※Please refer to the LIST OF PART NUMBERS when placing orders.
ST-32
SURFACE MOUNT CERMET TRIMMERS (SINGLE TURN)
Part name
1
2
3
4
5
6
7
8
9
Rotor
Terminal pin
Wiper
Base element
“O” ring
Cover
Housing
Material
Flammability
—
UL94V-0
—
UL94HB
UL94V-0
—
Ag-Pd cermet
RuO2 cermet
Stainless steel (SUS 304)
Epoxy
Copper alloy, Sn-Cu-plated
Ceramic
Silicone rubber
Polyphenylenesulphide
Electrode
Resistive element
Multi metal alloy
■
FEATURES
ORoHScompliant
ORotorwithacrossslotforeaseofadjustment
O Leadedterminalsprovidestrongasadhesivestrength
againstP.C.B.bending
OJ-hook,Gullwingandleadedterminalconfigurations
OSealed(Washable:Refertopage698.)
■
PART NUMBER DESIGNATION
S T - 3 2 E T A 1 0 0 Ω ( 1 2 )
Series name
Terminal pin
E：Sn-Cu (Lead-free)
Form of packaging
T：Taping (Reel)
Blank：Bulk in plastic bag
Resistance code
Resistance value
Product shape (Shape of terminal)
A,G：J-hook
B,H：Gull wing
INTERNAL STRUCTURE
2
3
4
9
8
5
6
7
1
RoHS compliant
Adjustment
position
J-hook
J-hook
Gull wing
Gull wing
ST-32
SURFACE MOUNT TRIMMERS
■
LIST OF PART NUMBERS
Shape of
terminal
Form of packaging
Taping (reel)
ST-32ETA ST-32EA
ST-32ETB ST-32EB
ST-32ETG ST-32EG
ST-32ETH ST-32EH
500 pcs./reel 100 pcs./pack
Plastic bag
Pieces in package
■
ELECTRICAL CHARACTERISTICS
Nominal resistance range
10 Ω ~ 2 M Ω
± 20 %
0.125 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
Ω
~ 50
Ω
: ± 250 10-6/°C maximum
100
Ω
~ 2 M
Ω
: ± 100 10-6/°C maximum
1000 M
Ω
minimum (DC500 V)
AC500 V, 60 s
Approx. 0.05 g (ST-32EA, EB)
Approx. 0.11 g (ST-32EG, 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
Top
adjustment
A (
B (
)
)
Side
adjustment
G (
H (
)
)
ΔR/R：Change in total resistance
S.S. ：Setting stability
〈
Nominal resistance values
〉
A 10
Ω
A 20
Ω
50
Ω
100
Ω
200
Ω
300
Ω
500
Ω
1 k
Ω
2 k
Ω
3 k
Ω
5 k
Ω
10 k
Ω
20 k
Ω
30 k
Ω
50 k
Ω
100 k
Ω
200 k
Ω
500 k
Ω
1 M
Ω
2 M
Ω
The products indicated by A mark are manufactured upon receipt of order basis.
※The part numbers on the left are all available with the respective com bi na tion 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.
■
MECHANICAL CHARACTERISTICS
Mechanical angle 250 ° (1 turn)
5 mN·m {51 gf·cm} maximum
20 mN·m {204 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
{ }
：
Reference only
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/s2, 6 ms
6 directions for 3 times each [ΔR/R ≦ 1 %]
[S.S. ≦ 1 %]
Vibration
(Amplitude) 1.52 mm or
(Acceleration) 196 m/s2,
10 ~ 2000 Hz, 3 directions, 12 times each
Load life 70 °C, 0.125 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 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
Flow :
260 ± 3 °C as the temperature in a
pot of molten solder, immer sion from head of
ter minal to backside of board, 5 ~ 6 s, two
times maximum.
Reflow : Peak temperature 255 °C
(Please refer to the profile below.)
手はんだ 
Manual soldering：350 ± 10 °C, 3 ~ 4 s
ST-32
SURFACE MOUNT TRIMMERS
■
MAXIMUM INPUT RATINGS
■
RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS
Nominal resistance
values ( Ω)
Resistance code Maximum input
voltage (V)
Maximum wiper
current (mA)
A
10 11 1.00 100
A
20 21 1.58 79.1
50 51 2.50 50.0
100 12 3.53 35.4
200 22 5.00 25.0
300 32 6.12 20.4
500 52 7.91 15.8
1 k 13 11.2 11.2
2 k 23 15.8 7.91
3 k 33 19.4 6.45
5 k 53 25.0 5.00
10 k 14 35.4 3.54
20 k 24 50.0 2.50
30 k 34 61.2 2.04
50 k 54 79.1 1.58
100 k 15 112 1.12
200 k 25 158 0.79
500 k 55 200 0.40
1 M 16 200 0.20
2 M 26 200 0.10
(Unit : mm)
OST-32EA, EG OST-32EB, EH
Note) The zero point is the center of mounting.
For reflow soldering
The products indicated by A mark are manufactured upon
receipt of order basis.
1.2 0.8
3.2
1.2
0
1.6
1.50.9
4.6
11.2
1.2 0.8
3.2
1.2
0
1.6
2.20.9
6
11.9
■
OUTLINE DIMENSIONS Unless otherwise specified, tolerance : ± 0.3 (Unit : mm)
OST-32EA
Top adjustment
※
Note the terminal position.
1.5
2
0.5
3.4
1.9
3.5
2
3.4 2 2.1
0.05 2 – 0.7
1
3
Cross slot for a 0 bit driver, depth : 0.45
Resistance code 2 digits
t = 0.12
Production date code & Lead-free Identification mark
1 digit (Location reversed every 2 years)
0.6
1
OST-32EB
Top adjustment
1.5
2
0.5
3.4
1.9
4.4
2
3.4 2 2.1
0.05 2 – 0.7
1
3
Cross slot for a 0 bit driver, depth : 0.45
Resistance code 2 digits
1
t = 0.12
Production date code & Lead-free Identification mark
1 digit (Location reversed every 2 years)
CW rotation
1
2
3
ST-32
SURFACE MOUNT TRIMMERS
■
OUTLINE DIMENSIONS Unless otherwise specified, tolerance : ± 0.3 (Unit : mm)
OST-32EG
Side adjustment
1.5
0.5
4.7
1.9
2.6
3.6
Cross slot for a 0 bit driver, depth : 0.45
Resistance code 2 digits
Adjustment
0.2
3.5 2.4
1
1.1 1.7 1
2 – 0.6
31
2
t = 0.12
Production date code & Lead-free Identification mark
1 digit (Location reversed every 2 years)
OST-32EH
Side adjustment
1.5
0.5
4.7
1.9
2.6
3.6
Cross slot for a 0 bit driver, depth : 0.45
Resistance code 2 digits
Adjustment
0.2
3.5
2.4
1
1.3 1.7 1.4
2 – 0.6
31
2
t = 0.12
Production date code & Lead-free Identification mark
1 digit (Location reversed every 2 years)
CW rotation
1
2
3
ST-32
SURFACE MOUNT TRIMMERS
※
Note the terminal position.
<Bulk pack specifications>
OUnitofbulkinaplasticbagis100pcs.perpack.
O Boxingof bulkinaplasticbagisperformedwith500
pcs.perbox.
■
PACKAGING SPECIFICATIONS
Maximumnumberofconsecutivemissingpieces=2
Leaderlengthandreeldimensionareshowninthe
diagramsbelow.
<Taping packaging specifications>
OTapingversionispackagedin500pcs.perreel.
Orderswillbeacceptedforunitsof500pcs.,i.e.,500,
1000,1500pcs.,etc.
O ST-32ETA,ETBversionsareboxedwith4reels (2000
pcs.).ST-32ETG,ETHversionsareboxedwithonereel
(500pcs.).
OEMBOSSED TAPE DIMENSIONS OREEL DIMENSIONS
（Conforms to JIS C 0806-3）
（In accordance with EIAJ ET-7200A）
(Unit: mm)
OST-32ETA, ETB
13.4±1 (ETG/ETH)
17.4±1 (ETG/ETH)
15.4±1 (ETA/ETB)
13 (ETA/ETB)
+1
0
(ETA/ETB)
+1
0
180 0
–1.5
(ST-32ETA/ETB)
21±0.8
13±0.2
2±0.5
60
φ
φ
φ
254±2
(ST-32ETG/ETH)
φ
φ
(ETG/ETH)
50 min.
φ
2
4 ± 0.1 2 ± 0.05
1.75 ± 0.1
5.5 ± 0.05
12
1.5 +0.1
0
8 ± 0.1
1
3
0.3 0.1
2.5
Installation example
(ST-32EA)
Direction of feed
OST-32ETG, ETH
2
4 0.1
2 0.1
1.75 0.1
5.5 0.1
12
1.5 +0.1
0
8 0.1
1
3
0.4 0.1
5.5 max.
Installation example
(ST-32EH)
Direction of feed
ST-32
SURFACE MOUNT TRIMMERS
Empty Filled Empty
40 mm min. 20 pitches min.
400 mm min.
Direction of feed
HeadEnd
Leader