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« Back PDF (Print) 0.400 in. / 10.20 mm OD Toroid

MS - 040 125 - 2

Physical Dimensions
OD Bare Core Nominal 10.16 mm 0.400 in
Coated Core (max) 10.80 mm 0.425 in
ID Bare Core Nominal 5.08 mm 0.200 in
Coated Core (min) 4.57 mm 0.180 in
Ht Bare Core Nominal 3.96 mm 0.156 in
Coated Core (max) 4.57 mm 0.180 in
Magnetic Dimensions
Ae Effective Magnetic Cross Section 0.1 cm2
Le Effective Magnetic Path Length 2.38 cm 
Ve Effective Core Volume 0.238 cm3
WA Minimum Effective Window Area 0.164 cm2
SA Surface Area 4.2 cm2
MLT Mean Length Per Turn 1.77 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 7 MS-040014-2 MP-040014-2 FS-040014-2 HF-040014-2 OP-040014-2
26μ 14 MS-040026-2 SH-040026-2 MP-040026-2 FS-040026-2 HF-040026-2 OP-040026-2
40μ 21 MS-040040-2 FS-040040-2 OP-040040-2
60μ 32 MS-040060-2 SH-040060-2 MP-040060-2 FS-040060-2 HF-040060-2 OP-040060-2
75μ 40 MS-040075-2 FS-040075-2 OP-040075-2
90μ 48 MS-040090-2 FS-040090-2 OP-040090-2
125μ 66 MS-040125-2 SH-040125-2 MP-040125-2 HF-040125-2 OP-040125-2
147μ 78 MS-040147-2 MP-040147-2 HF-040147-2
160μ 84 MS-040160-2 MP-040160-2 HF-040160-2
173μ 92 MP-040173-2
205μ 105 MP-040205-2
Approx Unit Weight: 1.4 g 1.3 g 1.8 g 1.6 g 1.6 g 1.6 g
Test Conditions
Winding N=55, #30 AWG
Frequency 10 kHz
Voltage 0.024 V
AL Tolerance ±8% (±12% Super-MSS)
Coating/Packaging Information
Coating Type Blue Epoxy
Voltage Breakdown 1000 Vrms
Unit 0.1 mA, 5 s
Package Quantity 9,000 Pcs/Box
Winding Table
Wire Size AWG 20 22 24 26 28 30 32 34 36 38 40
mm 0.800 0.630 0.500 0.400 0.315 0.250 0.200 0.160 0.125 0.100 0.080
Single
Layer
Turns 12 15 19 25 32 40 50 63 80 100 125
Rdc(Ω) 7.0 m 14.0 m 28.2 m 59.1 m 120.3 m 239.1 m 475.2 m 952.3 m 1.9 3.8 7.6
Full
Winding
Turns 12 18 28 44 68 105 162 251 389 602 931
Rdc(Ω) 7.0 m 16.8 m 41.6 m 104.0 m 255.5 m 627.5 m 1.5 3.8 9.4 23.0 56.6