# 50 Ohm Trace Width Calculator

PCB manufacturer normally provides information about PCB stackup and track geometry.

Microstrip Width Calculator Microstrip Width Formula,equation. This page covers Microstrip Width Calculator. It mentions formula or equations used in this Microstrip Width Calculator. The figure-1 above depicts microstrip line. Refer types of microstrip line and basics of microstrip line for more information. I came up with a trace width of 0.8mm and gap of 0.15mm. The standard Molex edge mount SMA footprint also needed some modification adding a clearout on the bottom ground layer under the center pin. The vendor was JLCPCB using their FR4, 1.66mm process. It does calculate to an Er of 5.4 or 5.5. At some point I'll dig further into this.

In case you need to calculate single ended or differential pair impedance on your PCB, try following links:

I use Microstrip & Stripline calculator developed by Jean Nicolle
http://www.jnicolle.com/?page=LVDS

## 50 Ohm Pcb Trace

or try this Online PCB impedance calculator at
http://www.skottanselektronik.com/
This link also has a track maximum current calculator, crosstalk calculator and thermal via calculator.

One of the bests is this FREE Saturn PCB Design Toolkit:
http://www.saturnpcb.com/pcb_toolkit.htm

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This online PCB impedance calculator helps to calculate stripline impedance. Stripline is a transverse electromagnetic (TEM) transmission line medium which can be fabricated using printed circuit boards (PCB). Stripline PCB Impedance is expressed using Ohm. Propagation delay is the amount of time it takes for the head of the signal to travel from the sender to the receiver. Use Stripline Impedance Calculator to find the PCB Impedance, capacitance, propagation delay and inductance

## 50 Ohm Impedance

This online PCB impedance calculator helps to calculate stripline impedance. Stripline is a transverse electromagnetic (TEM) transmission line medium which can be fabricated using printed circuit boards (PCB). Stripline PCB Impedance is expressed using Ohm. Propagation delay is the amount of time it takes for the head of the signal to travel from the sender to the receiver. Use Stripline Impedance Calculator to find the PCB Impedance, capacitance, propagation delay and inductance

#### Formula:

z = 60 / (√(e)) x LN((1.92 x (2 x h + t)) / (0.8 x w + t))c = (5.55 x 10-11 x e) / (LN((3.81 x h) / (0.8 x w + t)))p = 3.34 x 10-9 x √(e)l = c x z x zWhere,e = Relative permittivity of the dielectricm = Height of dielectrich = Height of tracez = Characteristic impedancew = Width of the tracet = Trace thicknessc = Capacitance per unit lengthp = Effective propagation delayl = Inductance per unit length

### Example

Consider PCB stripline trace of width 10cm, thickness 6 cm and height 15 cm with relative permittivity of 31. Find the impedance

#### Characteristic Impedance

= 60 / (√(31)) x ln((1.92 x (2 x 15 + 6)) / (0.8 x 10 + 6))
= 17.2075 ohm

#### Capacitance Per Unit Length

= (5.55 x 10^-11 x 31) / (ln((3.81 x 15) / (0.8 x 10 + 6)))
= 1.2231 x e-9 F/m

#### Effective Propagation Delay

= 3.34 x 10^-9 x √(31)
= 1.859 x e-8 s/m

#### Inductance Per Unit Length

= 1.2231 x e-9 x (17.2075)2
= 3.621 x e-7 H/m

Stripline PCB Impedance is the complex ratio of the voltage to the current in an electrical circuit. Inductance in an electric circuit causes an electromotive force to be generated by a change in the current flowing. Capacitance is the capacity of an electric circuit to store an electric charge.

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