nH (nano Henry)

μH (micro Henry)

mH (mili Henry)

 Lx mode
SMD or Small inductor with low parasitic capacitance.

 Large L mode
Large inductors with large parasitic capacitance.
single-shot measurements

Small inductors of less than 50uH (SMD inductors up to 500uH) have little parasitic capacitance and therefore do not affect the measurement.

The large parasitic capacitance of a bulky (winding) inductor affects the resonant frequency, which lowers the resonant frequency and is measured to be greater than the original inductance value. When measured in this Large L mode, this parasitic capacitance is removed and displayed.

#22 1Turn D=10mm

21 nH

Ls : 20.# nH

27 nH

5%  Coilcraft
1008HS-270T  2520

(SMD lead soldering)

28 nH
 

 

Notation in data sheet

Inductance measured using a Coilcraft SMD-A fixture in an Agilent/HP 4286A impedance analyzer with Coilcraft-provided correlation pieces.

Inductor of unknown value
(mm Scale)

57 nH
 

139 nH
 

Ls : 145.8 μH +1.25%

207 nH
 

Lp :228.8 nH  +4%
Ls : 221.1 nH
+0.9%

VE7003   7637
220 nH (0.22 μH)

218 nH
 

Lp :232 nH
Ls : 206.5 nH
+6%

MIL 270 nH 5%

270 nH (0.27 μH)

282 nH
 

Ls : 297.4 nH +3%
+ 9 nH

0.33μH  10%

331 nH
 

Ls : 350.2 nH
+7%

Solder point 424 nH 

Ls : 448.2 nH +4%
Probe unstable

460 nH
 

528 nH  +9%

 LC200A : 0.237 μH

Choke 0.5 uH

501 nH
 

Air Core

T106-0  0.3T  (29T)

1 uH

1.000 μH

1.02## μH  100kHz 1V

LC200A : 0.934 μH

1 uH  3%

1 uH   TDK

977 nH

1.058 μH
+8%

958 nH
 

Lp : 1.149 μH  +18%
Ls : 993.9nH
+2.7%

T37  #2

0.5mm 12T

PCB pattern Inductor

RFID Antenna Coil

PCB pattern Inductor

RFID Antenna Coil

Air Core
T106-0  0.3T  (31T)

2.015 μH

1.949# μH  100kHz 1V

LC200A : 2.005 μH

Coil with capacitor removed

2.289 μH
 

Lp : 3.941 μH
☞ 93.4pF 8.29MHz
Ls : 2.4629 μH
Ls : 2.3925 μH
+8%

Coil with capacitor removed

2.701 μH

Shield Coil +error
Ls :  3.5887 μH
+9%

3.255 μH

Ls : 3.3256 μH
+3%

3.470 μH

Ls : 3.5479 μH
+2%

2 μH

2.000 μH

Ls : 2.0907 μH
+4.5%

NYTT RFC-S  8736

2.2 μH  ±10%

2.196 μH
 

Ls : 2.2397 μH
+3.5%

MIL 2.2 μH   ±10%

2.2 μH  ±10%

2.303 μH
 

Lp : 2.902 μH
Ls : 2.3526 μH
+7%

2.7 μH

2.652 μH

Ls : 2.727# μH
100kHz +2.8%
Ls : 2.789 μH
10kHz +5.1%
Ls : 2.84 μH
1kHz +7%

MIL 2.7 μH   ±10%

2.525 μH
 

Ls : 2.6123 μH
+2.7%

3 μH No Marking

2.990 μH
 

Ls : 3.0282 μH
+1.7%

10k Bobin

2.008 μH

Ls : 2.0788μH 100kHz
+3.6%

2.493 μH

2.559 μH
Ls : 2.5585 μH
+2.6%

Variable Inductor

3.829 uH ~
6.505 μH

3.829 uH ~
 
~ 6.505 μH

6.319 μH
Ls : 6.2895 μH

T50-26   11T

Air Core
T106-0  0.5mm 49T

5 μH

5.000 μH

1.02## μH  100kHz 1V

LC200A : 0.934 μH

MIL 5.6 μH   ±10%

5.276 μH  
 

Ls : 5.2675 μH
+0.4%

6.128 μH

6.238 μH
Ls : 6.2280 μH
 +1.3%

LC200A : 5.314 μH

6.8 μH
 

7.356 μH

7.6833 μH

RF Choke 12cm

10 μH

10.26 μH

10.574 μH  +2.8%
100kHz

CK172026G10  18T
10 μH

CK172026G10  18T
10 μH

10.02 μH  684kHz
☆☆☆☆☆

Ls  10.089 μH 100kHz
+0.68%
(Z)Cp 가 적으면 오차 적음(-%)

Ls  10.126 μH 10kHz
+1%

Air Core
T106-0  0.5T (73T)

10 μH

9.212 μH (686kHz)
1.728nH/N²

Ls 9.5### μH
+2.7%

Air Core
T106-0  0.4T (84T)

9.8 μH

Ls 12.3## μH
+1.9%

12 μH SMD


12 μH

12.99 μH

13.258 μH
+1.8%

15 μH

15 μH

14.50 μH
 

14.826 μH
+1.9%

15 μH

15 μH

15.07 μH
 

15.343 μH
+1.8%

15μH

15 μH

14.84 μH
 

Ls 15.057 100kHz
+1.5%
Ls 15.084 10kHz
+1.7%

15 μH

15.11 μH
 

15.67 μH

Honeycomb winding


20 μH

20.01 μH
 

Ls 20.175 100kHz
+0.77%
Ls 20.174 10kHz
+0.77%

Air Core
T157-0  0.07*7 (123T)

26 μH

26.00 μH

Ls 26.1## μH
+0.3%

MIL 33 μH   ±5%

33 μH

31.28 μH
 

Ls : 31.221 μH
+0.03%

73-48   33 μH

33 μH

31.55 μH
 

33.62 μH
31.544

33 μH

32.76 μH
 

32.115 μH -1.2%

33 μH

32.29 μH
 

32.343 μH  -1.6%

39 μH

37.84 μH
◇◇◇◇◇

38.128 μH  +0.8%

T37#6

Lx Mode 43.30 μH
BOX
☆☆☆☆☆

Ls 43.37# 100kHz +0.16%
Ls 43.36# 10kHz +0.13%

Honeycomb winding


47 μH

Lx Mode 47.05 μH
☆☆☆☆☆

Ls 47.186 100kHz +0.28%
Ls 47.19710kHz +0.31%

Lx Mode 68.50 μH  516kHz
☆☆☆☆☆

Lp 68.182 μH  100kHz
Lp 68.380 μH  10kHz
Lp 74.37 μH   1kHz
 

Ls68.321 μH 100kHz -0.3%
Ls68.437 μH 10kHz -0.1%

82 μH

Lx Mode 83.41 μH

92.933 μH

RF Choke 15cm

90 μH  Choke

90 μH

MIL 91 μH   ±5%

91 μH

Lx Mode 84.93 μH

Ls 84.9## μH 10kHz -0.01%

MIL 100 μH   ±5%

Lx Mode 93.35 μH
☆☆☆☆☆

Ls 93.49 100kHz +0.15%
Ls 93.79 10kHz +0.47%

Mega Flex  59T
CK172026  101 μH

Lx Mode 101.0 μH   464kHz
☆☆☆☆☆
Large L Mode 101.0 μH  C+22nF 82kHz
00%%

Ls 100.61 μH  100kHz -0.38%
Ls 100.78 μH  10kHz-0.21%
Ls 101.48 μH 1kHz +0.47%

MK SI-100U-MPP
MPP CM203060   55T
100 μH

Large L Mode   100.0 μH     ☞  =
(Measurements with parasitic capacitance removed)

MPP Core
Ls  99.881 μH  100 kHz  1000mV

 LC200A : 99.61 μH -0.39%

*****  Small Size Coil *****
Lx mode  ↓  (Small Size Coil  Up to 10mH)
*****  Large (Air) Core Coil *****
 Large L mode  ↓

Air Core
100 μH   T184-0

Lx Mode 99.61 μH

Large L Mode 99.46 μH

MIL 120 μH   ±10%

120 μH


 

Lx Mode 121.9 μH


Large L Mode 121.6 μH
 

Ls 121.06 100kHz -0.36%
Ls 121.20 10kHz -0.24%
Ls 1 1kHz +%

T80#6

Lx Mode 151.3 μH
Lx Mode  151.3 μH  C+10nF

Large L Mode 152.3 μH  C+22nF 73kHz
-0.6%

Ls 150.15 100kHz+0.83%
Ls 150.17 100kHz+0.82%
Ls 150.1# μH 10kHz -0.7%

 + %  ↑
***** 200μH *****
 - %  ↓

Honeycomb winding

200 μH


 

Lx Mode 198.9 μH


Large L Mode 2198.1 μH
 

Ls : 197.38 μH 100kHz
-0.4%
Ls 198.76 μH 100kHz +0.28%
Ls 198.8# μH 10kHz +0.3%

MPP CM203060 + T37-6  30T

200 μH


 

Lx Mode   201.2 μH

Large L Mode   199.9 μH

Ls 198.73 μH  100kHz -0.47%
Ls 198.73 μH  10kHz -0.47%
Ls 199.01 μH  10kHz-0.35%
Ls 199.09 μH 1kHz -0.16%

220 μH

 10%  TDK
NLC453232T-221K

Large L Mode ≒ Lx Mode

The parasitic capacitance of the small coil does not significantly affect the resonant frequency.

Large L Mode

Lx Mode

MIL 220 μH  ±5%

220 μH

Coils with fewer turns have less parasitic capacitance and therefore less effect on the resonant frequency.

Lx Mode 215.1 μH 

212.8 μH
Ls : 211.86 -1.1%
Ls 213.03 μH 10kHz -0.5%

MIL 240 μH  ±5%

240 μH

Lx Mode 240.9 μH

Ls 238.76 100kHz -0.47%
Ls 239.7# 10kHz -0.08%
Ls 239.79 μH 10kHz -0.8%

(Z) Cp 가 적으면 -%

500μH
Vintage

500 μH


 

Lx Mode 503.2 μH

Large L Mode 507.4 μH
 

Ls 497.0# 100kHz -1.2%
Ls 499.### 10kHz -0.86%
Ls 498.9# μH 10kHz -0.8%

CPN 240-0073-00
MIL 0.5mH  6732
KWS-1, 51J-3

500 μH


 

Lx Mode 497.9 μH


Large L Mode 492.6 μH
 

Ls 487.8# 100kHz -0.96%
Ls 489.2# 10kHz -0.67%
Ls 489.3# μH 10kHz -0.6%

MIL 500 μH ?%

500 μH


 

Lx Mode 487.6 μH


Large L Mode 488.9 μH
 

Lp : 480.9 μH
Ls : 479.75 μH -1.2%
Ls 480.## μH 100kHz -%
Ls 481.0# μH 10kHz -0.9%

680 μH SMD

680 μH


 
Although it is small, it has a large number of windings, so the parasitic capacitance is large, and the effect on the resonance frequency is large.

Lx Mode 676.0 μH
The more turns an SMD inductor has, the greater its parasitic capacitance.


Large L Mode  666.6 μH
 

661.2x μH  -1.4%
Ls 664.## μH 10kHz -1.1%

680 μH 10%
680 μH

644.3 μH

643.3# μH -0.6%
Ls  mH 10kHz -%

MIL 1 mH   ±10%

1 mH


 

Lx Mode 913.7 μH


Large L Mode  907.3 μH
 

899.73 μH -10%
Ls 0.907# mH 10kHz -0.7%

High flux CH330060
SRF:922kHz  Cp : 30pF
1 mH

1 mH

Large L Mode 997.2 μH  C+22nF 32kHz
-2.0%

Ls 991.6# 100kHz
Lp 991.26 10kHz  -0.5%
Ls 990.87 10kHz

1.2 mH

1.2 mH


 

Lx Mode  1.122 mH

Large L Mode  1.099 mH
 

Ls 1.0949 100kHz
-1.49%
Lp 1.AA    10kHz -%
Ls 1.108# 10kHz -0.18%

MIL 2 mH   ±10%

2 mH


 

Lx Mode  1.958 mH


Large L Mode 1.928 mH
 

Ls 1.9242 100kHz
-1.5%
Lp 1.966# 10kHz +0.3%
Ls 1.9244 10kHz -1.9%
-1.5%

High flux CH330060 +
SRF:609kHz  Cp : 14pF
Air Core 2 mH
2 mH


 

Lx Mode 2.018 mH   132kHz
Large L Mode 1.964 mH  C+22nF 23kHz
-2.7%

Ls 1.9608 100kHz
Lp 1.9534 10kHz  -0.5%
Ls 1.9508 10kHz

MPP CM400125
SRF:322kHz  Cp : 48pF
5 mH


 

Lx Mode 5.262 mH   82kHz
Large L Mode  5.006 mH  C+22nF 14kHz
-5.1%

Lp 5.271# 100kHz
20kHz ???
Lp 4.968# 10kHz
Lp 4.9836 1kHz  -0.44%
600Hz ???
Ls 5.398# mH 120Hz

Honeycomb winding
Choke 8mH

8 mH



 

The honeycomb coil also has a large parasitic capacitance when the number of turns is large and has a large effect on the resonant frequency.

Lx Mode  8.002 mH
(Measurements including parasitic capacitance)


Large L Mode   7.812 mH
(Measurements with parasitic capacitance removed)

Ls 7.895# 100kHz -0.2%
Lp 7.835# 10kHz/ -0.5%
Ls 7.760# 10kHz/ -1.5%
Ls. 7.7672 1kHz -1.4%
 23℃

8.2mH

8.2 mH


 

Lx Mode  8.288 mH
(Measurements including parasitic capacitance)

Large L Read   8.093 mH
(Measurements with parasitic capacitance removed)

Lp 8.00## 100kHz
+0.3%
Lp  8.32## mH 10kHz
Ls  8.132# mH 100kHz +1.4%
Ls  8.217# mH 10kHz

MIL 10 mH   ±10%

10 mH



 

Lx Mode  10.08 mH
(Measurements including parasitic capacitance)



Large L Mode   9.871 mH
(Measurements with parasitic capacitance removed)

Lp 9.908 100kHz +0.3%
Lp  10kHz  <<<<<
Ls 9.91## 100kHz  -1.4%

Reed Relay Coil
SRF:203kHz  Cp:27pF


 

Lx Mode 16.59 mH  Finding the cause of small values in Lx mode


Large L Mode   17.29 mH

18.92mH 10kHz
Lp  48.88# mH 1kHz -%
Ls  19.756 mH 1kHz -2.2%

Line Filter


 

Lx Mode 40.10 mH  (59kHz)  +1.7%
mH Mode 39.40 mH  C+10nF
Large L Mode 39.95 mH  C+22nF 5kHz
+0.3%

Lp 39.517 mH  10kHz -1%
Ls 39.519 mH  10kHz -1%
Ls 42.8## mH  1kHz %

 Ls mode  ↑
4263B ***** 47 mH *****
 Lp mode  ↓

Line Choke Serial


 

mH Mode 68.00 mH  C+10nF 5kHz
① Large L Mode 60.98 mH  C+22nF 4kHz
△
② Large L Mode 68.52 mH  C+22nF 4kHz
Low Frequency Core ???
-0.7%

① Lp 63.1## mH 10kHz +3%
Lp 73.6## mH 1kHz
② Lp 71.0## mH 10kHz +3.6%
Lp 82.84# mH 1kHz %

Green Ferrite (Mn-Zn)

104 mH


 

Lx Mode 111.8 mH   17kHz

Large L Mode  104.1 mH

Lp 110.6# mH 10kHz -2.8%
Q : 73
Ls 107.66 mH 10kHz

Marantz  110mH
SRF:44.91kHz
Cp ≒ 112 pF


 

Lx Mode  122.2 mH
(Measurements including parasitic capacitance)

Large L Mode   110.1 mH
(Measurements with parasitic capacitance removed)

112.69 mH -7%  10kHz
111.63 mH -%  1kHz
Lp 111.6# mH 1kHz -1%
Ls 111.4# mH 1kHz -1.2%

Solid #22  ≒ 300m

175 mH


 

Lx Mode Purple 205.2 mH

Large L Mode  175.8 mH

Lp 177.7# mH 1kHz -2.4%
Ls 177.5# mH 1kHz -2.5%
 Q:34
Because of the parasitic capacitance of the capacitor

The parasitic capacitance increases, and the shield case inductor has more errors.