Models 12
S
, 14
S
, 15
S
, 17
S
, 18
S
Vishay Techno
1/4" [6.35 mm] Sq. Wirewound Trimmers
FEATURES
•
•
•
•
•
•
Precious metal wiper
0.25 watt to + 85 °C
TCR < 50 ppm/°C
Solderable leads
Special configurations available
Military quality at affordable prices
APPLICATIONS
Wirewound trimmers are particularly useful in those
applications where any combination of high power, low
temperature coefficient of resistance and/or excellent long
term life stability are important design considerations.
STANDARD RESISTANCE VALUES
RESISTANCE*
(Ohms)
10
20
50
100
200
500
1k
2k
5k
10k
20k
25k
*Other resistances available upon request.
NOMINAL RESOLUTION
(%)
1.65
1.35
1.13
0.82
0.62
0.62
0.49
0.34
0.27
0.21
0.17
0.16
ELECTRICAL SPECIFICATIONS
Electrical Travel:
22 ± 4 turns
Resistance Range:
10 ohms to 5 kilohms, Extended range
available in non MIL-Spec product
Resistance Tolerance:
± 5 % standard,
Closer tolerances available
Temperature Coefficient:
(- 65 °C to + 150 °C) ± 50 ppm/°C
Power Rating:
0.5 watt at + 85 °C derated to 0 watt at + 150 °C,
These specifications exceed MIL-Spec
End Resistance:
1 ohm or 2 %, whichever is greater
Equivalent Noise Resistance (ENR):
100 ohms maximum
Dielectric (DWV):
1000 VAC at atmospheric pressure,
These specifications exceed MIL-Spec
Insulation Resistance:
>100000 Megohms (500 VDC),
These specifications exceed MIL-Spec
MECHANICAL SPECIFICATIONS
Operating Torque:
3 ounce inch maximum, 17
s
and 18
s
,
5 ounce inch maximum, 12
s
, 14
s
and 15
s
Rotation:
Clutch stop, wiper idles
Weight:
0.935 grams maximum
Resistive Element:
Nickel chromium
Rotational Life:
200 cycles minimum
Terminal Strength:
2 pounds for 10 seconds
CIRCUIT DIAGRAM
1
CW
2
3
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits:
- 65 °C to + 175 °C
Sealing:
Fully sealed case (non-hermetic)
DIMENSIONAL CONFIGURATIONS 1/4" [6.35 mm] Square
in inches [millimeters]
W Lead Style - 17
S
0.038 ± 0.005
[0.965 ± 0.127]
0.020 ± 0.003
[0.508 ± 0.076]
0.030 ± 0.010
[0.762 ± 0.254]
X Lead Style - 18
S
0.045 ± 0.005
[1.14 ± 0.127]
0.260 ± 0.005
[6.60 ± 0.127]
0.172 [4.37]
Min.
0.016 ± 0.001
[0.406 ± 0.025]
Dia.
0.020 ± 0.003
[0.508 ± 0.076]
0.062 ± 0.005
[1.57 ± 0.127]
0.020 ± 0.003
[0.508 ± 0.076]
0.160 ± 0.010
[0.406 ± 0.254]
0.045 ± 0.005
[1.14 ± 0.127]
0.100 ± 0.005
[2.54 ± 0.127]
0.211 ± 0.005
[5.36 ± 0.127]
0.100 ± 0.005
[2.54 ± 0.127]
0.211 ± 0.005
[5.36 ± 0.127]
0.020 ± 0.003
[0.508 ± 0.076]
1 2 3
0.260 ± 0.005
[6.60 ± 0.127]
0.172 [4.37]
Min.
0.030 ± 0.010
[0.762 ± 0.254]
0.120 ± 0.005
[3.05 ± 0.127]
0.016 ± 0.001
[0.406 ± 0.025]
Dia.
0.120 ± 0.005
[3.05 ± 0.127]
0.062 ± 0.005
[1.57± 0.127]
Dia.
0.160 ± 0.010
[4.06 ± 0.254]
0.038 ± 0.005
[0.965 ± 0.127]
0.100 ± 0.005
[2.54 ± 0.127]
0.100 ± 0.005
[2.54 ± 0.127]
www.vishay.com
30
For technical questions contact te1resistors@vishay.com
Document Number: 68017
Revision: 27-Jun-05
Models 12
S
, 14
S
, 15
S
, 17
S
, 18
S
1/4" [6.35 mm] Sq. Wirewound
Vishay Techno
DIMENSIONAL CONFIGURATIONS 1/4" [6.35 mm] Square
in inches [millimeters]
P Lead Style - 15
S
0.180 ± 0.015
[4.57 ± 0.381]
0.020 ± 0.0015
[0.508± 0.038]
Dia.
0.020
[0.508]
1.72
[4.37]
Min.
0.082
[2.08]
3
0.055 ± 0.010
[1.40 ± 0.254]
0.050 ± 0.010
[1.27 ± 0.254]
0.125
[3.17]
1
2
0.020
[0.508]
0.014 [0.356]
Min.
0.172
[4.37]
Min.
W Lead Style - 12
S
0.156 ± 0.010
[3.96 ± 0.254]
0.014 [0.356]
Min.
0.120 ± 0.010
[3.05 ± 0.254]
0.062 ± 0.002
[1.57 ± 0.051]
Dia.
0.156
[3.96]
0.100
[2.54]
0.250 ± 0.015
[6.35 ± 0.381]
0.050 ± 0.010
0.062 ± 0.002 [1.27 ± 0.254]
[1.57 ± 0.051]
Dia.
0.250 ± 0.015
[6.35 ± 0.381] 0.013 ± 0.001
[0.330 ± 0.025]
Dia.
1
2
3
0.038
[0.965]
0.100
[2.54]
0.100
[2.54]
X Lead Style - 14
S
0.062 ± 0.002
[1.57 ± 0.051]
Dia.
0.050 ± 0.010
[1.27 ± 0.254]
0.020
[0.508]
0.014 [0.356]
Min.
3
2
1
0.038
[0.965]
0.250 ± 0.015
[6.35 ± 0.381]
0.120 ± 0.010
[3.05 ± 0.254]
0.156 ± 0.010
[3.96 ± 0.254]
0.210
[5.33]
0.013 ± 0.001
[0.330 ± 0.025]
Dia.
0.172 [4.37]
Min.
0.100
[2.54]
ENVIRONMENTAL PERFORMANCE
TEST
1
Thermal Shock
Low Temperature Operation
High Temperature Exposure
Moisture Resistance
Resistance to Soldering Heat
Shock
Vibration
Rotational Life
Load Life
1
2
For
CONDITIONS
(107) 5 cycles, - 55 °C to + 125 °C
1 hour storage, 45 minutes rated power at - 55 °C
250 hours, no load at + 150 °C
(106)
240 hours at rated power with humidity ranging
from 80 % RH to 98 % RH
MIL-R-27208
REQUIREMENT
ΔR ≤
1.0 %
2
ΔR ≤
1.0 %
2,3
ΔR ≤
1.0 %
2,3
ΔR ≤
1.0 %
2
ΔR ≤
1.0 %
2
ΔR ≤
1.0 %
2,3
ΔR ≤
1.0 %
2,3
ΔR ≤
2.0 %
ΔR ≤
2.0 %
TYPICAL
CHANGE
ΔR
< 0.02 %
ΔR
< 0.01 %
ΔR
< 0.03 %
ΔR
< 0.02 %
ΔR
< 0.01 %
ΔR
< 0.07 %
ΔR
< 0.02 %
ΔR
< 0.04 %
ΔR
< 0.12 %
(210) + 350 °C for 3 seconds
(213) 18 shocks, 100 g, 6 ms, sawtooth, 3 axes
(204) 10 to 2000 Hz, 20 g, 12 hours, 3 axes
200 cycles
(108) 1000 hours at rated power at + 85 °C
Numbers in parenthesis refer to test method MIL-STD-202 as modified by the detail specification.
values below 100 ohms, add 0.05 ohm to the allowable change.
3
The referenced tests also require that setting stability change shall not exceed ± 1.0 percent plus the specified maximum resolution and
operating torque shall not exceed 150 % of the specified maximum.
DERATING
0.50
WATTS
0.40
0.30
0.20
0.10
0
25
50
75 85 100 125 150 175
AMBIENT TEMP. DEG. CENTIGRADE
ORDERING INFORMATION
12
S
MODEL
12
S
= Top Adjustment Screw
14
S
= Side Adjustment Screw
15
S
= PC Mount
17
S
= Top Adjustment Screw
18
S
= Side Adjustment Screw
501
VALUE
First two digits are
significant figures. Last
digit specifies number of
zeros to follow.
Document Number: 68017
Revision: 27-Jun-05
For technical questions contact te1resistors@vishay.com
www.vishay.com
31
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
www.vishay.com
1
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