SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Features:
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Stackpole Electronics, Inc.
Resistive Product Solutions
High current capability
RoHS compliant / lead-free
Non-inductive style only available with silicone coating
(NSWT)
Suitable for soldering or thru bolt connections
Wirewound ribbon on ceramic substrate
SWT – Silicone coating provides temperature handling up
to 350ºC
SWTA – Adjustable version
EWT – Vitreous enamel coating provides temperature
handling up to 500ºC
Electrical Specifications
Type / Code
SWT12 / EWT12
SWT25 / EWT25
SWT50 / EWT50
SWT100 / EWT100
SWT150 / EWT150
SWT175 / EWT175
SWT200 / EWT200
SWT225 / EWT225
SWT250 / EWT250
SWT300 / EWT300
SWT400 / EWT400
SWT500 / EWT500
SWT700 / EWT700
SWT1000 / EWT1000
SWT1300 / EWT1300
Power Rating
(Watts) @ 70ºC
12W
25W
50W
100W
150W
175W
200W
225W
250W
300W
400W
500W
700W
1000W
1300W
Dielectric
Strength
VAC
1,000
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
2,500
SWT
0.1 - 51K
1 - 30K
0.1 - 50K
0.1 - 100K
0.1 - 150K
0.15 - 100K
0.1 - 200K
0.2 - 130K
0.5 - 250K
0.5 - 300K
0.5 - 400K
0.5 - 500K
1 - 600K
1 - 1M
1 - 1.3M
Ohmic Range (Ω) and Tolerance
5% and 10%
NSWT
0.1 - 53
0.1 - 100
0.1 - 275
0.12 - 680
0.22 - 1.5K
0.24 - 1.3K
0.25 - 1.35K
0.3 - 1.7K
0.33 - 1.8K
0.42 - 2.25K
0.54 - 3K
0.77 - 4.2K
1 - 5.3K
1.4 - 7.6K
2 - 10K
EWT
0.1 - 5K
0.1 - 10K
0.1 - 20K
0.1 - 50K
0.1 - 80K
0.1 - 100K
0.1 - 120K
0.12 - 130K
0.5 - 200K
0.5 - 240K
0.5 - 300K
0.5 - 400K
1 - 500K
1 - 750K
1 - 1M
Rev Date: 03/25/2011
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
1
www.seielect.com
marketing@seielect.com
SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
Mechanical Specifications
Type / Code(1)
SWT12 / EWT12
SWT25 / EWT25
SWT50 / EWT50
SWT100 / EWT100
SWT150 / EWT150
SWT175 / EWT175
SWT200 / EWT200
SWT225 / EWT225
SWT250 / EWT250
SWT300 / EWT300
SWT400 / EWT400
SWT500 / EWT500
SWT700 / EWT700
SWT1000 / EWT1000
SWT1300 / EWT1300
OD
0.31 ± 0.04
7.94 ± 1.0
0.56 ± 0.04
14.3 ± 1.0
0.56 ± 0.04
14.3 ± 1.0
0.75 ± 0.04
19.1 ± 1.0
1.1 ± 0.04
28.0 ± 1.0
1.13 ± 0.04
28.6 ± 1.0
1.38 ± 0.04
35.0 ± 1.0
1.125 ± 0.04
28.6 ± 1.0
1.57 ± 0.04
40 ± 1.0
1.57 ± 0.04
40 ± 1.0
1.57 ± 0.04
40.0 ± 1.0
2.5 ± 0.04
63.5 ± 1.0
1.97 ± 0.04
50.0 ± 1.0
2.50 ± 0.04
63.5 ± 1.0
2.56 ± 0.04
65.0 ± 1.0
ID
0.188 ± 0.04
4.76 ± 1.0
0.31 ± 0.04
7.94 ± 1.0
0.31 ± 0.04
7.94 ± 1.0
0.5 ± 0.04
12.7 ± 1.0
0.75 ± 0.04
19.1 ± 1.0
0.75 ± 0.04
19.1 ± 1.0
0.75 ± 0.04
19.1 ± 1.0
0.75 ± 0.04
19.1 ± 1.0
1.125 ± 0.04
28.6 ± 1.0
1.125 ± 0.04
28.6 ± 1.0
1.125 ± 0.04
28.6 ± 1.0
1.75 ± 0.04
44.5 ± 1.0
1.41 ± 0.04
35.7 ± 1.0
1.75 ± 0.04
44.5 ± 1.0
1.75 ± 0.04
44.5 ± 1.0
F
0.47 ± 0.04
12.0 ± 1.0
0.47 ± 0.04
12.0 ± 1.0
0.75 ± 0.04
19.0 ± 1.0
0.67 ± 0.04
17.0 ± 1.0
0.67 ± 0.04
17.0 ± 1.0
0.67 ± 0.04
17.0 ± 1.0
0.67 ± 0.04
17.0 ± 1.0
0.71 ± 0.04
18.0 ± 1.0
0.71 ± 0.04
18.0 ± 1.0
0.71 ± 0.04
18.0 ± 1.0
0.71 ± 0.04
18.0 ± 1.0
1.1 ± 0.04
28.0 ± 1.0
1.1 ± 0.04
28.0 ± 1.0
1.18 ± 0.04
30.0 ± 1.0
1.18 ± 0.04
30.0 ± 1.0
L
1.75 ± 0.08
44.5 ± 2.0
2.00 ± 0.08
51.0 ± 2.0
4.00 ± 0.08
102.0 ± 2.0
6.5 ± 0.08
165.0 ± 2.0
7.11 ± 0.08
206.0 ± 2.0
8.5 ± 0.08
216.0 ± 2.0
8.74 ± 0.08
222.0 ± 2.0
10.5 ± 0.08
267.0 ± 2.0
8.74 ± 0.08
222.0 ± 2.0
10.71 ± 0.08
272.0 ± 2.0
13.46 ± 0.08
342.0 ± 2.0
12 ± 0.08
305.0 ± 2.0
18.18 ± 0.08
462.0 ± 2.0
20 ± 0.08
508.0 ± 2.0
26.26 ± 0.08
667.0 ± 2.0
Unit
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
(1) EWT and NSWT series will have the same Mechanical Specifications as SWT series
Power Derating Curve:
Percent Rated Power (%)
100
80
60
40
20
25
30
100
150
200
250
300
350
Ambient Temperature (ºC)
Rev Date: 03/25/2011
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
2
www.seielect.com
marketing@seielect.com
SWT/EWT Series
Non-Flammable Edgewound Tubular Wirewound Resistor
Stackpole Electronics, Inc.
Resistive Product Solutions
How to Order
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12
E
W
T
Code
-
M
S
L
A
M
5
Code
12
25
50
100
150
175
200
225
250
300
400
500
700
1000
1300
0
Power
12W
25W
50W
100W
150W
175W
200W
225W
250W
300W
400W
500W
700W
1000W
1300W
J
Tolerance
Code
Tol
J
5%
K
10%
B
2
0
0
R
Resistance Value
Product Series
Silicone Coating (std)
Vitreous Enamel
Non-inductive Silicone
NSWT
Coating
SW T
EW T
Description
Std Tab Connection
Mounting Hardware
Spring Clips
Welded Straight Leads
Adjustable
Code
B
Packaging
Description
Size
Quantity
Bulk
All Sizes
Each
Four characters with the
multiplier used as the
decimal holder.
0.1 ohm = R100
1 ohm = 1R00
10 Kohm = 10K0
Legacy Part Number (before January 3, 2011):
SEI Type
Termination
Power
Rating
Nominal
Resistance
Tolerance
Packaging
EWT
Type
Description
SWT
Silicone Coating (std)
EWT
Vitreous Enamel
NSWT Non-Inductive Silicone Coating
M
Code
Description
-
Std Tab Connection
M
Mounting Hardware
S
Spring Clips
L
Welded Straight Leads
A
Adjustable
50
Code
12
25
50
100
150
175
200
225
250
300
400
500
700
1000
1300
200
5%
Tolerance
5%
10%
B
Code Description
B
bulk
Rev Date: 03/25/2011
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
3
www.seielect.com
marketing@seielect.com
