smd type transistors 1 www.kexin.com.cn npn high-voltage transistors BST39; bst40 features low current (max. 50 ma) high voltage (max. 300 v). absolute maximum ratings ta = 25 parameter symbol rating unit collector-base voltage BST39 400 v (open emitte) bst40 300 v collector-emitter voltage BST39 350 v (open-base ) bst40 250 v emitter-base voltage (open collector) v ebo 5v collector current (dc) i c 100 ma peak collector current i cm 200 ma peak base current i bm 100 ma total power dissipation t amb 25 * p tot 1.3 w storage temperature t stg -65 to150 junction temperature t j 150 operating ambient temperature t amb -65 to150 thermal resistance from junction to ambient * r th j-a 96 k/w thermal resistance from junction to soldering point r th j-s 16 k/w * device mounted on a printed-circuit board, single-sided copper, tinplated, mounting pad for collector 6 cm 2 . v cbo v ceo free datasheet http:///
2 smd type transistors www.kexin.com.cn electrical characteristics ta = 25 unless otherwise specified. parameter symbol testconditons min typ max unit collector cut-off current i cbo i e =0;v cb = 300 v 20 na emitter cut-off current i ebo i c =0;v eb = 5 v 100 na dc current gain h fe i c =20ma;v ce =10v 40 collector-emitter saturation voltage v cesat i c =50ma;i b = 4 ma 500 mv collector capacitance c c i e =i e =0;v cb =10v;f=1mhz 2 pf transition frequency f t i c =10ma;v ce =10v;f=100mhz 70 mhz marking type number BST39 bst40 marking at1 at2 BST39; bst40 free datasheet http:///
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