Document 158 SPICE Model – 0603CS 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 0603CS Chip Inductors R1 ⏲) Part number (⏲ 0603CS-1N6 0603CS-1N8 0603CS-2N2 0603CS-3N3 0603CS-3N6 0603CS-3N9 0603CS-4N3 0603CS-4N7 0603CS-5N1 0603CS-5N6 0603CS-6N8 0603CS-7N5 0603CS-8N2 0603CS-8N7 0603CS-9N5 0603CS-10N 0603CS-11N 0603CS-12N 0603CS-15N 0603CS-16N 0603CS-18N 0603CS-22N 0603CS-23N 0603CS-24N 2 2 23 12 9 9 9 10 12 5 11 12 16 5 10 35 25 9 10 11 11 13 18 15 R2 ⏲) (⏲ C (pF) L (nH) 0.001 0.001 0.070 0.002 0.002 0.002 0.003 0.003 0.004 0.075 0.005 0.006 0.008 0.011 0.011 0.010 0.013 0.013 0.040 0.050 0.050 0.050 0.050 0.040 0.030 0.035 0.024 0.032 0.040 0.042 0.043 0.042 0.053 0.029 0.041 0.045 0.059 0.069 0.038 0.043 0.046 0.058 0.049 0.050 0.071 0.054 0.054 0.068 1.6 1.8 2.2 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.8 7.5 8.0 8.7 9.5 10.0 11.0 12.0 15.0 16.0 18.0 21.9 23.0 24.0 k Upper limit (MHz) R1 ⏲) Part number (⏲ 6.50E-06 1.00E-05 11.22E-06 8.90E-06 1.25E-05 1.40E-05 1.31E-05 1.99E-05 2.08E-05 1.62E-05 1.89E-05 2.04E-05 2.18E-05 2.40E-05 2.96E-05 2.64E-05 2.88E-05 3.20E-05 3.60E-05 3.80E-05 4.10E-05 4.80E-05 4.91E-05 5.03E-05 25300 22100 23000 17100 14600 13700 12900 12500 10700 10600 10500 9600 8100 7200 9300 8500 7800 6700 6500 6200 5400 5600 5500 4800 0603CS-27N 0603CS-30N 0603CS-33N 0603CS-36N 0603CS-39N 0603CS-43N 0603CS-47N 0603CS-51N 0603CS-56N 0603CS-68N 0603CS-72N 0603CS-82N 0603CS-R10 0603CS-R11 0603CS-R12 0603CS-R15 0603CS-R18 0603CS-R20 0603CS-R21 0603CS-R22 0603CS-R25 0603CS-R27 0603CS-R33 0603CS-R39 17 19 16 23 17 27 17 30 17 17 20 20 25 21 26 30 33 20 22 28 33 34 37 41 R2 ⏲) (⏲ C (pF) L (nH) 0.030 0.020 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.010 0.025 0.050 0.125 0.150 0.168 0.200 0.300 0.676 1.052 0.049 0.062 0.081 0.059 0.066 0.055 0.071 0.050 0.065 0.073 0.054 0.056 0.060 0.060 0.063 0.068 0.061 0.048 0.045 0.058 0.044 0.054 0.059 0.059 27.0 30.0 33.0 35.7 39 43 47 51 56 67 72 81 100 109 119 148 179 198 208 219 246 268 327 386 Specifications subject to change without notice. © Coilcraft, Inc. 2009 k 5.75E-05 6.13E-05 8.00E-05 7.22E-05 9.00E-05 9.50E-05 1.03E-04 1.17E-04 1.18E-04 1.45E-04 1.60E-04 1.65E-04 2.34E-04 2.57E-04 2.70E-04 3.57E-04 3.87E-04 4.17E-04 4.29E-04 4.53E-04 4.22E-04 5.30E-04 7.19E-04 7.69E-04 Upper limit (MHz) 5300 4500 3700 4200 3800 4000 3400 3800 3200 2800 3100 2900 2500 2400 2300 2000 1900 2000 2000 1700 1700 1600 1400 1300 Document 158-3 Revised 04/05/04