U Cores (9277012002)
77 U CORE
77 Material
Inductive Components
Closed Magnetic Circuit
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Part Number: 9277012002
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: 66 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 41.70 | ±0.85 | 1.62 | _ |
| B | 25.4 | ±0.15 | 1 | _ |
| C | 11.65 | ±0.25 | 0.461 | _ |
| D | 15.75 | Min | 0.621 | Min |
| E | 18.65 | Min | 0.735 | Min |
| F | 35.65 | ±0.75 | 1.39 | _ |
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) | 1255 Min |
| Ae(cm2) | 0.98 |
| Σl/A(cm-1) | 13.8 |
| le(cm) | 13.5 |
| Ve(cm3) | 13.2 |
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.
A MnZn ferrite for use in a wide range of high and low flux density inductive designs for frequencies up to 100 kHz.
Available in 77 material:
Pot Cores
E&I Cores
U Cores
Rods
Toroids
Bobbins
77 Material Characteristics
| Property | Unit | Symbol | Value |
| Initial Permeability @ B < 10 gauss | µi | 2000 | |
| Flux Density @ Field Strength | Gauss Oersted |
B H |
5100 5 |
| Residual Flux Density | Gauss | Br | 1800 |
| Coercive Force | Oersted | Hc | 0.25 |
| Loss Factor @ Frequency | 10 -6 MHz |
Tan δ/ µi | 15 0.1 |
| Temperature Coefficient of Initial Permeability (20 -70°C) | %/°C | 1.2 | |
| Curie Temperature | °C | Tc | >200 |
| Resistivity | ohm-cm | ρ | 100 |
**** Characteristic curves are measured on standard Toroids (18/10/6 mm) at 25°C and 10 kHz unless otherwise indicated. Impedance characteristics are measured on standard shield beads (3.5/1.3/6.0 mm) unless otherwise indicated.
Material Safety Data Sheet (MSDS)
Click here to download Complex Permeability vs. Frequency (CSV)
Ferrite Material Constants
Storage and Operating Temperature
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