Resistors
Wirewound High
Surge Resistors
WHS Series
Enhanced surge & pulse energy capacity
UL94-V0 flameproof protection
Radial taped form available
Surface mount ZI-form option
Non inductive type available
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
WHS2 / WHSP2R
Power rating at 25°C
5s overload rating at 25°C
Short pulse performance
Resistance range
TCR
Isolation Voltage
Resistance Tolerance
Standard Values
Thermal Impedance
Ambient temperature range
°C/watt
°C
110
82
ohms
ppm/°C
volts
%
250
350
500
<20R: 5 ≥20R: 1, 2, 5
E24 preferred
54
-55 to +155
35
25
watts
watts
2
10
WHS3
3
15
1R0-330R
±200
700
1000
5%
WHS5
5
25
WHS7
7
35
2R2-330R
WHS10
10
50
5R6-100R
WHS10N*
See Pulse Performance graphs
No Limiting Element Voltage applies to this series; the Rated Voltage is √(P.R).
*Non inductive (Ayrton Perry) winding
Physical Data
Dimensions (mm) & Weight (g)
Type
WHS2
WHS3
WHS5
WHS7
WHS10
WHS10N
L max
9.0
14.5
16.5
25.0
51.0
D max
3.6
5.2
7.0
8.8
10.5
11.0
f min
19.80
24.55
23.55
28.30
26.00
1.01
0.81
d max
PCB
mount
centres
12.70
20.30
22.86
31.40
55.88
1.5
1.2
Min
bend
radius
Wt. nom
0.50
1.10
1.75
4.40
8.80
10.50
d
D
L
f
Construction
A high purity ceramic substrate is assembled with interference fit end caps to which are welded the terminations. The resistive element
is wound on the substrate and welded to the caps. Flameproof silicone cement coating is applied prior to marking with indelible ink. The
components are then leadformed if required and packed.
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
3.17
Wirewound High Surge Resistors
WHS Series
Terminations
Material: Hot tin dipped copper wire
Strength:
The terminations meet the requirements of IEC 68.2.21
Solderability:
The terminations 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.
Solvent Resistance
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
Flammability
The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload.
Performance Data
Maximum
Load at rated power: 1000hrs @ 25°C
Dry heat: 1000hrs @ 200°C
Short term overload
Derating from rated power @25°C
Climatic
Climatic category
TRC & Vibration
Robustness & solder heat
Long term damp heat (56 days)
ΔR%
ΔR%
ΔR%
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
ΔR%
ΔR%
ΔR%
ΔR%
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
55/200/56
1
1
1
Typical
3
3
1
2
Zero at 280°C (See Thermal Performance graph).
Pulse Performance
Surge / Pulse Energy Capacity
(single or low repetition rate, ΔR < 5%)
1000
Energy (joules)
100
10
1
WHS10N
WHS10
WHS7
WHS5
WHS3
WHS2 / WHSP2R
1
10
Value (ohms)
100
1000
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
3.17
Wirewound High Surge Resistors
WHS Series
WHS10N
WHS10
WHS7
WHS5
WHS3
WHS2 / WHSP2R
Thermal Performance
Derating Curve
Proportion of Rated Power (%)
Body Temperature Rise
WHS2 / WHS3
WHSP2R
WHS5
WHS7
WHS10(N)
WHS10(N)
WHS2-7
Ambient Temperature °C
Temperature Rise (°C)
Power (W)
Application Notes
1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than
4mm from the body.
2. Due to operating temperature limits imposed by some PCB materials, derating 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.
WHS2, WHS3, and WHS5 are also available in an SMD format with ZI formed leads and packed in blister tape.
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
3.17
Wirewound
For the purpose of UL
Resistors
High Surge
approval, the following points should be observed:
3.
WHS Series
2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An estimate of the
temperature rise to be expected at the center of the body can be calculated using the thermal impedance figures given under
Electrical Data.
3.1 To protect against fire under all conditions of overload, a positive clearance of at least 13mm should be provided
between the body of the resistor and any combustible materials.
3.2 A positive clearance of 13mm should be provided between the resistor body or terminations and uninsulated parts of
opposite polarity or uninsulated dead metal parts.
3.3 Limited Short Circuit testing should be performed in the complete appliance.
4. ULW resistors can also be supplied with radial, goalpost or lancet pre-formed leads. In particular ULW2, ULW3, ULW4 and
Hairpin
are available in ZI-form SMD format packed in blister tape – see
Goalpost
Lancet
ZI-form
ULW5
(This diagram exists on WP-S,
http://www.ttelectronics.com/sites/default/files/resistors-datasheets/ZI-form.pdf
so just copy it)
Also a 2W radial taped version* is available as shown below
WHSP2R Radial Taped Dimensions (mm)
Also a 2W radial taped version* is available as shown below.
Notation Nominal
Tolerance
Dimension
Component Body Length
Radial Taped Dimensions (mm)
Max
L
10.0
ULWP2R
Component Body Diameter
D
Dimension
Notation
4.0 Max
Nominal
Tolerance
Component Body Length
L
10.0 Max
Terminal Lead Diameter
d
0.8 Nom
Component Body Diameter
D
4.0 Max
Component Pitch
P
12.7
±0.5
Terminal Lead Diameter
d
0.8 Nom
Pitch of Holes
Po
12.7
±0.2
Component Pitch
P
5
±0.5
P1
3.85
±0.3
Pitch of
& Component
Holes
Po
10
±0.2
Distance between Hole
P2
5.85
±0.5
P1
3.85
±0.3
Distance between Hole &
Lead Pitch
F
P2
5.0
+0.75 -0.34
Component
5.85
±0.5
Width of Backing
Lead Pitch
Strip
W
F
18.0
±0.3
5.0
+0.75 -0.34
Position of Hole
Width of Backing Strip
W1
9.0
±0.25
W
18.0
±0.3
W1
9.0
±0.25
Diameter of Hole
Position of Hole
Do
4.0
±0.3
Diameter of Hole
Do
4.0
±0.3
Height to Lead Form
Ho
16.0
±0.3
Ho
16.0
±0.3
Height from Lead
Height to Lead Form
Form
Ho1
21.7 Max
Height from Lead Form
Ho1
17.0 MAX
Height to Resistor
Ho2
18.0 Max
Height to Resistor
Ho2
18.0 MIN
Width of Adhesive Tape
W2
15.0
±0.5
Width of Adhesive Tape
W2
15.0
±0.5
Length of protrusion
l
<2.5
Length of protrusion
l
<2.5
K1
2.0
±0.3
K1
2.0
±0.3
K2
3.0
±0.5
K2
3.0
±0.5
Form Dimensions
Form Dimensions
K3
1.5
±0.25
K3
1.5
±0.25
K4
1.0
±0.2
K4
1.0
±0.2
*Although body dimensions differ slightly, WHSP2R Performance and Electrical Data are identical to those of WHS2
*Although body dimensions differ slightly, ULWP2R Performance and Electrical Data are identical to those of ULW2
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
3.17
Wirewound High Surge Resistors
WHS Series
Changes to Packaging
Remove
text
from table and replace image:
Packaging
The standard packaging for WHS is taped. The critical dimensions are shown below. The component wires will not protrude beyond
the outside edge
a
Dimensions mm
of the tapes. Taped product is then packed into boxes or onto reels. See Ordering Procedure for details. Alternative
b
c
packaging is available by request. Pre-formed resistors are supplied loose packed in plastic bags or boxes.
WHS2
6
52
5
WHS3
6
67
10
Dimensions mm
a
b
c
WHS5
6
63
10
*WHS7
6
85
6
10
WHS2
52
5
WHS10
9 105 10
WHS3
6
67
10
WHS10N
9 105 20
63
85
105
105
c
*An offset lead length is available for WHS7 series.
WHS5
6
Consult factory for details
10
10
10
20
WHS7
WHS10
6
9
9
b
Add new table below:
WHS10N
Dimensions mm
a
WHS7U
Dimensions mm
6
95
a
10
b
c
WHS7U
6
95
10
ULW ADDITIONAL
Example: ULWP2R-33RJT15
(ULWP2R radially formed & taped, 33 ohms ±5%, Pb-free)
Ordering Procedure
U
L W P 2 R
W
1
H
S
2
1
2
3
4
Example: WHS2-100RJA25
(WHS2, 100
100 ohms ±5%, Pb-free)
Example: WHS2-100RJA25 (WHS2,
ohms ±5%, Pb-free)
2
-
1
0
3
0
3
Value
R
J
A
4
2
-
3
Ordering Procedure
3
R
J
T
1
5
5
5
5
Packing
T15 Tape & reel, 1500/reel
5
Packing
Type
1
Leadforming
2
4
5
Tolerance
ULWP2 R = Radial taped 3/4 characters
1
2
3
R = ohms
4
Type
Variant
Value
WHS2
WHS3
WHS5
WHS7
WHS10
U = unequal
lead length
(WHS7 only)
3/4 characters
R = ohms
J = ±5%
Tolerance
F = ±1%
G = ±2%
J = ±5%
A25
A1
T075
T07
A02
A01
WHS ADDITIONAL
N = non-
inductive
(WHS10 only)
WHS2
WHS3
WHS5
WHS7(U)
WHS10
WHS10N
Ammo pack, 2500/box
Ammo pack, 1000/box
Tape & reel, 750/reel
Tape & reel, 700/reel
Ammo pack, 200/box
Ammo pack, 100/box
Example: WHSP2R-100RJT15
(WHSP2R radially formed & taped, 100 ohms ±5%, Pb-free)
Example: WHSP2R-100RJT15
(WHSP2R radially formed & taped, 100 ohms ±5%, Pb-free)
W
H
S
1
1
Type
2
Leadforming
P
2
R
2
3
Value
-
1
0
3
4
Tolerance
F = ±1%
G = ±2%
J = ±5%
0
R
J
4
T
1
5
5
Packing
T15 Tape & reel, 1500/reel
5
WHSP2 R = Radial taped 3/4 characters
R = ohms
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT
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Electronics plc
3.17
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