12S, 14S, 15S, 17S, 18S
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Revision: 03-Apr-17 1Document Number: 68017
For technical questions, contact: sfer@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Multi-Turn 1/4" (6.35 mm) Square 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.
MECHANICAL SPECIFICATIONS
Operating torque: 3 oz.-inches maximum, 17S and 18S,
5 oz.-inches maximum, 12S, 14S and 15S
Rotation: clutch stop, wiper idles
Weight: 0.935 g maximum
Resistive element: nickel chromium
Rotational life: 200 cycles minimum
Terminal strength: 2 lbs for 10 s
FEATURES
• Precious metal wiper
• 0.25 W to +85 °C
• TCR < 50 ppm/°C
• Solderable leads
• Special configurations available
• Military quality at affordable prices
ENVIRONMENTAL SPECIFICATIONS
Temperature limits: -65 °C to +175 °C
Sealing: fully sealed case (non-hermetic)
Note
(1) Other resistances available upon request
ELECTRICAL SPECIFICATIONS
Electrical travel 22 turns ± 4 turns
Resistance range 10 to 5 k (extended range
available in non MIL-SPEC product)
Resistance tolerance ± 5 % standard
Temperature
coefficient (-65 °C to
+150 °C)
± 50 ppm/°C
Power rating
0.5 W at +85 °C derated to 0 W at
+150 °C, these specifications exceed
MIL-SPEC
End resistance 1 or 2 %, whichever is greater
Equivalent noise
resistance (ENR) 100 maximum
Dielectric (DWV)
1000 VAC at atmospheric pressure,
these specifications exceed
MIL-SPEC
Insulation resistance > 100 000 M (500 VDC), these
specifications exceed MIL-SPEC
STANDARD RESISTANCE VALUES
RESISTANCE (1)
()
NOMINAL RESOLUTION
(%)
10 1.65
20 1.35
50 1.13
100 0.82
200 0.62
500 0.62
1K 0.49
2K 0.34
5K 0.27
10K 0.21
20K 0.17
25K 0.16
CIRCUIT DIAGRAM
1
2
3
CW
GLOBAL PART NUMBER INFORMATION
New global part numbering: 12S500RB (preferred part number format)
GLOBAL MODEL TYPE RESISTANCE VALUE PACKAGING
12 = top adjustment screw
14 = side adjustment screw
15 = PC mount
17 = top adjustment screw
18 = side adjustment screw
/ = continuous rotation
S = clutch stop
R = decimal
K = thousand
100R = 100
5K00 = 5 k
B = bulk
Historical part numbering: 12s501 (will continue to be accepted)
12 s 501
HISTORICAL MODEL TYPE RESISTANCE VALUE
S50 RB012
12S, 14S, 15S, 17S, 18S
www.vishay.com Vishay Techno
Revision: 03-Apr-17 2Document Number: 68017
For technical questions, contact: sfer@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Notes
(1) Numbers in parenthesis refer to test method MIL-STD-202 as
modified by the detail specification.
(2) For values below 100 , add 0.05 to the allowable change.
(3) The referenced tests also require that setting stability change
shall not exceed ± 1.0 % plus the specified maximum resolution
and operating torque shall not exceed 150 % of the specified
maximum.
DIMENSIONS 1/4" (6.35 mm) SQUARE in inches (millimeters)
W Lead Style - 17S
123
0.030 ± 0.010
(0.762 ± 0.254)
0.100 ± 0.005
(2.54 ± 0.127)
0.100 ± 0.005
(2.54 ± 0.127)
0.038 ± 0.005
(0.965 ± 0.127)
0.016 ± 0.001
(0.406 ± 0.025)
Dia.
0.020 ± 0.003
(0.508 ± 0.076) 0.045 ± 0.005
(1.14 ± 0.127)
0.172 (4.37)
Min.
0.020 ± 0.003
(0.508 ± 0.076) 0.260 ± 0.005
(6.60 ± 0.127)
0.211 ± 0.005
(5.36 ± 0.127)
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)
X Lead Style - 18
S
0.100 ± 0.005
(2.54 ± 0.127)
0.038 ± 0.005
(0.965 ± 0.127) 0.100 ± 0.005
(2.54 ± 0.127)
0.030 ± 0.010
(0.762 ± 0.254)
0.211 ± 0.005
(
5.36 ±
0.127)
0.062 ± 0.005
(1.57 ± 0.127)
0.120 ± 0.005
(3.05 ± 0.127)
0.160 ± 0.010
(0.406 ± 0.254)
0.172 (4.37)
Min.
0.260 ± 0.005
(6.60 ± 0.127)
0.045 ± 0.005
(1.14 ± 0.127)
0.016 ± 0.001
(0.406 ± 0.025)
Dia.
0.020 ± 0.003
(0.508 ± 0.076)
0.020 ± 0.003
(0.508 ± 0.076)
P Lead Style - 15
S
0.082
(2.08)
0.050 ± 0.010
(1.27 ± 0.254)
0.250 ± 0.015
(6.35 ± 0.381)
0.125
(3.17)
0.100
(2.54)
0.100
(2.54)
0.014 (0.356)
Min.
0.055 ± 0.010
(1.40 ± 0.254)
0.020
(0.508)
2
1
3
0.062 ± 0.002
(1.57 ± 0.051)
Dia.
0.020 ± 0.0015
(0.508 ± 0.038)
Dia.
0.180 ± 0.015
(4.57 ± 0.381)
1.72
(4.37)
Min.
0.156
(3.96)
W Lead Style - 12
S
0.120 ± 0.010
(3.05 ± 0.254)
0.156 ± 0.010
(3.96 ± 0.254)
0.062 ± 0.002
(1.57 ± 0.051)
Dia.
0.038
(0.965)
0.100
(2.54)
0.013 ± 0.001
(0.330 ± 0.025)
Dia.
0.020
(0.508)
0.250 ± 0.015
(6.35 ± 0.381)
0.014 (0.356)
Min.
0.172
(4.37)
Min.
0.050 ± 0.010
(1.27 ± 0.254)
1
2
3
X Lead Style - 14
S
0.062 ± 0.002
(1.57 ± 0.051)
Dia.
0.120 ± 0.010
(3.05 ± 0.254) 0.156 ± 0.010
(3.96 ± 0.254)
0.038
(0.965)
0.100
(2.54)
0.014 (0.356)
Min.
0.172 (4.37)
Min.
0.020
(0.508)
0.210
(5.33)
0.013 ± 0.001
(0.330 ± 0.025)
Dia.
0.050 ± 0.010
(1.27 ± 0.254)
0.250 ± 0.015
(6.35 ± 0.381)
3
2
1
ENVIRONMENTAL PERFORMANCE
TEST (1) CONDITIONS MIL-R-27208
REQUIREMENT
TYPICAL
CHANGE
Thermal shock (107) 5 cycles, -55 °C to +125 °C R 1.0 % (2) R < 0.02 %
Low temperature operation 1 h storage, 45 min rated power at -55 °C R 1.0 % (2)(3) R < 0.01 %
High temperature exposure 250 h, no load at +150 °C R 1.0 % (2)(3) R < 0.03 %
Moisture resistance (106) 240 h at rated power with humidity ranging
from 80 % RH to 98 % RH R 1.0 % (2) R < 0.02 %
Resistance to soldering heat (210) +350 °C for 3 s R 1.0 % (2) R < 0.01 %
Shock (213) 18 shocks, 100 g, 6 ms, sawtooth, 3 axes R 1.0 % (2)(3) R < 0.07 %
Vibration (204) 10 Hz to 2000 Hz, 20 g, 12 h, 3 axes R 1.0 % (2)(3) R < 0.02 %
Rotational life 200 cycles R 2.0 % R < 0.04 %
Load life (108) 1000 h at rated power at +85 °C R 2.0 % R < 0.12 %
DERATING
0 25 50 75 85 100 125 150 175
W
0.50
0.40
0.30
0.20
0.10
AMBIENT TEMPERATURE °C
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Revision: 08-Feb-17 1Document Number: 91000
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