Model ST-4
Surface Mount Trimming Potentiometer
4 mm Square Single Turn, Cermet
Features
zSealed to Allow for Automatic Processing
zVertical and Horizontal Adjustment Styles
zGull Wing, J Lead and Thru Hole Pin Styles
zPrecious Metal Alloy Contact
zTape and Reel, Magazine and Bulk Packaging
Part Number ST4 A 103
Model
Package Option
Blank = Bulk Pack
T = Tape & Reel/500 Units
M = Magazine/50 Units
Pin Style
Resistance Code
Marking
Units Marked With Resistance Code, and 2 Digit Date Code
Standard Resistance
Values and Codes
VCode VCode
10 100 10 K 103
20 200 20 K 203
50 500 50 K 503
100 101 100 K 104
200 201 200 K 204
500 501 500 K 504
1 K 102 1 M 105
2 K 202 2 M 205
5 K 502
SPECIFICATIONS
Electrical
Resistance Range : 10 Ohms to 2 Meg. Ohms
Resistance Tolerance : 620% Standard
Temp. Coeff. Of Resistance : 100 Ohms to 2 Meg. 6100 ppm, others 6
250 ppm.
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 : 210° Nominal.
Electrical Continuity : Continuous over full mechanical range.
End Resistance : 1% or 2 Ohms, whichever is greater.
Resolution : Essentially infinite.
Contact Resistance Variation : 1% or 3 Ohms, wichever 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 : 240° Nominal
Operating Torque : 100 gram-cm max. (1.39 Oz-in.)
Stop Strength, Min. : 300 gram-cm min. (4.17 Oz-in.)
Rotational Life : 100 cycles, (
m
R/R
<
2V+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, 6 axes, 3 times)
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:
(260°C, 10 Sec. or 215°C, 3 minutes)
m
R/R
<
1.00%
Immersion: Fluorocarbon Liquid, 85°C, 1 min. No Leaks
4
ST-4
Single Turn Cermet Surface Mount
ST-4A
J Lead
Top Adjust
ST-4B
Gull Wing
Top Adjust
ST-4G
J Lead
Side Adjust
SUGGESTED LAND
PATTERNS
A and B Styles Conform to
Industry Standard, VRCI
SMT—300, for 4 mm Single
Turn
Center Line of Part Falls on
Center Line
of Pattern
ST4A ST4B ST4G
Metric 1. Dimensions are in millimeters (inches in parentheses are for reference only).
2. Tolerances unless otherwise specified +/- 0.30 mm (+/- .012 inches).
3. See packaging options on following pages for packaging dimensions.
5
ST-4
Single Turn Cermet Surface Mount
ST-4C
Thru Hole
Top Adjust
ST-4D
Gull Wing
Bottom Adjust
Semi Standard
ST-4F
Thru Hole
Bottom Adjust
Semi Standard
ST-4H
Gull Wing
Side Adjust
Metric 1. Dimensions are in millimeters (inches in parentheses are for reference only).
2. Tolerances unless otherwise specified +/- 0.30 mm (+/- .012 inches).
3. See packaging options on following pages for packaging dimensions.
6
ST-4
Single Turn Cermet Surface Mount
ST-4M
Magazine Packaging Dimensions
ST4TA
ST4TB
Tape Dimensions
ST4TH
ST4TG
Tape Dimensions
8.0 60.1mm
(.315 6.004)
5.50 60.1 mm
(.217 6.002)
12. 60.3 mm
(.472 6.012)
0.30 60.1 mm
.012 6.002)
Reel Dimensions
Metric 1. Dimensions are in millimeters (inches in parentheses are for reference only).
2. Tolerances unless otherwise specified +/- 0.30 mm (+/- .012 inches). 7
