Resistors
General-Purpose Failsafe
General-Purpose Failsafe
Moulded Wirewound Resistors
Moulded Wirewound Resistors
SP20 / SP20F Series
SP20/SP20F Series
SP20F UL1412 recognised fusing
•
Drop-in replacement for
*
BW20/BW20F
0.1 ohm to 1200 ohms
•
Predictable fusing characteristics
F version has flame resistant coating
•
1 watt rated with 1/2 watt dimensions
1 watt rated with 1/2 watt dimensions
Drop-in replacement BW20 / BW20F
•
0.1 ohm to 1200 ohms
Weldable and solderable magnetic lead
•
Weldable and solderable magnetic leads
* UL file number E234469
Welwyn Components
TCR’s as low as ±150 ppm/°C standard (custom TC’s available)
Lead free, RoHS compliant construction available
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Type
EIA RS-344 Style
MIL-R-11 Style
Resistance Range
UL Recognised Range
Tolerance
Power rating
ohms
ohms
%
watts
1 at 50°C
0.75 at 70°C
0.5 at 100°C
Derating to 0 at 160°C
Maximum continuous working voltage
Minimum insulation resistance
Minimum dielectric withstanding volts
Reduced pressure
Hotspot temperature rise
Current noise
dry
wet
ATM
RMS
√PR
10,000 Meg
100 Meg
700V
450V
120°C at 1 watt
Negligible
0R1 to 1k2
N/A
±5, ±10
1 at 50°C
0.75 at 70°C
-
Derating to 0 at 160°C
SP20
CRU 1
RC20/RC32
0R1 to 1k
1R0 to 470R
SP20F
Physical Data
Dimensions (mm)
Type
SP20
SP20F
L
9.91±0.25
9.91±0.25
D
3.56±0.20
3.56±0.20
d
0.813±0.05
0.813±0.05
f
38.1±3.2
38.1±3.2
d
D
L
f
All resistor types have resistance alloy winding on a braided
fibreglass substrate. Intermediate silicone coatings are used to
enhance processibility and to provide protection to the
resistive element.
Resistive Element
Termination
The SP20 and SP20F are encapsulated utilizing a compression
molded phenolic plastic material. The SP20F has a flame
resistance coating applied over the resistive element to
provide flammmability protection when destructive overloads
may occur.
All products are marked utilizing heat and solvent resistant
colour code bands consistent with EIA/MIL requirements. The
first band is double width to designate wirewound
construction. A fifth band, blue in colour, is used for
flameproof identification.
Encapsulation
The SP20 and SP20F resistors are terminated using an alloy
coated copper flashed steel lead welded to a cap of the same
material. This termination assembly is mechanically crimped,
utilizing an improved crimp design, to the resistive element.
Marking
General Note
General Note
Welwyn Components reserves the right to make changes in product specification
or liability.
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
A subsidiary of
TT electronics plc
http://www.ttelectronics.com/resistors
Issue B · 03.02
07.14
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
95
General-Purpose Failsafe
General-Purpose Failsafe
General-Purpose
General-Purpose Failsafe
Moulded Wirewound Resistors
Moulded Wirewound Resistors
Moulded
Moulded Wirewound Resistors
SP20/SP20F Series
SP20/SP20F Series
SP20/SP20F Series
SP20/SP20F Series
Make Possible
Welwyn Components
Performance Data
Performance
Test
Test
Temper
rature
coef
ff
i
i
ci
i
ent
t
(
(
ppm)
)
Tempe
ature
coe
f
c en ppm
Di
ielectric
wi
iths
t
t
andi
i
ng vol
l
t
t
age
D
electric
w
ths
and ng vo age
Moment
tary
over
r
l
l
oad
Momen
ary
ove oad
ppm/
/
°C
ppm °C
RMS
RMS
%
%
%
%
%
%
%
%
%
%
%
%
%
%
SP20
SP20
<1R ±800
<1R ±800
≥1R
±150
≥1R
±150
700V
700V
5
5
5
5
5
5
5
5
5
5
5
5
5
5
SP20F
<1R ±800*
<1
≥1R
±150
≥1R
±150
SP20 / SP20F Series
Humi
idity
Hum
dity
Load l
life
Load
ife
Low t
temperatu
r
re
oper
r
at
t
i
i
on
Low
emperatu e
ope a on
Temper
rature
cycl
l
e
Tempe
ature
cyc e
General
h
h
Purpose Failsafe
Ter
rminal
s
streng
t
t
Te
minal treng
Molded
o
o
l
l
d
Wirewound Resistor
Res
sistance
t
to
s
s d
er
r
heat
t
Re
istance o
e hea
*0.1 ohm SP20F <1000 ppm.
*0.1 ohm SP20F <1000 ppm.
SP20 Power Derating
SP20 Power Derating
2.5
Power (watts)
Power (watts)
SP-20 Power Derating Curve
2.0
SP-20F Power Derating Curve
2.5
2.5
SP20F Power Derating
SP20F Power Derating
2.0
2.0
1.5
1.5
1.0
1.0
0.5
0.5
0
0
0
0
2.5
2.0
Power (watts)
Power (watts)
Power (watts)
Power (watts)
1.5
1.0
0.5
0
0
Ambient Temperature (°C)
50
100
150
200
Ambient Temperature (°C)
1.5
1.0
0.5
0
0
50
100
50
100
150
50
100
150
Ambient Temperature (°C)
150
200
Ambient Temperature (°C)
200
200
Ambient Temperature (°C)
Ambient Temperature (°C)
SP20F Typical Fusing
SP20F Typical Fusing
SP20 and SP20F Temperature Rise
SP20 and SP20F Temperature Rise
SP20F Fusing Characteristic
(Maximum & Typical Fusing Times)
Temp (°C)
Temp (°C)
1000
Temperature Rise (°C)
Power (watts)
Power (watts)
SP-20 and SP20F
Temperature Rise Chart
120
100
80
60
40
Time (seconds)
Time (seconds)
0.1 ohm
1 ohm
0.1 ohm
10 ohm
1 ohm
100 ohm
10 ohm
1000 ohm
100 ohm
1000 ohm
Maximum - all values
Fusing Time (s)
100
Typical
- 1R0
10
Typical
- 470R
20
Ordering Procedure
Ordering Procedure
0
Example: SP20F at 470 ohms and 5% tolerance tape packed on a reel of 4000 pieces
–
1
Power Input (watts)
Power Input (watts)
96
I
4000/reel
Standard
All information is
Tape
to TT Electronics’ own data and is considered accurate at time of going to print.
subject
TT Electronics reserves the right to make changes in product specification without notice or liability.
Recognition
Components Limited
Bedlington, Northumberland NE22 7AA, UK
© Welwyn
is subject to TT Electronics’ own data and is considered accurate at time of going to print.
All information
UL =
Electronics plc
© TT
UL1412 recognised (optional characters)
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: 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
Resistance Range
(First three significant figures plus fourth digit multiplier)
Value (use IEC62 code)
Tolerance (use IEC62 code)
J
5%
K
10%
Tolerance (use IEC62 code)
J
5%
10%
Sample Part No.
K
SP20F 1800 J LF XXX
Packing
General Note
I
Standard
Packing
Tape 4000/reel
TT Electronics reserves the right to make changes in product specification without notice or liability.
Example: SP20F at 470 ohms and 5% tolerance tape packed on a reel of
J
I
pieces
–
0.1
SP20F
–
470R
4000
Power Input (watts)
10
15
20
25
30
35
40
SP20F
–
470R J
I
Type
Initial Power (W)
Type
(use IEC62 code)
Value
0
0.5
1.0
1.5
2.0
45
50
55
60
Ordering Data
General
IRC Type
Note
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
www.ttelectronicsresistors.com
Issue B · 03.02
07.14
Issue B · 03.02
General-Purpose Failsafe
Moulded Wirewound Resistors
SP20/SP20F Series
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Number: SP20FUL-180RJI
(SP20F with UL recognition, 180 ohms ±5%, Pb-free)
S
P
2
1
1
Type
2
UL Status
0
F
U
2
L
-
1
8
3
3
Value
0
R
J
4
4
J = ±5%
K = ±10%
I
5
5
I = Standard packing & Pb-free
Tape pack 4000/reel
Tolerance Packing & Termination Finish
SP20
R = ohms
UL = UL recognised
SP20F (SP20F only, see Electrical K = kilohms
Data for applicable values.)
USA (IRC) Part Number: SP20FUL1800JLF
(SP20F with UL recognition, 180 ohms ±5%, Pb-free)
S
P
2
1
1
2
0
F
U
2
L
1
8
3
3
0
0
J
4
L
5
4
F
6
5
6
Packing &
Type
UL Status
Value
Tolerance
Custom Code
Termination Finish
SP20
3 digits + multiplier J = ±5%
Omit for SnPb
Optional
UL = UL recognised
SP20F (SP20F only, see Electrical
K = ±10%
LF = Pb-free
R = ohms for
Data for applicable values.) values <100 ohms
Tape pack 4000/reel
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.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
07.14
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