Part Number: 9277002002
77 U CORE
Explanation of Part Numbers: Digits 1&2 = product class, 3&4 = material grade.
The U core offers an economical core design with a nearly uniform cross-sectional area. In a power ferrite material they are frequently used in output chokes, power input filters and transformers for switched-mode power supplies and HF fluorescent ballasts.
For any U core requirement not listed in the catalog, please contact our customer service group for availability and pricing.
Weight indicated is per pair or set.
Weight: 32 (g)
Chart Legend
•Dimensions (Top numbers are in millimeters, bottom numbers are in nominal inches.).
•An I core, 9377024002, is available for these U cores. See I Core Section of our catalog.
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 26.5 | ±0.70 | 1.043 | _ |
| B | 20.2 | ±0.15 | 0.795 | _ |
| C | 9.75 | +-0.25 | 0.384 | _ |
| D | 14.35 | Min | 0.565 | Min |
| E | 7.25 | Min | 0.286 | Min |
Chart Legend
•An I core, 9377024002, is available for these U cores. See I Core Section of our catalog.
Σl/A : Core Constant, le : Effective Path Length, Ae : Effective Cross-Sectional Area, Ve : Effective Core Volume
AL : Inductance Factor 
| Electrical Properties | |
| AL(nH) | 1185 Min |
| Ae(cm²) | 0.68 |
| Σl/A(cm⁻¹) | 14.1 |
| le(cm) | 9.6 |
| Ve(cm³) | 6.5 |
AL value is measured at 1kHz, < 10 gauss.
These U cores have the same minimum cross-sectional area as the listed effective cross-sectional area.