The 2SD844 is an NPN transistor with a three pins TO-3PI RoHS package manufactured by SPTECH. This transistor is widely used in media, consumer electronics, and automotive applications as a power amplifier or current driver. It is capable of outputting currents up to 2.5A, with a Collector-Emitter Voltage of 80V and a DC Current Gain of 30. It also features high reliability and stability, with a long life time of more than 10,000 hours. It operates within a wide temperature range, from -55°C to 125°C, making it suitable for a wide range of different applications. The TO-3PI RoHS package ensures that this transistor is RoHS compliant, providing users with the assurance that it meets safety standards.