2SC4639 2SC4639(VT6/VT7) 2SC4639-5-TB-E 2SC4639-5-TB-E TEL:88834448 2SC4639-6-TA 2SC4639-6-TB 2SC4639-6-TB-E 2SC4639-7 2SC4639-7-TB 2SC4639-TL-E