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 
  • 77 = Kool Mμ® 
  • 78 = XFlux®
  • 79 = Kool Mμ® MAX
  • 75 = 75-Series

3. Catalog Number

  • Designates size and permeability 

4. Core Finish Code

Core Finish Voltage Breakdown Material Availability OD Size Availability Permeability Availability
A2 1,000 volts min MPP, High Flux All All
A7 1,000 volts min Kool Mµ, XFlux, 75 Series, Kool Mμ MAX All All
AY 600 volts min All 3.56 - 16.5 mm 14µ - 300µ
A5 2,000 volts min All >4.65 mm All
A9 8,000 volts min All >4.65 mm All
W4 1,000 volts min MPP >4.65 mm 60µ - 200µ
M4 1,000 volts min MPP >4.65 mm 60µ - 200µ
  • No voltage breakdown min for A2 or A7 with OD≤4.65 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 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

 

Non-Toroidal Shapes and THINZ

E-core.jpg

1. Grading Code

  • 00 = Not graded

2. Material Code

  • M = MPP 
  • H = High Flux 
  • K = Kool Mµ® 
  • X = XFlux®

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
  • T = Toroid (THINZ)
  • U = U core 
  • P = I Core/Plate 
  • B = Blocks
  • LE = Large E Core

4. Permeability Code

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

Powder Core Non-Toroidal Shapes Stamping Example:

KME4020E040.jpg