Adjustment
position
A (J-hook)
G (J-hook)
B (Gull wing)
H (Gull wing)
ST-32
SURFACE MOUNT TRIMMERS
■
LIST OF PART NUMBERS
Shape of
terminal
Form of packaging
Taping (reel)
ST-32ETA ST-32EA
ST-32ETB ST-32EB
ST-32ETG ST-32EG
ST-32ETH ST-32EH
500 pcs./reel 100 pcs./pack
Plastic bag
Pieces in package
■
ELECTRICAL CHARACTERISTICS
Nominal resistance range 10 Ω ~ 2 MΩ
± 20 %
0.125 W (70 °C) 0 W (125 °C)
Linear law (B)
DC200 V or power rating, whichever is smaller
100 mA or power rating, whichever is smaller
210 ° (1 turn)
1 % or 2 Ω, whichever is greater
1 % or 3 Ω, whichever is greater
− 55 ~ 125 °C
10 Ω ~ 50 Ω : ± 250 10
-6
/°C maximum
100 Ω ~ 2 MΩ : ± 100 10
-6
/°C maximum
1000 MΩ minimum (DC500 V)
AC500 V, 60 s
Approx. 0.05 g (ST-32EA, EB)
Approx. 0.11 g (ST-32EG, EH)
Resistance tolerance
Power ratings
Resistance law
Maximum input voltage
Maximum wiper current
Effective electrical angle
End resistance
C.R.V.
Operating temp. range
Temp. coefficient
Insulation resistance
Dielectric strength
Net weight
Top
adjustment
Side
adjustment
ΔR/R：Change in total resistance
S.S. ：Setting stability
〈
Nominal resistance values
〉
A
10 Ω
A
20 Ω 50 Ω 100 Ω 200 Ω 300 Ω 500 Ω
1 kΩ 2 kΩ 3 kΩ 5 kΩ 10 kΩ 20 kΩ 30 kΩ
50 kΩ 100 kΩ 200 kΩ 500 kΩ 1 MΩ 2 MΩ
The products indicated by A mark are manufactured upon receipt of order basis.
※The part numbers on the left are all available with the respective com bi na tion of
<Nominal resistance values> (Fig. 1).
※Verify the above part numbers when placing orders.
※Taping specification is not sold separately and must be purchased in reel units.
■
MECHANICAL CHARACTERISTICS
Mechanical angle 250 ° (1 turn)
5 mN·m {51 gf·cm} maximum
20 mN·m {204 gf·cm} minimum
100 cycles [ΔR/R ≦ ± (2 Ω + 3 %)]
5 N {0.51 kgf} minimum
245 ± 3 °C, 2 ~ 3 s
5 N {0.51 kgf} 10 s
Width 90 mm, bend 3 mm, 5 s, 1 time
5 N {0.51 kgf} 10 s
{ }
：
Reference only
Operating torque
Stop strength
Rotational life
Thrust to rotor
Solderability
Shear (Adhesion)
Substrate bending
Pull-off strength
■
ENVIRONMENTAL CHARACTERISTICS
Test item Test conditions Specifications
Thermal shock
− 65 ~ 125 °C (0.5 h), 5 cycles
[ΔR/R ≦ 2 %]
[S.S. ≦ 1 %]
Humidity
−10 ~ 65 °C ,
10 cycles, 240 h
[ΔR/R ≦ 2 %]
Shock
981 m/s
2
, 6 ms
6 directions for 3 times each
[ΔR/R ≦ 1 %]
[S.S. ≦ 1 %]
Vibration
(Amplitude) 1.52 mm or
(Acceleration) 196 m/s
2
,
10 ~ 2000 Hz, 3 directions, 12 times each
Load life 70 °C, 0.125 W, 1000 h
[ΔR/R ≦ 3 %]
[S.S. ≦ 1 %]
Low temp. operation
− 55 °C, 2 h
[ΔR/R ≦ 2 %]
[S.S. ≦ 2 %]
High temp. exposure
125 °C, 250 h
[ΔR/R ≦ 3 %]
[S.S. ≦ 2 %]
Immersion seal 85 °C, 60 s
No leaks (No continuous bubbles)
Soldering heat [ΔR/R ≦ 1 %]
Fig.1
Reflow profile for soldering heat evaluation
〉
Reflow : two times maximum
Peak : 250
Over 230 C
Pre Heating Zone
180 C
(C)
250
200
150
100
50
150 C
90 30 s
30 10 s
Soldering Zone
Heating time
Temperature
C
+5
0
Flow : 260 ± 3 °C as the temperature in a pot of
molten solder, immer sion from head of ter minal
to backside of board, 5 ~ 6 s, two times
maximum.
Reflow : Peak temperature 255 °C
(Please refer to the profile below.)
Manual soldering：350 ± 10 °C, 3 ~ 4 s
