1. Type
- PNP (Positive-Negative-Positive) transistor: This means the current flows from the emitter to the collector.
- Small, low-power, and versatile: Ideal for various electronic circuits.
2. Ratings and characteristics
- Collector-Emitter Voltage (Vce): Typically -25V.
- Collector-Base Voltage (VCBO): Typically -40V.
- Emitter-Base Voltage (VEBO): Typically -5V to -6V.
- Collector Current (Ic): Varies depending on the manufacturer and specific model, ranging from -0.5A to -1.5A. Some sources mention a typical maximum of 700mA.
- Power Dissipation (Pd): Varies, with some sources listing 300mW and others stating around 625mW. Some variants like the SS8550 can dissipate 1W.
- DC Current Gain (hFE): Ranges from 85 to 400 depending on the variant and conditions, with typical values between 110 and 300.
- Transition Frequency (ft): Typically around 150MHz or 200MHz.
- Operating Temperature Range: Broad, from -55°C to +150°C.


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