Question

2. Find the component body dimensions of: (i) 1/4W axial leaded resistor (ii) 0402 SMD resistor Assume that these elements will be used in an RF circuit with sinusoidal excitation. Also, assume the velocity of propagation across the elements is equal to 0.6c, where c = 3e8 m/s. For each component, compute the upper frequency below which it can safely be considered to be a lumped element. Use the lambda versus component body size criterion. Useful Information: Transit time effect can be safely ignored if the length of the transmis- sion line is less than 1% of the signal wavelength.

Answer 1

Axial leaded resistor Lead Lead Power rating | Body length Body diametreld) diameteldo) length cas mm mm mm watt mm 1.8£0-3 3.040.3 2813 0.45to.5 0-6 +0.05 1860-125) 74 695) 1200:5 2.5 10:3 2843 2813 9873 6.570.5 8.5+0:5 II+ 06+0.05 3.210.3 0.8t0.05 5 to 5 widthew Height(b) Power I Length Code SMD I Resistor Imperial / Metric watt 4 anch inch mm mm mm inch 0603 0.024 020) 10402 1005 0603 106 10.012 0.3 0.0110.25%2C0.07 TLO 100 TO 10.014 0.35761 [Co.062) 11.55 10.03 10.85 p.01810:45:00 2.0 10.05 12 100180-4548 10-0180-4960.125) 3.2 006 1 1.6 16.99 0.55 4) 3.2 10.10 12.5 100/oss 1/2 13.2 10.18 14.6 0.22 0.55 0.04 11608 0.06 2012 0.08 3216 0.12 3225 0.12 3246 1 0.12 0805 1206 [1210 1812

The size of Anial Resistoss s not standard lized Dibterent manufacturers may used slighlly different while SMD are standandized. CUC DEC Steindands) far to watt Axial leaded Desistor Length - Lead Body 128 mm Diameter : 6.5mm 06 mm ba? 2.5 mm for lumped element intosmation As per given I have length) of No dimension Resistos will increase On this case: lead: length :=28mm was marimum in all four dimensions. 5. 28x103 have length (d) 10 Az o.28m : frequency (P) & 067 -06 * 3X10%. 0.28 - Giuxlo 412 This' 6.4x108 42 was upper frequency Now for SMD (0402) series. pad length = lomm pad wildth = 0. 5mm -0.5mm Gap

In this case: Manimum dimension was Imm= 1xcom. idz 1X163 m 2010 dz 1x162m Now frequency (f) I o.be = 0.6 X 3x108 - 1x102 - 118x1010 10 HZ for Lumped element frequency was 1,8 x 10 Upper