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WHS7 Datasheet Preview

WHS7 Datasheet

Wirewound High Surge Resistors

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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 amended by (EU) 2015/863 (RoHS3)
Electrical Data
Power rating at 25°C
WHS2 / WHSP2R
watts
2
WHS3
3
WHS5
5
WHS7
7
5s overload rating at 25°C
watts
10
15 25 35
Short pulse performance
See Pulse Performance graphs
Resistance range
ohms
1R0-330R
TCR ppm/°C
±200
Isolation Voltage
volts 250
350 500 700
Resistance Tolerance
%
<20R: 5 ≥20R: 1, 2, 5
Standard Values
Thermal Impedance
°C/watt
110
E24 preferred
82 54 35
Ambient temperature range
°C
-55 to +200
No Limiting Element Voltage applies to this series; the Rated Voltage is √(P.R).
*Non inductive (Ayrton Perry) winding
Physical Data
Type
WHS2
WHS3
WHS5
WHS7
WHS10
WHS10N
L max
9.0
14.5
16.5
25.0
51.0
Dimensions (mm) & Weight (g)
D max f min
d max
PCB
mount
centres
3.6 19.80
12.70
5.2 24.55
7.0 23.55
0.81
20.30
22.86
8.8 28.30
31.40
10.5 26.00
11.0
1.01
55.88
Min
bend
radius
1.2
1.5
Wt. nom
0.50
1.10
1.75
4.40
8.80
10.50
d
D
WHS10
WHS10N*
10
50
2R2-330R
5R6-100R
1000
5%
25
Lf
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.
© TT Electronics plc
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
03.20




TT

WHS7 Datasheet Preview

WHS7 Datasheet

Wirewound High Surge Resistors

No Preview Available !

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
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)
Pulse Performance
ΔR%
ΔR%
ΔR%
ΔR%
ΔR%
ΔR%
ΔR%
Maximum
Typical
5 +0.001Ω
3
5 +0.001Ω
3
5 +0.001Ω
1
Zero at 280°C (See Thermal Performance graph).
5 +0.001Ω
2
55/200/56
5 +0.001Ω
1
5 +0.001Ω
1
5 +0.001Ω
1
Surge / Pulse Energy Capacity
(single or low repetition rate, ΔR < 5%)
1000
100
10
1
1
WHS10N
WHS10
WHS7
WHS5
WHS3
10 100
Value (ohms)
WHS2 / WHSP2R
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.
© TT Electronics plc
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
03.20


Part Number WHS7
Description Wirewound High Surge Resistors
Maker TT
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WHS7 Datasheet PDF





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