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Mono, 5 Channel , Class D etc.
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The MJL21194 is a high-power, NPN bipolar junction transistor (BJT) designed primarily for high-fidelity audio amplifiers, linear applications, and power switching, featuring a 250V, 16A capacity in a TO-264 package. It is known for its ruggedness, high safe operating area (SOA), and is often paired with the PNP MJL21193.
Key Specifications & Features:
Type: NPN Power Transistor
Package: TO-264 (3 pins)
Collector-Emitter Voltage (
): 250V Max
Continuous Collector Current (
): 16A
Power Dissipation (
): 200W
Gain (
): Min 75
Technology: Perforated Emitter for improved reliability
Frequency: 4MHz
Applications:
High-power audio amplifiers
Class A and AB linear applications
Disk head positioners
Usage and Availability:
The MJL21194G (lead-free version) is often used in professional audio equipment and is popular in DIY amplifier designs. While sometimes listed as obsolete or restricted in certain regions, it is still commonly available through specialized electronics suppliers,
often in matched pairs with the MJL21193.



The 2SC5200 is a high-power NPN bipolar junction transistor (BJT) manufactured by Toshiba, widely known for its use in high-fidelity audio amplifier output stages. It is frequently paired with its complementary PNP transistor, the 2SA1943, in push-pull amplifier designs.

According to the Toshiba datasheet and various component suppliers, the 2SC5200 has the following characteristics:
Parameter Specification
Transistor Polarity NPN
Collector-Emitter Voltage (VCEO) 230 V
Continuous Collector Current (Ic) 15 A
Power Dissipation (Pc) 150 W (with heat sink)
DC Current Gain (hFE) 55 to 160 (rank dependent)
Transition Frequency (fT) 30 MHz
Package Type TO-264 or TO-3P (through-hole mounting)