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« Back PDF (Print) 5.220 in. / 133.00 mm OD Toroid

MS - 521 125 - 2

Physical Dimensions
OD Bare Core Nominal 132.54 mm 5.218 in
Coated Core (max) 134.21 mm 5.284 in
ID Bare Core Nominal 78.59 mm 3.094 in
Coated Core (min) 77.04 mm 3.033 in
Ht Bare Core Nominal 25.40 mm 1.000 in
Coated Core (max) 26.80 mm 1.055 in
Magnetic Dimensions
Ae Effective Magnetic Cross Section 6.71 cm2
Le Effective Magnetic Path Length 32.4 cm 
Ve Effective Core Volume 218 cm3
WA Minimum Effective Window Area 46.6 cm2
SA Surface Area 540 cm2
MLT Mean Length Per Turn 14.9 cm 
Permeability Part Numbers
Reference
Permeability
AL Value
(nH/N2)
MS
Sendust
SH
High Freq. Sendust
MPP
Molypermalloy
FluxSan
Silicon Iron
Hi-Flux
Nickle Iron
Optilloy
Optimized Alloy
14μ 36.4 MS-521014-2 MP-521014-2 FS-521014-2 HF-521014-2 OP-521014-2
26μ 67.6 MS-521026-2 MP-521026-2 FS-521026-2 HF-521026-2 OP-521026-2
40μ 104 MS-521040-2 FS-521040-2 OP-521040-2
60μ 156 MS-521060-2 MP-521060-2 FS-521060-2 HF-521060-2 OP-521060-2
75μ 195 MS-521075-2 FS-521075-2 OP-521075-2
90μ 234 MS-521090-2 OP-521090-2
125μ 325 MS-521125-2 MP-521125-2 HF-521125-2 OP-521125-2
147μ 382 MP-521147-2 HF-521147-2
160μ 416 MP-521160-2
173μ 450 MP-521173-2
Approx Unit Weight: 1,260 g 1,218 g 1,624 g 1,482 g 1,498 g 1,448 g
Test Conditions
Winding N=200, #18 AWG
Frequency 10 kHz
Voltage 6.0 V
AL Tolerance ±8%
Coating/Packaging Information
Coating Type Blue Epoxy
Voltage Breakdown 1000 Vrms
Unit 0.1 mA, 5 s
Package Quantity 4 Pcs/Box
Winding Table
Wire Size AWG 8 10 12 14 16 18 20 22 24 26 28
mm 3.150 2.500 2.000 1.600 1.250 1.000 0.800 0.630 0.500 0.400 0.315
Single
Layer
Turns 62 78 98 123 154 192 239 298 372 463 577
Rdc(Ω) 19.0 m 38.1 m 76.1 m 151.9 m 302.4 m 599.6 m 1.2 2.4 4.7 9.3 18.3
Full
Winding
Turns 244 378 584 905 1,400 2,167 3,354 5,191 8,035 12,436 19,248
Rdc(Ω) 74.9 m 184.5 m 453.4 m 1.1 2.7 6.8 16.7 41.0 100.9 248.5 611.6