2SB1218A-R-TX 2SB1218AR-TX 2SB1218ARTX+ 2SB1218AS 2SB1218A-S 2SB1218AS /BS 2SB1218A-S /B_S 2SB1218A-S(TW) 2SB1218AS(TX) 2SB1218A-S(TX)