) matching, making it excellent for audio driver stages requiring high fidelity.
). This makes it highly stable against transient voltage spikes in unregulated linear power supplies or the high-voltage swing lines of classic audio power amplifiers. High Transition Frequency ( fTf sub cap T c1124 transistor datasheet better
: Similar characteristics but may have different gain brackets. ) matching, making it excellent for audio driver
. It is primarily recognized for its high-voltage capabilities and is frequently used in the pre-driver stages of vintage audio equipment, such as the Pioneer SX-828 receiver. Technical Specifications High Transition Frequency ( fTf sub cap T
| Replacement | Why It Is Better | Better Spec | | :--- | :--- | :--- | | | Readily available, cheap, TO-220 | ( V_CEO ) 100V (higher), 3A, 40W | | 2N6124 | Better heat dissipation | 4A, ( h_FE ) linear up to 3A | | BD243C | High gain at low current | ( h_FE ) 40-250, excellent for audio | | MJE340 | High voltage safety margin | ( V_CEO ) 300V, 20W, stable | | KSD880 (Original Japanese) | Direct pin-for-pin replacement | Same case, slightly lower saturation |
This is the most critical chart for power transistors. It tells you the maximum current and voltage limits simultaneously. Without a clear SOA diagram, you risk thermal runaway in high-load applications like power amplifiers. 3. Thermal Resistance Data