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EP 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 EP style core, the sizing factor Calculator is located below.

Features:
  • Available in through hole and surface mount
  • High power density/volume
  • Small footprint
  • Good for gapped or ungapped applications

 
Mechanical Characteristics

 

EP 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

EP13
Through Hole 
14.4 mm
(.567 in)
14.1 mm
(.555 in)
13.8 mm
(.543 in)
2.54 mm
(.100 in)
10.16 mm
(.400 in)
10
up to 50
up to 63
EP20
Through Hole 
27.3 mm
(1.080 in)
23.3 mm
(.917 in)
20.6 mm
(.811 in)
5.08 mm
(.200 in)
17.78 mm
(.700 in)
10
up to 310
up to 400
EPSM13
Surface Mount 
13.5 mm
(.532 in)
19.8 mm
(.780 in)
14.4 mm
(.567 in)
2.54 mm
(.100 in)
13.4 mm
(.528 in)
10
up to 50
up to 63
EP7
Through Hole 
9.9 mm
(.390 in)
8 mm
(.315 in)
10.8 mm
(.425 in)
2.54 mm
(.100 in)
5.08 mm
(.200 in)
6
up to 18
up to 21
EPSM7
Surface Mount 
9.7 mm
(.382 in)
14.9 mm
(.587 in)
11 mm
(.433 in)
3 mm
(.118 in)
8.95 mm
(.352 in)
6
up to 18
up to 21
EP10
Through Hole 
12.3 mm
(.484 in)
11.7 mm
(.461 in)
12.8 mm
(.504 in)
2.54 mm
(.100 in)
7.62 mm
(.300 in)
8
up to 28
up to 38
EP17
Through Hole 
19.9 mm
(.783 in)
19.5 mm
(.768 in)
16.4 mm
(.646 in)
5.08 mm
(.200 in)
15.24 mm
(.600 in)
8
up to 100
up to 140
EPSM10
Surface Mount 
12.5 mm
(.492 in)
17.8 mm
(.701 in)
12.9 mm
(.508 in)
2.54 mm
(.100 in)
11.4 mm
(.449 in)
8
up to 28
up to 38
EPSM7A
Surface Mount 
9.9 mm
(.390 in)
11.4 mm
(.449 in)
11.3 mm
(.445 in)
2 mm
(.079 in)
7.75 mm
(.305 in)
8
up to 18
up to 21
Displaying 1 to 9 (of 9 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.
 

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