■ Specifications are subject to change without notice. Specifications in this catalog are for reference. The formal specification sheets will be submitted upon request.

COPAL ELECTRONICS

Nominal resistance range

ST-4

SURFACE MOUNT TRIMMERS

※ 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.

※ Cross slot available : ST-42E

¤

■

LIST OF PART NUMBERS

Adjustment

position

Top

adjustment

Rear

adjustment

Side

adjustment

Pieces in package

Shape of terminal

Form of packaging

Taping (reel)

ST-4/42ETA

ST-4/42EA

ST-4/42ETB

ST-4/42EB

ST-4/42EC

A ST-4/42ETD

A ST-4/42ED

A ST-4/42EF

ST-4/42ETG

ST-4/42EG

ST-4/42ETH

ST-4/42EH

Plastic bag

500 pcs./reel

100 pcs./pack

The products indicated by

A mark are manufactured upon receipt of order basis.

※

C slot : ST-4E□, B slot : ST-42E□

〈

2 k

Ω

5 k

Ω

10 k

Ω 20 kΩ 50 kΩ 100 kΩ 200 kΩ 500 kΩ 1 MΩ 2 MΩ

：Change in total resistance

S.S.

：Setting stability

■

ELECTRICAL CHARACTERISTICS

■

MECHANICAL CHARACTERISTICS

10

Ω ~ 2 MΩ

± 20 %

0.25 W (70 °C) 0 W (125 °C)

Linear law (B)

DC200 V or power rating, whichever is smaller

100 mA or power rating, whichever is smaller

210° (1 turn)

1 % or 2

Ω, whichever is greater

1 % or 3

Ω, whichever is greater

−55 ~ 125 °C

10

100

1000 M

Ω minimum (DC500 V)

AC500 V, 60 s

Approx. 0.12 g (ST-4EA, EB, EC, ED, EF)

Approx. 0.22 g (ST-4EG, EH)

Resistance tolerance

Power ratings

Resistance law

Maximum input voltage

Maximum wiper current

Effective electrical angle

End resistance

C.R.V.

Operating temp. range

Temp. coefficient

Insulation resistance

Dielectric strength

Net weight

Mechanical angle

240° (1 turn)

10 mN·m {102 gf·cm} maximum

30 mN·m {306 gf·cm} minimum

100 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

Operating torque

Stop strength

Rotational life

Thrust to rotor

Solderability

Shear (Adhesion)

Substrate bending

Pull-off strength

■

ENVIRONMENTAL CHARACTERISTICS

Test item

Test conditions

Specifications

Thermal shock

−65 ~ 125 °C (0.5 h), 5 cycles

[ΔR/R

≦ 2 %]

[S.S.

≦ 1 %]

Humidity

−10 ~ 65 °C (80 ~ 98 %),

10 cycles, 240 h

[ΔR/R

≦ 2 %]

Shock

981 m/s

6 directions for 3 times each

[ΔR/R

≦ 1 %]

[S.S.

≦ 1 %]

Vibration

Amplitude 1.52 mm or

Acceleration 196 m/s

10 ~ 2000 Hz, 3 directions, 12 times each

Load life

70 °C, 0.25 W 1000 h

[ΔR/R

≦ 3 %]

[S.S.

≦ 1 %]

Low temp. operation

−55 °C, 2 h

[ΔR/R

≦ 2 %]

[S.S.

≦ 2 %]

High temp. exposure

125 °C, 250 h

[ΔR/R

≦ 3 %]

[S.S.

≦ 2 %]

Immersion seal

85 °C, 60 s

No leaks (No continuous bubbles)

Soldering heat

[ΔR/R

≦ 1 %]

Fig. 1

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

Flow : 260

± 3 °C as the temperature in a pot of

molten solder, immersion from head of terminal to

backside of board, 5 ~ 6 s, two times maximum

Reflow : Peak temperature 255 °C

(Please refer to the profile below.)

Manual soldering

：350

± 10 °C, 3 ~ 4 s