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COPAL ELECTRONICS
SM-3/31
SURFACE MOUNT TRIMMERS
■ LIST OF PART NUMBERS
〈 Nominal resistance values 〉
Electrical turns
Adjustment
position
Shape of terminal
Form of packaging
Taping (reel) Plastic bag
50 Ω
20 k Ω
100 Ω 200 Ω 500 Ω 1 k Ω 2 k Ω
50 k Ω 100 k Ω 200 k Ω 500 k Ω 1 M Ω
5 k Ω
2 M Ω
10 k Ω
Fig. 1
Top adjustment
W
(J-hook)
SM-3TW
SM-3W
※ The above part numbers are all available with the respective combination
11
Side adjustment
A
B
(J-hook)
(Gull wing)
SM-3TA
SM-3TB
SM-3A
SM-3B
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.
5
Top adjustment
W
A
(J-hook)
(J-hook)
SM-31TW
SM-31TA
SM-31W
SM-31A
Side adjustment
Pieces in package
B
(Gull wing)
SM-31TB
500 pcs./reel
SM-31B
50 pcs./pack
■ ELECTRICAL CHARACTERISTICS
■ MECHANICAL CHARACTERISTICS
Nominal resistance range
Resistance tolerance
Power ratings
Resistance law
Maximum input voltage
Maximum wiper current
Effective electrical turn
End resistance
50 Ω ~ 2 M Ω
± 20 %
0.125 W (70 °C) 0 W (150 °C)
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
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 [ Δ R/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
C.R.V.
Operating temp. range
Temp. coefficient
3 % or 3 Ω , whichever is greater
? 65 ~ 150 °C
± 100 10 -6 /°C maximum
{ } ： Reference only
■ ENVIRONMENTAL CHARACTERISTICS
Insulation resistance 100 M Ω minimum (DC500 V)
Dielectric strength AC600 V, 60 s
Net weight Approx. 0.10 g
Reflow profile for soldering heat evaluation 〉
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
[ Δ R/R ≦ 2 %]
[S.S. ≦ 2 %]
[ Δ R/R ≦ 3 %]
[ Δ R/R ≦ 1 %]
[S.S. ≦ 1 %]
° C
Peak : 250
(°C)
250
200
150
100
50
180 ° C
150 ° C
+5
0
Over 230 ° C
Pre Heating Zone
90 ± 30 s
30 ± 10 s
Soldering Zone
Heating time
Load life
Low temp. operation
High temp. exposure
Immersion seal
Soldering heat
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
[ 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 %]
Reflow : two times maximum
Δ R/R ： Change in total resistance
S.S. ： Setting stability
■ Specifications are subject to change without notice. Specifications in this catalog are for reference. The formal specification sheets will be submitted upon request.
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