Features
Applications
■ Smart meters
■ Renewable energy
■ Industrial
■ Surge withstand IEC 61000-4-5 1.2/50 µs
■ Low thermal resistant ceramic core
■ E24 resistance values
■ RoHS compliant*
■ Wide power range (1~8 W)
■ Power supplies/chargers
■ Lighting
■ Coating material meets UL 94V-0
requirements
■ Instruments/gauges
■ White goods
WS Series High Surge Withstand Wirewound Resistor
Electrical Characteristics
How to Order
Resistance Range................................................ See Popular Resistance Values Table
WS 3 M 22R0 J
Power Rating @ 70 °C
Product Series
WS1M, WS1A........................................................................................................1 W
WS2M, WS2A........................................................................................................2 W
WS3M, WS3A........................................................................................................3 W
WS5M, WS5A........................................................................................................5 W
WS7M, WS7A........................................................................................................7 W
WS8M....................................................................................................................8 W
Tolerance....................................................................................................................5 %
Operating Temperature.........................................................................-55 °C to +200 °C
Temperature Coefficient ..............................................................................± 200 ppmꢀ°C
Maximum Voltage....................................................................................................√P*R
WS = Wirewound, High
Surge Withstand
Power Rating
1 = 1 Watt
2 = 2 Watts
3 = 3 Watts
5 = 5 Watts
7 = 7 Watts
8 = 8 Watts
Pin Style
A = Axial Standard Version
M = Axial Miniaturized Version
Popular Resistance Values
Resistance Code
• R<100 ohms:
“R” represents decimal point
±example: 22R0 = 22 ohms)
• R≥100 ohms:
Code
68R0
1500
1001
3301
R Value
68 Ω
Code
R Value
15R0
20R0
22R0
33R0
47R0
15 Ω
20 Ω
22 Ω
33 Ω
47 Ω
150 Ω
1K Ω
First three digits are significant,
fourth digit represents number of
zeros to follow
3.3K Ω
±example: 1001 = 1K ohms)
Resistance Tolerance
Other E24 resistance values available upon request.
J = ± 5 %
Physical Characteristics
Resistor .................................................................... Low thermal resistant ceramic core
Lead Wire......................................................................................Tin-plated copper wire
Coating Material ............................................................... Meets UL 94V-0 requirements
Environmental Characteristics
Test
Conditions
Specification
Short Time Overload
Solderability
10 times rated power for 5 seconds.
245 ± 3 °C for 2.5 ± 0.5 seconds.
260 ± 5 °C for 10 ± 1 seconds.
ΔR≤± ±5 % ± 0.05 Ω)
Over 95 % coverage
ΔR≤± ±1 % + 0.05 Ω)
Resistance to
Solder Heat
Temperature Cycle
5 cycles, -55 °C ± 3 °C for 30 minutes, Room temperature for
15 minutes, +155 ± 2°C for 30 minutes, Room temperature for
15 minutes
ΔR≤± ±2 % + 0.05 Ω)
Dielectric Strength
Insulation Resistance
Load Life Humidity
Test voltage >500 Vrms for >1 minute.
Test voltage >500 Vrms for 1 minute.
Rated continuous voltage for 1000 hours, 1.5 hours ON and
0.5 hours OFF at 90~95 % relative humidity and test temperature
of 40 °C ± 2 °C.
Pass
>109 Ω
ΔR≤ ± ±5 % + 0.05 Ω)
Load Life
Surge
Rated continuous voltage for 1000 hours, 1.5 hours ON and
0.5 hours OFF at a test temperature of 70 °C ± 2 °C.
1000 hours at rated power.
IEC 61000-4-5 1.2ꢀ50 μs exponential.
ΔR≤± ±5 % + 0.05 Ω)
ΔR≤ ± ±5 % + 0.05 Ω)
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
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