TT electronics SPP Technical data
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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 SPP-1 SPP-2 SPP-3
Resistance range ohms 0R1 - 1K2* 0R1 - 2K4 0R1 - 2K4
Standard Tolerance ±% 5, 10 5, 10 5, 10
1 @ 85°C 2 @ 85°C 3 @ 85°C
Power Rating watts
Load Life Stability watts 1 @ 85°C ± 10% 2 @ 85°C ± 10% 3 @ 85°C ± 10%
Max. Continuous Working Voltage √PR
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
0.75 @ 105°C 1 @ 140°C 2 @ 145°C
0.5 @ 125°C - 1 @ 190°C
Derating to 0 @ 160°C - -
Note: Unless specified otherwise standard test centres are 13/4 inches.
Physical Data
Dimensions (inches)
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 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.
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.
© 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
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.
B
1.125 min
max.
A
C
A subsidiary of
TT electronics plc
Issue B · 03.02
97
General Purpose
Wirewound Resistors
SPP Series
Welwyn Components
Performance Data
Maximum Limits
Temperature Coefficient
SPP-1
SPP-2
SPP-3
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
±600/°C 0.10Ω-0.91Ω
±300/°C 1.0Ω-1200Ω
±600/°C 0.10Ω-0.91Ω
±300/°C 1.0Ω-2400Ω
±600/°C 0.10Ω-0.91Ω
±600/°C 1.0Ω-2400Ω
Power Derating: Temperature Rise:
100
80
60
SPP-1, 2
40
20
Percent Rated Power
0
0 50 100 150 200 250 300
Ambient Temperature (°C)
SPP-3
300
200
100
Temperature Rise (°C)
0
0 20 40 60 80 100
Packaging
Resistors are supplied taped and reeled. 4,000 pcs per reel.
Bulk pack available.
SPP-3
SPP-2
SPP-1
Percent Rated Power
© 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
98
Issue B · 03.02
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