2N3904S-PTK 2N3904S-PTK/PS 2N3904SRTK 2N3904S-RTK 2N3904S-RTK(ZC) 2N3904S-RTK/H 2N3904S-RTK/P 2N3904S--RTK/P 2N3904S-RTK/P / ZC 2N3904S-RTK/P 1A