(often connected to the metal tab for heat dissipation) Base 3. Key Applications Video Output : High-frequency response ( ) and high voltage ( ) make it suitable for driving CRT cathodes.
Note that while BD139 is common, its breakdown voltage is typically limited to
The C1124 features an exceptionally robust Safe Operating Area (SOA). Compared to modern components with comparable power ratings, it exhibits lower thermal resistance and can manage higher transient pulse currents up to its 1A threshold. This protects the device from catastrophic secondary breakdown during sudden speaker load impedance drops. Common Applications
(e.g., 120 MHz to 200 MHz) ensures faster switching speeds, cleaner high-frequency response, and lower total harmonic distortion (THD). Premium Alternatives with Better Datasheets
High-voltage, high-speed switching, video output Collector-Emitter Voltage ( VCEOcap V sub cap C cap E cap O end-sub ): 160V Collector-Base Voltage ( VCBOcap V sub cap C cap B cap O end-sub ): 160V Collector Current ( ICcap I sub cap C c1124 transistor datasheet better
When you find a datasheet, don't just look at the max ratings. To truly do "better" than the original, analyze these three charts:
Different manufacturers (e.g., Sony, Sanyo, Toshiba) may list slightly different ratings for power dissipation and breakdown voltage. Always verify the specific brand's datasheet to avoid circuit failure. Counterfeit Risks:
and 1A collector current in a TO-202/TO-220 package. Commonly paired with the 2SA706 for Class AB amplifiers, this transistor offers high linearity and thermal stability, with common alternatives including 2SC1162 and 2SC5200. Detailed specifications and application data are available from UXPython and AllTransistors .
Go to product viewer dialog for this item. (often abbreviated as ) is a vintage NPN silicon transistor manufactured by (often connected to the metal tab for heat
: Similar characteristics but may have different gain brackets.
Bookmark the datasheet for TIP31C and BD243C . These two components cover 80% of all C1124 use cases. That is the ultimate "better" hack.
: A healthy silicon transistor should show a base-emitter voltage ( cap V sub cap B cap E end-sub ) of approximately 0.6V to 0.7V when active [2, 13]. Failure Signs cap V sub cap B cap E end-sub
The 2SC1124 is engineered to balance high breakdown voltages with high-frequency capabilities. Below is the foundational specification set extracted from standard technical datasheets: NPN Bipolar Junction Transistor (BJT) Collector-Base Voltage ( VCBOcap V sub cap C cap B cap O end-sub ): 160V maximum Collector-Emitter Voltage ( VCEOcap V sub cap C cap E cap O end-sub ): 140V maximum Emitter-Base Voltage ( VEBOcap V sub cap E cap B cap O end-sub ): 5V maximum Continuous Collector Current ( ICcap I sub cap C ): 1A maximum Collector Power Dissipation ( PCcap P sub cap C ): 5W (when paired with an adequate heatsink) Transition Frequency ( fTf sub cap T ): 120 MHz to 140 MHz Minimum DC Current Gain ( hFEh sub cap F cap E end-sub ): 50 Physical Package Variations and Pin Configuration Compared to modern components with comparable power ratings,
. Ensure your application’s rail voltages do not exceed this threshold if switching to a BD-series part.
If your current datasheet search reveals limited component availability, consider these modern, high-performance replacements that meet or exceed the original C1124 parameters: Offers a higher collector current ( ) and excellent frequency response (
A high-quality datasheet isolates static (DC) and dynamic (AC) parameters to give circuit designers precise modeling inputs for SPICE simulations and structural worst-case analyses. DC Parameters Emitter Cutoff Current ( IEBOcap I sub cap E cap B cap O end-sub ): DC Current Gain ( hFEh sub cap F cap E end-sub ): Rank R: 60 to 120 Rank S: 100 to 200 Rank T: 160 to 320 (Measured at Collector-Emitter Saturation Voltage (