Professional Trimmers
Type 4270 Series
Literature No. 1773167
Issued: 10-05
Dimensions are shown for
reference purposes only.
Dimensions are in millimetres
unless otherwise specified.
Specifications subject to
change.
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Key Features
■High Resolution Cermet
Element
■Reliable, Quality
Performance
■Choice of Adjustment Styles
■0.25 Watt Rating at 70°C
■Low Temperature Coefficient
■Space-Saving Size
■Fully Sealed for Board
Washing
Type 4270 Series
Small modern and reliable, this is
a range of 6mm square multiturn
trimming potentiometers well suited
to industrial and professional
applications. For stability, the range
has a cermet resistance element. The
trimmer is actuated by a lead screw
with slipping clutch at each end of
travel. Components from this range are
available with various adjustment
configurations. They are all fully sealed
to withstand immersion in normal board
washing solvents.
Characteristics -
Electrical
Characteristics -
Mechanical
End Stop: Slipping clutch action, wiper idles
Starting Torque: < 21mNm
Mechanical Adjustment: 14 turns, nominal
Weight: 0.4gm maximum
Resistance Range: 50R to 2M
Resistance Values: 1, 2 and 5 in each decade
Resistance Tolerance: ± 10%
End Resistance: 2 Ohms or 1% whichever is the greater.
Slider Current: 50 mA maximum.
Power Rating: 0.25W at 70°C derating to zero at 125°C
Isolation Voltage: 300 V dc or ac peak maximum
Limiting Element Voltage: 250 V dc or ac RMS maximum
Breakdown Voltage: 420 VAC
Insulation Resistance: 1000 M at 500 V dc
Resolution: Essentially Infinite
Rotational Noise (CRV): 3 Ohms or 3 %, whichever is greater maximum.
Electrical Adjustment: 12 ± 1 turns
Dimensions
Characteristics -
Environmental
Temperature Range: -55°C to +125°C
Thermal Shock: 5 Cycles -55°C to +125°C
Temperature Coefficient: ± 250ppm/°C
Shock: 100g
Vibration Severity: 10 - 500Hz; 10g (0.75mm or 98m/s2)
Rotational Life: 200 Cycles
Load Life at 85°C: ∆R <2% after 1000 hours
Sealing: Sealed for board washing
How to Order
4270 W 502 M
Common Part
W - Top Adjust
X - Side Adjust
Pin Layout
The first two digits are
significant figures of
resistance value and the
third denotes the number
of zeros following.
e.g. 1K: 102
5K: 502
100K: 104
Resistance Value Tolerance
4270 K - ±10 %
