U Cores (9077002002)
77 U CORE
77 Material
Inductive Components
Closed Magnetic Circuit
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Part Number: 9077002002
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: 1.4 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 8.9 | -0.50 | 0.341 | _ |
| B | 4.45 | +0.25 | 0.18 | _ |
| C | 4.05 | ±0.20 | 0.159 | _ |
| D | 1.3 | Min | 0.052 | Min |
| E | 2.3 | Min | 0.091 | 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) | 695 Min |
| Ae(cm2) | 0.124 |
| Σl/A(cm-1) | 16.8 |
| le(cm) | 2.08 |
| Ve(cm3) | 0.257 |
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.
Ferrite Material Constants
Storage and Operating Temperature
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