2SA1837(A) 2SA1837(A1837) 2SA1837(F 2SA1837(F) 2SA1837(F,M) 2SA1837(F.M) 2SA1837(F.M)/2SC4793(F 2SA1837(F.M)/2SC4793(F,M) 2SA1837(FM) 2SA1837(FM)/2SC4793(FM)