1
1-5 Model 21
Temperature Coefficient, Maximum ±250ppm/°C
Operating Temperature Range –40°C to +100°C
Thermal Shock 5 cycles, –40°C to +100°C (5% ∆RT)
Rotational Life 25 cycles (10% ∆RT)
Load Life at 0.1 Watts 1,000 hours at 70°C (15% ∆RT)
Resistance to Solder Heat 260°C for 5 sec. (2% ∆RT)
Humidity 40°C, 90 to 95% RH, 500 hours (5% ∆RT)
Temperature Exposure, Maximum 248°C, 3 sec.
Standard Resistance Range, Ohms 500 to 500K
Standard Resistance Tolerance ±30%
Input Voltage, Maximum 50 Vdc or rms not to exceed power rating
Power Rating, Watts 0.1 at 70°C derating to 0 at 100°C
End Resistance, Maximum 1% or 5 Ohms, whichever is greater
Actual Electrical Travel, Nominal 250°
Resolution Essentially infinite
Contact Resistance Variation, Maximum 3%
MECHANICAL
Torque, Maximum 4 oz.-in. (300 gr-cm)
Weight, Nominal .004 oz. (0.11 grams)
ENVIRONMENTAL
MODEL 21
4mm Surface Mount Chip
Cermet Trimming
Potentiometers
ELECTRICAL
Specifications subject to change without notice.
1-6 Model 21
1-6
TOP ADJUSTMENT
,
,
,
,
,
,
,
,
.15
3.8
.18
4.5
.09
2.2
.09
2.2 Dia
.04
1.0
.06
1.5 .02
0.5
.13
3.4
.05
1.2
.01
0.3
.01
0.3
.03 ± .004
0.8 ± 0.10
(2) (1)
.02 ± .01
0.4 ± 0.2 .03
0.7
.02 ± .008
0.5 ± 0.20
,,
,,
,,
,,
,
,
,
,
,,
,,
,
,
,
,,
,,
,,
,
,
,
,
Max.
.04
1.0
.04
1.0
TOP ADJUSTMENT
,
,
,
,
,,
,,
,
,
,
.15
3.8
.18
4.5
.09
2.2
.09
2.2 Dia
.06
1.5 .02
0.5
.06
1.5
.027
0.68
Typ.
.01
0.2
.01
0.2
.03±.004
0.8±0.10
(3) (2) (1)
.02±.01
0.4±0.2
.135(.027 x 5)
3.40 (0.68 x 5)
.03
0.7
.02±.008
0.5±0.20
,,
,,
,,
,,
,
,
,
,
,
,,
,,
,
Max.
.04
1.0
,
,
,,
,,
,
,
,,
,,
,,
,
,
,
,,
,
Model 21W
Model 21X
1
1-7 Model 21
1-7
TOP ADJUSTMENT
,
,
,,
,,
,,
,
,
,
,
,
,
,
,,
,
,
,
,
,
,,
,,
,,
.15
3.8
.14
3.5 Dia.
.05
1.2 Dia.
Slot
Wide x .18
4.5
.09
2.2
Max.
.01
0.2
2x R.
.13
3.4
.03 ±. 004
0.8 ± 0.1
.07 ± .004
1.8 ± 0.1 (2)
(1)(3)
.03 ± .004
0.8 ± 0.1
.03 ± .004
0.8 ± 0.1
.02 ± .002
0.6 ± 0.06
.085 ± .004
2.15 ± 0.1
.022 ± .002
0.55 ± 0.05
Deep x
.016 ± .002
0.40 ± 0.05
Long
.095 ± .002
2.40 ± 0.05
.08 ± .004
2.0 ± 0.1
,
,,
,,
,,
,
,
,
,
,
,
,,
,,
,,
,,
.03 ± .004
0.8 ± 0.1
RECOMMENDED PCB LAYOUT
.09
2.4
.06
1.6
.09
2.4
.07
1.7 .07
1.7
.17
4.2
.06
1.6
.22
5.6
.09
2.4
.06
1.6
.07
1.9
.09
2.4
.04
1.0
.04
1.0
.04
1.0
.16
4.0
.08
2.1
.22
5.6
.08
2.0
.06
1.4
.06
1.5
.05
1.2
.04
0.9
.04
0.9
.07
1.8
.14
3.6
.05
1.3
.21
5.4
.10
2.6
Model 21W Model 21X Model 21Z
Model 21Z
Standard: Boxes
Capacity = 200 units
Option: Embossed Tape
All units oriented with terminal pads adjacent to sprocket holes
Tape: Width = 12 mm
Sprocket = 4 mm Pitch
Capacity = 750 units
Reel: Diameter = 7” (178mm)
Model 21
1-8
NOTES
mm
INCH
English equivalents are based on 1 inch = 25.4mm
and are provided for general information only.
Tolerances unless otherwise specified:
Linear = ± 0.3 mm (.01 in.)
CIRCUIT DIAGRAM
(1)
(2)
(3)
CW
Models 21X AND 21Z
Model 21W
(1) (2)
CW
21 X R 10K
Model Series
Style
Resistance Value
Resistance Prefix
21 X R 10K TR
Style Packaging Option
TR = Tape & Reel
PACKAGING
ORDERING INFORMATION
Standard:
Option:
STANDARD RESISTANCE VALUES, OHMS
500 1K 2K 5K 10K 20K 50K 100K 200K 500K
