Patent ID: 8860233

Claim:
A semiconductor unit, comprising a molded product of a semiconductor element and peripheral wirings resin-encapsulated with a semiconductor device encapsulant, the semiconductor device encapsulant comprising 100 parts by weight of a synthetic resin (A), 10 to 400 parts by weight of a carbon precursor (B) having a volume resistivity of 10 2 to 10 10 Ω·cm, 5 to 60 parts by weight of a conductive filler (C) having a volume resistivity lower than 10 2 Ω·cm, and 200 to 1500 parts by weight of another filler (D), wherein (i) the synthetic resin (A) is an epoxy resin component containing an epoxy compound having at least 2 epoxy groups in its molecule, and a curing agent, (ii) the conductive filler (C) is carbon fiber, graphite, conductive carbon black or mixtures thereof, (iii) the other filler (D) is silica filler, (iv) a total proportion of the fillers composed of the carbon precursor (B), the conductive filler (C), and the other filler (D) is 70 to 93% by weight of the total weight of the semiconductor device encapsulant, and (v) a surface resistivity of the semiconductor unit is 10 6 to 10 12 Ω/□.