Aluminium Housed
Wirewound Resistors
WH Series
Highpowerdissipaonupto300W
Allweldedconstrucon
Suitableforsevereenvironments
Designedforexcellentthermalconducvitytoheatsink
Spadeterminalopon
RoHScompliant
Resistors
07.18
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
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
AllPb-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)AllPb-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
WH5 WH10 WH25 WH50 Notes
Power rang at 25°C was 10 15 252501,2 Onstandardheatsink
Resistance range ohms 0R01to10K 0R01to20K 0R01to44K 0R015to120K
TCR (-55° to 200°C) ppm/°C <10R:±75≥10Rto<100R:±50≥100R:±25
Resistance tolerance % 1(F),2(G),5(J)and10(K)
Low value limits ohms 1Rat1%0R5at2%0R05at5%0R01at10% WH500R015at10%
Isolaon voltage volts 1500 1500 3000 3000 DCorACpeak
Electrical Data
Note1:Forloadatfullrangmountonaluminiumheatsink30.5cmx30.5cmx1.5mm Note2:WH25T&WH50Tareaddionallyratedat15A
CECC 40203-006 Requirements * AA BA CA DA Notes
Power rang at 25°C was 10 15 25 40 Onstandardheatsink
Resistance range ohms 0R05to3K4 0R05to15K 0R05to33K 0R05to82K
TCR (-55° to 200°C) ppm/°C ≥5Rto≤10R:±100>10R:±50
Resistance tolerance % 1(F),2(G),and5(J)
Low value limits ohms 1Rat1%0R5at2%0R05at5%
Isolaon voltage volts 1000 1000 2000 2000 DCorACpeak
*ThistableindicatestheCECCspecicaonrequirementswhicharemetorexceededbythecorrespondingWHseriesproducts
Liming element voltage volts 150 250 500 1250 DCorACrms
Standard values E24preferredrange Othervaluestoorder
Thermal impedance °C/wa 16.0 10.0 6.0 3.5 Onstandardheatsink
Ambient temperature range °C -55to200
WH100 WH200 WH300 Notes
Power rang at 25°C was 100 200 300 Onstandardheatsink
Resistance range ohms 0R01to70K 0R01to50K 0R01to68K
TCR (-55° to 200°C) ppm/°C ≤1K0:±100>1K0:±25
Resistance tolerance % Standard5(J)and10(K).Alsoavailable:1(F)and2(G)
Low value limits ohms Typically≥0R05:±5%≤0R047:±10%
Isolaon voltage volts 6360 7070 7070 DCorACpeak
Liming element voltage volts 1900 1900 2500 DCorACrms
Standard values E24preferredrange Othervaluestoorder
Thermal impedance °C/wa 1 0.7 0.6 Onstandardheatsink
Ambient temperature range °C -55to200
Aluminium Housed
Wirewound Resistors
WH Series
07.18
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
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Dimensions (mm) & Weight (g)
WH5, 10, 25 & 50
Type A
Max
B
±0.3
C
±0.3
E
Min
F
Max
G
Max
H
Dia ±0.2
L
Max
M
±0.5
N
Max
Dt
Min
Wt
Nom
WH5 30 12.4 11.3 1.9 17 9 2.4 17.0 4.3 1.8 2.5 3.6
WH10 36.5 15.9 14.3 1.9 21 11 2.4 21.0 5.2 2.2 2.9 5.6
WH25 51119.8 18.3 2.8 28 15 3.3 29.0 7.2 2.6 4.3 13
WH50 72.5221.4 39.7 2.8 30 16 3.3 51.0 7.9 2.6 5.1 29
Physical Data
WH100, 200 & 300
A
Max
B
Max
C
Max
D
Max
E
Max
F
±0.3
G
±0.3
H
Max
J
Max
K
Max
L
Nom 3
M
Max
Dt
Min
Wt.
Nom
WH100 47.5 88 24.1 27.3 65.2 35 37 11.8 15.4 3.7 4.4 - 7.0 115
WH200 72.5 145.7 41.8 45.5 89.7 70 57.2 20.5 10.4 5.5 5.1 103.4 15 475
WH300 72.5 184.4 41.8 45.5 127.7 104 59 20.5 12.4 5.5 6.6 141.4 15 700
Note1:AmaxforWH25Tis71.3 Note2:AmaxforWH50Tis95.5 Note3:WH100:±0.25,WH200&300:±0.45
End face tracking distance = Dt
WH100
WH200 & 300
WH5
, 10, 25 &
50
Spade terminal on
WH25T & WH50T
Nominal dims in mm
Construcon
Capandleadassembliesareedtoahighpurity
ceramicsubstrate.Theresisveelementiswoundonto
thesubstrateandweldedtothecaps.Thewoundrodis
thenmouldedandedintoaluminiumhousingtogive
opmumstabilityandreliability.
Marking
Theresistorsarelegendmarkedwithtypereference,
resistancevalueandtolerancewhichwillwithstandall
acceptedindustrialcleaninguids.Valuesaremarked
inaccordancewithIEC62.
Aluminium Housed
Wirewound Resistors
WH Series
07.18
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
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Terminaons
WH5-100
Material Pb-freesolderdipped,coppercladsteel
Strength Theterminaonsmeettherequirements
ofIEC68.2.21
Solderability Theterminaonsmeettherequirements
ofIEC115-1,clause4.17.3.2
WH25T & 50T 6.35mm(¼“)spadeterminal
WH200 & 300
Material M6threadedsteelterminalwitha
setoffournutsandwashers
Strength Terminaonrobustness50Nmax
Tighteningtorque5Nmmax
Performance Data
WH5, 10, 25 & 50 WH100, 200 & 300
CECC 40203-006
Requirements
Actual Maximum
Maximum Typical
Load at commercial rang: 1000hrs at 25°C ΔR% 1 1 0.4 2
Load at CECC rang: 1000hrs at 25°C ΔR% 1 1 0.4 N/A
Dry heat: 1000hrs at 200°C ΔR% 1 1 0.4 2
Derang from 25°C Zeroat200°C,seederanggraph
Short-term overload ΔR% 1 1 0.2
Climac sequence ΔR% 1 1 0.4
Climac category 55/200/56
Long-term damp heat ΔR% 1 0.5 0.2
Temperature rapid change ΔR% 0.25 0.25 0.1 0.25
Resistance to solder heat ΔR% 0.25 0.25 0.05 WH100:0.5
Vibraon and bump ΔR% 0.25 0.25 0.025
Noise (in decade of frequency) μV/V Notspecied 0 0 0
Insulaon resistance ohms 1Gmin 10Gmin
Pulse and overload performance Notspecied See graphs
1
10
0.1 1 10 1001000
Overload Duration (s)
Multiple of Rated Power
WH5&10
WH100-300
WH25-300
WH5-50
0.1
1
10
100
1000
10000
0.01 0.1 1 10 100100010000 100000
Value (ohms)
WH5
WH10
WH25
WH50
WH100
WH200
WH300
Pulse and Overload Performance
For short durations of ≤0.1s the energy graph should
be used. For longer durations the overload graph
applies.
Note:A0.05ohmaddionistobeaddedtotheperformanceofallresistors<10ohms.
Applicaon Notes
Aersoldering,careshouldbetakentoensurethattherearenouxresiduesontheendfacesofthemoulding
compound,otherwiseinsulaonresistancewillbereduced.Theminimumsurfacetrackingdistancesfromterminaon
tocasingareshowninthePhysicalDatatablesasdimensionDt.
Itisrecommendedthattheresistorbaseshouldbecoatedthinlywithheatsinkcompoundbeforemounngtoobtain
thestatedoperangcharacteriscs.Theheatsinkcompoundincreasesthermalconducvitytotheheatsink.
1
10
100
1000
1 10 100 1000 10000
Heatsink Surface Area (cm
2
)
Ma xim um Dissipa tion (W)
WH10/BA 70
°C
WH10/BA 25
°C
WH5/AA 70
°C
WH5/AA 25
°C
WH25/CA 70
°C
WH25/CA 25
°C
DA 70
°C
DA 25
°C
WH50 25
°C
WH100 70
°C
WH100 25
°C
WH200 70°C
WH200 25
°C
WH300 70
°C
WH300 25
°C
Derating for reduced heatsink dimensions
0
20
40
60
80
1 0 0
1 2 0
0 1 0 0 2 0 0
A m b ie n t T e m p e r a tu r e (° C )
Proportion of Pr (%)
Derating for ambient temperature
I
WH5, 10
Bulk
250/box
Standard
WH25, 50 200/box
WH100 45/box
WH200, 300 10/box
The following options apply toWH5, 10, 25 & 50 only:
For CECC released product state on order the CECC number and style. Example: WH25-3K3JI CECC40203-006 CA
For SnPb nish instead of Pb-free replace the packing su󰀩x with PB. Example: WH25-3K3JPB
Aluminium Housed
Wirewound Resistors
WH Series
07.18
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
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Type (CECC) Thickness (mm) Area (cm²)
WH5 (AA) 1 410
WH10 (BA) 1 410
WH25 (CA) 1 544
WH50 (DA) 1 544
WH50 @ 50W 1.5 930
WH100 3 1000
WH200 3 3800
WH300 3 5800
Thestandardaluminiumheatsinksaredenedinthetablebelow.Ifsmallerheatsinksareusedthenderangshould
beappliedasindicatedinthegraphbelow.Ifnoheatsinkisemployed,usetherangsfor1cm2.
Reference heatsink dimensions
W H 2 5 T – 1 0 0 R J I
Type
Termination
Standard
T Spade terminal
Value (use IEC62 code)
Tolerance (use IEC62 code)
F 1% J 5%
G 2% K 10%
Packing
Ordering Procedure
Example:WH25withspadeterminalsat100ohmswitha5%tolerance:
Packaging
WHresistorsarepackedinplascbagsandboxed.