Transistor aslinya adalah tipe lama yang sudah langka di pasaran lokal. Mencari pengganti yang original bagaikan mencari jarum di tumpukan jerami. Saya memutuskan untuk menggunakan substitute (pengganti) yang lebih modern dan tangguh.
These are Darlington transistors (built-in driver and power transistor). Do not replace them with standard single BJTs. persamaan transistor d998 b778 install
| Mistake | Consequence | | :--- | :--- | | Using non-Darlington transistors | Oscillation, distortion, immediate failure | | Replacing only one channel | Mismatched gain, channel imbalance | | Forgetting thermal paste | Overheating, thermal runaway | | Swapping NPN/PNP positions | Short circuit (reverse polarity) | | Using substitutes with lower Vceo | Breakdown on high voltage peaks | Transistor aslinya adalah tipe lama yang sudah langka
These transistors are designed to work together in a push-pull configuration. The is an NPN transistor, while the B778 is its PNP counterpart. Key Specifications (Reference): Voltage (Vceo): 120V Current (Ic): 10A These are Darlington transistors (built-in driver and power
Both transistors share similar absolute maximum ratings to ensure balanced performance in a push-pull circuit: Parameter 2SD998 (NPN) 2SB778 (PNP) 120V (Min) -120V (Min) Collector Current ( ICcap I sub cap C ) 10A (Continuous) -10A (Continuous) Collector Power Dissipation ( PCcap P sub cap C ) DC Current Gain ( hFEh sub cap F cap E end-sub ) 55 – 160 55 – 160 Package Type TO-3PML / TO-3P TO-3PML / TO-3P Pinout Diagram (Front View)
These transistors are designed for high-voltage and high-current environments, making them ideal for driving 45–50W audio systems. D998 (NPN) B778 (PNP) Silicon NPN Power Silicon PNP Power Package TO-3P / TO-3PML TO-3P / TO-3PML Max Voltage (Vceo) Max Current (Ic) Power Dissipation (Pc) Current Gain (hFE) 55 – 160 80 – 160 Installation Guide