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U Cores (9277012002)

Part Number: 9277012002
77 U CORE
MnZn 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)

Dimmmmm tolnominal inchinch misc.
A41.15±0.751.62_
B25.4±0.151_
C11.7±0.250.46_
D15.75Min0.62Min
E18.65Min0.735Min
F35.3±0.601.39_

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 0.7
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.

Ferrite Material Constants

Specific Heat
0.25 cal/g/°C
Thermal Conductivity
3.5 - 4.5 mW/cm-°C
Coefficient of Linear Expansion
8 - 10x10-6/°C
Tensile Strength
4.9 kgf/mm2
Compressive Strength
42 kgf/mm2
Young's Modulus
15x103 kgf/mm2
Hardness (Knoop)
650
Specific Gravity
≈4.7 g/cm3
The above quoted properties are typical for Fair-Rite MnZn and NiZn ferrites.


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