://www.chipdip.ru/product/kt819a

Structure	npn
Max. ex. kB for a given reverse current k and an open circuit, e (Ukbo max), B	40
The maximum permissible current k (Ik max. A)	10
Static current transfer coefficient h21 min	15
Boundary frequency of the current transfer coefficient fg.MHz	3
Maximum power dissipation, W	1.5
Housing	kt-28



https://www.chipdip.ru/product/kt819b
Technical specifications
Structure	npn
Max. ex. kB for a given reverse current k and an open circuit, e (Ukbo max), B	50
The maximum permissible current k (Ik max. A)	10
Static current transfer coefficient h21 min	20
Boundary frequency of the current transfer coefficient fg.MHz	3
Maximum power dissipation, W	1.5
Housing	kt-28