General Purpose
General Purpose
General Purpose
Wirewound Resistors
Wirewound Resistors
Wirewound Resistors
SPP Series
SPP Series
SPP Series
0R1 to 2K4 ohms
•
0R1 to 2K4 ohms
•
0R1 to 2K4 ohms
upon request
Positive high TC’s
•
Positive high TC’s
upon request
•
Positive high TC’s upon request
leads
Weldable and solderable magnetic
•
Weldable and solderable magnetic
leads
Weldable and
available - contact factory
•
Lower ranges
solderable magnetic leads
Lower ranges available - contact factory
•
Lower ranges available - contact factory
•
Welwyn Components
Welwyn Components
·
·
·
·
Electrical Data
Electrical Data
Type
Type
Resistance range
Resistance range
Standard Tolerance
Standard Tolerance
ohms
ohms
±%
±%
SPP-1
SPP-1
0R1 -
0R1 - 1K2*
1K2*
5, 10
5, 10
1 @ 85°C
85°C
1@
0.75 @ 105°C
SPP-2
SPP-2
0R1 - 2K4
- 2K4
0R1
5, 10
5, 10
2 @ 85°C
@ 85°C
2
1 @ 140°C
-
-
√PR
SPP-3
SPP-3
0R1 - 2K4
0R1 - 2K4
5, 10
5, 10
3 @ 85°C
@ 85°C
3
2 @ 145°C
1 @ 190°C
-
Power Rating
Power Rating
watts
0.75 @ 105°C
watts
0.5 @ 125°C
0.5 @ 125°C
Derating to 0 @ 160°C
1 @ 85°C ± 10%
1 @ 140°C
-
-
2 @ 145°C
1 @ 190°C
-
Load Life Stability
Max. Continuous Working Voltage
Min. Insulation Resistance - Dry
Min. Insulation Resistance - Wet
Load Life Stability
watts
Derating to 0 @ 160°C
1 @ 85°C ± 10%
watts
2 @ 85°C ± 10%
10,000 megohm
100 megohm
2 @ 85°C ± 10%
√PR
10,000 megohm
3 @ 85°C ± 10%
3 @ 85°C ± 10%
Max. Continuous Working Voltage
Min. Insulation Resistance - Dry
Min. Insulation Resistance Wet
Min. Dielectric Withstanding
-
Voltage
Min. Dielectric
Current Noise
Withstanding Voltage
Current Noise
Temperature Rise at Rated Load, 25°C Ambient
Temperature Rise at Rated Load, 25°C Ambient
Note: Unless specified otherwise standard test centres are 1
3
/
4
inches.
Approx. 150°C
100 megohm
600 volts RMS
600
Negligible
volts RMS
Negligible
Approx. 200°C
Approx. 200°C
Approx. 225°C
Approx. 150°C
Approx. 225°C
Physical Data
Type
SPP-1
SPP-2
SPP-3
Note: Unless specified otherwise standard test centres are 1
3
/
4
inches.
Physical Data
Dimensions (inches)
Dimensions (inches)
Type
SPP-1
SPP-2
A max
0.400
0.570
0.570
B max
0.148
0.170
0.170
C±0.002
0.032
0.032
0.032
A
max.
A max
0.400
0.570
B max
0.148
0.170
C±0.002
0.032
0.032
B
A
max.
C
1.125 min
B
C
1.125 min
Fuse/Pulse Applications
SPP-3
0.570
0.170
0.032
SPP resistors normally fuse in less than one minute with five
On the other hand, by using larger wire diameters and higher
to ten times rated wattage depending on the range. By
melt temperature alloys they can handle from five to fifty
Fuse/Pulse Applications
modifying the
normally fuse in
a
less than one minute
type,
five
times overloads of film resistors depending
wire diameters and higher
SPP resistors
windings, using different wire size or
with
On the other hand, by using larger
on the range.
they can be made to fuse much faster.
on the range. By
to ten times rated wattage depending
melt temperature alloys they can handle from five to fifty
modifying the windings, using a different wire size or type,
they can be made to fuse much faster.
times overloads of film resistors depending on the range.
General Note
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
TT electronics reserves the
to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
All information is subject
right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
General Note
Issue B · 03.02
Telephone: +44 (0) 1670
Welwyn Components reserves
· Facsimile:
make
1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
822181
the right to
+44 (0)
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
11. 11
97
TT electronics plc
General Purpose
General Purpose
Wirewound Resistors
Wirewound Resistors
SPP Series
SPP Series
Welwyn Components
Performance Data
Maximum Limits
Temperature Coefficient
SPP-1
SPP-2
SPP-3
Thermal Shock
Low Shock
Short Time Overload
Commercial Short Time Overload
Resistance to Solder Immersion
Solderability
Moisture Resistance
Life Test
Test Method
±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
±5%
±5%
±5%
±5%
±3%
95% minimum coverage
±5%
±5%
EIA Specification RS-344
Power Derating:
100
Percent Rated Power
SPP-3
SPP-1, 2
Temperature Rise:
Temperature Rise (°C)
300
200
100
SPP-1
0
0
20
40
60
80
100
SPP-3
SPP-2
80
60
40
20
0
0
50
100
150
200
250
300
Ambient Temperature (°C)
Percent Rated Power
Ordering Procedure
Example: SPP1 at 100 ohms and 5% tolerance tape packed on a reel
–
SPP1
–
100RJ
I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
J
5%
K
10%
Packing
I
Tape
Standard
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
© TT electronics plc
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
11. 11
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