semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab .co .uk website: http://www .semelab .co .uk document number 2666 issue 1 BF257CSM4 semelab plc reserves the right to change test conditions, parameter limits and package dimensions without notice. information fur nished by semelab is believed to be both accurate and reliable at the time of going to press. however semelab assumes no responsibility for any error s or omissions discovered in its use. semelab encourages customers to verify that datasheets are current before placing orders. silicon planar npn high voltage transistor in a ceramic surface mount package mechanical data dimensions in mm (inches) 1 2 3 4 5.59 0.13 (0.22 0.005) 0.23 (0.009) rad. 1.02 0.20 (0.04 0.008) 2.03 0.20 (0.08 0.008) 1.40 0.15 (0.055 0.006) 0.25 0.03 (0.01 0.001) 0.23 (0.009) min. 1.27 0.05 (0.05 0.002) 3.81 0.13 (0.15 0.005) 0.64 0.08 (0.025 0.003) lcc3 features ? high voltage ceramic surface mount screening options available absolute maximum ratings v cbo collector - base voltage (i e = 0 ) v ceo collector - emitter voltage (i b = 0) v ebo emitter base voltage (i c = 0) i c collector current i cm collector peak current p tot total power dissipation at t case 50c t stg storage temperature t j junction temperature pad 1 = collector pad 2 = n/c pad 3 = emitter pad 4 = base 160v 160v 5v 100ma 200ma 5w -55 to 200c 200c
r th j-case thermal resistance junction - case max 30c/w r th j-amb thermal resistance junction - ambient max 175c/w semelab plc. telephone +44(0)1455 556565. fax +44(0)1455 552612. e-mail: sales@semelab .co .uk website: http://www .semelab .co .uk document number 2666 issue 1 BF257CSM4 semelab plc reserves the right to change test conditions, parameter limits and package dimensions without notice. information fur nished by semelab is believed to be both accurate and reliable at the time of going to press. however semelab assumes no responsibility for any error s or omissions discovered in its use. semelab encourages customers to verify that datasheets are current before placing orders. thermal data electrical characteristics (tamb = 25c unless otherwise specified) parameter test conditions min. typ. max. unit v (br)ceo* v (br)cbo v (br)ebo i cbo v ce(sat)* h fe* f t c re collector?emitter breakdown voltage collector ? base breakdown voltage emitter - base breakdown voltage collector cutoff current collector ? emitter saturation voltage dc current gain transition frequency reverse capacitance 160 160 5 50 1 25 90 3 v na v ? mhz pf i c = 10ma i b = 0 i c = 100 m ai e = 0 i c = 0 i e = 100 m a v cb =100v i e = 0 i c = 30ma i b = 6ma i c = 30ma i b = 10v i c = 15ma v ce = 10v i c = 0 v ce = 30v f = 1mhz * pulsed test t p = 300 m s , d = 1%
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