WELWYN SPP

General Purpose
Wirewound Resistors
Welwyn Components
SPP Series
•
•
•
•
0R1 to 2K4 ohms
Positive high TC’s upon request
Weldable and solderable magnetic leads
Lower ranges available - contact factory
Electrical Data
Type
Resistance range
ohms
Standard Tolerance
±%
Power Rating
watts
Load Life Stability
watts
SPP-1
SPP-2
SPP-3
0R1 - 1K2*
0R1 - 2K4
0R1 - 2K4
5, 10
5, 10
5, 10
1 @ 85°C
2 @ 85°C
3 @ 85°C
0.75 @ 105°C
1 @ 140°C
2 @ 145°C
1 @ 190°C
0.5 @ 125°C
-
Derating to 0 @ 160°C
-
-
1 @ 85°C ± 10%
2 @ 85°C ± 10%
3 @ 85°C ± 10%
√PR
Max. Continuous Working Voltage
Min. Insulation Resistance - Dry
10,000 megohm
Min. Insulation Resistance - Wet
100 megohm
Min. Dielectric Withstanding Voltage
600 volts RMS
Current Noise
Negligible
Temperature Rise at Rated Load, 25°C Ambient
Approx. 150°C
Approx. 200°C
Approx. 225°C
Note: Unless specified otherwise standard test centres are 13/4 inches.
Physical Data
Dimensions (inches)
A
max.
Type
A max
B max
C±0.002
SPP-1
0.400
0.148
0.032
SPP-2
0.570
0.170
0.032
SPP-3
0.570
0.170
B
C
1.125 min
0.032
Fuse/Pulse Applications
SPP resistors normally fuse in less than one minute with five
to ten times rated wattage depending on the range. By
modifying the windings, using a different wire size or type,
they can be made to fuse much faster.
On the other hand, by using larger wire diameters and higher
melt temperature alloys they can handle from five to fifty
times overloads of film resistors depending on the range.
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: [email protected] · Website: www.welwyn-tt.com
Issue B · 03.02
97
General Purpose
Wirewound Resistors
Welwyn Components
SPP Series
Performance Data
Maximum Limits
Temperature Coefficient
±600/°C 0.10Ω-0.91Ω
SPP-1
±300/°C 1.0Ω-1200Ω
±600/°C 0.10Ω-0.91Ω
SPP-2
±300/°C 1.0Ω-2400Ω
±600/°C 0.10Ω-0.91Ω
SPP-3
±600/°C 1.0Ω-2400Ω
Thermal Shock
±5%
Low Shock
±5%
Short Time Overload
±5%
Commercial Short Time Overload
±5%
Resistance to Solder Immersion
±3%
Solderability
95% minimum coverage
Moisture Resistance
±5%
Life Test
±5%
Test Method
EIA Specification RS-344
Power Derating:
Temperature Rise:
Temperature Rise (°C)
Percent Rated Power
100
SPP-3
80
60
SPP-1, 2
40
20
0
0
50
100
150
200
250
300
Ambient Temperature (°C)
SPP-3
300
SPP-2
200
100
SPP-1
0
0
20
40
60
80
100
Percent Rated Power
Packaging
Resistors are supplied taped and reeled. 4,000 pcs per reel.
Bulk pack available.
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
98
Issue B · 03.02