SMU Series
SMD, single-turn, sealed cermet trimmers
• Available in J-hook and gull-wing terminal configurations
• Meets EIA, EIAJ, IPC, VECI standard SMD trimmer designs
• Pb-free and Cd-free construction
• RoHS compliant
• Gold-plated leads provide high conductivity, low contact
resistance, high corrosion resistance and good solderability
• Top cross-slot adjustment (top single-slot models available
as special order)
• Tape and reel packaging
S e r i e S S p e c i f i c at i o n S
Series
SMUA
SMUB
Wattage
0.125
0.25
Manufactured
Range (Ω)
50-2M
50-2M
Rotation
250° ± 10°
250° ± 10°
Adj. Location Taper
Top
Linear
Top
Linear
Tolerance
20%
20%
characteriSticS
Standard Resistance
50Ω to 2MΩ
Range
(standard 1, 2 & 5 sequence)
Resistance Tolerance
±20% standard
Temp. Range
-55°C to +125°C
Resistance Taper
Linear
Low Temperature
-55°C, 0.125 watt, 1 hour
Operation
High Temp.
+125°C, 250 hours
Exposure
Load Life
+70°C, 0.125 watt, 1,000 hours
Thermal Shock
-55°C, +125°C, 30 minutes each,
5 cycles
Shock
100G, 6ms, 6 directions, 3 times
each
ΔT/R≤±2%,
S.S.≤±2%
ΔT/R≤±2%,
S.S.≤±2%
ΔT/R≤±3%,
S.S.≤±2%
ΔT/R≤±2%,
S.S.≤±1%
ΔT/R≤±1%,
S.S.≤±1%
End Resistance
1% or 3Ω, whichever is greater
Peak Noise (C.R.V.)
2% or 3Ω, whichever is greater
Power Rating
SMUA 0.125w @70°C; 0w @+125°C
SMUB 0.250w @70°C; 0w @ +125°C
Maximum Input Voltage
200VDC or power rating, whichever is
smaller
Temperature Coefficient
±100ppm/°C, 200Ω to1MΩ
±250ppm/C, other values
Insulation Resistance
100MΩ minimum at 500VDC
Dielectric Strength
500VAC, 1 minute
Adjustment Travel
250° ±10°
Mechanical Travel
250° ±10°
Shaft Torque
0 gf•cm (0.69 oz• in) max.
Flammability of Plastic
Meets UL 94V-0
Materials
Nominal Weight
0.068g
Stop Strength
200 gf•cm (2.77 oz• in) min.
Soldering Heat
240°C, 10 seconds
Resistance
Seal Test
+85°C, hot water for 1 minute
Humidity
+40°C, 90-95%RH, 0.125 watt,
500 hours
Moisture
-10°C to +65°C, 80-98%RH,
Resistance
0.125 watt, 10 cycles, 240 hours
Vibration
10-2,000Hz, 1.5mm amplitude,
20G, 12 hours
ΔT/R≤±1%,
S.S.≤±1%
ΔT/R≤±3%,
S.S.≤±2%
ΔT/R≤±3%
ΔT/R≤±1%
Rotational Life
100 cycles without discontinuity,
no load
Position of Rotor Inside
#1
#3
Outside Markings
#1
#3
ΔT/R≤±5%
Marking
Resistance value or code, date code
clockwise
#3 cw
ccw #1
#2
wiper
#2
#2
12
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