BU941/BU941p BU941pfi high voltage ignition coil driver npn power darlington n npn darlington n integrated antiparallel collector-emitter diode n very rugged bipolar technology n high operating junction temperature n wide range of packages applications n high ruggedness electronic ignitions internal schematic diagram december 1999 for to-3 emitter: pin 2 base: pin1 collector: tab absolute maximum ratings symbol parameter value unit BU941 BU941p bub941pfi v ces collector-emitter voltage (v be = 0) 500 v v ceo collector-emitter voltage (i b = 0) 400 v v ebo emitter-base voltage (i c = 0) 5 v i c collector current 15 a i cm collector peak current 30 a i b base current 1 a i bm base peak current 5 a p tot total dissipation at t c = 25 o c 180 155 65 w t stg storage temperature -65 to 200 -65 to 175 -65 to 175 o c t j max. operating junction temperature 200 175 175 o c 1 2 3 to-218 isowatt218 1 2 3 1 2 to-3 ? 1/8
thermal data to-3 to-218 isowatt218 r thj-case thermal resistance junction-case max 0.97 0.97 2.3 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 = 500 v v ce = 500 v t j = 125 o c 100 0.5 m a ma i ceo collector cut-off current (i b = 0) v ce = 450 v v ce = 450 v t j = 125 o c 100 0.5 m a ma i ebo emitter cut-off current (i c = 0) v eb = 5 v 20 ma v ceo(sus) * collector-emitter sustaining voltage (i b = 0) i c = 100 ma l = 10 mh v clamp = 400 v (see fig.4) 400 v v ce(sat) * collector-emitter saturation voltage i c = 8 a i b = 100 ma i c = 10 a i b = 250 ma i c = 12 a i b = 300 ma 1.6 1.8 2 v v v v be(sat) * base-emitter saturation voltage i c = 8 a i b = 100 ma i c = 10 a i b = 250 ma i c = 12 a i b = 300 ma 2.2 2.5 2.7 v v v h fe * dc current gain i c = 5 a v ce = 10 v 300 v f diode forward voltage i f = 10 a 2.5 v functional test (see fig. 1) v cc = 24 v v clamp = 400 v l = 7 mh 10 a t s t f inductive load storage time fall time (see fig. 3) v cc = 12 v v clamp = 300 v v be = 0 r be = 47 w l = 7 mh i c = 7 a i b = 70 ma 15 0.5 m s m s * pulsed: pulse duration = 300 m s, duty cycle 1.5 % safe operating area dc current gain BU941 / BU941p / bub941pfi 2/8
dc current gain collector-emitter saturation voltage switching time inductive load (see fig.3) collector-emitter saturation voltage base-emitter saturation voltage BU941 / BU941p / bub941pfi 3/8
figure 1: functional test circuit figure 2: functional test waveforms figure 3: switching time test circuit figure 4: sustaining voltage test circuit BU941 / BU941p / bub941pfi 4/8
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 BU941 / BU941p / bub941pfi 5/8
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 BU941 / BU941p / bub941pfi 6/8
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 BU941 / BU941p / bub941pfi 7/8
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