表面贴装型GDT 3SDH4-[ ] 3SDH4-75 3SDH4-90 3SDH4-145 3SDH4-200 3SDH4-230 3SDH4-350 SDH4-[ ] SDH4-75 SDH4-90 SDH4-145 SDH4-200 SDH4-230 SDH4-350