Ultra Low Prole
Power Resistors
WDBR Series
Ultralowprolethick-lmonsteel
500Wto7kWpeakpower
Singlexingheatsinkmountable
Idealfordynamicbraking,inrushlimitandsnubbercircuits
Choiceofyinglead,push-onorsolderterminaons
Lowinductancedesign
Highisolaon,evenaerfailsafeoverloadfusing
RoHScompliant,non-ammableconstrucon
WDBR1/2 WDBR1 WDBR2 WDBR3 WDBR5 WDBR7
Resistancerange ohms
12,15,20,22,25,
47,50,100
12,15,20,22,25,47,50,100,150
Resistancetolerance % 10
Pulsepowerrang
1
kW 0.5 1.5 2.0 3.5 5.0 7.0
Powerrangonheatsink
2
W 160 180 200 260 270 280
Powerrangonfan-cooledheatsink
3
W 300 700 780 900 1000 1490
TCR ppm/°C < +600
Maximumelementtemperature °C 365
Ambienttemperaturerange(heatsink)°C -55to+200
Dielectricwithstand
4
V(dc/acpeak) 2500
Inductance(typical) μH <3 <4 <5 <6
ElectricalData
Notes:
1.FordetailsofpulsecondionseeFig.1inPerformanceData.
2.Mountedona0.53°C/Wheatsinkwithnoforcedaircooling,airtemperature25°C.
3.Mountedona0.53°C/Wheatsinkwith5m/sforcedaircooling,airtemperature25°C.
4.Basedon100%producontest,duraon2sminimum
Construcon
Ahighintegritydielectriclayerisappliedtoamachined
stainlesssteelsubstrate.Thick-lmconductorandresistor
paernsareprintedandred,thenprotectedwithahigh
temperatureoverglaze.Theterminaonpadsarennedwith
solderandoponalterminalsor���leadsaresolderedon.
PhysicalData
Dimensionsinmm,weightwithoutterminaonsing
L ±0.1 W ±0.1 t ±0.1 ØDnom anom bnom cnom 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 terminaons
tothemounngholecentreis
16.68mm.
Inaddiontothecentralxing
hole, WDBR7 has two corner
holes. These are present for
manufacturing purposes only
andshouldnotbeusedasx-
ingholes.
W
L
c
b
a
Substratethickness =t
D
Resistors
AllPb-freepartscomplywithEUDirecve2011/65/EU(RoHS2)
12.16
General Note
TT Electronics reserves the right to make changes in product specication 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
Ultra Low Prole
Power Resistors
WDBR Series
250mm
3mm
Terminaons
Thefollowingterminaonoponsareavailable
Maximum
Pulsedloadatfull���pulsepowerrang50,000cycles(seeFig1)
Mountedona0.53°C/Wheatsinkwith5m/sforcedaircooling,airtemperature25°C.
ΔR%
5
Derangatheatsinktemperatures>160°C SeeFig.2
ThermalPerformance
1ms
1ms
8s
Ppk
2s
Fig. 1: Duty CycleWaveform
0
20
40
60
80
100
120
050100 150200 250
Heatsink Temperature(°C)
% of Rated Power
Fig.2: TemperatureDerating
PL
WDBR Size ½ 1, 2, 3, 5 & 7
Pad Length, PL 7.5 9.0
Pad Width, PW 4.5 9.0
WDBR Size ½ 1, 2, 3, 5 & 7
Terminal Height, TH 6.8 11
Terminal Width, TW 2.8 6.3
Terminal Thickness, TT 0.8 0.8
PW
Notes:
1. Twooponsexistforsoldertype.ThestandardisSnAg(96SC)whichisPb-freeandthesecond(HT)ishightemperatureHMPalloywhichis
Pb-bearing.BothareRoHScompliant,butthesecondreliesontheRoHSexemponforhightemperaturesoldersandistargetedatspecialist
hightemperatureapplicaons.
TH
TW TT
Opon Code NominalDimensions(mm)
Solderpadonly
1
I
Flyingleads
UL3134/5
40A,600V
L
Push-onconnectors T
12.16
General Note
TT Electronics reserves the right to make changes in product specication 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