3250/RT22/RTR22 - 1/2 ” Square Trimming Potentiometer
Specifications are subject to change without notice.
Features
■ Multiturn / Wirewound / Sealed
■ Listed on the QPL for style RT22 per
MIL-R-27208 and RTR22 per
High-Rel MIL-R-39015
■ Panel Mount option available
Electrical Characteristics
Standard Resistance Range
3250 .....................................10 to 50K ohms
RT22.....................................50 to 20K ohms
RTR22 ................................500 to 20K ohms
(see standard resistance table)
Resistance Tolerance.......................±5 % std.
(tighter tolerance available)
Absolute Minimum Resistance
......0.1 % or 1 ohm max. (whichever is greater)
Noise...............................100 ohms ENR max.
Resolution .....................See Resistance Table
Insulation Resistance.........................500 vdc.
1,000 megohms min.
Dielectric Strength
Sea Level........................................1,000 vac
80,000 Feet .......................................400 vac
Adjustment Travel......................25 turns nom.
Environmental Characteristics
Power Rating @ 85 °C
3250..................................................1.0 watt
RT22/RTR22 ...................................0.75 watt
Power Rating @ 150 °C .........................0 watt
Temperature Range.............-65 °C to +150 °C
Temperature Coefficient
3250 ...........................................±50 ppm/°C
RT22/RTR22...............................±50 ppm/°C
Seal Test ......85 °C Fluorinert* (pin styles only)
Humidity ................MIL-STD-202 Method 106
3250 .................(2 % ∆TR; 100 Megohms IR)
RT22...................(1 % ∆TR; 10 Megohms IR)
RTR22 ..............(1 % ∆TR; 100 Megohms IR)
Vibration...................................................30 G
(1 % ∆TR; 0.5 % + resolution ∆VR)
Shock.....................................................100 G
(1 % ∆TR; 0.5 % + resolution ∆VR)
Load Life
3250...............1,000 hours 1.0 watt @ 85 °C
(2 % ∆TR; 500 ohms ENR)
RT22 ............1,000 hours 0.75 watt @ 85 °C
(2 % ∆TR; 2 % + resolution ∆VR)
RTR22 ........10,000 hours 0.75 watt @ 85 °C
(3 % ∆TR; 2 % + resolution ∆TR)
Rotational Life.................................200 cycles
3250 ....................(2 % ∆TR; 500 ohms ENR)
RT22/RTR22 ..................................(2 % ∆TR)
Physical Characteristics
Torque ......................................5.0 oz-in. max.
Mechanical Stops ..........................Wiper idles
Terminals
3250..............Solderable printed circuit pins
Flexible leads (7 strands of 30 AWG)
RT22/RTR22 .......MIL-STD-202; Method 208
Weight .................................................0.06 oz.
Machine Screw Mounting
Torque .....................................12 oz-in. max.
Marking
3250.....................Manufacturer’s trademark,
resistance code, terminal numbers,
date code, manufacturer’s model
number and style
RT22/RTR22 ..............Mil-spec part number
Wiper ........................................Set at CW end
Flammability....................................U.L. 94V-0
Standard Packaging
P&W Styles..........................25 pcs. per tube
L Style...................................25 pcs. per bag
Adjustment Tool.......................................H-90
1 3
GREEN
CW
CLOCKWISE
YELLOW
CCW
2
WIPERRED
1.98
(.078)
3250P/RT22/RTR22 Common Dimensions
(Pin Styles)
12.7
(.500)
TYP.
TYP.
DIA. THRU
(2 PLACES)
.89
(.035)
TYP.
1.78
(.070)
5.59
(.220)
TYP.
13.33 ± .64
(.525 ± .025)
.71 ± .08
(.028 ± .003)
2.54
(.100)
2.54
(.100)
6.35
(.250)
1
2
3
"L" Flex Lead Type
RT22 has mounting slots
RTR22 has mounting holes
2.36
(.093)
13.21
(.520)
12.70
(.500)
1.40
(.055)
4.75
(.187)
.89
(.035)
1.52
(.060)
152.4
(6.00)
2.79
(.110)
3250W/RT22/RTR22
2
1
3
3250W-66/RT22X/RTR22X
2
1
3
2.79
(.110)
12.7
(.500)
12.7
(.500)
2.54
(.100)
2.54
(.100)
2.54
(.100)
2.54
(.100)
2.54
(.100)
6.35
(.250)
6.35
(.250)
6.35
(.250)
DIA. TYP.
TYP.
TYP.
TYP.
TYP.
TYP.
LENGTH MIN.
DIA. THRU
(2 PLACES)
13.21
(.520)
2.03 ± .38
(.080 ± .015)
WIDEX
X DEEP
DIA.
ADJ. SLOT
3.1
(.122)
.64
(.024)
Standard Resistance Table
Popular values listed in boldface. Special
resistances available.
How To Order
3250 L - 1 - 103 M
Model
Style
Standard or Modified
Product Indicator
-1 = Standard Product
Resistance Code
Optional Suffix Letter
M = Panel Mount
(Factory Installed)
See “Mil-Spec Numbering System” for RT22/
RTR22 ordering information.
Consult factory for other available options.
Nominal
Resistance Resistance Resolution
(Ohms) Code (Percent)
10 100 1.30
20 200 1.00
50 500 0.80
100 101 0.90
200 201 0.70
500 501 0.60
1,000 102 0.40
2,000 202 0.30
5,000 502 0.25
10,000 103 0.19
20,000 203 0.16
25,000 253 0.14
50,000 503 0.13
SHADED AREAS TYPICALLY NOT STOCKED BY
DISTRIBUTORS AND NOT RECOMMENDED FOR NEW
DESIGNS.
AVAILABLE
THROUGH
DISTRIBUTION
DIMENSIONS ARE:
MM
(INCHES)
TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED
*”FLUORINERT” IS A REGISTERED TRADEMARK OF 3M CO.
REV. 02/03