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
13
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.