SURFACE MOUNT CERMET TRIMMERS (3 TURNS)
ST-7
INTERNAL STRUCTURE
1
9
!1
3
!0
4
7 6 5 2
Material
Polyphenylenesulphide
Ceramic
Copper alloy, Sn-Cu-plated
—
Resistive element
Electrode
Housing base
Wiper
Shaft
Polyphenylenesulphide
Housing
Shaft “O” ring
Silicone rubber
Base “O” ring
Clutch spring
Stainless steel
Cover
—
UL94HB
UL94V-0
RuO
2
cermet
Ag-Pd cermet
Polyphenylenesulphide
Multi metal alloy
UL94V-0
—
Flammability
UL94V-0
RoHS compliant
!3
!2
8
Part name
1
Rotor gear
Base element
Terminal pin
■
FEATURES
RoHS compliant
Fine adjustment is possible
Automatic mounting is possible (Taping)
Flow/reflow soldering is possible
Sealed construction (Washable: Refer to page 750.)
2
3
4
5
6
7
8
9
!0
!1
!2
!3
■
PART NUMBER DESIGNATION
S T - 7 E T A 1 k
Ω
( 1 0 2 )
Series name
Terminal pin
E：Sn-Cu (Lead-free)
Resistance code
Resistance value
Form of packaging
T：Taping (Reel)
Blank：Bulk in plastic bag
Product shape (Shape of terminal)
A：J-hook
B：Gull wing
※Please
refer to the LIST OF PART NUMBERS when placing orders.
ST-7
SURFACE MOUNT TRIMMERS
■
LIST OF PART NUMBERS
Adjustment
position
Form of packaging
Shape of terminal
Taping (reel)
Plastic bag
<Nominal resistance values>
50
Ω
10 kΩ
100
Ω
20 kΩ
200
Ω
500
Ω
1 kΩ
2 kΩ
5 kΩ
50 kΩ 100 kΩ 200 kΩ 500 kΩ 1 MΩ
Fig. 1
A (J-hook)
Top adjustment
ST-7ETA
ST-7ETB
500 pcs./reel
ST-7EA
ST-7EB
50 pcs./pack
B (Gull wing)
Pieces in package
※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.
■
ELECTRICAL CHARACTERISTICS
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
50
Ω
~ 1 MΩ
±
20 %
0.25 W (70 °C) 0 W (125 °C)
（B）
Linear law
■
MECHANICAL CHARACTERISTICS
Mechanical turn
Operating torque
Mechanical stop
Rotational life
Thrust to shaft
Solderability
Shear (Adhesion)
Substrate bending
Pull-off strength
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
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 /°C maximum
100
Ω
~ 1 MΩ :
±
100 10
-6
/°C maximum
-6
{ }
：
Reference only
■
ENVIRONMENTAL CHARACTERISTICS
Test item
Thermal shock
Humidity
Shock
Vibration
Test conditions
−
65 ~ 125 °C (0.5 h), 5 cycles
−10
~ 65 °C (80 ~ 98 %),
10 cycles, 240 h
981 m/s
2
, 6 ms
6 directions for 3 times each
(Amplitude) 1.52 mm or
(Acceleration) 196 m/s
2
,
10 ~ 2000 Hz, 3 directions, 12 times each
70 °C, 0.25 W, 1000 h
Specifications
[ΔR/R
≦
2 %]
[S.S.
≦
1 %]
[ΔR/R
≦
2 %]
1000 MΩ minimum (DC500 V)
AC600 V, 60 s
Approx. 0.25 g
[ΔR/R
≦
1 %]
[S.S.
≦
1 %]
[ΔR/R
≦
3 %]
[S.S.
≦
1 %]
[ΔR/R
≦
2 %]
[S.S.
≦
2 %]
[ΔR/R
≦
3 %]
[S.S.
≦
2 %]
No leaks (No continuous bubbles)
Reflow profile for soldering heat evaluation
〉
(C)
250
Temperature
200
150
100
50
Peak : 250
+5
0
Load life
Low temp. operation
−55
°C, 2 h
125 °C, 250 h
85 °C, 60 s
Flow : 260
±
3 °C as the temperature in a
pot of molten solder, immersion from head
of terminal 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
C
High temp. exposure
Immersion seal
Over 230 C
180 C
150 C
90 30 s
30 10 s
Heating time
Soldering Zone
Pre Heating Zone
Soldering heat
[ΔR/R
≦
1 %]
Reflow : two times maximum
ΔR/R：Change
in total resistance
S.S.
：Setting
stability
ST-7
SURFACE MOUNT TRIMMERS
■
MAXIMUM INPUT RATINGS
Nominal resistance
Maximum input
Resistance code
values (Ω)
voltage (V)
50
100
200
500
1k
2k
5k
10 k
20 k
50 k
100 k
200 k
500 k
1M
500
101
201
501
102
202
502
103
203
503
104
204
504
105
3.53
5.00
7.07
11.2
15.8
22.4
35.4
50.0
70.7
112
158
200
200
200
Maximum wiper
current (mA)
70.7
50.0
35.4
22.4
15.8
11.2
7.07
5.00
3.54
2.24
1.58
1.00
0.40
0.20
■
RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS
ST-7EA
2
ST-7EB
2
2
2
3.5
2
1.6
2.35
1.6
1.6
2.35
Note) The zero point is the center of mounting.
(Unit: mm)
1.6
■
OUTLINE DIMENSIONS
ST-7EA
Top adjustment
6.4
Lead-free Identification mark
Unless otherwise specified, tolerance :
±
0.3 (Unit : mm)
1
3
CW rotation
0.5 W
×
1.8 L
×
0.5 D
1.5
1.5
3.4
0
6.8
–0.5
2
1.2
2
6.1
1
t = 0.15
0.02 min.
2.3
2 – 0.8
3
Resistance code & Production date code
ST-7EB
Top adjustment
6.4
2
Lead-free Identification mark
0.5 W
×
1.8 L
×
0.5 D
1.5
1.5
3.4
0.35 min.
1.2
6.1
1
3
0.35 min.
t = 0.15
7.8
2 – 0.8
2.3
0.02 min.
Resistance code & Production date code
※
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.)
4.3
2
5.5
0
0
ST-7
SURFACE MOUNT TRIMMERS
■
PACKAGING SPECIFICATIONS
<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.).
Maximum number of consecutive missing pieces = 2
Leader length and reel dimension are shown in the dia-
grams below.
EMBOSSED TAPE DIMENSIONS
（Conforms
to JIS C 0806-3）
（In
accordance with EIAJ ET-7200A）
(Unit: mm)
Empty
Filled
Empty
17.4±1
End
Head
40 mm min.
20 pitches min.
400 mm min.
Direction of feed
13±0.2
254±2
21.4±1
ST-7ETA
1.750.1
120.1
40.1
20.1
0.40.1
Installation example
(ST-7EA)
ST-7ETB
1.750.1
120.1
40.1
20.1
0.40.1
Installation example
(ST-7EB)
7.50.1
7.50.1
16
Direction of feed
5
Direction of feed
16
5
<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.
50 min.
21±0.8
2±0.5
φ
1.5
φ
1.5
+0.1
0
+0.1
0
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