U Cores (9077025002)
77 U CORE
77 Material
Inductive Components
Closed Magnetic Circuit
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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)
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.
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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