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Rods (4077312911)

Part Number: 4077312911
77 ROD
Medium Permeability, 77 (ui=2000) & 78 (ui=2300) materials
Inductive Components
Open Magnetic Circuit
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Part Number: 4077312911

77 ROD

Explanation of Part Numbers:
– Digits 1 & 2 = Product Class
– Digits 3 & 4 = Material Grade

Pressed Fair-Rite rods are used extensively in high-energy storage designs.

These rods can also be used for inductive components that require temperature stability or have to accommodate large dc bias requirements.

Figure 2 rods have a 0.6 mm (0.024”) maximum chamfer on the end faces.

For frequency tuned rod designs see section “Antenna/RFID Rods”.

•For any rod requirement not listed here, feel free to contact our customer service group for availability and pricing.

The “A” dimension can be centerless ground to tighter tolerances.

Weight: 9.2 (g)

Dimmmmm tolnominal inchinch misc.

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




77 Material Characteristics
Property Unit Symbol Value
Initial Permeability @ B < 10 gauss µi 2000
Flux Density @ Field Strength Gauss
Residual Flux Density Gauss Br 1800
Coercive Force Oersted Hc 0.25
Loss Factor @ Frequency 10 -6
Tan δ/ µi 15
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)
Specific Gravity
≈4.7 g/cm3
The above quoted properties are typical for Fair-Rite MnZn and NiZn ferrites.

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