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Transistor D998 B778 !!install!! | Persamaan

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Technical Report: D998 (NPN) and B778 (PNP) Transistor Pair

2SB778 2SD998 Audio amplifier transistor B778 D998 - Alibaba.com

2SD718 (NPN) & 2SB688 (PNP)

(Sangat populer dan mudah ditemukan) 2SD1047 (NPN) & 2SB817 (PNP)

  1. Tentukan parameter kerja rangkaian: tegangan suplai, arus puncak, daya disipasi maksimum.
  2. Pilih transistor pengganti dengan Vce(max) ≥ 2× tegangan suplai puncak (untuk margin), Ic(max) ≥ arus puncak dan Pd sesuai.
  3. Cocokkan hFE pada arus operasi; jika perlu, sesuaikan biasing.
  4. Verifikasi mekanik—paket, mounting hole, isolasi listrik.
  5. Uji pada beban simulasi dengan pengukuran suhu dan distorsi sebelum memasang di sistem akhir.

The D998 and B778 function as a "push-pull" pair, where the NPN (D998) handles the positive half of the signal cycle and the PNP (B778) manages the negative half. This configuration is essential for Class AB amplifiers, as it balances current flow and significantly reduces harmonic distortion. Key shared specifications include:

persamaan (substitute/equivalents)

Oleh karena itu, menggunakan dari merek ternama seperti Toshiba, Sanken, atau Fairchild adalah solusi paling rasional.