250w / 300w to-227 high power resistors features ??????????????????????. ? non-inductive, ? rated up to 300w depending on resistor configuration. ? small to-227 style package, with very low thermal resistance. ? superior vibration durability, with m4 screw terminals. ? rohs compliant. applications ????????????????????? ? high power snubber resistors in power supplies. ? high frequency and pulse handling circuits. ? pulse generator load resistors . ? high power crossover circuits in audio speaker systems specification specifications subject to change without notice 1 dimensions symbols (mm) a 38+/-0.5 b 25+/-0.5 c 15+/-0.5 d 30+/-0.2 e 15+/-0.5 f 13+/-0.5 g2-3.2dia. h 4-m4.0 schematics BHPR300 BHPR250 dimensions a h d e g b f c
specification items bphr 250 bphr300 test conditions power rating 250 watts 300 watts at flange temperature -55 to +25 c resistance range 1 ? to 1k ? dual 1 ? to 1k ? single nominal resistance series e24 e24 2.0 ? and 5.0 ? also available. tcr +/-100 ppm/ c +/-100 ppm/ c from -55 to +120 c tolerance +/-5%(j) +/-5%(j) operation temp. range -55 - +120 c -55 - +120 c max. applied voltage (p.r) dielectric withstanding voltage 2500v 60 seconds. load life ? r+/-(1.0 %+0.05 ? ) 25 c, 90 min.on, 30min.off, 1000hours. humidity ? r +/-(1.0 %+0.05 ? ) 70 c, 90 to 95%rh, dc0.1w, 1000hours. temperature cycle ? r +/-(1.0 %+0.05 ? ) -55 c, 30 min.,+155 c 30 min., 20 cycles. 55 c, 30 min.,+120c, 30 min., 20 cycles. short time overload ? r +/-(0.25 %+0.05 ? ) (rated power2.5) for 2.5seconds with heat sink. insulation resistance over 1000 m ? between terminals and flange. vibration ? r +/-(0.25 %+0.05 ? ) note: BHPR 250 has two resistors of equal values. (e.g. BHPR250 500 f, has two 50 ? resistors. see schematic). current rating: 100a maximum. ordering information BHPR 250 500 j model power rating tolerance 250 : 250w j = 5% tol 300 ; 300w resistance code 500 : 50 ? (first two digits significant, la st digit: number of trailing zeros) BHPR 250w / 300w high power resistors 2 temperature rise, BHPR 300 temp. rise ( c) 0 100 200 300 applied power (w) 160 140 120 100 80 60 40 20 resistor temperature flange temperature derating curve, BHPR 250, BHPR 300 power rating 100 80 60 40 20 0 flange temperature +25 c +120 c -50 0 +50 +100 +150 +200 materials flange: ni plated copper plate. substrate: alumina substr ate. resistor: metal film resistor. case: polycarbonate p lastics. terminals: ni p lated co pp er allo y to suit screw: 4-m4/10mm. using 0.1 c/w heat sink
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