Features
■ 3/8 ” Square/ Multiturn / Cermet /
Industrial / Sealed
■ Five popular terminal styles
■ Standoffs
■ RoHS compliant* version available
■ For trimmer applications/processing
guidelines,
click here
3299 - 3/8 ” Square Trimpot® Trimming Potentiometer
“Trimpot” is a registered trademark of Bourns, Inc.
†“Fluorinert” is a registered trademark of 3M Co.
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 ...................................
Insulation Resistance ...............500 vdc.
1,000 megohms min.
Dielectric Strength
Sea Level................................ 900 vac
70,000 Feet ............................ 350 vac
.................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
... ±100 ppm/°C
Seal Test ......................85 °C Fluorinert†
Humidity .......MIL-STD-202 Method 103
96 hours
(2 % ΔTR, 10 Megohms IR)
Vibration ....... 20 G (1 % ΔTR; 1 % ΔVR)
Shock ......... 100 G (1 % ΔTR; 1 % ΔVR)
Load Life
............. 1,000 hours 0.5 watt @ 70 °C
(3 % ΔTR; 3 % or 3 ohms,
whichever is greater, CRV)
Rotational Life .......................200 cycles
(4 % ΔTR; 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 ............... 50 % (Actual TR) ±10 %
Flammability ..........................U.L. 94V-0
Standard Packaging .....50 pcs. per tube
Adjustment Tool ..............................H-90
Product Dimensions
13CW
CLOCKWISE
CCW
2WIPER
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
2,000,000 205
REV. 11/16
TOLERANCES: ± 0.25 EXCEPT WHERE NOTED
(.010)
DIMENSIONS: MM
(INCHES)
How To Order
3299 W - 1 - 103 LF
Model
Style
Product Indicator
-1 = Standard Product
Resistance Code
Terminations
LF = 100 % Tin-plated (RoHS compliant)
Blank = 90 % Tin / 10 % Lead-plated
(Standard)
Consult factory for other available options.
Popular distribution resistance values listed in
boldface. Special resistances available.
1.52
(.060)
3
2
1
BOTTOM VIEW
BOTTOM VIEW
BOTTOM VIEW
BOTTOM VIEW
BOTTOM VIEW
3299P
Common Dimensions
1.09 ± .254
(.043 ± .010)
6.10 +.30/-.25
(.240 +.012/-.010)
3299W 1.91
(.075)
2
3
1
3299X
2
3
1
3299Y
2
3
1
3299Z
2
3
1
2.54
(.100)
2.54
(.100)
2.54
(.100)
2.54
(.100)
2.54
(.100)
2.54
(.100)
2.54
(.100)
2.54
(.100)
2.54
(.100)
1.91
(.075)
1.91
(.075)
1.91
(.075)
2.54
(.100)
MIN.
2.54
(.100)
2.54
(.100)
2.54
(.100)
.51
(.020) DIA. TYP.
5.23
(.206)
10.03
(.395)
.38
(.015)
9.53
(.375)
1.12 ± .254
(.044 ± .010)
6.22 ± 1.14
(.245 ± .045)
ADJ. SLOT
2.29
(.090)
.56
(.022)
.64
(.025)
WIDE
X
XDEEP
DIA.
*RoHS COMPLIANT
VERSIONS
AVAILABLE
Product Dimensions
TOLERANCES: ± 0.25 EXCEPT WHERE NOTED
(.010)
DIMENSIONS: MM
(INCHES)
*RoHS COMPLIANT
VERSIONS
AVAILABLE
WARNING Cancer and Reproductive Harm
www.P65Warnings.ca.gov
*RoHS Directive 2002/95/EC Jan. 27, 2003 including
annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifications are subject to change without notice.
Users should verify actual device performance in their
specific applications. The products described herein
and this document are subject to specific legal
disclaimers as set forth on the last page of this
document, and at
www.bourns.com/docs/legal/disclaimer.pdf.
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and
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The characteristics and parameters of a Bourns® product set forth in its data sheet are based on laboratory conditions, and
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the user’s sole risk.
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also apply to such Bourns® custom products.
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PDF: http://www.bourns.com/docs/Legal/disclaimer.pdf
*9