BY 251...BY 255 *0 Axial lead diode Standard silicon rectifier diodes ,38 Forward Current: 3 A Reverse Voltage: 200 to 1300 V Features 1) #8- # " ? => // '5 '5 ,3- C 9 ) 1 + 8 9 1 ; 1 ; ) 3) 7 + 8* 7 *7 & ) 7 * - ) ,8 5< 5< 86 '< '< * 4 /2 1) 2 *7 4 / H #8 4 #88 ; 9 ) $ $ $ $ #3< '2' '2' '2' '2' $ '2' ; Values Units 5 6 6 ' 6 / 6C / EF( $ EF( $/G'/ $/G'./ ; Values Units D I6 $ 3 $ I $ J *7 4 H #8 4 #88 J *0 7 L 8 9 M8- N K AB 9 9 ) #< 9 0 ) K8 4 #H ,3 4 6H ,3F 4 6F < 9 1 9 K,8 4 6H *7 4 H 9 9 ; )0 < ' Dimensions in mm ,34562 *74/ *6 4 / 1 @ '/ AB'< / AB $;9 8 ) )2 D ' 2) 2 8$ 2 *6 4 / '< ; 9 9 0 ,3 4 $ 6 ,8 4 $ 6 ,88 4 $ 6 * 4 /2 Characteristics Symbol Conditions + ,$-*%$./ ) 0 - 1) ) '. # 2 => /' => / => /5 => /" #88 # " ? !"#$ Mechanical Data %&$' ( ) ' ) * -) 1 9 9 ) Absolute Maximum Ratings Symbol Conditions ,36# BY 251...BY 255 8 9 1 9 9 ) %&$' 01-04-2004 SCT © by SEMIKRON BY 251...BY 255 Fig. 1 Forward characteristics ( typical values ) Fig. 2 Rated forward current vs. ambient temperature 1) Fig. 3 IFSM current versus number of cycles at 50 Hz 2 01-04-2004 SCT © by SEMIKRON