W30 Datasheet, PDF (2/2 Pages) Welwyn Components Limited – Cement Coated Wirewound Resistors

Cement Coated
Wirewound Resistors
W30 Series
Welwyn Components
Performance Data
Load: 1000 hrs 3 watts @ 25°C
1000 hrs 2.5 watts @ 70°C
Dry heat: 1000 hrs at 200°C
Derating from room temperature
Short term overload 10 x rated power for 5 seconds
Climatic
Climatic category
Long term damp heat: 56 days
Temperature rapid change
Resistance to solder heat
Vibration and bump
Voltage proof
Pulse handling
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
volts
Maximum
Typical
5.0 + .001Ω
3.5
5.0 + .001Ω
3.5
5.0 + .001Ω
3.5
see derating curve
5.0 + .001Ω
1.0
5.0 + .001Ω
3.5
55/200/56
3.0 + .001Ω
1.0
2.0 + .001Ω
1.5
5.0 + .001Ω
2.0
5.0 + .001Ω
2.0
500 min
Data available by request
130
120
110
100
90
80
70
60
50
40
30
20
10
0
20
W31 Series Derating Curve
40 60 80 100 120 140 160 180 200 220 240 260 280
Temp
Application Notes
The terminations should not be bent closer than 1.6mm from
the body, and the recommended minimum bend radius is
10
1.2mm.
Care must be taken when determining clearance between the
resistor body and the P.C.B. or other components. Resistance
is measured 6mm from body.
Packaging
The standard method of packaging is taped in ammo packs.
Can be provided on reels by request.
W31 resistors can be supplied preformed.
Contact factory for details.
f₁
6
63
f₂
6
f₁ – f₂ ≤ 1.4 mm
Standard Quantities Per Package
Type
Ammo pack
Reel
W31
1000
1000
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
100
Issue D · 07.06