1/5 STTH208/u january 2003 - ed: 1 high voltage ultrafast rectifier ? the STTH208, which is using st ultrafast high voltage planar technology, is specially suited for free-wheeling, clamping, snubbering, demagneti- zation in power supplies and other power switching applications. description n low forward voltage drop n high reliability n high surge current capability n soft switching for reduced emi disturbances n planar technology features and benefits symbol parameter value unit v rrm repetitive peak reverse voltage 800 v v (rms) rms voltage 560 v i f(av) average forward current tl = 60c d =0.5 do-15 2 a tl = 100c d =0.5 smb 2 i fsm forward surge current t = 8.3 ms do-15 45 a smb 35 t stg storage temperature range - 50 + 175 c tj maximum operating junction temperature + 175 c absolute ratings (limiting values) i f(av) 2a v rrm 800 v tj (max) 175 c v f (max) 1.25 v main product characteristics do-15 STTH208 smb STTH208u
STTH208/u 2/5 symbol parameter tests conditions min. typ. max. unit i r reverse leakage current v r = 800v tj = 25c 5 a tj = 125c 50 v f forward voltage drop i f = 2 a tj = 25c 1.65 v tj = 150c 0.89 1.25 to evaluate the maximum conduction losses use the following equation : p=1.05xi f(av) +0.10xi f 2 (rms) static electrical characteristics symbol parameter value unit r th (j-l) junction to lead l = 10 mm do-15 40 c/w smb 25 r th (j-a) junction to ambient l = 10 mm do-15 110 thermal parameters symbol parameter tests conditions min. typ. max. unit t rr reverse recovery time i f = 0.5 a irr = 0.25 a i r =1a tj = 25c 75 ns t fr forward recovery time i f =2a di f /dt = 50 a/s v fr =1.1xv f max tj = 25c 200 ns v fp forward recovery voltage 9 v dynamic electrical characteristics
STTH208/u 3/5 p(w) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 d = 1 d = 0.05 d = 0.5 d = 0.2 d = 0.1 i (a) f(av) t d =tp/t tp fig. 1: conduction losses versus average current. i (a) fm 0.1 1.0 10.0 100.0 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 v (v) fm t =150c (maximum values) j t =150c (typical values) j t =25c (maximum values) j fig. 2: forward voltage drop versus forward current . z/r th(j-c) th(j-c) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.e-01 1.e+00 1.e+01 1.e+02 1.e+03 t d =tp/t tp t (s) p d = 0.5 d = 0.2 d = 0.1 single pulse fig. 3-1: relative variation of thermal impedance junction ambient versus pulse duration (epoxy fr4, l leads = 10mm) (do-15). z/r th(j-c) th(j-c) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.e-01 1.e+00 1.e+01 1.e+02 1.e+03 t d =tp/t tp t (s) p d = 0.5 d = 0.2 d = 0.1 single pulse fig. 3-2: relative variation of thermal impedance junction ambient versus pulse duration (epoxy fr4, s=1cm 2 ) (smb). r (c/w) th(j-a) 0 10 20 30 40 50 60 70 80 90 100 110 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 s(cm2) do-15 l =10mm leads smb fig. 4: thermal resistance junction to ambient versus copper surface under each lead (epoxy printed circuit board fr4, copper thickness: 35m) .
STTH208/u 4/5 package mechanical data smb e c l e1 d a1 a2 b ref. dimensions millimeters inches min. max. min. max. a1 1.90 2.45 0.075 0.096 a2 0.05 0.20 0.002 0.008 b 1.95 2.20 0.077 0.087 c 0.15 0.41 0.006 0.016 e 5.10 5.60 0.201 0.220 e1 4.05 4.60 0.159 0.181 d 3.30 3.95 0.130 0.156 l 0.75 1.60 0.030 0.063 1.52 2.75 2.3 1.52 footprint (in millimeters)
STTH208/u 5/5 package mechanical data do-15 a c c d b ref. dimensions millimeters inches min. max. min. max. a 6.05 6.75 0.238 0.266 b 2.95 3.53 0.116 0.139 c 26 31 1.024 1.220 d 0.71 0.88 0.028 0.035 ordering code marking package weight base qty delivery mode STTH208 STTH208 do-15 0.4 g 1000 ammopack STTH208u u08 smb 0.11 g 2500 tape & reel STTH208rl STTH208 do-15 0.4 g 6000 tape & reel n epoxy meets ul 94,v0 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2003 stmicroelectronics - printed in italy - all rights reserved. stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany hong kong - india - israel - italy - japan - malaysia - malta - morocco - singapore spain - sweden - switzerland - united kingdom - united states. http://www.st.com
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