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Home » Switchmode Transformers » RM Core Style

RM Power Switchmode Transformers

Precision Inc has developed switchmode transformers utilizing industry standard configurations, such as materials and footprints. These "standard" switchmode transformers are designed around a sizing factor number.  To determine which core style will work in your application we offer a Product Family Calculator to assist in the selection. 

If you prefer the RM style core, the sizing factor Calculator is located below.

Features:
  • Good for gapped or ungapped applications.
  • Side pin configuration gives best reliability and manufacturability.

 
Mechanical Characteristics

 

RM Mechnical Drawing

 * For standard product: Please select the quantity for each item you wish to order or receive a quote and click the 'Add To Quote' button below.

* For custom product: Please click 'Custom' button below. You will be directed to a page where you can add custom product information and attach prints.
 
Model
Length (A)
Width (B)
Height (C)-
Pin Spacing (F)
Pin Row (G)
No. of Pins
Sizing Factor
330Khz

Sizing Factor
800Khz

RMSP14  46 mm
(1.810 in)
49.9 mm
(1.960 in)
31 mm
(1.220 in)
5.08 mm
(.200 in)
35.56 mm
(1.400 in)
12
up to 1000
up to 1400
RMSP12  40.8 mm
(1.610 in)
46.7 mm
(1.840 in)
25.4 mm
(1.000 in)
5.08 mm
(.200 in)
33.02 mm
(1.300 in)
12
up to 520
up to 670
RMSP10  31.2 mm
(1.230 in)
40.9 mm
(1.610 in)
19.5 mm
(.768 in)
3.81 mm
(.150 in)
27.94 mm
(1.100 in)
12
up to 270
up to 350
RMSP8  25.4 mm
(1.000 in)
31.4 mm
(1.240 in)
17.3 mm
(.681 in)
3.81 mm
(.150 in)
20.32 mm
(.800 in)
12
up to 150
up to 180
RMSP6  19.8 mm
(.780 in)
26.5 mm
(1.040 in)
13.3 mm
(.524 in)
3.81 mm
(.150 in)
15.24 mm
(.600 in)
8
up to 65
up to 90
RMSP4  12.6 mm
(.496 in)
16.5 mm
(.650 in)
11.3 mm
(.445 in)
3.75 mm
(.148 in)
8.75 mm
(.345 in)
6
up to 27
up to 35
RMSP5  16.7 mm
(.658 in)
20.5 mm
(.807 in)
11.3 mm
(.445 in)
3.75 mm
(.148 in)
12.5 mm
(.492 in)
8
up to 42
up to 60
Displaying 1 to 7 (of 7 products) Result Pages:  1 
Custom
Sizing Factor Calculator

 

EP Sizing Factor

Once the core has been selected please contact our design engineers to assist with the transformer design and manufacturability issues such as; turns ratio, dielectric, wire breakout, pin termination, IEC margins, Rohs, REACH and other construction related requirements.

Sizing factor notes that apply to the chart above:

  1. Sizing constraints: Temperature rise is 40°C, the ambient temperature is 50°C and it does not include IEC Spacing.
  2. Increasing the operational frequency will reduce the sizing factor number and transformer size.
  3. Increasing the temperature rise allowed in the part will reduce sizing factor number and transformer size.
  4. Adding IEC dielectric requirements will increase the sizing factor number and transformer size.