?2001 fairchild semiconductor corporation rev. a1, july 2001 kst4123 npn epitaxial silicon transistor absolute maximum ratings t a =25 c unless otherwise noted electrical characteristics t a =25 c unless otherwise noted * pulse test: pw 300 s, duty cycle 2% symbol parameter value units v cbo collector-base voltage 40 v v ceo collector-emitter voltage 30 v v ebo emitter-base voltage 5 v i c collector current 200 ma p c collector power dissipation 350 mw t stg storage temperature 150 c r th (j-a) thermal resistance junction to ambient 357 c/w symbol parameter test condition min. max. units bv cbo collector-base breakdown voltage i c =10 a, i e =0 40 v bv ceo * collector-emitter breakdown voltage i c =1ma, i e =0 30 v bv ebo emitter-base breakdown voltage i e =10 a, i c =0 5 v i cbo collector cut-off current v cb =20v, i e =0 50 na i ebo emitter cut-off current v eb =3v, i c =0 50 na h fe * dc current gain v ce =1v, i c =2ma v ce =1v, i c =50ma 50 25 150 v ce (sat) * collector-emitter saturation voltage i c =50ma, i b =5ma 0.3 v v be (sat) * base-emitter saturation voltage i c =50ma, i b =5ma 0.95 v f t current gain bandwidth product v ce =20v, i c =10ma, f=100mhz 250 mhz c ib input capacitance v be =0.5v, i c =0, f=100khz 8 pf c ob output capacitance v cb =5v, i e =0, f=100khz 4 pf nf noise figure v ce =5v, i c =100 a, r s =1k ? noise bandwidth=10hz to 15.7khz 6db 1. base 2. emitter 3. collector kst4123 general purpose transistor 5b marking sot-23 1 2 3
0.96~1.14 0.12 0.03~0.10 0.38 ref 0.40 0.03 2.90 0.10 0.95 0.03 0.95 0.03 1.90 0.03 0.508ref 0.97ref 1.30 0.10 0.45~0.60 2.40 0.10 +0.05 ?.023 0.20 min 0.40 0.03 sot-23 package demensions ?2001 fairchild semiconductor corporation rev. a1, july 2001 kst4123 dimensions in millimeters
disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: ?2001 fairchild semiconductor corporation rev. h3 trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information formative or in design this datasheet contains the design specifications for product development. specifications may change in any manner without notice. preliminary first production this datasheet contains preliminary data, and supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. no identification needed full production this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. obsolete not in production this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. a cex? bottomless? coolfet? crossvolt ? densetrench? dome? ecospark? e 2 cmos? ensigna? fact? fact quiet series? fast ? fastr? frfet? globaloptoisolator? gto? hisec? isoplanar? littlefet? microfet? microwire? optologic? optoplanar? pacman? pop? power247? powertrench ? qfet? qs? qt optoelectronics? quiet series? slient switcher ? smart start? star*power? stealth? supersot?-3 supersot?-6 supersot?-8 syncfet? trutranslation? tinylogic? uhc? ultrafet ? vcx? star*power is used under license
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