Shapes/Sizes Available

« Back PDF (Print) 4.000 in. / 102.00 mm OD Toroid

MS - 400 125 - 2

Physical Dimensions
OD Bare Core Nominal 101.60 mm 4.000 in
Coated Core (max) 102.87 mm 4.050 in
ID Bare Core Nominal 57.15 mm 2.250 in
Coated Core (min) 55.75 mm 2.195 in
Ht Bare Core Nominal 16.51 mm 0.650 in
Coated Core (max) 17.78 mm 0.700 in
Magnetic Dimensions
Ae Effective Magnetic Cross Section 3.52 cm2
Le Effective Magnetic Path Length 24.3 cm 
Ve Effective Core Volume 85.5 cm3
WA Minimum Effective Window Area 24.4 cm2
SA Surface Area 303 cm2
MLT Mean Length Per Turn 11.1 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 25.6 MS-400014-2 MP-400014-2 FS-400014-2 HF-400014-2 OP-400014-2
26μ 47.4 MS-400026-2 SH-400026-2 MP-400026-2 FS-400026-2 HF-400026-2 OP-400026-2
40μ 75 MS-400040-2 FS-400040-2 OP-400040-2
60μ 112 MS-400060-2 SH-400060-2 MP-400060-2 FS-400060-2 HF-400060-2 OP-400060-2
75μ 137 MS-400075-2 FS-400075-2 OP-400075-2
90μ 164 MS-400090-2 FS-400090-2 OP-400090-2
125μ 228 MS-400125-2 SH-400125-2 MP-400125-2 HF-400125-2 OP-400125-2
147μ 268 MS-400147-2 MP-400147-2 HF-400147-2
160μ 282 MS-400160-2 MP-400160-2
173μ 316 MP-400173-2
Approx Unit Weight: 494 g 478 g 637 g 581 g 587 g 568 g
Test Conditions
Winding N=140, #18 AWG
Frequency 10 kHz
Voltage 2.2 V
AL Tolerance ±8%
Coating/Packaging Information
Coating Type Blue Epoxy
Voltage Breakdown 1000 Vrms
Unit 0.1 mA, 5 s
Package Quantity 16 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 44 56 70 88 110 138 172 215 268 335 417
Rdc(Ω) 10.0 m 20.2 m 40.2 m 80.5 m 160.0 m 319.2 m 632.7 m 1.3 2.5 5.0 9.8
Full
Winding
Turns 128 198 306 474 733 1,135 1,756 2,719 4,208 6,512 10,079
Rdc(Ω) 29.1 m 71.6 m 175.9 m 433.4 m 1.1 2.6 6.5 15.9 39.1 96.4 237.2