Model ST-7
Surface Mount Trimming Potentiometer
7 mm Square Multiturn, Cermet
Features
zSealed to Allow for Automatic Processing
zPrecious Metal Alloy Contact
zTape and Reel and Bulk Packaging
Part Number ST7 A 103
Model
Package Options
Blank = Bulk Pack
T = Tape and Reel/500 Units
Pin Style
Resistance Code
Marking
Units Marked With Resistance Code, 2 Digit Date Code and
Model Designation
Refer to Model ST5TP/ST5TR for Tape and Reel
Dimensions.
Standard Resistance
Values and Codes
VCode VCode
50 500 10 K 103
100 101 20 K 203
200 201 50 K 503
500 501 100 K 104
1 K 102 200 K 204
2 K 202 500 K 504
5 K 502 1 M 105
SPECIFICATIONS
Electrical
Resistance Range : 50 Ohms to 1 Meg. Ohms
Resistance Tolerance : 620% Standard
Temp. Coeff. Of Resistance : 100 Ohms to 1 Meg., 6100 ppm/°C 50V
6250 ppm/°C.
Power Rating : 1/4 Watt at 70°C
Operating Voltage Max. : 200 VDC or Power Rating, whichever is
less.
Wiper Current Max. : 100 mA or power rating, whichever is less.
Electrical Angle, Nominal : 2.5 Turns Nominal.
Electrical Continuity : Continuous over full mechanical range.
End Resistance : 1% or 3 Ohms, whichever is greater.
Resolution : Essentially infinite.
Contact Resistance Variation : 1% or 3 Ohms, whichever is greater.
Operating Temp. Range : -55°C to 125°C.
Insulation Resistance, Min. : Min. 1000 Meg. at 500 VDC for 2 minutes.
Dielectric Strength : 500 VAC rms, 1 minute, 1 milliamp max.
Mechanical
Mechanical Angle, Nominal : 3 Turns Nominal
Operating Torque : 50 gram-cm (0.70 Oz-in.) max.
Stop Strength, Min. : Not Applicable, Wiper Idles
Rotational Life : 100 cycles (
m
R/R
<
2.0 V+3%)
Environmental (MIL-R-22097)
Thermal Shock:
(-65°C to 125°C)
m
R/R
<
2.00%
m
SS
<
1.00%
Humidity:
(80 ˜98% RH, 240 Hrs.)
m
R/R
<
2.00%
Mech. Shock:
(100 g)
m
R/R
<
1.00%
m
SS
<
1.00%
Vibration:
(20 g, 10 to 2000 Hz.)
m
R/R
<
1.00%
m
SS
<
1.00%
Low Temp. Operation:
(-55°C, 2 Hrs.)
m
R/R
<
2.00%
m
SS
<
2.00%
High Temp. Exposure:
(125°C, 250 Hrs.)
m
R/R
<
3.00%
m
SS
<
2.00%
Load Life:
(70°C, 0.25 W, 1000 Hrs.)
m
R/R
<
3.00%
m
SS
<
1.00%
Soldering Heat:
(215°C, 35 Sec. or 260°C, 10 Sec.)
m
R/R
<
1.00%
Immersion: Fluorocarbon Liquid, 85°C, 1 min. No Leaks
12
ST-7
Multiturn Sealed Surface Mount
ST-7A
J Lead
Top Adjust
ST-7B
Gull Wing
Top Adjust
ST-7A ST-7B
Suggested Land Patterns
Metric 1. Dimensions are in millimeters (inches in parentheses are for reference only).
2. Tolerances unless otherwise specified +/- 0.30 mm (+/- .012 inches). 13
