W21 [TTELEC]
Vitreous Enamelled Wirewound Resistors; 釉瓷线绕电阻器
| 型号： | W21 |
| 厂家： | 
TT Electronics |
| 描述： | Vitreous Enamelled Wirewound Resistors |
| 文件： | 总2页 (文件大小：81K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Vitreous Enamelled
Wirewound Resistors
Welwyn Components
W20 Series
• CECC approved
Suitable for harsh environments
•
Impervious lead free vitreous enamel coating
•
Overload characteristics ideal
for protection circuits
•
High stability and reliability
•
High power dissipation for size
•
Electrical Data
Commercial
W21
3.0
ohms 1R to 10K
W215
5.0
1R to 15K
W22
7.0
1R to 22K
W23
10.0
W24
14.0
Power rating at 25°C
Resistance range at 1% tolerance
2% tolerance
watts
1R to 60K 1R to 100K
ohms 0R5 to 10K 0R5 to 15K 0R5 to 22K 1R to 60K 1R to 100K
ohms 0R1 to 10K 0R1 to 15K 0R1 to 22K 0R15 to 60K 0R2 to 100K
5% tolerance
TCR (-55° to 200°C)
pp/°C
Typically: <+-75
Maximum: +-200
Approved BS CECC 40-201-002
Power rating at 25°C
Power rating at 70°C
Resistance range at 1% tolerance
2% tolerance
Style
watts
watts
JB
2.9
2.5
HB
5.0
4.3
KB
7.0
6.0
LB
10.0
9.0
MB
14.0
12.0
ohms 1R to 10K
1R to 15K
1R to 20K
1R to 56K 1R to 100K
ohms 0R5 to 10K 0R5 to 15K 0R5 to 20K 1R to 56K 1R to 100K
ohms 0R1 to 10K 0R1 to 15K 0R1 to 20K 0R15 to 56K 0R2 to 100K
5% tolerance
TCR (-55° to 200°C)
ppm/°C
≥5 ohms < 10 ohms: 400
≥10 ohms: 200
Applicable to commercial and approved ranges
Limiting element voltage
Standard values
Thermal impedance
Ambient temperature range
volts
100
88
160
200
500
750
22
E24 preferred. Other values to special order
°C/watt
°C
58
44
29
-55 to 200
Physical Data
Dimensions (mm) and Weight (g)
Type
L max
12.7
22.0
22.0
38.0
53.5
D max
5.6
7.0
8.0
8.0
f min
22.75
23.1
23.1
-
d nom
0.8
0.8
0.8
0.8
Wt.nom
W21
W215
W22
W23
W24
1
2
2
3.5
5
d
D
L
f
8.0
-
0.8
400
300
200
100
Construction
W215
W22
W21
W24
W23
A high purity ceramic substrate is assembled with interference fit end caps to which are
welded the termination wires. The resistive element is wound on the substrate and welded to
the caps; the vitreous enamel protective coating is then applied.
Terminations
Material
Strength
Copper clad steel wire, nickel plated and solder-coated.
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.
Length
W23’s and W24’s are not supplied on tape. Minimum lead length is 30 mm.
Marking
0
0
5
10
15
20
The resistors are legend marked with type reference, resistance value and tolerance. Values are
marked in accordance with IEC 62.
Dissipation – Watts
General Note
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 C · 04.03
85
Vitreous Enamelled
Wirewound Resistors
W20 Series
Welwyn Components
Flammability
All materials used in the construction of ‘W’ series resistors
are inorganic and inherently non burning.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Performance Data
CECC 40201-002
Requirements
Actual Performance
Maximum
Typical
3.5
Load at commercial rating: 1000 hrs at 25°c
Load at CECC rating: 1000 hours at 25°c
Dry heat: 1000 hours at 200°c
Shelf life: 12 months at room temperature
Derating
∆R%
∆R%
∆R%
∆R%
5
5
5
3.5
5
2
1
not specified
0.03
0.02
see derating curve
Short term overload
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
µv/v
1
1.0
0.5
0.2
0.2
Climatic
5
Climatic category
55/200/56
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
5
0.05
0.5
0.02
0.2
1
1
0.25
0.03
1
0.25
0.05
Noise (in decade of frequency)
Robustness
not specified
1
zero
zero
∆R%
ohms
volts
0.4
0.05
Insulation resistance
not specified
not specified
>.1G ohm
500 min
>.1G ohm
500 min
Voltage Proof
Pulse handling
data available by request
Application Notes
Packaging
The termination should not be bent closer than 1.6mm from
the body, and the recommended minimum bend radius is
1.2mm. The terminations are solderable to within 4mm from
the body. When cold, vitreous enamel has excellent insulation
resistance. In common with all insulants the specific resistance
of the enamel decreases with increase in temperature.
Therefore, resistors operated at near maximum temperature
cannot be classed as insulated and should not be used in
contact with any conducting material. Care must be taken
when determining clearance distance between the resistor
body and the printed circuit board or other components to
ensure these are not over heated. Resistance is measured
6mm from body.
For W21 and W215 the standard method of packaging is
taped in Ammo Packs. For W22 the standard method of
packaging is taped and reeled. Alternatives available by
special request are detailed in the table below. W23’s and
W24’s are available only as loose packed in boxes. W series
resistors can be supplied preformed. Contact factory for
details.
10
f1
f2
f1 – f2 ≤ 1.4 mm
b
6
6
116
100
Derating Curve
Standard Quantities Per Package
Type
W21
1000
1000
n/a
W215
750
750
n/a
W22
500
700
n/a
W23
n/a
W24
n/a
54
0
Ammo pack
Reel
n/a
n/a
Small box
50
25
25
70
200
315
Type
W21
W215
W22
b
Ambient temperature °C
63 2
73 2
73 2
© 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 C · 04.03
86
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