Top
adjustment
Nominal resistance range
ST-4
SURFACE MOUNT TRIMMERS
：
Not manufactured
※The above part numbers are all available with the respective combination 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.
※Cross slot available : ST-42E □
■
LIST OF PART NUMBERS
Adjustment
position
Rear
adjustment
Side
adjustment
Pieces in package
Shape of terminal
A (J-hook)
G (J-hook)
B (Gull wing)
D (Gull wing)
H (Gull wing)
C (Through hole pins)
F (Through hole pins)
Form of packaging
Taping (reel)
ST-4/42ETA ST-4/42EA
ST-4/42ETB ST-4/42EB
ST-4/42EC
A ST-4/42ETD A ST-4/42ED
A ST-4/42EF
ST-4/42ETG ST-4/42EG
ST-4/42ETH ST-4/42EH
Plastic bag
500 pcs./reel 100 pcs./pack
The products indicated by A mark are manufactured upon receipt of order basis.
※C slot : ST-4E
□
, B slot : ST-42E
□
〈
Nominal resistance values
〉
A10 A20 50 100 200 500 1 k 2 k 5 k
10 k 20 k 50 k 100 k 200 k 500 k 1 M 2 M
ΔR/R：Change in total resistance
S.S. ：Setting stability
■
ELECTRICAL CHARACTERISTICS
■
MECHANICAL CHARACTERISTICS
10 Ω ~ 2 MΩ
± 20 %
0.25 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. 0.12 g (ST-4EA, EB, EC, ED, EF)
Approx. 0.22 g (ST-4EG, 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
Mechanical angle 240° (1 turn)
10 mN·m {102 gf·cm} maximum
30 mN·m {306 gf·cm} minimum
100 cycles [ΔR/R ≦ ± (2 + 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
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 (80 ~ 98 %),
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, 0.25 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
{ }
：
Reference only
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
