SURFACE MOUNT CERMET TRIMMERS
RoHS compliant
SM-3/31
INTERNAL STRUCTURE
①
⑨
②
③
④
⑤
⑧
⑦
⑥
Part name
■ FEATURES
●
●
●
●
●
●
RoHS compliant
Fine adjustment is possible
Automatic mounting is possible (Taping)
Reflow soldering is possible
Sealed construction (Washable: Refer to page 698.)
Resin material is UL Recognized 94V-0
Material
①
Housing
②
Base element
③
Electrode
Ag-Pd cermet
④
Resistive element
RuO2 cermet
⑤
Adhesive
⑥
Wiper
⑦
Terminal pin
⑧
Rotor gear
⑨
Shaft
Polyphenylenesulphide
Ceramic
Epoxy
Multi metal alloy
Copper alloy, Sn-Cu-plated
Polyamide
Brass, Nickel-plated
■ PART NUMBER DESIGNATION
S M - 3 □ T W 1 kΩ ( 1 0 2 )
Series name
Resistance code
Electrical turn
Resistance value
Blank:11 turns
1:5 turns
Form of packaging
T:Taping (Reel)
Blank:Bulk in plastic bag
※ Please refer to the LIST OF PART NUMBERS when placing orders.
Product shape (Shape of terminal)
A:J-hook (Side adjustment)
B:Gull wing(Side adjustment)
W:J-hook (Top adjustment)
SM-3/31
SURFACE MOUNT TRIMMERS
■ LIST OF PART NUMBERS
Adjustment
position
Electrical turns
〈Nominal resistance values〉
Top adjustment
11
Side adjustment
Top adjustment
5
Side adjustment
Taping (reel)
Plastic bag
W
(J-hook)
SM-3TW
SM-3W
A
(J-hook)
SM-3TA
SM-3A
B
(Gull wing) SM-3TB
SM-3B
W
(J-hook)
SM-31TW
SM-31W
A
(J-hook)
SM-31TA
SM-31A
B
(Gull wing) SM-31TB
SM-31B
500 pcs./reel
Pieces in package
100 Ω
2 kΩ
5 kΩ
50 kΩ 100 kΩ 200 kΩ 500 kΩ 1 MΩ
200 Ω
500 Ω
1 kΩ
2 MΩ
10 kΩ
■ MECHANICAL CHARACTERISTICS
50 Ω ~ 2 MΩ
Operating torque
5 mN·m {51 gf·cm} maximum
± 20 %
Mechanical stop
Clutch action
Resistance tolerance
Fig. 1
※ The above part numbers are all available with the respective combination
of (Fig. 1).
※ Verify the above part numbers when placing orders.
※ Taping specification is not sold separately and must be purchased in reel units.
50 pcs./pack
■ ELECTRICAL CHARACTERISTICS
Nominal resistance range
50 Ω
20 kΩ
Form of packaging
Shape of terminal
Power ratings
0.125 W (70 °C) 0 W (150 °C)
Rotational life
200 cycles [ Δ R/R ≦ ± (2 Ω +3 %)]
Resistance law
Linear law
Thrust to shaft
5 N {0.51 kgf} minimum
Maximum input voltage
DC200 V or power rating, whichever is smaller
Solderability
245 ± 3 °C, 2 ~ 3 s
Maximum wiper current
100 mA or power rating, whichever is smaller
Shear (Adhesion)
5 N {0.51 kgf} 10 s
Effective electrical turn
11 turns (SM-3) / 5 turns (SM-31)
Substrate bending
Width 90 mm, bend 3 mm, 5 s, 1 time
End resistance
1 % or 3 Ω, whichever is greater
C.R.V.
3 % or 3 Ω, whichever is greater
Operating temp. range
Temp. coefficient
Insulation resistance
± 100 10-6/°C maximum
100 MΩ minimum (DC500 V)
AC600 V, 60 s
Net weight
Approx. 0.10 g
Temperature
〈Reflow profile for soldering heat evaluation〉
(℃)
250
Peak : 250 0 ℃
200
Pre Heating Zone
100
50
+5
Over 230 ℃
180 ℃
150 ℃
5 N {0.51 kgf} 10 s
{ }:Reference only
− 65 ~ 150 °C
Dielectric strength
150
Pull-off strength
90±30 s
30±10 s
Heating time
Soldering Zone
Reflow : two times maximum
■ ENVIRONMENTAL CHARACTERISTICS
Test item
Test conditions
Specifications
Thermal shock
− 65 ~ 150 °C (0.5 h), 5
cycles
[ Δ R/R ≦ 2 %]
[S.S. ≦ 2 %]
Humidity
Shock
− 10 ~ 65 °C (80 ~ 98 %),
10 cycles, 240 h
981 m/s2, 6 ms
6 directions for 3 times each
Vibration
(Amplitude) 1.52 mm or
(Acceleration) 196 m/s2,
10 ~ 2000 Hz, 3 directions, 12 times each
Load life
70 °C, 0.125 W, 1000 h
Low temp. operation
− 65 °C, 2 h
High temp. exposure
150 °C, 250 h
Immersion seal
85 °C, 60 s
Reflow : Peak temperature 255 °C
Soldering heat (Please refer to the profile below.)
Manual soldering:350 ± 10 °C, 3 ~ 4 s
[ Δ R/R ≦ 3 %]
[ Δ R/R ≦ 1 %]
[S.S. ≦ 1 %]
[ Δ R/R ≦ 3 %]
[S.S. ≦ 2 %]
[ Δ R/R ≦ 2 %]
[S.S. ≦ 2 %]
[ Δ R/R ≦ 3 %]
[S.S. ≦ 2 %]
No leaks (No continuous bubbles)
[ Δ R/R ≦ 1 %]
Δ R/R:Change in total resistance
S.S. :Setting stability
SM-3/31
SURFACE MOUNT TRIMMERS
■ MAXIMUM INPUT RATINGS
Nominal resistance values
(Ω)
Resistance code
Maximum input voltage
(V)
Maximum wiper current
(mA)
50
100
200
500
500
101
201
501
2.50
3.53
5.00
7.91
50.0
35.4
25.0
15.8
1 k
2 k
5 k
10 k
20 k
50 k
102
202
502
103
203
503
11.2
15.8
25.0
35.4
50.0
79.1
11.2
7.91
5.00
3.54
2.50
1.58
100 k
200 k
500 k
1 M
2 M
104
204
504
105
205
112
158
200
200
200
1.12
0.79
0.40
0.20
0.10
■ RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS
● SM-3W/31W
● SM-3A/31A
● SM-3B/31B
(Unit : mm)
1.3
1.3
1.3
4
0
0
0
1.6
1.6
1.6
0
4.4
1.3
2.43
3.12
1.6
1.6
2
1.3
2.8
0.9
2.8
2
0.9
0.9
2.8
※ Also available to place as the above.
0.9
2.8
Note) The zero point is the center of mounting.
■ OUTLINE DIMENSIONS
Unless otherwise specified, tolerance : ± 0.3 (Unit : mm)
● SM-3W/31W
Top adjustment
①
③
CW rotation
②
Resistance code & Production date code
①
0.8
③
1
2.3
3.2
3.5
3.9
0.6
2.8
②
3.9
4.2
0.4W × 1.3L × 0.3D
0.8
Note the terminal position.
SM-3/31
SURFACE MOUNT TRIMMERS
■ OUTLINE DIMENSIONS
Unless otherwise specified, tolerance : ± 0.3 (Unit : mm)
● SM-3A/31A
Side adjustment
● SM-3B/31B
Side adjustment
①
③
CW rotation
Resistance code &
Production date code
②
Resistance code &
Production date code
2.5
2.5
Note the terminal position.
0.4W × 1.3L × 0.3D
0.4W × 1.3L × 0.3D
3.9
③
3.9
1
2.8
5.3
3 – 0.8
2 – 0.6
①
3.4
②
3.9
3.4
3 – 0.8
②
3.9
4.4
1
③
2 – 0.6
2.8
①
■ 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
(Unit: mm)
Empty
13
Head
21±0.8
2±0.5
20 pitches min.
60
40 mm min.
Leader
Direction of feed
+1
0
End
+1
0
400 mm min.
13±0.2
0
180 –1.5
15.4±1
SM-3/31
SURFACE MOUNT TRIMMERS
● SM-3TW/31TW
4±0.1
Φ
③
A
.1
+0 0
5
1.
1.75±0.1
2±0.05
0.4±0.1
A
②
8±0.1
+0.3
12 –0.1
5.5±0.05
Installation example
(SM-3W)
①
Cross section A-A
4.7
Installation example
(SM-3A)
5.5±0.05
①
0.4±0.1
+0.3
③
12 –0.1
.1
+0 0
5
1.
Φ
4±0.1
2±0.05
A
1.75±0.1
● SM-3TA/31TA
A
②
3.9
8±0.1
Cross section A-A
.1
+0 0
5
1.
Φ
4±0.1
2±0.05
A
③
1.75±0.1
● SM-3TB/31TB
0.4±0.1
Installation example
(SM-3B)
A
②
8±0.1
● 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.
+0.3
12 –0.1
5.5±0.05
①
3.9
Cross section A-A
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