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| PartNumber | B66381GX127 | B66381GX172 | B66381GX187 |
| Description | EMI/RFI Suppressors & Ferrites Ferrite Cores & Accessories E40/16/12 N27OL | EMI/RFI Suppressors & Ferrites Ferrite Cores & Accessories E40/16/12 N72 UNGAPPED | EMI/RFI Suppressors & Ferrites Ferrite Cores & Accessories FERRITE CORES & ACCESSORIES |
| Manufacturer | EPCOS (TDK) | - | EPCOS (TDK) |
| Product Category | Ferrite Cores | - | Ferrite Cores |
| Material | N27 | - | N87 |
| Series | B66381 | - | B66381 |
| Product | Ferrite Cores | - | Ferrite Cores |
| Type | Ungapped | - | Ungapped |
| Packaging | Bulk | - | Bulk |
| Height | 16.50mm | - | 16.50mm |
| Length | 40.60mm | - | 40.60mm |
| Width | 12.50mm | - | 12.50mm |
| Supplier Device Package | E 40 x 16 x 12 | - | E 40 x 16 x 12 |
| Tolerance | - 20 % + 30 % | - | - 20 % + 30 % |
| Core Type | E | - | E |
| Core Size | 40 x 16 x 12 | - | 40 x 16 x 12 |
| Diameter | - | - | - |
| Inductance | 3800 nH | - | 4150 nH |
| Inductance Factor Al | - | - | - |
| Gap | Ungapped | - | Ungapped |
| Effective Permeability μe | - | - | - |
| Initial Permeability μi | - | ||
| Core Factor ΣI A mm 1 | - | ||
| Effective Length le mm | - | ||
| Effective Area Ae mm2 | - | ||
| Minimum Core Cross Section Amin mm2 | - | - | - |
| Effective Magnetic Volume Ve mm3 | - | ||
| Finish | Uncoated | - | Uncoated |
| Core | E Core | - | E Core |
| Part # Aliases | B66381G0000X127 | - | B66381G0000X187 |
| Core Material | N27 | - | N87 |