Features
■ Low TCR
Applications
■ Rheostat applications with wiper currents
less than 25 microamps
■ Multiturn / Cermet / Industrial / Sealed
■ Process control instrumentation
■ Power supplies
■ Standoffs allow thorough PC board
washing
■ Patent #4427966 drive mechanism
3266-LTC - 1/4” Square Trimming Potentiometer
3266W
Common Dimensions
Electrical Characteristics
Standard Resistance Table
1.52 ± .38
(.060 ± .015)
Standard Resistance Range
*
Resistance
(Ohms)
Resistance
Code
6.35
(.250)
.....................................2K to 25K ohms
(see standard resistance table)
Resistance Tolerance .............±10% std.
Absolute Minimum Resistance
...............................1% or 2 ohms max.
(whichever is greater)
Contact Resistance Variation
............................3.0% or 3 ohms max.
(whichever is greater)
TYP.
*
2,000
5,000
10,000
20,000
25,000
202
502
103
203
253
ADJ. SLOT
1.78
(.070)
DIA.
4.32 ± .38
*
(.170 ± .015)
.56
(.022)
1.02
(.040)
WIDE
X
X
6.85 ± .51
TYP.
*
.64
(.270 ± .020)
DEEP
(.025)
Popular values listed in boldface. Special
resistances available.
.38
4.78 ± .38
(.188 ± .015)
*
(.015)
1
2 3
Adjustability
.46 ± .03
(.018 ± .001)
DIA.
*
Voltage ......................................±0.02%
Resistance ................................±0.05%
Resolution.....................................Infinite
Insulation Resistance ................500 vdc.
1,000 megohms min.
2.54
(.100)
2.54
(.100)
How To Order
.76*
(.030)
2.54
(.100)
3266 W - LTC - 103
1.02
(.040)
Model
Dielectric Strength
Style
Sea Level ..................................600 vac
80,000 Feet...............................250 vac
Effective Travel..................12 turns nom.
3266P
Product Indicator
1
2
3
.76
(.030)
4.32 ± .38
(.170 ± .015)
Resistance Code
Consult factory for other available options.
Environmental Characteristics
1.02
(.040)
Power Rating (300 volts max.)
2.54
(.100)
70°C .......................................0.25 watt
150°C ..........................................0 watt
Temperature Range
....................................-55°C to +150°C
Temperature Coefficient
2.54
(.100)
2.54
.76
(.030)
(.100)
End to End ..........................±20ppm/°C
Through the Wiper..............±50ppm/°C
Seal Test ........................85°C Fluorinert*
Humidity........MIL-STD-202 Method 103
96 hours (2% ∆TR, 10 Megohms IR)
Vibration............30G (1% ∆TR; 1% ∆VR)
Shock..............100G (1% ∆TR; 1% ∆VR)
Load Life ....1,000 hours 0.25 watt 70°C
(3% ∆TR; 3% CRV)
3266X
1.52
(.060)
1.02
(.040)
1.02
(.040)
1
2 3
.38
(015)
MIN.
Rotational Life ........................200 cycles
(4% ∆TR; 3% or 3 ohms,
*
2.54
(.100)
2.54
(.100)
whichever is greater, CRV)
.76
(.030)
2.54
(.100)
Physical Characteristics
Torque .............................3.0 oz-in. max.
Mechanical Stops..................Wiper idles
Terminals ........................Solderable pins
Weight ......................................0.015 oz.
Marking ...........................Manufacturer’s
trademark, resistance code,
1.02
(.040)
Common dimensions
*
WIPER
2
wiring diagram, date code,
manufacturer’s model
CW
CCW
3
1
number and style
CLOCKWISE
Wiper ...........Positioned at 50% nominal
Flammability...........................U.L. 94V-0
Standard Packaging .....50 pcs. per tube
Adjustment Tool ..............................H-90
TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED
METRIC
DIMENSIONS ARE:
(INCHES)
NOTE: TCR through the wiper applies when 40% or more
of the resistance element is in the circuit.
*”FLUORINERT” IS A REGISTERED TRADEMARK OF 3M CO.
21
Specifications are subject to change without notice.
BOURNS [ BOURNS ELECTRONIC SOLUTIONS ]
