ST-7
SURFACE MOUNT CERMET TRIMMERS (3 TURNS)
● RoHS compliant
● Fine adjustment is possible
● Automatic mounting is possible (Taping)
● Flow/reflow soldering is possible
● Sealed construction (Washable: Refer to page 698.)
■
FEATURES
Part name Material Flammability
1
2
3
4
5
6
7
8
9
!0
!1
!2
!3
Wiper
Shaft
Housing base
Housing
Shaft “O” ring
Base “O” ring
Clutch spring
Cover
Terminal pin
Base element
Resistive element
Rotor gear
Electrode
Polyphenylenesulphide
Polyphenylenesulphide
Polyphenylenesulphide
Silicone rubber
Stainless steel
Copper alloy, Sn-Cu-plated
UL94V-0
Ceramic
—
—
Ag-Pd cermet
RuO2 cermet
UL94V-0
UL94HB
—
UL94V-0
Multi metal alloy
INTERNAL STRUCTURE
■
PART NUMBER DESIGNATION
※Please refer to the LIST OF PART NUMBERS when placing orders.
S T - 7 E T A 1 k Ω ( 1 0 2 )
Series name
Form of packaging
T：Taping (Reel)
Blank：Bulk in plastic bag
Terminal pin
E：Sn-Cu (Lead-free)
Resistance code
Resistance value
Product shape (Shape of terminal)
A：J-hook
B：Gull wing
ST-7 構造図
!0
8
!2
!3
1
9
!1
3
7652
4
RoHS compliant
Pieces in package
Test item Test conditions Specifications
Thermal shock
Humidity
Shock
Vibration
Load life
Low temp. operation
High temp. exposure
Immersion seal
Soldering heat
Mechanical turn
Operating torque
Mechanical stop
Rotational life
Thrust to shaft
Solderability
Shear (Adhesion)
Substrate bending
Pull-off strength
Nominal resistance range
Resistance tolerance
Power ratings
Resistance law
Maximum input
voltage
Maximum wiper
current
Effective electrical
turn
End resistance
C.R.V.
Operating temp.
range
Temp. coefficient
Insulation resistance
Dielectric strength
Net weight
Top adjustment
Adjustment
position Shape of terminal
Form of packaging
Taping (reel) Plastic bag
ST-7
SURFACE MOUNT TRIMMERS
※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.
■
LIST OF PART NUMBERS
A( )
J-hook
B()
Gull wing
ST-7ETA ST-7EA
ST-7ETB ST-7EB
500 pcs./reel 50 pcs./pack
<Nominal resistance values>
50 Ω 100 Ω 200 Ω 500 Ω 1 k Ω 2 k Ω 5 k Ω
10 k Ω 20 k Ω 50 k Ω 100 k Ω 200 k Ω 500 k Ω 1 MΩ
ΔR/R：Change in total resistance
S.S. ：Setting stability
■
ELECTRICAL CHARACTERISTICS
■
MECHANICAL CHARACTERISTICS
50 Ω ~ 1 M Ω
± 20 %
0.25 W (70 °C) 0 W (125 °C)
Linear law
DC200 V or power rating, whichever is smaller
100 mA or power rating, whichever is smaller
2.5 turns
1 % or 2 Ω, whichever is greater
1 % or 3 Ω, whichever is greater
−55 ~ 125 °C
50 Ω : ± 250 10-6/°C maximum
100 Ω ~ 1 MΩ : ± 100 10-6/°C maximum
1000 M Ω minimum (DC500 V)
AC600 V, 60 s
Approx. 0.25 g
3 turns
5 mN·m {51 gf·cm} maximum
Clutch action
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
■
ENVIRONMENTAL CHARACTERISTICS
−65 ~ 125 °C (0.5 h), 5 cycles [ΔR/R ≦ 2 %]
[S.S. ≦ 1 %]
−10 ~ 65 °C (80 ~ 98 %),
10 cycles, 240 h
[ΔR/R ≦ 2 %]
981 m/s2, 6 ms
6 directions for 3 times each [ΔR/R ≦ 1 %]
[S.S. ≦ 1 %]
(Amplitude) 1.52 mm or
(Acceleration) 196 m/s2,
10 ~ 2000 Hz, 3 directions, 12 times each
70 °C, 0.25 W, 1000 h [ΔR/R ≦ 3 %]
[S.S. ≦ 1 %]
−55 °C, 2 h [ΔR/R ≦ 2 %]
[S.S. ≦ 2 %]
125 °C, 250 h [ΔR/R ≦ 3 %]
[S.S. ≦ 2 %]
85 °C, 60 s
No leaks
(No continuous bubbles)
[ΔR/R ≦ 1 %]
Fig. 1
{ }
：
Reference only
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.)
手はんだ
Manual soldering：350 ± 10 °C, 3 ~ 4 s
〈
Reflow profile for soldering heat evaluation
〉
Reflow : two times maximum
Peak : 250
Over 230 ℃
Pre Heating Zone
180 ℃
(℃)
250
200
150
100
50
150 ℃
90 ± 30 s
30 ± 10 s
Soldering Zone
Heating time
Temperature
℃
+5
0
Nominal resistance
values ( Ω)
Resistance code Maximum input
voltage (V)
Maximum wiper
current (mA)
■
MAXIMUM INPUT RATINGS
50 500 3.53 70.7
100 101 5.00 50.0
200 201 7.07 35.4
500 501 11.2 22.4
1 k 102 15.8 15.8
2 k 202 22.4 11.2
5 k 502 35.4 7.07
10 k 103 50.0 5.00
20 k 203 70.7 3.54
50 k 503 112 2.24
100 k 104 158 1.58
200 k 204 200 1.00
500 k 504 200 0.40
1 M 105 200 0.20
■
RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS
● ST-7EA ● ST-7EB (Unit: mm)
Note) The zero point is the center of mounting.
※
The ST-7 series has a different terminal arrange-
ment from the ST-32 and ST-4 series. Pay attention
to the location of terminals number 1 and 3.
(Resistance decreases when the shaft is turned
CCW.)
2
23.52
1.6 1.6
2.35
0
2
25.52
1.6 1.6
2.35
0
ST-7A 外形図
6.4
6.1
1.5
1.5
6.8 –0.5
0
3.4
0.02 min.
2.3
2 – 0.8
4.3
1.2
t = 0.15
0.5 W × 1.8 L × 0.5 D
3
1
2
Resistance code & Production date code
Lead-free Identification mark
ST-7B 外形図
6.4
1.5
6.1
1.5
7.8
2.3
2 – 0.8
1.2
3.4
0.35 min.
0.35 min.
0.02 min.
3
1
2
t = 0.15
Resistance code & Production date code
0.5 W × 1.8 L × 0.5 D
Lead-free Identification mark
CW rotation
1
2
3
ST-7
SURFACE MOUNT TRIMMERS
ΔR/R：Change in total resistance
S.S. ：Setting stability
■
OUTLINE DIMENSIONS Unless otherwise specified, tolerance : ± 0.3 (Unit : mm)
● ST-7EA
Top adjustment
● ST-7EB
Top adjustment
ST-7
SURFACE MOUNT TRIMMERS
<Bulk pack packaging specifications>
● Unit of bulk in a plastic bag is 50 pcs. per pack.
● Boxing of bulk in a plastic bag is performed with 200
pcs. per box.
■
PACKAGING SPECIFICATIONS
Maximum number of consecutive missing pieces = 2
Leader length and reel dimension are shown in the dia-
grams below.
<Taping packaging specifications>
● Taping version is packaged in 500 pcs. per reel.
Orders will be accepted for units of 500 pcs., i.e., 500,
1000, 1500 pcs., etc.
● Taping version is boxed with one reel (500 pcs.).
● EMBOSSED TAPE DIMENSIONS ● REEL DIMENSIONS
（Conforms to JIS C 0806-3）
（In accordance with EIAJ ET-7200A）
(Unit: mm)
● ST-7ETA ● ST-7ETB
Empty Filled Empty
40 mm min. 20 pitches min.
400 mm min.
Direction of feed
HeadEnd
Leader
50 min.
17.4±1
2±0.5
254±221.4±1
21±0.8
13±0.2
ST-7TA Taping
Direction of feed
12 ± 0.1
4 ± 0.1 2 ± 0.1
1.75 ± 0.17.5 ± 0.1
16
1.5
+0.1
0
0.4 ± 0.1
5
Installation example
(ST-7EA)
φ
ST-7TB Taping
Direction of feed
12 ± 0.1
4 ± 0.1 2 ± 0.1
1.75 ± 0.1
7.5 ± 0.1
16
φ
1.5
+0.1
0
0.4 ± 0.1
5
Installation example
(ST-7EB)
