RAXMMD0412XX general purpose rectifier diode element powerex, inc., 173 pavilion ln, youngwood, pa 15697-1800 724 925-7272 www.pwrx.com 12,000 amperes 400 volts features: low on-state voltage excellent surge and i 2 t ratings applications: welding supplies dc power supplies plating supplies ordering information select the complete 12 digit part number using the table below. example: RAXMMD0412XX is a 400v 12,000a welding diode element with a typical reverse recovery time of 25s. part voltage rating voltage code current rating current code reverse recovery lead code v drm -v rrm i tavg t rr raxmmd 400v 04 12000a 12 xx oo 25s typical revised: 5/15/2012 powerex general purpose rectifier diode elements are for low forward voltage drop to minimize conduction losses. they are made with molybdenum anode and cathode contacts to minimize thermal stresses during operation. they can be mounted directly to an air or water cooled heat exchangers to achieve high current handling capability. page 1 of 6
RAXMMD0412XX general purpose rectifier diode element powerex, inc., 173 pavilion ln, youngwood, pa 15697-1800 724 925-7272 www.pwrx.com 12,000 amperes 400 volts absolute maximum ratings characteristic symbol rating units repetitive peak reverse voltage v rrm 400 volts average on-state current, t c =79c i f(avg.) 12000 a rms on-state current, t c =79c i f(rms) 18850 a peak one cycle surge current, 60hz, v r =v rrm i fsm 54,400 a fuse coordination i 2 t, 60hz i 2 t 1.23e+07 a 2 s peak one cycle surge current, 50hz, v r =0v i fsm 51,800 a fuse coordination i 2 t, 50hz i 2 t 1.34e+07 a 2 s operating temperature tj -40 to+175 c storage temperature t stg. -50 to+200* c * limit to 50c prior to assembly. approximate weight 0.3 lb 0.14 kg mounting force 9,000 - 11,000 lbs 40 - 48.9 knewtons mounting recommendations information presented is based upon manufacturers testing and projected capabilities. this information is subject to change without notice. the manufacturer makes no claim as to suitability for use, reliability, capability or future availability of this product. contact surfaces of this diode element are subject to oxidation at high temperatures. it is recommended that these elements be sealed in the assembly using an o-ring or similar sealing mechanism. contacts can be further protected by coating with a thin layer of high temperature silicon based oil. page 2 of 6
RAXMMD0412XX general purpose rectifier diode element powerex, inc., 173 pavilion ln, youngwood, pa 15697-1800 724 925-7272 www.pwrx.com 12,000 amperes 400 volts electrical characteristics, tj=25c unless otherwise specified rating characteristic symbol test conditions min typ max units repetitive peak reverse leakage current i rrm tj=175c, v rrm =rated 15 100 ma peak on-state voltage v fm tj=25c, i fm =10,000a 1.10 v v fm model, low level v 0 tj=175c 0.729 v vfm = v o + r? i fm r 15% i fm - ?i fm 0.0293 m v fm model, high level v 0 tj=175c 0.979 v vfm = v o + r? i fm r ?i fm - i fsm 0.0226 m v fm model, high level 4-term a tj=175c -0.636 v fm = a + b?ln(i fm ) + b 15%i fm - i fsm 0.1760 c?(i fm ) + d?(i fm ) ? c 2.136e-05 d -0.000985 reverse recovery time t rr tj=25c, i fm =400a 25 s di r /dt = 25 a/s thermal characteristics rating characteristic symbol test conditions min typ max units thermal resistance junction to case r jc double side cooled 0.005 c/watt case to sink r cs double side cooled 0.003 c/watt thermal impedance model z jc double side cooled z jc (t) = (a( n )?(1-exp(-t/ tau ( n )))) where: n = 1 2 3 4 a(n ) = 8.117e-04 4.774e-04 3.402e-03 3.423e-04 t au(n) = 1.112e-03 4.481e-03 4.894e-02 2.710e-01 page 3 of 6
RAXMMD0412XX general purpose rectifier diode element powerex, inc., 173 pavilion ln, youngwood, pa 15697-1800 724 925-7272 www.pwrx.com 12,000 amperes 400 volts 0.0e+00 1.0e-03 2.0e-03 3.0e-03 4.0e-03 5.0e-03 6.0e-03 0.001 0.01 0.1 1 10 thermal impedance ( c/watt) time (sec) maximum transient thermal impedance 0.00 0.50 1.00 1.50 2.00 2.50 3.00 1000 10000 100000 vfm (v) ifm (a) maximum on - state voltage drop tj = 175 c page 4 of 6
RAXMMD0412XX general purpose rectifier diode element powerex, inc., 173 pavilion ln, youngwood, pa 15697-1800 724 925-7272 www.pwrx.com 12,000 amperes 400 volts 0 20 40 60 80 100 120 140 160 180 200 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 0 2000 4000 6000 8000 10000 12000 14000 maximum allowable case temperature ( c) pavg (watts) iavg (a) average current ratings 180 sine wave pavg tc 0 20 40 60 80 100 120 140 160 180 200 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 0 2000 4000 6000 8000 10000 12000 14000 maximum allowable case temperature ( c) pavg (watts) iavg (a) average current ratings 180 square wave pavg tc page 5 of 6
RAXMMD0412XX general purpose rectifier diode element powerex, inc., 173 pavilion ln, youngwood, pa 15697-1800 724 925-7272 www.pwrx.com 12,000 amperes 400 volts 0 20 40 60 80 100 120 140 160 180 200 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 0 2000 4000 6000 8000 10000 12000 14000 maximum allowable case temperature ( c) pavg (watts) iavg (a) average current ratings 120 square wave pavg tc page 6 of 6
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