W30 [TTELEC]
Cement Coated Wirewound Resistors; 水泥涂层线绕电阻器
| 型号： | W30 |
| 厂家： | 
TT Electronics |
| 描述： | Cement Coated Wirewound Resistors |
| 文件： | 总2页 (文件大小：116K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Cement Coated
Wirewound Resistors
Welwyn Components
W30 Series
• Values down to 10m ohms
Tolerance to 1%
•
Flameproof protection
•
Custom built to meet pulse requirements
•
Electrical Data
W31
3.0
Notes
Power rating at 25°C
Power rating at 70°C
Resistance range
watts
watts
ohms
ppm/°C
%
2.5
0R01 to 10K
See below
TCR (-55 to 155°C)
Resistance tolerance
Standard values
5 2 1
E24 series preferred
83
Other values to special order
Thermal impedance
Ambient temperature range
Limiting element voltage
TCR
°C/watt
°C
-55 to 155
100
volts
ppm/°C
0.01 ohms <1000
0.033 ohms <500
0.091 ohms <200
10 ohms <150
10K ohms <100
Physical Data
Maximum Dimensions (mm) and Weight (g)
Type
L max.
13
D max.
5.6
f min.
22.75
d nom.
0.8
Wt.nom.
1.0
d
D
L
W31
f
Construction
A high quality ceramic substrate is assembled with
interference fit end caps to which are welded the element
winding and termination wires. The protection is then applied
to the body, providing an effective seal which is impervious to
moisture, shock, vibration, fungus and salt spray.
Marking
W31 resistors are legend marked with type reference,
resistance value and tolerance. Values are marked in
accordance with IEC 62.
Solvent Resistance
The body and marking are resistant to all normal industrial
Terminations
Material
cleaning solvents suitable for printed circuits.
Solder coated copper.
Strength
The terminations meet the requirements of
IEC 68.2.21.
Flammability
The resistor coating will not burn under any condition of
Solderability
General Note
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
applied temperature or component overload.
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Issue D · 07.06
99
Cement Coated
Wirewound Resistors
W30 Series
Welwyn Components
Performance Data
Maximum
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
Typical
3.5
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
∆R%
∆R%
∆R%
3.5
3.5
see derating curve
∆R%
∆R%
5.0 + .001Ω
5.0 + .001Ω
1.0
3.5
Climatic category
55/200/56
Long term damp heat: 56 days
Temperature rapid change
Resistance to solder heat
Vibration and bump
∆R%
∆R%
∆R%
∆R%
volts
3.0 + .001Ω
2.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
1.0
1.5
2.0
2.0
Voltage proof
500 min
Pulse handling
Data available by request
W31 Series Derating Curve
130
120
110
100
90
80
70
60
50
40
30
20
10
0
20 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
1.2mm.
10
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.
f1
f2
63
6
6
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.
Standard Quantities Per Package
Type
W31
1000
1000
Ammo pack
Reel
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Issue D · 07.06
100
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