How To Order Magnetics Powder Cores


Magnetics powder cores have unique part numbers that provide important information about the characteristics of the cores. A description of part type is provided below.

Toroids

toroid2.jpg

1. Grading Code

  • C0 = Graded into 2% inductance bands (OD <5 mm, 5% bands)
  • 00 = Not graded

2. Material Code

  • 55 = MPP 
  • 58 = High Flux 
  • 59 = Edge® / HIgh DC Bias Edge*
  • 70 = Kool Mµ®  Ultra
  • 74 = XFlux® Ultra
  • 75 = 75-Series
  • 76 = Kool Mµ®
  • 77 = Kool Mμ® 
  • 78 = XFlux® / High DC Bias XFlux*
  • 79 = Kool Mμ® MAX

3. Catalog Number

  • Designates size and permeability 

4. Core Finish Code

Core Finish Voltage Breakdown Material Availability OD Size Availability
A2 2,000 volts min** MPP, High Flux, Edge All
A7 2,000 volts min** Kool Mµ, Kool Mμ MAX, Kool Mµ Hƒ, Kool Mµ Ultra, XFlux, XFlux Ultra, 75 Series All
AY 600 volts min All
(not available in 550µ MPP)
3.56 - 16.6 mm
A9 8,000 volts min All >4.65 mm
W4 1,000 volts min MPP >4.65 mm
M4 1,000 volts min MPP >4.65 mm
  • *High DC Bias Edge and High DC Bias XFlux contain -S01 suffix
  • **A2 and A7 voltage breakdown min varies by size:
    • 1000 VAC with OD 4.65mm
    • 1250 VAC with 4.65mm < OD < 17.27mm
    • 2000 VAC with 17.27mm OD < 26.92mm
    • 3000 VAC with OD 26.92mm
  • UL rating is available upon request and contains -UL suffix
     
  • Custom height toroids available based on pressed height or coated height
    • Pressed height part suffix example: P185 suffix for pressing to nominal bare core height of 18.5 mm
    • Coated height part suffix example: HT330 suffix for max coated height of 33.0 mm

Powder Core (Toroid) Stamping Summary

Size        (O.D. mm) 6-digit
Shop Order Number
2-digit
Material Code
3-digit
Catalog Number
2-digit
Core Finish Code
Inductance
Code
Inductance
Example 
6.35-6.86
    123456 020 +6
7.87-12.7    123456 050A2 +6
>12.7  123456 55120A2 +6
  • Inductance Code is only stamped on MPP and High Flux toroids with C0- Grading Code.
  • Shop Order number identifies the product batch, ensuring traceability of every core through the entire manufacturing process, back to raw materials.
  • Cores with O.D. less than 6.35 mm are not stamped.

Powder Core Toroid Stamping Examples

PowderCoreStamping.JPG

 

EQ/LP/EER Shape

eq-(1).JPG

1. Shape Code                                                                              
  • EQ = EQ geometry
  • LP = LP geometry
  • ER = EER geometry

2. Material Code

  • G = Edge®
  • H = High Flux 
  • K = Kool Mµ® 
  • X = XFlux®
  • Y = Kool Mµ® MAX

3. Size Code - Back Wall

  • Back wall length in mm

4. Size Code - Width

  • Width in mm

5. Permeability Code

  • E026 for 26µ
  • E040 for 40µ
  • E060 for 60µ
  • E075 for 75µ

6. Size Code - Leg

  • Leg length in mm (i.e. 101 for 10.1 mm)
     

Other Non-Toroidal Shapes and THINZ

E-core.jpg

1. Grading Code

  • 00 = Not graded

2. Material Code

  • F = Kool Mµ® Hf
  • G = Edge®
  • H = High Flux 
  • K = Kool Mµ® 
  • M = MPP 
  • X = XFlux®
  • Y or A= Kool Mµ® MAX

3. Size Code

  • First two digits = length in mm
  • Last two digits = height in mm   *not listed for Large E Cores

3. Shape Code

  • E = E Core
  • LE = Large E Core
  • T = Toroid (THINZ)
  • U = U core 
  • P = I Core/Plate 
  • B = Blocks
  • LB = Large Block ("A" dimension longer than 99 mm)
  • R = Round Block

4. Permeability Code

  • 014 for 14µ
  • 026 for 26µ
  • 040 for 40µ
  • 060 for 60µ
  • 075 for 75µ
  • 090 for 90µ 

Non-Toroidal Shapes Stamping Example       EQ Shape Stamping Example

KME4020E040.jpg           

Cylinders

1. Grading Code

  • 00 = Not graded

2. Material Code

  • G = Edge®
  • H = High Flux
  • K = Kool Mµ® 
  • X = XFlux®

3. Size Code: OD in integer mm

4. Size Code: HT in integer mm

3. Shape Code

  • C = Cylinder

4. Permeability Code

  • 014 for 14µ
  • 026 for 26µ
  • 040 for 40µ
  • 060 for 60µ
  • 075 for 75µ
  • 090 for 90µ