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Toroids (5977000621)

Part Number: 5977000621
77 TOROID PLASTIC COATED
Medium Permeability, 77 (ui=2000) & 78 (ui=2300) materials
Inductive Components
Closed Magnetic Circuit
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Toroids

Part Number: 5977000621

77 TOROID PLASTIC COATED

Explanation of Part Numbers:
– Digits 1 & 2 = Product Class
– Digits 3 & 4 = Material Grade
•– 9th digit 1 = Parylene Coating, 2 = Thermo-Set Plastic Coating

A ring configuration provides the ultimate utilization of the intrinsic ferrite material properties. Toroidal cores are used in a wide variety of applications such as power input filters, ground-fault interrupters, common-mode filters and in pulse and broadband transformers.

•All toroidal cores are supplied burnished to break sharp edges.

Coating Options:
••– Toroids with an outside diameter of 9.5 mm (0.375″) or smaller can be supplied Parylene C coated. The Parylene coating will increase the “A” and “C” dimensions and decrease the “B” dimension a maximum of 0.038 mm (0.0015″). The ninth digit of a Parylene coated toroid part number is a “1”. See reference tables for the material characteristics of Parylene C. Parylene C coating is RoHS compliant.
•– Toroids with an outside diameter of 9.5 mm (0.375″) or larger can be supplied with a uniform coating of thermo-set plastic coating. This coating will increase the “A” and “C” dimensions and decrease the “B” dimension a maximum of 0.5 mm (0.020″). The 9th digit of the thermo-set plastic coated toroid part number is a “2”. Thermo-set plastic coating is RoHS compliant.
•– Thermo-set plastic coated parts can withstand a minimum breakdown voltage of 1000 Vrms, uniformly applied across the “C” dimension of the toroid.

•For any toroidal core requirement not listed in the catalog, please contact our customer service department for availability and pricing.

The “C” dimension may be modified to suit specific applications.

Weight: 6.4 (g)

Dimmmmm tolnominal inchinch misc.
A21.85Max0.86Max
B12.4Min0.489Min
C7.1Max0.279Max

Chart Legend
Σl/A  :  Core Constant,    le :  Effective Path Length,    Ae :  Effective Cross-Sectional Area,    Ve :  Effective Core Volume
AL :  Inductance Factor  

Electrical Properties
AL(nH)1270+25%, -30%
Ae(cm2)0.243
Σl/A(cm-1)21.3
le(cm)5.2
Ve(cm3)1.26

Toroids are tested for AL values at 10 kHz.

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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