Part Number: 5978002721
78 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.
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) | 2545+25%, -30% |
| Ae(cm2) | 0.79 |
| Σl/A(cm-1) | 11.2 |
| le(cm) | 8.9 |
| Ve(cm3) | 7 |
Toroids are tested for AL values at 10 kHz.
A MnZn ferrite specifically designed for power applications for frequencies up to 200 kHz and low loss inductive applications to 500 kHz.
Available in 78 material:
RFID Rods
Toroids
Mated Parts
78 Material Characteristics
| Property |
Unit |
Symbol |
Value |
| Initial Permeability @ B < 10 gauss |
|
µi |
2300 |
| Flux Density @ Field Strength |
Gauss
Oersted |
B
H |
4800
5 |
| Residual Flux Density |
Gauss |
Br |
1500 |
| Coercive Force |
Oersted |
Hc |
0.20 |
| Loss Factor @ Frequency |
10 -6
MHz |
Tan δ/ µi |
3
0.1 |
| Temperature Coefficient of Initial Permeability (20 -70°C) |
%/°C |
|
1.0 |
| Curie Temperature |
°C |
Tc |
>200 |
| Resistivity |
ohm-cm |
ρ |
200 |
**** 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
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.
