Reduced crossover distortion in Class AB amplifiers.
The 140V collector-emitter voltage rating means this small-to-medium power transistor can easily handle high-voltage rails found in classic audio gear without breaking down. Additionally, its transition frequency ( fTf sub cap T
The TO-126 package is often confused with TO-220 or other Japanese packages.
. It was a staple in high-fidelity audio equipment from the 1970s and 1980s, most famously serving as a driver or pre-driver in the power amplifier stages of legendary receivers like the Pioneer SX-828 The Story of the C1124 In the golden age of hi-fi, the Go to product viewer dialog for this item. was prized for its high voltage handling (up to ) and decent power dissipation (around c1124 transistor datasheet better
Even after leg twisting, do not trust your memory. Before soldering the new transistor into the circuit, use a to verify the pinout. An NPN transistor will behave like two diodes, with the base being the common terminal. For an NPN transistor:
You won't find the 2SC1124 at Mouser or DigiKey. Production stopped in the late 1990s.
The 2SC2910 is frequently listed as a high-voltage NPN equivalent for these types of applications. Reduced crossover distortion in Class AB amplifiers
A standard datasheet gives you a table; a datasheet provides the context needed for engineering and repair. 1. Detailed Characteristic Curves
⚠️ Many modern replacement transistors feature different pin layouts (such as E-C-B instead of B-C-E). Always verify the pin configuration using a digital multimeter's diode-check mode before soldering a substitute into a legacy circuit board. 3. Primary Applications
and that the replacement meets or exceeds the original’s voltage and current ratings [1]. full PDF datasheet for a particular manufacturer like Toshiba or Sanyo? Before soldering the new transistor into the circuit,
You might ask: Why not just buy old stock C1124s?
You cannot always drop a replacement in without thinking. Here is how to make the "better" transistor work physically and electrically.