SURFACE MOUNT CERMET TRIMMERS
SM-42/43
INTERNAL STRUCTURE
1
2
3
4
5
6
7
9
8
RoHS compliant
Part name
Material
Polyphenylenesulphide
Ceramic
Ag-Pd cermet
RuO
2
cermet
Flammability
UL94V-0
■
FEATURES
RoHS compliant
Fine adjustment is available
Automatic mounting is available (Taping)
Reflow soldering is available
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 - 4
□
T W 1 0 0
Ω
( 1 0 1 )
Series name
Electrical turn
2：11 turns
3：5 turns
Resistance code
Resistance value
Form of packaging
T：Taping (Reel)
Blank：Bulk in plastic bag
Product shape (Shape of terminal)
W, X：Top adjustmet
A, B：Side adjustmet
※Please
refer to the LIST OF PART NUMBERS when placing orders.
SM-42/43
SURFACE MOUNT TRIMMERS
■
LIST OF PART NUMBERS
Electrical turn
Adjustment
Shape of terminal
position
Form of packaging
Taping (reel)
Plastic bag
〈
Nominal resistance values
〉
A
10
Ω
A
20
Ω
50
Ω
100
Ω
200
Ω
500
Ω
1 kΩ
2 kΩ
2 MΩ
5 kΩ
10 kΩ
20 kΩ
50 kΩ 100 kΩ 200 kΩ 500 kΩ 1 MΩ
Fig. 1
W
(J-hook)
Top adjustment
SM-42TW
SM-42TX
SM-42TA
SM-42TB
SM-43TW
SM-43TX
SM-43TA
SM-43TB
TA, TB : 500 pcs./reel
TW, TX : 250 pcs./reel
SM-42W
SM-42X
SM-42A
SM-42B
SM-43W
SM-43X
SM-43A
SM-43B
50 pcs./pack
The products indicated by
A
mark are manufactured upon receipt of order basis.
※
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.
X
(Gull wing)
11
A
(J-hook)
Side adjustment
B
(Gull wing)
W
(J-hook)
Top adjustment
X
(Gull wing)
5
A
(J-hook)
Side adjustment
B
(Gull wing)
Pieces in package
■
MECHANICAL CHARACTERISTICS
Operating torque
Mechanical stop
Rotational life
17.6 mN·m {180 gf·cm} maximum
Clutch action
200 cycles [ΔR/R
≦
±
(3
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
■
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
10
Ω
~ 2 MΩ
±
10 %
0.25 W (85 °C) 0 W (150 °C)
（B）
Linear law
Thrust to shaft
Solderability
Shear (Adhesion)
Substrate bending
Pull-off strength
DC300 V or power rating, whichever is smaller
100 mA or power rating, whichever is smaller
11 turns (SM-42), 5 turns (SM-43)
1 % or 2
Ω,
whichever is greater
1 % or 3
Ω,
whichever is greater
−
65 ~ 150 °C
±100
10
-6
/°C maximum
100 MΩ minimum (DC500 V)
AC600 V, 60 s
Approx. 0.17 g
Load life
Low temp. operation
■
ENVIRONMENTAL CHARACTERISTICS
Test item
Thermal shock
Humidity
Shock
Vibration
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.
≦
1 %]
[ΔR/R
≦
2 %]
[ΔR/R
≦
1 %]
[S.S.
≦
1 %]
[ΔR/R
≦
3 % or 3
Ω]
[S.S.
≦
2 %]
[ΔR/R
≦
1 %]
[S.S.
≦
1 %]
[ΔR/R
≦
2 %]
[S.S.
≦
1 %]
No leaks (No continuous bubbles)
85 °C, 0.25 W, 1000 h
−65
°C, 2 h
150 °C, 250 h
85 °C, 60 s
Reflow profile for soldering heat evaluation
〉
(C)
250
Temperature
200
150
100
50
Peak : 250
+5
0
High temp. exposure
Immersion seal
C
Over 230 C
180 C
150 C
90 30 s
30 10 s
Heating time
Soldering Zone
Pre Heating Zone
Soldering heat
Reflow : Peak temperature 255 °C
(Please refer to the profile below.)
Manual soldering：350
±
10
°C, 3 ~ 4 s
[ΔR/R
≦
1 %]
ΔR/R：Change
in total resistance
S.S.
：Setting
stability
Reflow : two times maximum
SM-42/43
SURFACE MOUNT TRIMMERS
■
MAXIMUM INPUT RATINGS
Nominal resistance Resistance code Maximum input
values (Ω)
voltage (V)
A
A
10
20
50
100
200
500
1k
2k
5k
10 k
20 k
50 k
100 k
200 k
500 k
1M
2M
100
200
500
101
201
501
102
202
502
103
203
503
104
204
504
105
205
1.00
2.00
3.53
5.00
7.07
11.2
15.8
22.4
35.4
50.0
70.7
112
158
223
300
300
300
Maximum wiper
current (mA)
100
100
70.7
50.0
35.4
22.4
15.8
11.2
7.07
5.00
3.54
2.24
1.58
1.12
0.60
0.30
0.15
The products indicated by
A
mark are manufactured upon receipt of
order basis.
■
RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS
SM-42/43A
2
2
(Unit: mm)
SM-42/43B
1.3
2
SM-42/43W
SM-42/43X
2
1.9
1.6
2.9
0
1.6
2.54
2
5.2
0
0
0
2
1.3
1.3
2.3
2.3
1.3
2.54
Note) The zero point is the center of mounting.
1.9
1.3
1.3
5.1
4
SM-42/43
SURFACE MOUNT TRIMMERS
■
OUTLINE DIMENSIONS
SM-42/43W
3.9
3.5
1
Resistance code & Production date code
2
1.3
Unless otherwise specified, tolerance :
±
0.3 (Unit : mm)
1
2
※
Note the terminal position.
3
CW rotation
2.54
1.2
4.8
2 – 0.8
3
2.6
φ
1.5, Slot
0.56W
×
0.5D
5.1
5.3
3 – 0.9
3–1
SM-42/43X
5.7
3.5
Resistance code & Production date code
2
1.3
1
2.54
2 – 0.8
3
φ
1.5, Slot
0.56W
×
0.5D
1.2
5.1
5.3
3–1
SM-42/43A
Resistan ce code & Produ ction d ate code
②
①
3–1
2.3
2 – 0.9
1.2
1.3
0.56W
×
0.5D
2.6
3.7
3 – 0.8
φ
1.5, Slot
③
4.6
5
SM-42/43B
Resistance code & Production date code
2
1
3.9
4.8
4.8
2.3
1.3
4.8
2 – 0.9
φ
1.5, Slot
2.8
0.56W
×
0.5D
4.6
6
1.2
3
3 – 0.6
SM-42/43
SURFACE MOUNT TRIMMERS
■
PACKAGING SPECIFICATIONS
<Taping packaging specifications>
Taping version (SM-42/43TA, TB) is packaged in 500
pcs. per reel.
Orders will be accepted for units of 500 pcs., i.e., 500,
1000, 1500 pcs., etc.
SM-42/43TW, TX is packaged in 250 pcs. per reel.
Orders will be accepted for units of 250 pcs., i.e., 500,
750 pcs., etc.
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）
（TA/TB
type : In accordance with EIAJ ET-7200A）
Empty
Filled
Empty
+1
(Unit: mm)
13
0
(TA/TB)
17±0.3 (TW, TX)
21±0.8
2±0.5
End
Head
400 mm min.
13±0.2
180
–1.5
(TA/TB)
0
180
–3
(TW, TX)
0
15.4±1 (TA/TB)
19.5±1 (TW/TX)
SM-42/43TW/TX
4 0.1
1.75 0.1
2 0.1
.
φ
1
5
.1
+0 0
SM-42/43TA/TB
2 0.1
3
A
1.75 0.1
0.5 0.1
Installation
example
(SM-42W)
4 0.1
0.4 0.1
Installation
example
(SM-42A)
12
A
3
1
7.5 0.1
5.5 0.05
16
+0.3
–0.1
60
φ
5
1.
.1
+0 0
Direction of feed
+1
0
40 mm min.
20 pitches min.
2
A
1
12 0.1
5.75
Cross section A-A
2
A
8 0.1
4.5
Cross section A-A
<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.
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