www.vishay.com
26
Models 117
S
, 126
S
, 151
S
and 176
S
Vishay Techno
Document Number 68016
Revision 23-Sep-99
3/8" [9.52mm] Sq. Wirewound Trimmers
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.
ELECTRICAL SPECIFICATIONS
Electrical Travel: 22
4 turns.
Resistance Range: 10 ohms to 10 kilohms. Extended
range available in non MIL-Spec product.
Resistance Tolerance:
5% standard. Closer tolerances
available.
Temperature Coefficient: (- 65
C to + 150
C)
50PPM/
C.
Power Rating: 1.0 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: >100,000 Megohms (500 VDC).
These specifications exceed MIL-Spec.
MECHANICAL SPECIFICATIONS
Operating Torque: 5 ounce inch maximum.
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.
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits: - 65
C to + 150
C.
Sealing: Fully sealed case (non-hermetic).
FEATURES
Precious metal wiper.
1.0 watt to + 85
C.
TCR
50PPM/
C.
Solderable leads.
Military quality at affordable prices.
STANDARD RESISTANCE VALUES
RESISTANCE*
NOMINAL RESOLUTION
(Ohms)
(%)
*Other resistances available upon request.
CIRCUIT DIAGRAM
DIMENSIONAL CONFIGURATIONS 3/8" [9.52mm] Square
[Numbers in brackets indicate millimeters]
L Lead Style - 117
S
P Lead Style - 126
S
#30 AWG leads, color coded
Teflon insulated
6" [152.40mm] minimum length
0.375
0.005
[9.52
0.127]
0.023
0.003
[.584
0.076]
0.375
0.005
[9.52
0.127]
0.100
0.005
[2.54
0.127]
0.040
0.010
[1.02
0.254]
0.100
0.005
[2.54
0.127]
1
2
3
0.060
0.005
[1.52
0.127]
Dia.
0.150
0.010
[3.81
0.254]
0.314
0.005
[7.98
0.127]
0.117
0.005
[2.97
0.127]
0.023
0.003
[.584
0.076]
G
CW
R
0.023
0.003
[.584
0.076]
0.419
0.010
[10.64
0.254]
0.075
0.010
[1.90
0.254]
Radius
0.380
0.005
[9.65
0.127]
0.055
0.005
[1.40
0.127]
Y
X
X
10
1.10
20
.85
50
.65
100
.51
200
.40
500
.45
1k
.34
2k
.27
5k
.20
10k
.16
20k
.13
25k
.12
35k
.11
50k
.10
1
3
2
CW
0.217
0.005
[5.51
0.127]
0.300 [7.62]
Min.
0.093
0.005
[2.36
0.127]
Dia.
0.313
0.005
[7.95
0.127]
0.025
0.003
[0.635
0.076]
0.167
0.005
[4.24
0.127]
0.027
0.002
[.686
0.051]
Dia.
www.vishay.com
27
Models 117
S
, 126
S
, 151
S
and 176
S
Vishay Techno
Document Number 68016
Revision 23-Sep-99
W Lead Style - 151
S
X Lead Style - 176
S
0.190
0.005
[4.83
0.127]
0.139
0.005
[3.53
0.127]
0.093
0.005
[2.36
0.127]
Dia.
0.100
0.005
[2.54
0.127]
0.100
0.005
[2.54
0.127]
0.190
0.005
[4.83
0.127]
0.139
0.005
[3.53
0.127]
0.314
0.005
[7.98
0.127]
0.093
0.005
[2.36
0.127]
Dia.
0.410
0.010
[10.41
0.254]
0.027
0.002
[.686
0.051]
Dia.
0.040
0.005
[1.02
0.127]
0.023
0.003
[.584
0.076]
0.025
0.003
[.635
0.076]
1
2
3
0.100
0.005
[2.54
.127]
0.375
0.005
[9.52
0.127]
0.100
0.005
[2.54
0.127]
0.300 [7.62]
Min.
0.346
0.005
[8.79
0.127]
0.410
0.005
[10.41
0.127]
0.025
0.003
[0.635
0.076]
0.023
0.003
[.584
0.076]
0.027
0.002
[.686
0.051]
Dia.
0.300 [7.62]
Min.
0.375
0.005
[9.52
0.127]
0.040
0.005
[1.02
0.127]
1
2
3
DIMENSIONAL CONFIGURATIONS 3/8" [9.52mm] Square
[Numbers in brackets indicate millimeters]
1
Numbers in parenthesis refer to test method MIL-STD-202 as modified by the detail specification.
2
For 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
0.05 percent plus the specified maximum resolution.
ENVIRONMENTAL PERFORMANCE
MIL-PRF-39015
TYPICAL
TEST
1
CONDITIONS
REQUIREMENT
CHANGE
Power Conditioning
(108)
50 hours at 1 watt at + 25
C
R
0.5%
2
R < 0.08%
Thermal Shock
(107)
5 cycles, -55
C to + 125
C
R
1.0%
2
R < 0.07%
Low Temperature Storage
72 hours, no load at - 65
C
R
1.0%
2
R < 0.05%
Low Temperature Operation
1 hour storage, 45 minutes rated power at - 55
C
R
1.0%
2,3
R < 0.08%
High Temperature Exposure
1000 hours, no load at + 150
C
R
1.0%
2,3
R < 0.03%
Moisture Resistance
(106)
480 hours at rated power with humidity ranging
R
1.0%
2
R < 0.22%
from 80% RH to 98% RH
Resistance to Soldering Heat
(210)
+ 350
C for 3 seconds
R
1.0%
2
R < 0.02%
Shock
(213)
18 shocks, 100g, 6 ms, sawtooth, 3 axes
R
1.0%
2,3
R < 0.27%
Vibration
(204)
10 to 2000 Hz, 20g, 12 hours, 3 axes
R
1.0%
2,3
R < 0.04%
Rotational Life
200 cycles
R
2.0%
R < 0.06%
Load Life
(108)
10,000 hours at rated power at + 85
C
R
3.0%
R < 0.23%
DERATING
HOW TO ORDER
WATTS
0
25
50
75 85 100
125
150
175
AMBIENT TEMP. DEG. CENTIGRADE
1.00
0.80
0.60
0.40
0.20
501
VALUE
First two digits are significant
figures. Last digit specifies
number of zeros to follow.
117
S
MODEL
117
S
= Teflon Leadwire
126
S
= PC Mount
151
S
= Top Adjustment Screw
176
S
= Side Adjustment Screw
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