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參數資料
| 型號： | W21-91RJI |
| 英文描述： | RESISTOR 91R 3W |
| 中文描述： | 電阻91R 3W |
| 文件頁數： | 1/2頁 |
| 文件大小： | 106K |
| 代理商： | W21-91RJI |
Electrical Data
Commercial
Power rating at 25°C
Resistance range at
W21
3.0
1 to 10k
0.5 to 10k
0.1 to 10k
W215
5.0
1 to 15k
0.5 to 15k
0.1 to 15k
Typically: <+75
W22
7.0
1 to 22k
0.5 to 22k
0.1 to 22k
W23
10.0
1 to 60k
1 to 60k
0.15 to 60k
Maximum: +200
W24
14.0
1 to 100k
1 to 100k
0.2 to 100k
watts
ohms
ohms
ohms
pp/°C
1% tolerance
2% tolerance
5% tolerance
TCR (-55° to 200°C)
Approved BS CECC 40-201-002
Power rating at 25°C
Power rating at 70°C
Resistance range at
Style
watts
watts
ohms
ohms
ohms
ppm/°C
JB
2.9
2.5
HB
5.0
4.3
KB
7.0
6.0
LB
10.0
9.0
1 to 56k
1 to 56k
0.15 to 56k
≥
10 ohms: ±200
MB
14.0
12.0
1% tolerance
2% tolerance
5% tolerance
1 to 10k
0.5 to 10k
0.1 to 10k
1 to 15k
0.5 to 15k
0.1 to 15k
1 to 20k
0.5 to 20k
0.1 to 20k
1 to 100k
1 to 100k
0.2 to 100k
TCR (-55° to 200°C)
≥
5 ohms < 10 ohms: ±400
Applicable to commercial and approved ranges
Limiting element voltage
Standard values
Thermal impedance
Ambient temperature range
Physical Data
Dimensions (mm) & weight (g)
Type
L max
D max
W21
12.7
W215
22.0
W22
22.0
W23
38.0
W24
53.5
volts
100
E24 preferred. Other values to special order
88
58
160
200
500
750
°C/watt
44
29
22
°C
-55 to 200
f min
22.75
23.1
23.1
-
-
d nom
0.8
0.8
0.8
0.8
0.8
Wt.nom
1
2
2
3.5
5
5.6
7.0
8.0
8.0
8.0
CONSTRUCTION
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
Solderability
Copper clad steel wire, nickel plated and solder-coated.
The terminations meet the requirements of IEC 68.2.21.
The terminations meet the requirements of IEC 115-1,–
Clause 4.17.3.2.
W23’s and W24’s are not supplied on tape.
Minimum lead length is 30 mm.
Length
MARKING
The resistors are legend marked with type reference, resistance value and tolerance.
Values are marked in accordance with IEC 62.
SOLVENT RESISTANCE
The body protection and marking are resistant to all normal industrial cleaning
solvents suitable for printed circuits.
Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk
Issue A 07/99
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.
Vitreous Enamelled
Wirewound Resistors
W20 SERIES
●
All welded construction
●
High purity ceramic substrate
●
Impervious lead free vitreous enamel coating
●
High power dissipation for size
●
High stability and reliability
●
Suitable for harsh environments
●
Overload characteristics ideal
for protection circuits
L
D
f
d dia
0 5 10 15 20
Dissipation – Watts
W21
W215
W22
W23
W24
400
300
200
100
0
T
°
C
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