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®
  • 75 = 75-Series
  • 76 = Kool Mµ®
  • 77 = Kool Mμ® 
  • 78 = 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,  XFlux,  75 Series, Kool Mμ MAX, Kool Mµ Hƒ All
AY 600 volts min All 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
  • AY finish not available for MPP 550µ
  • *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

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

 

EQ Shape

eq-(1).JPG

1. Shape Code                                                                              
  • EQ = EQ geometry

2. Material Code

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

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

6. Size Code - Leg

  • Leg length in mm
     

LP Shape

eq-(1).JPG

1. Shape Code                                                                              
  • LP = LP geometry

2. Material Code

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

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

6. Size Code - Leg

  • Leg length in mm
     

EER Shape

1. Shape Code                                                                              
  • ER = EER geometry

2. Material Code

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

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

6. Size Code - Leg

  • Leg length in mm
     

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®
  • Y = 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
  • 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
  • 075 for 75µ
  • 090 for 90µ 

Non-Toroidal Shapes Stamping Example       EQ Shape Stamping Example

KME4020E040.jpg