Most D998 and B778 transistors use the package with the following pinout (looking at the front face):
For audio quality, buy matched pairs or measure hFE. Original parts had hFE range 40–140. Modern equivalents (e.g., 2SC5200) are typically 55–160. Close matching between NPN and PNP reduces distortion. Persamaan Transistor D998 B778
The and 2SB778 (PNP) are a complementary pair of power transistors widely used in audio power amplifiers , particularly in the output stages of high-fidelity (Hi-Fi) stereo systems, home theater receivers, and professional PA amplifiers. Known for their high current handling and wide Safe Operating Area (SOA), this pair has become a standard in many Japanese-brand amplifiers from the 1980s–2000s (e.g., Pioneer, Kenwood, Technics, and Sansui). Most D998 and B778 transistors use the package
Jika Anda membaca datasheet, hFE original D998 adalah R(55-110), O(70-140), Y(110-220). Untuk C5200, pilih yang kode atau Y . Saran: Beli 5 pasang sekaligus, lalu ukur hFE dengan multimeter transistor. Pasangkan yang nilai hFE nya paling dekat (beda maksimal 5%). Close matching between NPN and PNP reduces distortion
Karena bekerja dengan daya tinggi (80W+), pastikan menggunakan silicone grease atau pasta thermal saat memasangnya ke heatsink .
Kelima pasangan di atas menggunakan kemasan TO-264 atau TO-3P yang sama dengan D998/B778. Anda tidak perlu merubah lubang PCB.