SM-3/31
SURFACE MOUNT CERMET TRIMMERS
● RoHS compliant
● Fine adjustment is possible
● Automatic mounting is possible (Taping)
● 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
Rotor gear
Shaft
Terminal pin
Electrode
Base element
Resistive element
Housing
Adhesive
Wiper
Polyphenylenesulphide
Copper alloy, Sn-Cu-plated
Brass, Nickel-plated
Ag-Pd cermet
UL94V-0
Ceramic
—
UL94V-0
—
RuO2 cermet
Polyamide
INTERNAL STRUCTURE
■
PART NUMBER DESIGNATION
※Please refer to the LIST OF PART NUMBERS when placing orders.
S M - 3
□
T W 1 k Ω ( 1 0 2 )
Series name
Form of packaging
T：Taping (Reel)
Blank：Bulk in plastic bag
Electrical turn
Blank：11 turns
1：5 turns
Resistance code
Resistance value
Product shape (Shape of terminal)
A, W：J-hook
B：Gull wing
1
2
3
4
5
67
8
9
Epoxy
Multi metal alloy
RoHS compliant
11
5
Top adjustment
Side adjustment
Top adjustment
Side adjustment
Pieces in package
Electrical turns Adjustment
position Shape of terminal
Form of packaging
Taping (reel) Plastic bag
■
LIST OF PART NUMBERS
W
A
B
(J-hook)
(J-hook)
W
A
B
(J-hook)
(J-hook)
(Gull wing)
(Gull wing)
SM-3TW SM-3W
SM-3TA SM-3A
SM-3TB SM-3B
SM-31TW SM-31W
SM-31TA SM-31A
SM-31TB SM-31B
500 pcs./reel 50 pcs./pack
〈
Nominal resistance values
〉
■
ELECTRICAL CHARACTERISTICS
■
MECHANICAL CHARACTERISTICS
■
ENVIRONMENTAL CHARACTERISTICS
50 Ω 100 Ω 200 Ω 500 Ω 1 k Ω 2 k Ω 5 k Ω 10 k Ω
20 kΩ 50 kΩ
100 kΩ
200 kΩ
500 kΩ
1 MΩ 2 MΩFig. 1
※ 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.
SM-3/31
SURFACE MOUNT TRIMMERS
〈
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
Soldering heat [ ΔR/R ≦ 1 %]
Reflow : Peak temperature 255 °C
(Please refer to the profile below.)
Manual soldering：350 ± 10 °C, 3 ~ 4 s
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
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 M Ω
± 20 %
0.125 W (70 °C) 0 W (150 °C)
（B）
Linear law
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 M Ω minimum (DC500 V)
AC600 V, 60 s
Approx. 0.10 g
Test item Test conditions Specifications
Thermal shock
Humidity
Shock
Vibration
Load life
Low temp. operation
High temp. exposure
Immersion seal
ΔR/R：Change in total resistance
S.S. ：Setting stability
−65 ~ 150 °C (0.5 h), 5 cycles [ΔR/R ≦ 2 %]
[S.S. ≦ 2 %]
−10 ~ 65 °C (80 ~ 98 %),
10 cycles, 240 h
[ΔR/R ≦ 3 %]
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, 0.125 W, 1000 h [ΔR/R ≦ 3 %]
[S.S. ≦ 2 %]
−65 °C, 2 h [ΔR/R ≦ 2 %]
[S.S. ≦ 2 %]
150 °C, 250 h [ΔR/R ≦ 3 %]
[S.S. ≦ 2 %]
85 °C, 60 s
No leaks
(No continuous bubbles)
1.3
1.3
1.6
2.43
2.8 0.9
1.3
1.6
1.6
3.12
2.8
00
0.9
1.3
1.6
1.6
4
2.8
0
0.9
1.3
2
2
4.4
2.8
0
0.9
SM-3/31
SURFACE MOUNT TRIMMERS
■
MAXIMUM INPUT RATINGS
■
RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS
Nominal resistance values ( Ω)
Resistance code Maximum input voltage (V)
Maximum wiper current (mA)
50 500 2.50 50.0
100 101 3.53 35.4
200 201 5.00 25.0
500 501 7.91 15.8
1 k 102 11.2 11.2
2 k 202 15.8 7.91
5 k 502 25.0 5.00
10 k 103 35.4 3.54
20 k 203 50.0 2.50
50 k 503 79.1 1.58
100 k 104 112 1.12
200 k 204 158 0.79
500 k 504 200 0.40
1 M 105 200 0.20
2 M 205 200 0.10
(Unit : mm)
● SM-3W/31W ● SM-3A/31A ● SM-3B/31B
Note) The zero point is the center of mounting.
※
Also available to place as the
above.
● SM-3W/31W
Top adjustment
1
2
3
2.3
3.2
3.9
0.4W × 1.3L × 0.3D
0.8
0.8
4.2
3.5
Resistance code & Production date code
2.8
0.6
1
3.9
CW rotation
1
2
3
※
Note the terminal position.
■
OUTLINE DIMENSIONS Unless otherwise specified, tolerance : ± 0.3 (Unit : mm)
ΔR/R：Change in total resistance
S.S. ：Setting stability
SM-3/31
SURFACE MOUNT TRIMMERS
● SM-3A/31A
Side adjustment
1
2
3
2.5
3.9
0.4W × 1.3L × 0.3D
3 – 0.8
3.4
3 – 0.8
4.4
Resistance code &
Production date code
2.8
2 – 0.6
1
3.9
● SM-3B/31B
Side adjustment
1
2
3
2.5
3.9
0.4W × 1.3L × 0.3D
3.4
5.3
Resistance code &
Production date code
2.8
2 – 0.6
1
3.9
CW rotation
1
2
3
※
Note the terminal position.
■
OUTLINE DIMENSIONS Unless otherwise specified, tolerance : ± 0.3 (Unit : mm)
■
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.
● REEL DIMENSIONS
（Conforms to JIS C 0806-3）
（In accordance with EIAJ ET-7200A）
(Unit: mm)
● EMBOSSED TAPE DIMENSIONS
Empty Filled Empty
40 mm min. 20 pitches min.
400 mm min.
Direction of feed
HeadEnd
Leader
60 +1
0
180 15.4±1
21±0.8
13±0.2
2±0.5
13 +1
0
0
–1.5
4 ± 0.1
0.4 ± 0.1
1.75 ± 0.1
12 +0.3
–0.1
5.5 ± 0.05
4.7
Installation example
(SM-3W)
Cross section A-A
A
A
8 ± 0.1
3
21
1.5
φ
+0.1
0
2 ± 0.05
SM-3/31
SURFACE MOUNT TRIMMERS
● SM-3TW/31TW
4 ± 0.1 0.4 ± 0.1
(SM-3A)
3.9
2 ± 0.05
8 ± 0.1
1.75 ± 0.1
5.5 ± 0.05
12 +0.3
–0.1
A
φ
1.5 +0.1
0
A3
1
2Cross section A-A
Installation example
● SM-3TA/31TA
4 ± 0.1 0.4 ± 0.1
(SM-3B)
Installation example
3.9
2 ± 0.05
8 ± 0.1
1.75 ± 0.1
5.5 ± 0.05
12 +0.3
–0.1
A
φ
1.5 +0.1
0
A3
1
2Cross section A-A
● SM-3TB/31TB
<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.
