SURFACE MOUNT CERMET TRIMMERS
SM-3/31
INTERNAL STRUCTURE
1
2
3
4
5
6
9
8
RoHS compliant
7
Part name
Material
Polyphenylenesulphide
Ceramic
Ag-Pd cermet
RuO
2
cermet
Flammability
UL94V-0
■
FEATURES
RoHS compliant
Fine adjustment is possible
Automatic mounting is possible (Taping)
Reflow soldering is possible
Sealed construction (Washable: Refer to page 750.)
1
2
3
4
5
6
7
8
9
Housing
Base element
Electrode
Resistive element
Adhesive
Wiper
Terminal pin
Rotor gear
Shaft
—
Epoxy
Multi metal alloy
Copper alloy, Sn-Cu-plated
Polyamide
Brass, Nickel-plated
UL94V-0
—
■
PART NUMBER DESIGNATION
S M - 3
□
T W 1 k
Ω
( 1 0 2 )
Series name
Electrical turn
Blank：11 turns
1：5 turns
Resistance code
Resistance value
Product shape (Shape of terminal)
A, W：J-hook
B：Gull wing
Form of packaging
T：Taping (Reel)
Blank：Bulk in plastic bag
※Please
refer to the LIST OF PART NUMBERS when placing orders.
SM-3/31
SURFACE MOUNT TRIMMERS
■
LIST OF PART NUMBERS
Electrical turns
Adjustment
position
Top adjustment
11
Side adjustment
Form of packaging
Shape of terminal
Taping (reel)
Plastic bag
〈
Nominal resistance values
〉
50
Ω
20 kΩ
100
Ω
200
Ω
500
Ω
1 kΩ
2 kΩ
5 kΩ
2 MΩ
10 kΩ
50 kΩ 100 kΩ 200 kΩ 500 kΩ 1 MΩ
Fig. 1
W
A
B
(J-hook)
(J-hook)
(Gull wing)
(J-hook)
(J-hook)
(Gull wing)
SM-3TW
SM-3TA
SM-3TB
SM-31TW
SM-31TA
SM-31TB
SM-3W
SM-3A
SM-3B
SM-31W
SM-31A
SM-31B
※
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.
Top adjustment
5
Side adjustment
W
A
B
Pieces in package
500 pcs./reel
50 pcs./pack
■
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
~ 2 MΩ
±
20 %
0.125 W (70 °C) 0 W (150 °C)
（B）
Linear law
■
MECHANICAL CHARACTERISTICS
Operating torque
Mechanical stop
Rotational life
Thrust to shaft
Solderability
Shear (Adhesion)
Substrate bending
Pull-off strength
5 mN·m {51 gf·cm} maximum
Clutch action
200 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
DC200 V or power rating, whichever is smaller
100 mA or power rating, whichever is smaller
11 turns (SM-3) / 5 turns (SM-31)
1 % or 3
Ω,
whichever is greater
3 % or 3
Ω,
whichever is greater
−
65 ~ 150 °C
±100
10
-6
/°C maximum
100 MΩ minimum (DC500 V)
AC600 V, 60 s
Approx. 0.10 g
■
ENVIRONMENTAL CHARACTERISTICS
Test item
Thermal shock
Humidity
Shock
Test conditions
−65
~ 150 °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
Specifications
[ΔR/R
≦
2 %]
[S.S.
≦
2 %]
[ΔR/R
≦
3 %]
[ΔR/R
≦
1 %]
[S.S.
≦
1 %]
[ΔR/R
≦
3 %]
[S.S.
≦
2 %]
[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
Vibration
Load life
Low temp. operation
High temp. exposure
C
70 °C, 0.125 W, 1000 h
−65
°C, 2 h
150 °C, 250 h
85 °C, 60 s
Reflow : Peak temperature 255 °C
(Please refer to the profile below.)
Manual soldering：350
±
10 °C, 3 ~ 4 s
Over 230 C
180 C
150 C
90 30 s
30 10 s
Pre Heating Zone
Immersion seal
Soldering heat
[ΔR/R
≦
1 %]
Heating time
Soldering Zone
Reflow : two times maximum
ΔR/R：Change
in total resistance
S.S.
：Setting
stability
SM-3/31
SURFACE MOUNT TRIMMERS
■
MAXIMUM INPUT RATINGS
Nominal resistance values (Ω)
50
100
200
500
1k
2k
5k
10 k
20 k
50 k
100 k
200 k
500 k
1M
2M
Resistance code
500
101
201
501
102
202
502
103
203
503
104
204
504
105
205
Maximum input voltage (V)
2.50
3.53
5.00
7.91
11.2
15.8
25.0
35.4
50.0
79.1
112
158
200
200
200
Maximum wiper current (mA)
50.0
35.4
25.0
15.8
11.2
7.91
5.00
3.54
2.50
1.58
1.12
0.79
0.40
0.20
0.10
■
RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS
SM-3W/31W
1.3
1.3
1.6
1.6
2
4.4
0
2.8
0.9
SM-3A/31A
1.3
SM-3B/31B
1.3
(Unit : mm)
3.12
2.43
1.3
0
1.6
4
0
1.6
0
1.6
2.8
0.9
2.8
0.9
0.9
2.8
※
Also available to place as the above.
Note) The zero point is the center of mounting.
■
OUTLINE DIMENSIONS
SM-3W/31W
Top adjustment
Resistance code & Production date code
Unless otherwise specified, tolerance :
±
0.3 (Unit : mm)
1
2
0.8
※
Note the terminal position.
3
CW rotation
1
2
2.8
3.9
1
0.6
3
2.3
3.2
3.5
3.9
4.2
0.4W
×
1.3L
×
0.3D
0.8
2
SM-3/31
SURFACE MOUNT TRIMMERS
■
OUTLINE DIMENSIONS
SM-3A/31A
Side adjustment
Resistance code &
Production date code
2.5
Unless otherwise specified, tolerance :
±
0.3 (Unit : mm)
SM-3B/31B
Side adjustment
Resistance code &
Production date code
2.5
1
2
3
CW rotation
※
Note the terminal position.
0.4W
×
1.3L
×
0.3D
3.9
1
2
0.4W
×
1.3L
×
0.3D
3.4
3 – 0.8
3 – 0.8
3.9
1
2
3.4
4.4
3.9
5.3
2 – 0.6
2.8
1
3
3
3.9
2 – 0.6
2.8
1
■
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.
Maximum number of consecutive missing pieces = 2
Leader length and reel dimension are shown in the dia-
grams below.
EMBOSSED TAPE DIMENSIONS
REEL DIMENSIONS
（Conforms
to JIS C 0806-3）
（In
accordance with EIAJ ET-7200A）
Empty
Filled
Empty
(Unit: mm)
13
21±0.8
2±0.5
+1
0
End
Head
Direction of feed
400 mm min.
13±0.2
180
–1.5
0
15.4±1
60
+1
0
40 mm min.
20 pitches min.
SM-3/31
SURFACE MOUNT TRIMMERS
SM-3TW/31TW
4 0.1
1.75 0.1
2 0.05
φ
5
1.
.1
+0 0
0.4 0.1
Installation example
(SM-3W)
A
3
5.5 0.05
2
A
8 0.1
1
12
+0.3
–0.1
4.7
Cross section A-A
SM-3TA/31TA
4 0.1
2 0.05
A
1.75 0.1
0.4 0.1
Installation example
(SM-3A)
1
5.5 0.05
A
2
8 0.1
12
–0.1
+0.3
φ
5
1.
.1
+0 0
3
3.9
Cross section A-A
SM-3TB/31TB
4 0.1
2 0.05
A
1.75 0.1
0.4 0.1
Installation example
(SM-3B)
1
5.5 0.05
A
2
8 0.1
12
–0.1
+0.3
<Bulk pack 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.
φ
1.
5
.1
+0 0
3
3.9
Cross section A-A
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