RA251 THRU RA257 21201 Itasca St. Chatsworth, CA 91311 Phone: (818) 701-4933 Fax: (818) 701-4939 Features * * * * 25 Amp Button Rectifier 50 to 1000 Volts Button Package For High Heat Dissipation High Current Capability Low Leakage Surge Rating Of 400 Amps RA Maximum Ratings * * Operating Temperature: -55C to +175C Storage Temperature: -55C to +175C Microsemi Part Number RA251 RA252 RA253 RA254 RA255 RA256 RA257 Maximum Recurrent Peak Reverse Voltage 50V 100V 200V 400V 600V 800V 1000V Maximum RMS Voltage Maximum DC Blocking Voltage 35V 70V 140V 280V 420V 560V 700V 50V 100V 200V 400V 600V 800V 1000V E C B A Electrical Characteristics @ 25C Unless Otherwise Specified Average Forward Current Peak Forward Surge Current Maximum Forward Voltage Drop Per Element IF(AV) 25.0A TJ = 150C IFSM 400A 8.3ms, half sine D DIMENSIONS VF 1.0V IFM = 25A TJ = 25C* Maximum DC Reverse Current At IR 10A TJ = 25C Rated DC Blocking 1.0mA TJ = 100C Voltage *Pulse test: Pulse width 300 sec, Duty cycle 1% DIM A B C D E INCHES MIN 0.395 0.234 0.165 0.218 --- MAX 0.450 0.246 0.175 0.222 5 MM MIN 10.03 5.94 4.19 5.54 --- MAX 10.29 6.25 4.45 5.64 5 NOTE NOM RA251 thru RA257 Figure 1 Typical Forward Characteristics Figure 2 Typical Reverse Characteristics 10 100 600 6 400 4 200 2 1 100 .6 60 .4 40 .2 20 TJ=25C 25C Amps .1 Amps 1 0 6 .06 .04 4 .02 2 .0 1 .006 1 .6 .004 .4 .002 .2 .1 .001 20 .2 .4 .6 .8 1.0 1.2 40 60 80 100 120 140 1.4 Volts Volts Instantaneous Forward Current - Amperes versus Instantaneous Forward Voltage - Volts Instantaneous Reverse Leakage Current - MicroAmperes versus Percent Of Rated Peak Reverse Voltage - Volts Figure 3 Forward Derating Curve Figure 4 Peak Forward Surge Current 30 600 25 500 20 400 300 15 Amps Amps 200 10 100 5 Single Phase, Half Wave 60Hz Resistive or Inductive Load 0 25 50 75 100 125 0 150 175 C Average Forward Rectified Current - Amperes versus Case Temperature - C 1 2 4 6 8 10 20 40 60 80 100 Cycles Peak Forward Surge Current - Amperes versus Number Of Cycles At 60Hz - Cycles