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

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

50

Ω 100 Ω 200 Ω 500 Ω 1 kΩ

2 k

Ω

5 k

Ω 10 kΩ

20 k

Ω 50 kΩ 100 kΩ 200 kΩ 500 kΩ 1 MΩ 2 MΩ

Fig. 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 : two times maximum

Peak : 250

Over 230 C

Pre Heating Zone

180 C

(C)

250

200

150

100

50

150 C

90 30 s

30 10 s

Soldering Zone

Heating time

C

+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

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 MΩ

± 20 %

0.125 W (70 °C) 0 W (150 °C)

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 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/s

6 directions for 3 times each

[

ΔR/R ≦ 1 %]

[S.S.

≦ 1 %]

(Amplitude) 1.52 mm or

(Acceleration) 196 m/s

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)