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 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 maxcoated 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