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

CW

CLOCKWISE

YELLOW

CCW

RED

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)

WIDE

X

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.

DIMENSIONS ARE:

MM

(INCHES)

TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED

*”FLUORINERT” IS A REGISTERED TRADEMARK OF 3M CO.

REV. 02/03