D998 (2SD998) B778 (2SB778) are a popular complementary pair of silicon power transistors widely used in the output stages of high-power audio amplifiers. They are typically recommended for amplifiers delivering roughly 45W to 50W of output power. Core Specifications Overview 2SD998 (NPN) 2SB778 (PNP) Max Voltage ( cap V sub cap C cap E cap O end-sub Collector Current ( cap I sub cap C Power Dissipation ( cap P sub cap C TO-3P / TO-3PML TO-3P / TO-3PML DC Current Gain ( h sub cap F cap E end-sub 55 – 160 80 – 160 Common Equivalents (Persamaan)
The (NPN) and 2SB778 (PNP) are a complementary high-power transistor pair developed primarily for audio power amplifier output stages . Manufactured by Sanyo (now part of ON Semiconductor), these devices were widely used in high-fidelity (Hi-Fi) stereo amplifiers, public address systems, and industrial power drivers during the late 1980s through the 2000s.
Jika ingin power amplifier bekerja lebih dingin dan awet, menggunakan transistor pengganti berkapasitas arus atau daya lebih besar sangat disarankan:
cases, which include a metal tab for mounting to a heatsink to manage high power dissipation. Specification NPN (2SD998) / PNP (2SB778) Max Collector-Emitter Voltage ( cap V sub cap C cap E cap O end-sub Max Collector Current ( cap I sub cap C Collector Power Dissipation ( cap P sub cap C 80W - 100W DC Current Gain ( h sub cap F cap E end-sub 60 - 160 (High Linearity) Frequency ( f sub cap T Common Equivalents and Replacements
| Parameter | 2SD998 (NPN) | 2SB778 (PNP) | | :--- | :--- | :--- | | Collector-Base Voltage (V CBO ) | 160 V | 160 V | | Collector-Emitter Voltage (V CEO ) | 140 V | 140 V | | Emitter-Base Voltage (V EBO ) | 5 V | 5 V | | Collector Current (I C ) – DC | | 15 A | | Collector Current – Peak | 25 A | 25 A | | Power Dissipation (P C ) @ T c =25°C | 150 W | 150 W | | Junction Temperature (T j ) | 150°C | 150°C | Persamaan Transistor D998 B778
Jika mengganti transistor di blok audio, sangat disarankan untuk mengganti keduanya (NPN dan PNP) dengan tipe persamaan yang sama agar karakter suaranya tetap seimbang.
Transistor 2SD998 (NPN) dan 2SB778 (PNP) merupakan pasangan komplementer ( matching pair ) yang sangat populer digunakan pada modul power amplifier kendaraan (audio mobil), penguat instrumen, serta sistem audio rumah tangga dengan daya menengah sekitar 45W hingga 50W.
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 NPN (untuk D998) | Persamaan PNP (untuk B778) | Keunggulan | | :--- | :--- | :--- | | | 2SA1943 | Paling populer (Toshiba). Suara jernih, mudah dicari, harga terjangkau. | | 2SC5242 | 2SA1962 | Fairchild/ON Semi. Vceo lebih tinggi (230V), lebih tahan overvoltage. | | 2SD1047 | 2SB817 | Sanken. Untuk subwoofer, bass lebih padat. | | 2SC3281 | 2SA1302 | Toshiba lawas (legacy). Kualitas audio high-end. | D998 (2SD998) B778 (2SB778) are a popular complementary
Both transistors use the (Sanyo’s large, insulated power package) or sometimes TO-3P/TO-247 variants, though the classic Sanyo MT-200 is most common.
Transistor dan B778 adalah pasangan transistor daya silikon ( power transistor ) yang sering digunakan dalam rangkaian penguat audio mobil ( power car audio ). Keduanya bekerja sebagai pasangan komplementer, di mana D998 (2SD998) adalah jenis NPN dan B778 (2SB778) adalah jenis PNP .
Jika Anda kesulitan menemukan seri D998 atau B778 yang asli, Anda dapat menggunakan beberapa tipe berikut yang memiliki karakteristik serupa atau bahkan lebih kuat: NPN: 2SD718, 2SD1047, TIP35C. PNP: 2SB688, 2SB817, TIP36C. Pilihan "Upgrade" (Lebih Tahan Panas/Tegangan): NPN: 2SC5200 (Sering digunakan sebagai pengganti premium). PNP: 2SA1943. Seri TIP: NPN: TIP35C (100V, 25A, 125W). PNP: TIP36C (100V, 25A, 125W). 3. Konfigurasi Pin (Pinout)
The are legacy complementary transistors suited for medium-power audio applications. While they are becoming obsolete in new designs, they are common in the repair industry. Manufactured by Sanyo (now part of ON Semiconductor),
Transistor daya seperti D998/B778 sangat banyak versi KW/palsu di pasaran. Pastikan membeli dari distributor komponen yang terpercaya atau pilih merek ternama seperti Toshiba atau ON Semiconductor untuk seri penggantinya.
| Kode Transistor | Tipe | Sumber | |---|---|---| | 2SA1106 | PNP | EL-Component, Motorobit | | 2SA1146 | PNP | EL-Component, Motorobit | | 2SA1186 | PNP | EL-Component, Motorobit | | 2SA1265 | PNP | EL-Component, Motorobit | | 2SA1301 / 2SA1302 / 2SA1303 | PNP | Motorobit, Yoreparo | | 2SA1386 / 2SA1386A | PNP | Motorobit | | 2SA1491 / 2SA1492 | PNP | Yoreparo, Motorobit | | 2SA1516 | PNP | Motorobit | | 2SA1695 / 2SA1941 / 2SA1942 / 2SA1943 | PNP | Motorobit, Yoreparo | | 2SA1986 | PNP | Motorobit | | 2SA2151 | PNP | Motorobit | | FJA4210 | PNP | Motorobit | | KTA1943 | PNP | Motorobit | | MJW1302A | PNP | Motorobit | | NTE37 | PNP | Yoreparo | | KTB688 / B688 | PNP | Yoreparo | | BD246C | PNP | Forum ElectronicWerkstatt |
+Vcc (+50V to +70V) | R1 (0.22Ω/5W) | C (2SD998) | Driver Stage (NPN) --- B (D998) E --- to Speaker (via relay) | B (B778) E --- to Speaker | Driver Stage (PNP) --- C (2SB778) | R2 (0.22Ω/5W) | -Vcc (-50V to -70V)