PRODUCT BULLETIN
KNP-SERIES
WIREWOUND RESISTORS
FLAME-PROOF
CERAMIC CORE: 75% ALUMINA
LEAD: TIN PLATED COPPER
CAP: TIN PLATED STEEL CAP
COATING: SILICON
WIRE: Cu-Ni OR Ni-Cr WIRE
WILLOW TECHNOLOGIES LTD.
SHAWLANDS COURT, NEWCHAPEL ROAD
LINGFIELD, SURREY, RH7 6BL, ENGLAND
Tel. + 44 (0) 1342 835234 Fax. + 44 (0) 1342 834306
E-mail
rob@willow.co.uk
Website
http://www.willow.co.uk
TYPE
RATED
WATTS
1/2W
1W
2W
3W
5W
7W
8W
10W
Resistance range
0.1 - 240R
0.1 - 470R
0.1 - 820R
0.1 - 820R
0.1 - 1.3K
0.1 - 3.3K
0.1 - 2K
0.1 - 4.7K
H
L
D
d
KNP-1/2W
KNP-1W
KNP-2W
KNP-3W
KNP-5W
KNP-7W
KNP-8W
KNP-10W
Dimensional
Correlation
in.
.002
.020
.024
.031
.059
.138
.157
.217
.256
.335
.354
.433
.590
.709
.984
1.063
1.575
1.693
Note: Resistance up to 27 maximum for Non-Inductive type
Lower or higher resistance values other than the list are also available
TYPE
DIMENSIONS (mm)
L ±1.5mm
H(MIN)
9
25
11
27
15
27
15
27
18
27
25
27
40
27
53
27
mm
0.05
0.5
0.6
0.8
1.5
3.5
4.0
5.5
6.5
8.5
9.0
11.0
15.0
18.0
25.0
27.0
40.0
43.0
KNP-1/2W
KNP-1W
KNP-2W
KNP-3W
KNP-5W
KNP-7W
KNP-8W
KNP-10W
D ±0.5mm
3.5
4.0
5.5
5.5
6.5
8.5
8.5
8.5
d ±0.05
0.60
0.8
0.8
0.8
0.8
0.8
0.8
0.8
TEMPERATURE COEFFICIENT
-30°C to 200°C ± 300PPM/°C
Resistance Tolerance ± 5
How to Order
Sample Part Number
KNP 1W T300 1RO ± 5%
Resistance Tolerance
Resistance Value
Temperature Coefficient
Wattage
Type
DEDICATION TO EXCELLENCE
Subject to change without notice
Rev O
4/4/01
TEMPERATURE RISE AT 25°C
-30°C
DERATING CURVE
70°C
100
250
200
150
100
50
Ambient Temp (°C)
0
0
20 40
10W
7W
5W
3W
2W
1W
1/2W
60
80
100 120
80
60
40
Rated Load (%)
20
0
-20 0
40
80
120
160
200
240
280
275°C
Rated Load (%)
Temperature Rise (°C)
Characteristics
Resistance Temp. Coeff.
Short Time Over Load
Rate Load
Voltage Durability
Insulation Resistance
Temp Cycle
Load Life
Moisture-proof Load Life
Incombustibility
Condition
-30°C ~ +200°C
5 times of rated wattage for 5 sec.
Rate watt 30 min.
500V AC 1 min.
500V megger
-30°C ~ 85°C 5 cycles
40°C 95% RH on-off cycle 500 hrs.
40°C 95% RH on-off cycle 500 hrs.
6 times of rated wattage for 5 min.
Spec.
± 300 ppm/°C
± 2%
± 1%
not changed
500 M
± 1%
± 5%
± 3%
not flamed
PACKAGING:
PIECES PER REEL:
BULK:
TAPE AND REEL
KNP 1/2W AND 1W
KNP 2W, 3W AND 5W
KNP 7W
KNP 8W AND 10W
2500
1000
500
100
Subject to change without notice
REV O
4/4/01
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