SM-42/43
● RoHS compliant
● Fine adjustment is available
● Automatic mounting is available (Taping)
● Reflow soldering is available
● 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
Ag-Pd cermet
UL94V-0
Ceramic
—
RuO2 cermet
UL94V-0
—
INTERNAL STRUCTURE
■
PART NUMBER DESIGNATION
※Please refer to the LIST OF PART NUMBERS when placing orders.
S M - 4 □ T W 1 0 0 Ω ( 1 0 1 )
Series name
Electrical turn
2：11 turns
3：5 turns
Form of packaging
T：Taping (Reel)
Blank：Bulk in plastic bag
Resistance code
Resistance value
Product shape (Shape of terminal)
W, X：Top adjustmet
A, B：Side adjustmet
Epoxy
Multi metal alloy
Copper alloy, Sn-Cu-plated
Polyamide
Brass, Nickel-plated
RoHS compliant
1
2
3
4
5
6
9
8
7
SURFACE MOUNT CERMET TRIMMERS
Top adjustment
11
5
Side adjustment
Top adjustment
Side adjustment
Pieces in package
Adjustment
position
Electrical turn
Shape of terminal
Form of packaging
Taping (reel) Plastic bag
■
LIST OF PART NUMBERS
W(J-hook)
A
B
SM-42TW SM-42W
SM-42TX SM-42X
SM-42TA SM-42A
SM-42TB SM-42B
SM-43TW SM-43W
SM-43TX SM-43X
SM-43TA SM-43A
SM-43TB SM-43B
TA, TB : 500 pcs./reel
TW, TX : 250 pcs./reel
50 pcs./pack
〈
Nominal resistance values
〉
■
ELECTRICAL CHARACTERISTICS
■
MECHANICAL CHARACTERISTICS
■
ENVIRONMENTAL CHARACTERISTICS
A10 Ω A20 Ω 50 Ω 100 Ω 200 Ω 500 Ω 1 k Ω 2 k Ω 5 k Ω
10 k Ω 20 k Ω 50 k Ω 100 k Ω 200 k Ω 500 k Ω 1 M Ω 2 M ΩFig. 1
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.
SM-42/43
SURFACE MOUNT TRIMMERS
X(Gull wing)
（Jリード）
(J-hook)
(Gull wing)
W(J-hook)
A
B
X(Gull wing)
(J-hook)
(Gull wing)
〈
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
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
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 M Ω
± 10 %
0.25 W (85 °C) 0 W (150 °C)
Linear law
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 M Ω minimum (DC500 V)
AC600 V, 60 s
Approx. 0.17 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. ≦ 1 %]
−10 ~ 65 °C (80 ~ 98 %),
10 cycles, 240 h
[ΔR/R ≦ 2 %]
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
85 °C, 0.25 W, 1000 h [ΔR/R ≦ 3 % or 3 Ω]
[S.S. ≦ 2 %]
−65 °C, 2 h [ΔR/R ≦ 1 %]
[S.S. ≦ 1 %]
150 °C, 250 h [ΔR/R ≦ 2 %]
[S.S. ≦ 1 %]
85 °C, 60 s
No leaks
(No continuous bubbles)
W, X：Top adjustmet
A, B：Side adjustmet
2
00
00
2
2
2
2.3 2.3
2.54
2.54
1.3 1.3
1.3
1.3
4
2
1.3
1.6
1.9
5.2
2.9
5.1
2
1.3
1.6
1.9
Nominal resistance
values ( Ω)
Resistance code Maximum input
voltage (V)
Maximum wiper
current (mA)
■
MAXIMUM INPUT RATINGS
A 10 100 1.00 100
A 20 200 2.00 100
50 500 3.53 70.7
100 101 5.00 50.0
200 201 7.07 35.4
500 501 11.2 22.4
1 k 102 15.8 15.8
2 k 202 22.4 11.2
5 k 502 35.4 7.07
10 k 103 50.0 5.00
20 k 203 70.7 3.54
50 k 503 112 2.24
100 k 104 158 1.58
200 k 204 223 1.12
500 k 504 300 0.60
1 M 105 300 0.30
2 M 205 300 0.15
■
RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS (Unit: mm)
● SM-42/43A ● SM-42/43B ● SM-42/43W ● SM-42/43X
Note) The zero point is the center of mounting.
The products indicated by A mark are manufactured upon receipt of
order basis.
SM-42/43
SURFACE MOUNT TRIMMERS
2.54
1
3
2
2 – 0.8
2.6
3.5
3.9
Resistance code & Production date code
1.3
1.2
4.8
3 – 1
5.1
5.3
3 – 0.9
0.56W × 0.5D
φ
1.5, Slot
2.54
1
3
2
2 – 0.8
3.5
5.7
1.3
1.2
4.8
3 – 1
5.1
5.3
0.56W × 0.5D
Resistance code & Production date code
φ
1.5, Slot
2.3
①
③
②
2 – 0.9
2.6
3.7
Resistan ce code & Produ ction d ate code
1.3
1.2
4.8
3 – 1
4.6
5
3 – 0.8
0.56W × 0.5D
φ
1.5, Slot
2.3
1
3
2
2 – 0.9
2.8
3.9
Resistance code & Production date code
1.3
1.2
4.8
3 – 0.6
4.6
6
0.56W × 0.5D
φ
1.5, Slot
SM-42/43
SURFACE MOUNT TRIMMERS
● SM-42/43W
● SM-42/43X
● SM-42/43A
● SM-42/43B
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 (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.
● EMBOSSED TAPE DIMENSIONS ● REEL DIMENSIONS
（Conforms to JIS C 0806-3）
（TA/TB type : In accordance with EIAJ ET-7200A）
(Unit: mm)
Empty Filled Empty
40 mm min. 20 pitches min.
400 mm min.
Direction of feed
HeadEnd
Leader
60 +1
0
180
180 (TA/TB) 15.4±1 (TA/TB)
19.5±1 (TW/TX)
21±0.8
13±0.2
2±0.5
17±0.3 (TW, TX)
13 (TA/TB)
+1
0
0
–1.5
(TW, TX)
0
–3
● SM-42/43TW/TX ● SM-42/43TA/TB
4 ± 0.1
0.5 ± 0.1
5.75
Cross section A-A
Installation example
(SM-42W)
1.5
φ
+0.1
0
2 ± 0.1
3
1
2
12 ± 0.1
7.5 ± 0.1
16 +0.3
–0.1
1.75 ± 0.1
A
A
4 ± 0.1
φ
1.5 +0.1
0
2 ± 0.1
8 ± 0.1
0.4 ± 0.1
4.5
5.5 ± 0.05
1.75 ± 0.1
12
3
1
2
A
A
(SM-42A)
Cross section A-A
Installation example
<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.
SM-42/43
SURFACE MOUNT TRIMMERS
