LOW-COST GENERAL PURPOSE
CONFORMAL COATED WIREWOUND
RESISTOR
ISO-9001
Registered
SPP
SERIES
•
•
•
•
•
Color band standard identification
Coated or uncoated units
Positive high TC's upon request
Weldable and solderable magnetic leads
Lower ranges available - contact factory
Alloy resistance
wirewound on
fiberglass core
Mechanically crimped
termination assembly.
EIA/MIL color code:
first wide band indicates
wirewound construction,
blue indicator indicates
flameproof.
SPECIFICATIONS:
IRC Type
Standard Resistance (ohms)
Standard Tolerance (±%)
Power Rating (watts)
SPP-1
0.1 - 1200*
5, 10
1W @ 85°C
3/4W @ 105°C
1/2W @ 125°C
Derating to 0 @ 160°C
1W @ 85°C ±10%
√PR
10,000 megohm
100 megohm
600 volts RMS
Negligible
Approx. 150°C
±600/°C
0.10Ω-0.91Ω
NOTE:
Unless specified otherwise standard test centers are 1 3/4 inches.
SPP-2
0.1 - 2400
5, 10
2W @ 85°C
1W @ 140°C
---
---
2W @ 85°C ±10%
√PR
10,000 megohm
100 megohm
600 volts RMS
Negligible
Approx. 200°C
±600/°C
0.10Ω-0.91Ω
±300/°C
1Ω-2400Ω
SPP-3
0.1 - 2400
5, 10
3W @ 85°C
2W @ 145°C
1W @ 190°C
---
3W @ 85°C ±10%
√PR
10,000 megohm
100 megohm
600 volts RMS
Negligible
Approx. 225°C
±600/°C
0.10Ω-0.91Ω
±300/°C
1Ω-2400Ω
Load Life Stability
Max. Continuous Working Voltage
Min. Insulation Resistance - Dry
Min. Insulation Resistance - Wet
Min. Dielectric Withstanding Voltage
Current Noise
Temperature Rise at Rated Load,
25°C Ambient
Temperature Coefficient
±300/°C
1Ω-1200Ω
DIMENSIONS
(Inches):
IRC Type
SPP-1
SPP-2
SPP-3
A
0.400 max.
0.570 max.
0.570 max.
B
0.148 max
0.170 max
0.170 max
C±.002
0.032
0.032
0.032
1.125
min.
C
B
A
max.
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.
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
1
ISO-9001
Registered
SPP CHARACTERISTICS:
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
±300/°C
±600/°C
±600/°C
0.10Ω−0.91Ω
1.0Ω-2400Ω
0.10Ω−0.91Ω
1.0Ω-2400Ω
±5%
±5%
±5%
±5%
±3%
95% minimum coverage
±5%
±5%
EIA Specification RS-344
POWER DERATING:
Percent Rated Power
100
80
60
SPP-1, 2
40
20
0
0
TEMPERATURE RISE:
Temperature Rise (°C)
300
SPP-3
SPP-3
200
SPP-2
100
SPP-1
50
100
150
200
250
300
0
Ambient Temperature (°C)
0
20 40 60 80 100
20
40
60
80
100
Percent Rated Power
HOW TO ORDER:
Sample Part No.:
SPP
IRC Type
Power
(See specification chart for other power ratings)
Resistance Value
Expressed in ohms
(Standard EIA/MIL values)
Tolerance
±5%, ±10% standard
1
1K
5%
2
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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