Enhanced surge & pulse energy capacity
UL94-V0 ameproof protecon
Radial taped form available
Surface mount ZI-form opon
Non inducve type available
Dimensions (mm) & Weight (g)
Type L max D max f min d max
PCB
mount
centres
Min
bend
radius
Wt. nom
WHS2 9.0 3.6 19.80
0.81
12.70
1.2
0.50
WHS3 14.5 5.2 24.55 20.30 1.10
WHS5 16.5 7.0 23.55 22.86 1.75
WHS7 25.0 8.8 28.30 31.40 4.40
WHS10 51.0 10.5 26.00 1.01 55.88 1.5 8.80
WHS10N 11.0 10.50
WHS2 / WHSP2R WHS3 WHS5 WHS7 WHS10 WHS10N*
Power rang at 25°C was 2 3 5 7 10
5s overload rang at 25°C was 10 15 25 35 50
Short pulse performance See Pulse Performance graphs
Resistance range ohms 1R0-330R 2R2-330R 5R6-100R
TCR ppm/°C ±200
Isolaon Voltage volts 250 350 500 700 1000
Resistance Tolerance % <20R: 5 ≥20R: 1, 2, 5 5%
Standard Values E24 preferred
Thermal Impedance °C/wa 110 82 54 35 25
Ambient temperature range °C -55 to +200
Construcon
A high purity ceramic substrate is assembled with interference t end caps to which are welded the terminaons. The resisve element
is wound on the substrate and welded to the caps. Flameproof silicone cement coang is applied prior to marking with indelible ink. The
components are then leadformed if required and packed.
Electrical Data
Physical Data
No Liming Element Voltage applies to this series; the Rated Voltage is √(P.R).
*Non inducve (Ayrton Perry) winding
f
D
d
L
03.20
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)
WHS Series
Resistors
Wirewound High Surge Resistors
Maximum Typical
Load at rated power: 1000hrs @ 25°C ΔR% 5 +0.001Ω 3
Dry heat: 1000hrs @ 200°C ΔR% 5 +0.001Ω 3
Short term overload ΔR% 5 +0.001Ω 1
Derang from rated power @25°C Zero at 280°C (See Thermal Performance graph).
Climac ΔR% 5 +0.001Ω 2
Climac category 55/200/56
TRC & Vibraon ΔR% 5 +0.001Ω 1
Robustness & solder heat ΔR% 5 +0.001Ω 1
Long term damp heat (56 days) ΔR% 5 +0.001Ω 1
Terminaons
Material: Hot n dipped copper wire
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
Marking
WHS2, WHSP2R and WHS3 resistors are marked with four colour bands in conformance with IEC62.
The larger sizes are legend marked with type reference, resistance value and tolerance.
Flammability
The resistor coang will not burn or emit incandescent parcles under any condion of applied temperature or power overload.
Solvent Resistance
The body protecon and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
Performance Data
Pulse Performance
1
10
100
1000
110 100 1000
Energy (joules)
Value (ohms)
Surge / Pulse Energy Capacity
(single or low repetition rate, ΔR < 5%)
WHS10N
WHS10
WHS7
WHS5
WHS3
WHS2 / WHSP2R
03.20
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
WHS Series
Wirewound High Surge Resistors
Applicaon Notes
1. If the resistors are to dissipate full rated power, it is recommended that the terminaons should not be soldered closer than
4mm from the body.
2. Due to operang temperature limits imposed by some PCB materials, derang may be necessary. The surface temperature rise
at the centre of the body is shown under Thermal Performance.
3. WHS2, WHS3, WHS5 resistors can also be supplied with goalpost or lancet pre-formed leads. Hairpin form is available on WHS2 and
WHS3 only. For details see
hps://www.electronics.com/TTElectronics/media/ProductFiles/Resistors/ApplicaonNotes/TN008-resistors-Leadform-Capability.pdf.
WHS2, WHS3, and WHS5 are also available in an SMD format with ZI formed leads and packed in blister tape. For details see
hps://www.electronics.com/TTElectronics/media/ProductFiles/Resistors/Datasheets/ZI-form.pdf
Thermal Performance
WHS10N WHS10
WHS7
WHS5
WHS3
WHS2 / WHSP2R
Proportion of Rated Power (%)
Temperature Rise (°C)
Derating Curve Body Temperature Rise
Ambient Temperature °C Power (W)
WHS10(N)
WHS3
WHS5
WHS7 WHS10(N)
WHS2-7
03.20
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
WHS2 /
WHSP2R
WHS Series
Wirewound High Surge Resistors
Hairpin Goalpost Lancet ZI-form
03.20
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
Also a 2W and 3W radial taped version is available as shown below
* Although body dimensions dier slightly, WHSP2R Performance and Electrical Data are idencal to those of WHS2
Radial Taped Dimensions (mm)
Dimension Notaon WHSP2R* WHS3R
Component body length L10.0 Max 14.5 Max
Component body diameter D4.0 Max 5.8 Max
Terminal lead diameter d0.8 Nom
Component pitch P12.7±0.5 12.7±1.0
Hole pitch Po 12.7±0.2 12.7±0.3
Component to hole oset P1 3.85±0.3 3.85±0.7
P2 5.85±0.5 6.35±1.3
Lead pitch F 5.0
+0.75 -0.34 5.0±1.0
Width of backing strip W 18.0±0.3 18.0±1.0
Posion of hole W1 9.0±0.25 9.0±0.5
Diameter of hole Do 4.0±0.3
Height to lead form Ho 16.0±0.3 17.0±1.0
Height from lead form Ho1 17.0 Max 23.0 Max
Height to resistor Ho2 18.0 Min
Width of adhesive tape W0 15.0±0.5
Length of protrusion l<2.5
Form dimensions
K1 2.0±0.3
K2 3.0±0.5
K3 1.5±0.25
K4 1.0±0.2
K5 -- 2.0 Min
WHS Series
Wirewound High Surge Resistors
Dimensions mm a b c
WHS2 6 52 5
WHS3 6 67 10
WHS5 6 63 10
WHS7 6 85 10
WHS10 9 105 10
WHS10N 9 105 20
Dimensions mm a b c
WHS7U 6 95 10
Ordering Procedure
Example: WHS2-100RJA25 (WHS2, 100 ohms ±5%, Pb-free)
Packaging
The standard packaging for WHS is taped. The crical dimensions are shown below. The component wires will not protrude beyond
the outside edge of the tapes. Taped product is then packed into boxes or onto reels. See Ordering Procedure for details. Alternave
packaging is available by request. Pre-formed resistors are supplied loose packed in plasc bags or boxes.
Changes to Packaging
Remove text from table and replace image:
a
b
c
6
52
5
6
67
10
6
63
10
6
85
10
9
105
10
9
105
20
*An offset lead length is available for WHS7 series.
Consult factory for details
Add new table below:
a
b
c
6
95
10
Ordering Procedure
Example: WHS2-100RJA25 (WHS2, 100 ohms ±5%, Pb-free)
W
H
S
2
-
1
0
0
R
J
A
2
5
1
2
3
4
5
1
2
3
4
5
Type Variant Value Tolerance
Packing
WHS2
U = unequal
lead length
(WHS7 only)
3/4 characters
F = ±1%
A25
WHS2
Ammo pack, 2500/box
WHS3
R = ohms
G = ±2%
A1
WHS3
Ammo pack, 1000/box
WHS5
J = ±5%
T075
WHS5
Tape & reel, 750/reel
WHS7
N = non-
inductive
(WHS10 only)
T07
WHS7(U)
Tape & reel, 700/reel
WHS10
A02
WHS10
Ammo pack, 200/box
A01
WHS10N
Ammo pack, 100/box
03.20
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
ULW ADDITIONAL
Example: ULWP2R-33RJT15 (ULWP2R radially formed & taped, 33 ohms ±5%, Pb-free)
WHS ADDITIONAL
Example: WHSP2R-100RJT15 (WHSP2R radially formed & taped, 100 ohms ±5%, Pb-free)
MFP REPLACEMENT
Example: MFP2-4K7FI (MFP2, 4.7 kilohms ±1%, Pb-free)
U
L
W
P
2
R
-
3
3
R
J
T
1
5
1
2
3
4
5
1
2
3
4
5
Type Leadforming Value Tolerance Packing
ULWP2
R = Radial taped
3/4 characters
J = ±5%
T15
Tape & reel, 1500/reel
R = ohms
W
H
S
P
2
R
-
1
0
0
R
J
T
1
5
1
2
3
4
5
1
2
3
4
5
Type Leadforming Value Tolerance Packing
3/4 characters
M
F
P
2
-
4
K
7
F
I
1
2
3
4
5
1
2
3
4
5
Type Leadforming Value Tolerance Packing
MFP1
Blank = Axial
3/4 characters
F = ±1%
I
MFP1
Ammo
5000/box
MFP2
R = Radial taped
(MFP2 only)
R = ohms
G = ±2%
MFP2
2000/box
K = kilohms
J = ±5%
T15
MFP2R
Reel
1500/reel
M = megohms
R = ohms
WHSP2
WHS3
R = Radial taped
J = ±5%
G = ±2%
F = ±1% T15 WHSP2R Tape & reel
Tape & reel
Ammo pack
1500/reel
1000/reel
2000/box
WHS3R
A2
T1
Example: WHSP2R-100RJT15 (WHSP2R radially formed & taped, 100 ohms ±5%, Pb-free)
WHS Series
Wirewound High Surge Resistors