BOURNS 3266 Service Manual
Features
1
3
CW
CLOCKWISE
CCW
2
WIPER
*RoHS COMPLIANT
VERSIONS
AVAILABLE
■ Multiturn / Cermet / Industrial / Sealed
■ Standoffs allow thorough PC board
washing
■ Tape and reel packaging available
■ Patent #4427966 drive mechanism
■ RoHS compliant* version available
3266 - 1/4 ” Square Trimming Potentiometer
Electrical Characteristics
Standard Resistance Range
....................................10 to 1 megohm
(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)
Adjustability
Voltage.....................................±0.02 %
Resistance ...............................±0.05 %
Resolution.....................................Infinite
Insulation Resistance ................500 vdc.
1,000 megohms min.
Dielectric Strength
Sea Level ..................................600 vac
80,000 Feet...............................250 vac
Effective Travel..................12 turns nom.
Environmental Characteristics
Power Rating (300 volts max.)
70 °C ......................................0.25 watt
150 °C .........................................0 watt
Temperature Range....-55 °C to +150 °C
Temperature Coefficient ....±100 ppm/°C
Seal Test........................85 °C Fluorinert
Humidity........MIL-STD-202 Method 103
96 hours (2 % ∆TR, 10 Megohms IR)
Vibration.........30 G (1 % ∆TR; 1 % ∆VR)
Shock...........100 G (1 % ∆TR; 1 % ∆VR)
Load Life ...1,000 hours 0.25 watt 70 °C
(3 % ∆TR; 3 % CRV)
Rotational Life ........................200 cycles
(4 % ∆TR; 3 % or 3 ohms,
whichever is greater, CRV)
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,
wiring diagram, date code,
manufacturer’s model
number and style
Wiper................50 % (Actual TR) ±10 %
Flammability ...........................U.L. 94V-0
Standard Packaging .....50 pcs. per tube
Adjustment Tool ..............................H-90
†
3266W
Common Dimensions
(.285 ±.020)
3266P
3266X
4.50 ±.38**
(.177 ±.015)
7.24 ±.51
4.78 ±.38**
(.188 ±.015)
2.54
(.100)
.46 ±.13
(.018 ±.005)
2.54
(.100)
2.54
(.100)
1.24 ±.25**
(.049 ±.010)
TYP.**
(.040)
.76
(.030)
.76
(.030)
1.02
(.040)
(.100)
1.02
2.54
123
1.02
(.040)
123
123
(.264 ±.015)
1.22 ±.25
(.048 ±.010)
6.71 ±.38
TYP.
ADJ. SLOT
1.78
DIA.
(.070)
.56
WIDE
X
(.022)
.64
DEEP
X
(.025)
.46 ±.13
(.018 ±.005)
.46 ±.03
2.54
(.100)
4.88 ±.38
1.02
2.54
(.100)
1.24 ±.25
(.049 ±.010)
1.22 ±.25
(.048 ±.010)
.46 ±.13
(.018 ±.005)
.76
(.030)
DIA.**
2.54
(.100)
MIN.**
(.018 ±.001)
.76**
(.030)
(.192 ±.015)
(.040)
2.54
(.100)
2.54
(.100)
**COMMON DIMENSIONS
3266Y
4.50 ±.38
(.177 ±.015)
MIN.
3266Z
(.177 ±.015)
1.22 ±.25
(.048 ±.010)
0.46 ±.13
(.018 ±.005)
4.32
(.170)
1.24 ±.25**
(.049 ±.010)
4.50 ±.38
0.38
(.015)
4.32
(.170)
1.24 ±.25**
(.049 ±.010)
2.54
(.100)
2.16
(.085)
MIN.
2.54
(.100)
2.16
(.085)
1.02
(.040)
123
123
6.71 ±.38
(.264 ±.015)
1.02
(.040 )
6.85 ±.51
(.270 ±.020)
2.54
(.100)
3.18
(.125)
7.24 ±.51
(.285 ±.020)
1.22 ±.25
(.048 ±.010)
6.85 ±.51
(.270 ±.020)
2.54
(.100)
3.18
(.125)
4.50 ±.38
(.177 ±.015)
TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED
DIMENSIONS ARE:
MM
(INCHES)
How to Order
3266 W - 1 - 103 __ LF
Model
Style
Standard or Modified
Product Indicator
-1 = Standard Product
Resistance Code
Packaging Designator
Blank = Tube (Standard)
R = Tape and Reel (Z and Y Pin Styles
Only)
A = Ammo Pack (Z and Y Pin Styles Only)
Terminations
LF = 100 % Tin-plated (RoHS compliant)
Blank = 90 % Tin / 10 % Lead-plated
(Standard)
Consult factory for other available options.
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex.
†“Fluorinert” is a registered trademark of 3M Co.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
3266 - 1/4 ” Square Trimming Potentiometer
Standard Resistance Table
Resistance Resistance
(Ohms) Code
10 100
20 200
50 500
100 101
200 201
500 501
1,000 102
2,000 202
5,000 502
10,000 103
20,000 203
25,000 253
50,000 503
100,000 104
200,000 204
250,000 254
500,000 504
1,000,000 105
Popular distribution resistance values listed in
boldface. Special resistances available.
Packaging Specifications
SIDE ADJUST
3266Z-1
3.81 ± .71
(.150 ± .028)
24.9 + .76
(.980 + .030)
8.9 + .76 /- .5
(.035 + .030/ .020)
18 + 1.0/ - 0.5
(709 + .040/ - .020)
12.7 + 0.3/ - 0.25
(.500 + .012/ - .010)
4.32 ± .38
(.170 ± .015)
ALL PINS IN-LINE ON CENTER
DIMENSIONS:
1000/REEL/BOX
MM
(INCHES)
(.100)
3
2.54
12.70
(.500)
2
1
(.157 ± .001)
2.16 ± .25
(.085 ± .010)
.43 ± .05
(017 ± .002)
REF.
18 ± .76
(.709 ± .030)
4.0 ± .03
DIA.
DIA. TYP.
TOP ADJUST
3266Y-1
3.81 ± .71
(.150 ± .028)
8.9 + .76 /- .5
(.035 + .030/ .020)
18 + 1.0/ - 0.5
(709 + .040/ - .020)
12.7 + 0.3/ - 0.25
(.500 + .012/ - .010)
ALL PINS IN-LINE ON CENTER
DIMENSIONS:
1000/REEL/BOX
MM
(INCHES)
4.32 ± .38
(.170 ± .015)
2.54
(.100)
3
12.70
REF.
(.500)
2
1
(1.020 ± .030)
(.709 ± .030)
3.81 ± .71
(.150 ± .028)
25.9 ± 0.76
18 ± .76
4.0 ± .03
(.157 ± .001)
DIA.
2.16 ± .25
(.085 ± .010)
REV. 09/04
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Meets EIA Specification 468.
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