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| Part Number | P18/11-3C81 | 
| Datasheet | P18/11-3C81 datasheet | 
| Description | CORES 2PC SET | 
| Manufacturer | Ferroxcube | 
| Series | - | 
| Part Status | Obsolete | 
| Core Type | P (Pot Core) | 
| Inductance Factor (Al) | 4µH | 
| Tolerance | ±25% | 
| Gap | - | 
| Effective Permeability (µe) | 18.40mm | 
| Initial Permeability (µi) | P 18 x 11 | 
| Material | Ungapped | 
| Core Factor (ΣI/A) mm1 | 1900 | 
| Effective Length (le) mm | - | 
| Effective Area (Ae) mm² | 0.597 | 
| Minimum Core Cross Section (Amin) mm² | 25.8 | 
| Effective Magnetic Volume (Ve) mm³ | 43.3 | 
| Finish | 36 | 
| Supplier Device Package | 1120 | 
| Height | Uncoated | 
| Length | 10.60mm | 
| Width | - | 
| Diameter | - |