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

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^® Hƒ
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 V_AC with OD ≤4.65mm
- 1250 V_AC with 4.65mm < OD < 17.27mm
- 2000 V_AC with 17.27mm ≤ OD < 26.92mm
- 3000 V_AC 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

EQ/LP/EER Shape

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

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

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

5. Shape Code

C = Cylinder

6. Permeability Code

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