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

Features:
  • Ideal for IEC spacing applications
  • Low leakage inductance
  • Choice of low profile horizontal or upright vertical mounting.

 
Mechanical Characteristics

 

ETD 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

ETDV29 Vertical  35.2 mm
(1.386 in)
24.1 mm
(.949 in)
43.3 mm
(1.705 in)
4.5 mm
(.177 in)
20.3 mm
(.800 in)
12
up to 380
up to 500
ETDV34 Vertical  39.6 mm
(1.559 in)
27.1 mm
(1.067 in)
46.1 mm
(1.815 in)
4.5 mm
(.177 in)
22.9 mm
(.900 in)
14
up to 620
up to 800
ETDV39 Vertical  43.5 mm
(1.713 in)
29.1 mm
(1.146 in)
51 mm
(2.008 in)
4.5 mm
(.177 in)
25.4 mm
(1.000 in)
16
up to 950
up to 1200
ETDV44 Vertical  48.9 mm
(1.925 in)
31.6 mm
(1.244 in)
55.4 mm
(2.181 in)
4.5 mm
(.177 in)
27.9 mm
(1.100 in)
18
up to 1500
up to 2000
ETDV49 Vertical  53.6 mm
(2.110 in)
34.1 mm
(1.343 in)
59.5 mm
(2.343 in)
4.5 mm
(.177 in)
30.5 mm
(1.200 in)
20
up to 2500
up to 3400
ETDH29 Horizontal  35.3 mm
(1.390 in)
37.1 mm
(1.461 in)
28.1 mm
(1.106 in)
3 mm
(.118 in)
25.4 mm
(1.000 in)
14
up to 380
up to 500
ETDH34 Horizontal  39.7 mm
(1.563 in)
42.8 mm
(1.685 in)
34.1 mm
(1.343 in)
4 mm
(.157 in)
25.4 mm
(1.000 in)
14
up to 620
up to 800
ETDH39 Horizontal  44.6 mm
(1.756 in)
47.8 mm
(1.882 in)
37.0 mm
(1.457 in)
4 mm
(.157 in)
30.5 mm
(1.200 in)
16
up to 950
up to 1200
ETDH44 Horizontal  49.7 mm
(1.957 in)
52.4 mm
(2.063 in)
39.4 mm
(1.551 in)
4 mm
(.157 in)
35.6 mm
(1.400 in)
18
up to 1500
up to 2000
ETDH49 Horizontal  54.6 mm
(2.150 in)
57.2 mm
(2.252 in)
41.8 mm
(1.646 in)
4 mm
(.157 in)
40.6 mm
(1.600 in)
20
up to 2500
up to 3400
ETDH54 Horizontal  61.5 mm
(2.421 in)
61.4 mm
(2.417 in)
46.4 mm
(1.827 in)
4.5 mm
(.177 in)
45.7 mm
(1.800 in)
22
up to 3600
up to 5000
ETDH59 Horizontal  66.9 mm
(2.634 in)
66.4 mm
(2.614 in)
49.4 mm
(1.945 in)
4.5 mm
(.177 in)
50.8 mm
(2.000 in)
24
up to 6200
up to 8200
Displaying 1 to 12 (of 12 products) Result Pages:  1 
Custom
Sizing Factor Calculator

 

ETD 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 table 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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