LEADED RESISTORS
DIMENSIONS Unit: mm
STYLE DIMENSION
Normal Miniature L øD H ød
KNP-25 NP50S 6.3±0.5 2.4±0.2 28±2.0 0.55±0.05
KNP-50 KNP1WS 9.0±0.5 3.3±0.3 26±2.0 0.55±0.05
KNP100 KNP2WS 11.5±1.0 4.5±0.5 35±2.0 0.8±0.05
KNP200 KNP3WS 15.5±1.0 5.0±0.5 33±2.0 0.8±0.05
KNP300 KNP5WS 17.5±1.0 6.5±0.5 32±2.0 0.8±0.05
KNP400
KNP500 KNP7WS 24.5±1.0 8.0±0.5 38±2.0 0.8±0.05
KNP700 - 24.5±1.0 8.0±0.5 38±2.0 0.8±0.05
Note: KNP1WS ( for MB Type ) ød = 0.8±0.05 mm
FEATURES
Power Rating 1/4W, 1/2W, 1W, 2W, 3W, 4W, 5W, 7W
Resistance Tolerance ±1%, ±5%
T.C.R. ±300ppm/°C
Flameproof Multi-layer Coating Meets UL-94V-0
Flameproof Feature Meets Overload Test UL-1412
DERATING CURVE
For resistors operated in ambient temperatures above 40°C, power rating must be derated
in accordance with the curve below.
ød
H L øD
INTRODUCTION
The resistor element is a resistive wire which is
wound in a single layer on a ceramic rod, with
tinned connecting wires of electrolytic copper
welded to the end-caps. The ends of the
resistive wire and the leads are connected to
the caps by welding. The resistors are coated
with layers of green color flame-proof lacquer.
Wirewound Resistors
Flame-Proof Type
Normal & Miniature Style [ KNP Series ]
Rated Load (%)
Ambient Temperature (°C)
30025020015010050
100
80
60
40
20
70
3W-7W
1/4W-3WS
200 27540 °C
55
Note: Rated Continuous Working Voltage (RCWV) = Power Rating x Resistance Value
ELECTRICAL CHARACTERISTICS
NORMAL STYLE
STYLE KNP-25 KNP-50 KNP100 KNP200 KNP300 KNP400 KNP500 KNP700
Power Rating at 40°C 3W 4W 5W 7W
Power Rating at 70°C 1/4W 1/2W 1W 2W
Voltage Proof 250V 300V 400V
Resistance Range (±1%) 0.22 Ω - 150 Ω0.1 Ω - 800 Ω0.1 Ω - 1.8K Ω0.1 Ω - 2.8K Ω0.1 Ω - 7.5K Ω 0.1 Ω - 6.5K Ω
Resistance Range (±5%) 0.05 Ω - 200 Ω0.03 Ω - 800 Ω0.015 Ω - 2.2K Ω0.015 Ω - 2.8K Ω0.02 Ω - 7.5K Ω0.03 Ω - 6.8K Ω
Operating Temp. Range -40°C to +200°C
Temperature Coefcient ±300ppm/°C
Note: Special value is available on request
MINIATURE STYLE
STYLE KNP50S KNP1WS KNP2WS KNP3WS KNP5WS KNP7WS
Power Rating at 40°C 5W 7W
Power Rating at 70°C 1/2W 1W 2W 3W
Voltage Proof 200V 300V 400V
Resistance Range (±1%) 0.22 Ω - 150 Ω0.1 Ω - 800 Ω0.1 Ω - 1.8K Ω0.1 Ω - 2.8K Ω0.1 Ω - 7.5K Ω0.1 Ω - 6.5K Ω
Resistance Range (±5%) 0.05 Ω - 200 Ω0.03 Ω - 800 Ω0.015 Ω - 2.2K Ω0.015 Ω - 2.8K Ω0.02 Ω - 7.5K Ω0.03 Ω - 6.8K Ω
Operating Temp. Range -40°C to +200°C
Temperature Coefcient ±300ppm/°C
Note: Special value is available on request
ENVIRONMENTAL CHARACTERISTICS
PERFORMANCE TEST TEST METHOD APPRAISE
Short Time Overload IEC 60115-1 4.13 10 times rated power for 5 Sec. ±2.0%+0.05 Ω
Voltage Proof IEC 60115-1 4.7 in V-block for 60 Sec., test voltage by type By type
Temperature Coefcient IEC 60115-1 4.8 -55°C to +155°C By type
Insulation Resistance IEC 60115-1 4.6 in V-block for 60 Sec. >100M Ω
Solderability IEC 60115-1 4.17 235±5°C for 3±0.5 Sec 95% Min. coverage
Solvent Resistance of Marking IEC 60115-1 4.30 IPA for 5±0.5 Min. with ultrasonic No deterioration of
coatings and markings
Robustness of Terminations IEC 60115-1 4.16 Direct load for 10 Sec. in the direction of the terminal leads ≥2.5kg (24.5N)
Damp Heat Steady State IEC 60115-1 4.24 40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV ±5.0%+0.05 Ω
Endurance at 70°C IEC 60115-1 4.25 70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off) ±5.0%+0.05 Ω
Temperature Cycling IEC 60115-1 4.19 -55°C Room Temp. +155°C Room Temp. (5 cycles) ±1.0%+0.05 Ω
Resistance to Soldering Heat IEC 60115-1 4.18 260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the body ±1.0%+0.05 Ω
Accidental Overload Test IEC 60115-1 4.26 4 times RCWV for 1 Min. No evidence of aming
or arcing
