View 2sd2598 e datasheet:

Transistor 2SD2598 Unit: mm Silicon NPN epitaxial planer type 2.5± 0.1 1.05 darlington 6.9± 0.1 ± 0.05 (1.45) 0.7 4.0 0.8 For low-frequency amplification 0.65 max. Features Forward current transfer ratio hFE is designed high, which is ap- propriate to the driver circuit of motors and printer bammer: hFE +0.1 0.45–0.05 = 4000 to 20000. 2.5± 0.5 2.5± 0.5 A shunt resistor is omitted from the driver. 1 2 3 M type package allowing easy automatic and manual insertion as well as stand-alone fixing to the printed circuit board. Note: In addition to the 1:Emitter lead type shown in 2:Collector the upper figure, the 3:Base Absolute Maximum Ratings (Ta=25?C) type as shown in MT2 Type Package the lower figure is Parameter Symbol Ratings Unit also available. Collector