): For high-frequency or RF applications, the new transistor must match or exceed the switching speed of the old one. Popular Transistor Numbering Systems
): The replacement transistor must have an equal or higher collector-emitter voltage rating than the original to prevent premature component failure. Continuous Collector Current ( ICcap I sub cap C all type transistor equivalent pdf
Replaced by BC547B, BC547C, 2N2222, 2N3904 . 2N3904: Replaced by BC547, BC548, 2N2222 . 2N2222 / 2N2222A: Replaced by BC547, PN2222 . BC337: Replaced by 2N2222, MPS650 . Common PNP Transistors (General Purpose) ): For high-frequency or RF applications, the new
: Because Surface Mount Devices (SMD) often use short codes rather than full part numbers, a codebook is essential. Use the SMD Codebook from Sos.sk to decode markings like "1A" (BC846A or 2N3904). Key Parameters for Finding Equivalents 2N3904: Replaced by BC547, BC548, 2N2222
Two letters followed by a sequence of characters (e.g., BC547, BD139).
): For high-frequency or RF applications, the new transistor must match or exceed the switching speed of the old one. Popular Transistor Numbering Systems
): The replacement transistor must have an equal or higher collector-emitter voltage rating than the original to prevent premature component failure. Continuous Collector Current ( ICcap I sub cap C
Replaced by BC547B, BC547C, 2N2222, 2N3904 . 2N3904: Replaced by BC547, BC548, 2N2222 . 2N2222 / 2N2222A: Replaced by BC547, PN2222 . BC337: Replaced by 2N2222, MPS650 . Common PNP Transistors (General Purpose)
: Because Surface Mount Devices (SMD) often use short codes rather than full part numbers, a codebook is essential. Use the SMD Codebook from Sos.sk to decode markings like "1A" (BC846A or 2N3904). Key Parameters for Finding Equivalents
Two letters followed by a sequence of characters (e.g., BC547, BD139).
