Specification Items
BPHR 250
BPHR300
Test Conditions
Power Rating
250 Watts
300 Watts
At flange temperature -55 to +25
°C
Resistance Range
1
Ω to 1KΩ
Dual
1
Ω to 1KΩ
Single
Nominal Resistance Series
E24
E24
2.0
Ω and 5.0 Ω 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 Ω)
25
°C, 90 min.ON, 30min.OFF, 1000hours.
Humidity
∆R +/-(1.0 %+0.05 Ω)
70
°C, 90 to 95%RH, DC0.1W, 1000hours.
Temperature Cycle
∆R +/-(1.0 %+0.05 Ω)
-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 Ω)
(Rated Power×2.5) for 2.5seconds with heat
sink.
Insulation Resistance
Over 1000 M
Ω
Between terminals and flange.
Vibration
∆R +/-(0.25 %+0.05 Ω)
Note: BHPR 250 has two resistors of equal values. (e.g. BHPR250 500 F, has two 50
Ω 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
Ω (First two digits significant, last 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 substrate. Resistor: Metal film resistor. Case: Polycarbonate
plastics. Terminals: Ni plated copper alloy to suit screw: 4-M4/10mm.
Using 0.1
°C/W heat sink
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