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Features
s
s
s
s
3/8” Square/ Multiturn / Cermet /
Industrial / Sealed
Five popular terminal styles
Standoffs
Patent #4427966 drive mechanism
3299 - 3/8” Square Trimming Potentiometer
Electrical Characteristics
Standard Resistance Range
..................................10 to 2 megohms
(see standard resistance table)
Resistance Tolerance .............±10% std.
(tighter tolerance available)
Absolute Minimum Resistance
...............................1% or 2 ohms max.
(whichever is greater)
Contact Resistance Variation
............................1.0% or 3 ohms max.
(whichever is greater)
Adjustability
Voltage......................................±0.01%
Resistance ................................±0.05%
Resolution.....................................Infinite
Insulation Resistance ................500 vdc.
1,000 megohms min.
Dielectric Strength
Sea Level ..................................900 vac
70,000 Feet...............................350 vac
Effective Travel..................25 turns nom.
Environmental Characteristics
Power Rating (300 volts max.)
70°C .........................................0.5 watt
125°C ..........................................0 watt
Temperature Range ......-55°C to +125°C
Temperature Coefficient .....±100ppm/°C
Seal Test ........................85°C Fluorinert*
Humidity........MIL-STD-202 Method 103
96 hours
(2%
∆TR,
10 Megohms IR)
Vibration............20G (1%
∆TR;
1%
∆VR)
Shock..............100G (1%
∆TR;
1%
∆VR)
Load Life
................1,000 hours 0.5 watt @ 70°C
(3%
∆TR;
3% or 3 ohms,
whichever is greater, 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 ......................................0.035 oz.
Marking ...........................Manufacturer’s
trademark, resistance code,
wiring diagram, date code,
manufacturer’s model
number and style
Wiper ..............................Set at CW end
Flammability ..........................U.L. 94V-0
Standard Packaging .....50 pcs. per tube
Adjustment Tool ..............................H-90
*”FLUORINERT” IS A REGISTERED TRADEMARK OF 3M CO.
3299P
Common Dimensions
.38
(.015)
9.53
(.375)
1.09
(.043)
1.12
(.044)
Standard Resistance Table
2.54
(.100)
2.54
(.100)
1.52
(.060)
10.03
(.395)
3
.51
ADJ. SLOT 2
DIA. TYP.
(.020)
2.29 DIA.
1
(.090)
.56
WIDE
X
(.022)
5.23
.64
2.54
DEEP
(.206)
X
(.025)
(.100)
BOTTOM VIEW
1.91
3299W
(.075)
2.54
(.100)
3
2
1
2.54
(.100)
MIN.
6.22
±
1.14
(.245
±
.045)
6.10 +.30/-.25
(.240 +.012/-.010)
Resistance
(Ohms)
10
20
50
100
200
500
1,000
2,000
5,000
10,000
20,000
25,000
50,000
100,000
200,000
250,000
500,000
1,000,000
2,000,000
Resistance
Code
100
200
500
101
201
501
102
202
502
103
203
253
503
104
204
254
504
105
205
Popular values listed in boldface. Special
resistances available.
How To Order
BOTTOM VIEW
3299 W - 1 - 103
Model
Style
Standard or Modified
Product Indicator
-1 = Standard Product
Resistance Code
Consult factory for other available options.
3299X
2.54
(.100)
2.54
(.100)
3
2
1
1.91
(.075)
BOTTOM VIEW
3299Y
2.54
(.100)
2.54
(.100)
1.91
(.075)
3
2
1
2.54
(.100)
BOTTOM VIEW
3299Z
2.54
(.100)
2.54
(.100)
3
2
1
1.91
(.075)
2.54
(.100)
BOTTOM VIEW
2
CCW
WIPER
1
CLOCKWISE
3
CW
TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED
DIMENSIONS ARE:
METRIC
(INCHES)
Specifications are subject to change without notice.
31
BOURNS [ BOURNS ELECTRONIC SOLUTIONS ]
