Ultra Low Prole
Power Resistors
WDBR Series
Ultralowprolethick-lmonsteel
500Wto7kWpeakpower
Singlexingheatsinkmountable
Idealfordynamicbraking,inrushlimitandsnubbercircuits
Choiceofyinglead,push-onorsolderterminaons
Lowinductancedesign
Highisolaon,evenaerfailsafeoverloadfusing
RoHScompliant,non-ammableconstrucon
WDBR1/2 WDBR1 WDBR2 WDBR3 WDBR5 WDBR7
Resistancerange ohms
12,15,20,22,25,
47,50,100
12,15,20,22,25,47,50,100,150
Resistancetolerance % 10
Pulsepowerrang
1
kW 0.5 1.5 2.0 3.5 5.0 7.0
Powerrangonheatsink
2
W 160 180 200 260 270 280
Powerrangonfan-cooledheatsink
3
W 300 700 780 900 1000 1490
TCR ppm/°C < +600
Maximumelementtemperature °C 365
Ambienttemperaturerange(heatsink)°C -55to+200
Dielectricwithstand
4
V(dc/acpeak) 2500
Inductance(typical) μH <3 <4 <5 <6
ElectricalData
Notes:
1.FordetailsofpulsecondionseeFig.1inPerformanceData.
2.Mountedona0.53°C/Wheatsinkwithnoforcedaircooling,airtemperature25°C.
3.Mountedona0.53°C/Wheatsinkwith5m/sforcedaircooling,airtemperature25°C.
4.Basedon100%producontest,duraon2sminimum
Construcon
Ahighintegritydielectriclayerisappliedtoamachined
stainlesssteelsubstrate.Thick-lmconductorandresistor
paernsareprintedandred,thenprotectedwithahigh
temperatureoverglaze.Theterminaonpadsarennedwith
solderandoponalterminalsor���leadsaresolderedon.
PhysicalData
Dimensionsinmm,weightwithoutterminaonsing
L ±0.1 W ±0.1 t ±0.1 ØDnom anom bnom cnom Wt.nom
WDBR1/2 31.9 28.1
0.9
2.2 7.5 3.1 4.3 6.5
WDBR1 49.3 35.9 3.2 3.2 11.2 6.2 12.6
WDBR2 61 40.6
5.3
4.7 13.0 5.8 17.1
WDBR3 101.6 70 13.5 22.0 10.2 50.8
WDBR5 122 70 14.0 23.8 7.4 60.7
WDBR7 152.4 101.6 1.5 15.0 51.3 9.2 181.8
Fixing hole is located cen-
trally except on WDBR1/2
where the dimension from
the edge by the terminaons
tothemounngholecentreis
16.68mm.
Inaddiontothecentralxing
hole, WDBR7 has two corner
holes. These are present for
manufacturing purposes only
andshouldnotbeusedasx-
ingholes.
W
L
c
b
a
Substratethickness =t
D
Resistors
AllPb-freepartscomplywithEUDirecve2011/65/EU(RoHS2)
12.16
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
http://www.ttelectronics.com/resistors
BI Technologies IRC Welwyn