Document Number: 58008 For technical questions contact: copalsupport@vishay.com www.vishay.com
Revision: 13-Jul-05 4
SM-4
Surface Mount Cermet Trimmers (12 Turns) Vishay
MECHANICAL SPECIFICATIONS
Mechanical turn 12 turns
Operating torque 20 mN m {204 gf cm} maximum
Mechanical stop Clutch action
Rotational life 200 cycles [∆ R/R ≤ ± (3 Ω + 3 %)]
Thrust to shaft 5 N {0.51 kgf} minimum
Solderability Sn-Pb: 235 °C, 2 s
Sn-Cu (Lead (Pb)-free): 245 ± 3 °C, 2 ∼
3 s
Shear (Adhesion) 5 N {0.51 kgf} 10 s
Substratre bending Width 90 mm, bend 3 mm, 5 s, 1 time
Pull-off strength 5 N {0.51 kgf} 10s
ELECTRICAL CHARACTERISTICS
Nominal resistance range 10 Ω ∼ 2 MΩ
Resistance tolerance ± 10 %
Power ratings 0.25 W (85 °C) 0 W (150 °C)
Resistance law Linear law (B)
Maximum input voltage DC300 V or power rating,
whichever is smaller
Maximum wiper current 100 mA or power rating,
whichever is smaller
Effective electrical turn 10 turns
End resistance 1 % or 2 Ω, whichever is greater
C.R.V. 1 % or 3 Ω, whichever is greater
Operating temp. range - 6 ∼ 150 °C
Temp. coefficient ± 100 10-6 /°C maximum
Insulation resistance 1000 MΩ minimum (DC500 V)
Dielectric strength AC600 V, 60 s
Net weight Approx. 0.2 g
ENVIRONMENTAL SPECIFICATIONS
Test item Test conditions Specifications
Thermal shock - 65 ∼ 150 °C
(0.5 h), 5 cycles
[∆R/R ≤ 2 %]
[S.S. ≤ 1 %]
Humidity - 10 ∼ 65 °C
(Relative humidity
80 ∼ 98 %),
10 cycles, 240 h
[∆R/R ≤ 2 %]
Shock 981 m/s2, 6 ms
6 directions for 3
times each
[∆R/R ≤ 1%]
[S.S. ≤ 1 %]
Vibration Amplitude 1.52 mm
or
Acceleration
196 m/s2,
10 ∼ 2000Hz,
3 directions, 12
times each
Load Life 85 °C, 0.25 W, 1000
h
[∆R/R ≤ 2 %]
[S.S. ≤ 1 %]
Low temperature
operation
- 65 °C, 2 h [∆R/R ≤ 1 %]
[S.S. ≤ 1 %]
High temperature
exposure
150 °C, 250 h [∆R/R ≤ 2 %]
[S.S. ≤ 1 %]
Immersion seal 85 °C, 60 s No leaks (No
continuous bubbles)
Soldering heat Sn-Pb
260 °C, 10 s or
215 °C, 35 s
[∆R/R ≤ 1 %]
Sn-Cu
Flow: 260 °C ± 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
Reflow profile for soldering heat evaluation
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
Te
r
u
t
ar
e
pm
e
°C
+5
0