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RT/RTR & RJ/RJR Series Trim Pots

Convert from MIL-SPEC number to RT/RTR part number

input


mil designation

resistance

terminal type

failure rate

output


RTR part-number

RT part-number (stock failure rate = M level)

terminal drawing


terminal pics

part number explanation


resistance

terminal

failure rate

What are Trim Pots?

Trim Pots are basically miniature three terminal variable resistors (potentiometers). Trim pots have three terminals two of which are connected to a resistive strip or resistive track, the third is connected to an adjustable wiper. The position of the wiper on the resistive track determines the output voltage. The material that’s used for the resistive element typically is made out of a carbon composition(Wirewound) or cermet. Most common appilication for trim pots is fine tuning, (re)calibration, or any other type of adjustments in a circuit on a PCB(Printed Circuit Board). Due to their small size trim pots are very fragile, and most manufactures rate their lifespan at 200 cycles so frequent adjustments are not recommended.

Specifications

RT/RTR and RJ/RJR series trim pots are made to military specifications and are listed on the QPL (Qualified Parts List). Which simply means that they are on a government approved list of parts that are approved for government and military use. RT/RJ series trim pots are made to the MIL-PRF-22097 and the RTR/RJR series trim pots are made to the MIL-PRF-39035. The major difference between RT/RJ and the RTR/RJR series is that the RTR/RJR trim pots are offered with a failure rate. A failure rate is the frequency at which a component fails during testing over a set period of time.

RTR/RJR series of trim pots are offered in three failure rate levels:
Note: Failure per 1000 hours of testing.

  • M = 1.0%
  • P = 0.1%
  • R = 0.01%

Although the RJ/RJR series and the RT/RTR series look pretty much identical, they have two different restive elements used for the resistive track that the wiper follows.

  • RT/RTR = Wirewound
  • RJ/RJR = Cermet

All the series of trim pots mentioned above are a sealed style trim pot, which means that the resistive track and the wiper are covered by a protective material. Depending on the series, these trim pots they may either have a temperature rating of -55°C to 150°C or -65°C to +150°C.

RT/RTR Part Number Breakdown

Example: RTR24 D P 202 M

RTR24 D P 202 M
| | | | |
Model Characteristic Terminal Style Resistance Code Failure Rate
1 2 3 4 5

1. Model

  • RT12
  • RT22
  • RT/RTR24
  • RT/RTR26

2. Characteristic

  • C2 = ±50ppm/°C Temp. Coeff. Max. 85°C-150°C Max. Operating Temp.
  • D = ±50ppm/C° Temp. Coeff. Max.(applies to only RTR)

5. Failure Rate
(applies to only RTR)

  • M = 1%
  • P =.1%
  • R = .01%

4.Resistance Code


RJ/RJR Part Number Breakdown

Example: RJR24 F W 502 R

RJR24 F W 502 R
| | | | |
Model Characteristic Terminal Style Resistance Code Failure Rate
1 2 3 4 5

1. Model

  • RJ12
  • RJ22
  • RJ/RJR24
  • RJ/RJR26
  • RJ/RJR50

2. Characteristic

  • F= ±100 ppm/°C Temp. Coeff. Max.

5. Failure Rate
(applies to only RJR)

  • M = 1.0%
  • P = 0.1%
  • R = 0.01%

4. Resistance Code


Resistance Table RJ/RJR

RT/RTR Terminal Drawings

Terminals RT12

RT12

Terminals RT22

RT/RTR22

Terminals RT24

RT/RTR24

Terminals RT26

RT26

RJ/RJR Terminal Drawings

Terminals RJ12

RJ12

Terminals RJ22

RJ22

Terminals RJ/RJ24

RJ/RJR24

Terminals RJ/RJR26

RJ/RJR26

Terminals RJ/RJR50

RJ/RJR50

Browse our Trim Pot inventory

Bourns Trim Pots Datasheets
RT/RTR Series RJ/RJR Series
Series Datasheet Series Datasheet
RT12 RJ12
RT22/RTR22 RJ22
RT24/RTR24 RJ24/RJR24
RT26 RJ26/RJR26
    RJ50/RJR50