Part Number: 9077025002
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: 17.5 (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 | 25.4 | ±0.75 | 1 | _ |
| B | 15.75 | +0.25 | 0.625 | _ |
| C | 6.35 | ±0.25 | 0.25 | _ |
| D | 9.4 | Min | 0.37 | Min |
| E | 12.45 | Min | 0.49 | 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) | 790 Min |
| Ae(cm²) | 0.4 |
| Σl/A(cm⁻¹) | 20.7 |
| le(cm) | 8.4 |
| Ve(cm³) | 3.36 |
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.