U Cores (9077002002)
77 U CORE
MnZn 77 material
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.|
•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
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:
77 Material Characteristics
|Initial Permeability @ B < 10 gauss||µi||2000|
|Flux Density @ Field Strength||Gauss
|Residual Flux Density||Gauss||Br||1800|
|Loss Factor @ Frequency||10 -6
|Tan δ/ µi||15
|Temperature Coefficient of Initial Permeability (20 -70°C)||%/°C||1.2|
**** 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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