high power chip resistors, terminations series ppc, npc 50 & 100 ohms general information when mounted on an appropriate heat sink, these chip devices provide high power dissipation in terminations and as balancing resistors in wilkenson power divider networks. laser trimming provides maximum peak and average r.f. power capability. general specifications dc voltage (maximum): e = pr resistive tolerance: 2% standard solderable terminals: electroplated silver over nickel (ppc) gold over nickel alloy (npc) substrate: beryllium oxide ceramic resistive element: thin film and thick film * r cw capacitance c/w power model l t (pf) maximum (maximum) typical prefix w (note 1) (note 1) b typical (note 2) (note 3) power * ppc 100-200a 0.100[2,5] 0.200[5,1] 0.040[1,02] 0.030[0,76] 0.8 0.80 62w 20w * ppc 250-250a 0.250[6,4] 0.250[6,4] 0.040[1,02] 0.050[1,27] 1.2 0.30 170w 40w * ppc 250-375a 0.250[6,4] 0.375[9,53] 0.040[1,02] 0.050[1,27] 3.5 0.15 330w 150w npc 25-50 0.025[0,64] 0.050[1,27] 0.010[0,25] 0.012[0,305] 3.90 12w 3w * npc 50-50 0.050[1,27] 0.050[1,27] 0.010[0,25] 0.012[0,305] 1.90 25w 5w * npc 50-100 0.050[1,27] 0.100[2,5] 0.010[0,25] 0.017[0,43] 0.72 70w 10w npc 75-150 0.075[1,91] 0.150[3,8] 0.010[0,25] 0.020[0,51] 0.29 170w 15w * low cost thick film models available on these sizes. consult factory for specifications. performance specifications notes: 1. the l and t dimensions are for the substrate only and do not include terminal thickness or optional tinning thickness. 2. thermal resistance (r ) is measured in c/w between resistive film and mounting surface. 3. the cw power rating is based on maximum film temperature of +150 c and with maximum heatsink temperature of +100 c. power is based on infinite and ideal heatsink. type w termination style does not have full back plane metallization and typically handles less power. typical model no. npc t 25-50 x 50 g prefix tinning (if required) size terminal type (x, w or g) ohmic value ( note1 ) note:(1) resistance value is expressed using military 4-digit call-out. 50r0 = 50 ohms 1000 = 100 ohms other values from 10 500 ohms available as special order. contact factory for availabilty. 50r0 or 1000 typical model no. ppc or npc x top view w b t l b type x b t l b type g 50 ohms or 100 ohms 50 ohms only 50 ohms or 100 ohms b t l b type w 0.005 [0,13] max tolerance key f = 1% g = 2% (standard) j= 5% (see note below) key : inches[millimeters] .xx ?03 .xxx ?010 [.x ?.8 .xx ?.25] 60 south jef ferson road, whippany , nj 07981 s t el: 973-887-8100 s fax: 973-884-0445 e-mail: sales@mcekdi-resistor .com s see us on the web @ www .mcekdi-resistor .com 8 /02
|
