bu208a bu508a/bu508afi high voltage fast-switching npn power transistors n stmicroelectronics preferred salestypes n high voltage capability (> 1500 v) n fully insulated package (u.l. compliant) for easy mounting applications: n horizontal deflection for colour tv description the bu208a, bu508a and bu508afi are manufactured using multiepitaxial mesa technology for c ost-effective high performance and use a hollow emitter structure to enhance switching speeds. internal schematic diagram april 2002 absolute maximum ratings symbol parameter value unit v ces collector-emitter voltage (v be = 0) 1500 v v ceo collector-emitter voltage (i b = 0) 700 v v ebo emitter-base voltage (i c = 0) 10 v i c collector current 8 a i cm collector peak current (t p < 5 ms) 15 a bu208a bu508a bu508afi to - 3 to - 218 isowatt218 p tot total dissipation at t c = 25 o c 150 125 50 w v isol insulation withstand voltage (rms) from all three leads to exernal heatsink 2500 v t stg storage temperature -65 to 175 -65 to 150 -65 to 150 o c t j max. operating junction temperature 175 150 150 o c 1 2 3 to-218 isowatt218 1 2 3 1 2 to-3 for to-3 : c = tab e = pin2. ? 1/8 obsolete product(s) - obsolete product(s)
thermal data to-3 to-218 isowatt218 r thj-case thermal resistance junction-case max 1 1 2.5 o c/w electrical characteristics (t case = 25 o c unless otherwise specified) symbol parameter test conditions min. typ. max. unit i ces collector cut-off current (v be = 0) v ce = 1500 v v ce = 1500 v t c = 125 o c 1 2 ma ma i ebo emitter cut-off current (i c = 0) v eb = 5 v 100 m a v ceo(sus) * collector-emitter sustaining voltage (i b = 0) i c = 100 ma 700 v v ebo emitter base voltage (i c = 0) i e = 10 ma 10 v v ce(sat) * collector-emitter saturation voltage i c = 4.5 a i b = 2 a 1 v v be(sat) * base-emitter saturation voltage i c = 4.5 a i b = 2 a 1.3 v t s t f inductive load storage time fall time i c = 4.5 a h fe = 2.5 v cc = 140 v l c = 0.9 mh l b = 3 m h 7 550 m s ns f t transition frequency i c = 0.1 a v ce = 5 v f = 5 mhz 7 mhz * pulsed: pulse duration = 300 m s, duty cycle 1.5 % safe operating area (to-3) safe operating areas (to-218/isowatt218) bu208a / bu508a / bu508afi 2/8 obsolete product(s) - obsolete product(s)
derating curves (to-3) dc current gain base emitter saturation voltage derating curves (to-218/isowatt218) collector emitter saturation voltage switching time inductive load bu208a / bu508a / bu508afi 3/8 obsolete product(s) - obsolete product(s)
figure 1: inductive load switching test circuit. switching time inductive load bu208a / bu508a / bu508afi 4/8 obsolete product(s) - obsolete product(s)
dim. mm inch min. typ. max. min. typ. max. a 11.00 13.10 0.433 0.516 b 0.97 1.15 0.038 0.045 c 1.50 1.65 0.059 0.065 d 8.32 8.92 0.327 0.351 e 19.00 20.00 0.748 0.787 g 10.70 11.10 0.421 0.437 n 16.50 17.20 0.649 0.677 p 25.00 26.00 0.984 1.023 r 4.00 4.09 0.157 0.161 u 38.50 39.30 1.515 1.547 v 30.00 30.30 1.187 1.193 e b r c d a p g n v u o p003f to-3 mechanical data bu208a / bu508a / bu508afi 5/8 obsolete product(s) - obsolete product(s)
dim. mm inch min. typ. max. min. typ. max. a 4.7 4.9 0.185 0.193 c 1.17 1.37 0.046 0.054 d2.5 0.098 e 0.5 0.78 0.019 0.030 f 1.1 1.3 0.043 0.051 g 10.8 11.1 0.425 0.437 h 14.7 15.2 0.578 0.598 l2 C 16.2 C 0.637 l3 18 0.708 l5 3.95 4.15 0.155 0.163 l6 31 1.220 r C 12.2 C 0.480 ? 4 4.1 0.157 0.161 r a c d e h f g l6 l3 l2 l5 1 2 3 to-218 (sot-93) mechanical data p025a bu208a / bu508a / bu508afi 6/8 obsolete product(s) - obsolete product(s)
dim. mm inch min. typ. max. min. typ. max. a 5.35 5.65 0.211 0.222 c 3.30 3.80 0.130 0.150 d 2.90 3.10 0.114 0.122 d1 1.88 2.08 0.074 0.082 e 0.75 0.95 0.030 0.037 f 1.05 1.25 0.041 0.049 f2 1.50 1.70 0.059 0.067 f3 1.90 2.10 0.075 0.083 g 10.80 11.20 0.425 0.441 h 15.80 16.20 0.622 0.638 l 9 0.354 l1 20.80 21.20 0.819 0.835 l2 19.10 19.90 0.752 0.783 l3 22.80 23.60 0.898 0.929 l4 40.50 42.50 1.594 1.673 l5 4.85 5.25 0.191 0.207 l6 20.25 20.75 0.797 0.817 n 2.1 2.3 0.083 0.091 r 4.6 0.181 dia 3.5 3.7 0.138 0.146 p025c/a isowatt218 mechanical data - weight : 4.9 g (typ.) - maximum torque (applied to mounting flange) recommended: 0.8 nm; maximum: 1 nm - the side of the dissipator must be flat within 80 m m bu208a / bu508a / bu508afi 7/8 obsolete product(s) - obsolete product(s)
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