SPICE

Document 158
SPICE Model – 1008HS
This lumped-element (SPICE) model data simulates the
frequency-dependent behavior of Coilcraft RF surface
mount inductors from 1 MHz to the upper frequency limit
shown in the accompanying table.
The equivalent lumped element model schematic is
shown below. The element values R1, R2, C, and L are
listed for each component value. The value of the frequency-dependent variable resistor RVAR relates to the
skin effect and is calculated from:
RVAR = k *
•
•
k is shown for each value in the accompanying table.
f is the frequency in Hz
The data represents de-embedded measurements, as
described below. Effects due to different customer circuit
board traces, board materials, ground planes or interactions with other components are not included and can
have a significant effect when comparing the simulation
to measurements of the inductors using typical production verification instruments and fixtures.
Each model should only be analyzed at the input and
output ports. Individual elements of the model are not
determined by parameter measurement. The elements
are determined by the overall performance of the lumped
element model compared to the measurements taken of
the component.
Typically, the Self-Resonant Frequency (SRF) of the
component model will be higher than the measurement of
the component mounted on a circuit board. The parasitic
reactive elements of a circuit board or fixture will effectively
lower the circuit resonant frequency, especially for very
small inductance values. Since data sheet specifications
are based on typical production measurements, and the
SPICE models are based on de-embedded measurements as described below, the model results may be
different from the data sheet specifications.
Lumped Element Modeling Method
The measurements were made over a brass ground
plane with each component centered over an air gap, as
illustrated in Figure 1. The gap width for each size
component is given in Table 1. The test pads were 30 mil
Table 1. Test Gap
Size
0302
0402,0403
0603
0805
1008
1206
1812
Gap Width (inch / mm)
0.017 / 0.432
0.017 / 0.432
0.026 / 0.660
0.040 / 1.016
0.060 / 1.524
0.080 / 2.032
0.120 / 3.048
(50 Ohm) wide traces of tinned gold over 25 mil thick
alumina, and were not included in the gap. The TRL*
calibration plane is also illustrated in Figure 1.
Pad
Pad
Brass
ground
plane
Calibration
plane
Figure 1. Test Setup
The lumped element values were determined by matching
the simulation model to an average of the measurements. This method results in a model that represents as
closely as possible the typical frequency-dependent behavior of the component up to a frequency just above the
self-resonant frequency of the model.
The lumped element models were used to generate our
2-port S-parameters and therefore give identical results. The S-parameters are available on our web site
at http://www.coilcraft.com/models.cfm.
Disclaimer
Coilcraft makes every attempt to provide accurate measurement data and software, representative of our components, in a usable format. Coilcraft, however, disclaims
all warrants relating to the use of its data and software,
whether expressed or implied, including without limitation
any implied warranties of merchantability or fitness for a
particular purpose. Coilcraft cannot and will not be liable
for any special, incidental, consequential, indirect or
similar damages occurring with the use of the data and/
or software.
Specifications subject to change without notice.
© Coilcraft, Inc. 2009
Air gap
Document 158-1 Revised 03/16/09
Document 158
SPICE Model for Coilcraft 1008HS Chip Inductors
R1
⏲)
Part number (⏲
1008HS-100
1008HS-120
1008HS-150
1008HS-180
1008HS-220
1008HS-270
1008HS-330
1008HS-390
1008HS-470
1008HS-560
1008HS-680
1008HS-820
1008HS-101
1008HS-121
8
7
7
7
8
8
9
9
9
7
6
12
13
13
R2
⏲)
(⏲
C (pF)
L (nH)
0.10
0.10
0.10
0.10
0.10
0.10
0.10
0.20
0.20
0.20
0.20
0.20
0.60
0.60
0.065
0.100
0.153
0.083
0.124
0.185
0.117
0.149
0.118
0.160
0.137
0.179
0.135
0.136
9.8
12.0
15.0
18.0
22.0
27.0
33.0
39.0
47.0
56.0
68.0
81.0
100
120
k
1.96E-05
2.40E-05
3.12E-05
3.16E-05
3.69E-05
4.41E-05
5.18E-05
5.50E-05
6.40E-05
7.40E-05
9.20E-05
1.15E-04
1.25E-04
1.51E-04
Upper
limit
(MHz)
6700
4900
3700
4600
3400
2500
2900
2300
2400
1900
1900
1500
1600
1400
R1
⏲)
Part number (⏲
1008HS-151
1008HS-181
1008HS-221
1008HS-271
1008HS-331
1008HS-391
1008HS-471
1008HS-561
1008HS-621
1008HS-681
1008HS-751
1008HS-821
1008HS-911
1008HS-102
14
18
18
19
20
27
31
36
37
37
44
41
53
90
R2
⏲)
(⏲
C (pF)
L (nH)
0.70
0.80
0.80
0.90
1.10
1.10
1.20
1.30
1.40
1.50
1.50
1.60
1.70
1.80
0.136
0.130
0.147
0.144
0.132
0.138
0.156
0.172
0.143
0.139
0.138
0.135
0.155
0.209
150
180
224
265
330
380
465
550
615
665
740
810
895
975
Specifications subject to change without notice.
© Coilcraft, Inc. 2009
k
Upper
limit
(MHz)
1.10E-04
1.40E-04
1.90E-04
2.32E-04
2.84E-04
3.49E-04
4.27E-04
5.18E-04
5.74E-04
6.10E-04
6.90E-04
8.10E-04
7.80E-04
8.20E-04
1300
1200
1000
900
900
800
700
600
600
600
600
600
500
400
Document 158-12 Revised 11/13/02