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USB/RS232 Breakout Board

a.k.a. BoB

USB/RS232 Breakout Board
In the September 2011 issue Elektor published a USB/serial converter that was remarkable not only for its great technical characteristics, but also for its tiny dimensions. On thats break-out-board ('BoB') an FT232RQ was used, a USB/UART chip from (what'ye think...) FTDI. Now, eight years on, we considered it's time for an update, which we present to you here.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list

Component List


Default: SMD 0603

R1,R8 = 0Ω, 75V/100mW
R2,R3 = 27Ω, 75V/100mW
R4 = 10kΩ, 50V/100mW
R5 = 15kΩ, 50V/100mW
R6,R7 = 270Ω, 50V/100 mW


Default: SMD 0603
C1,C5 = 10nF, 50V, 20%, X7R
C2,C3 = 47pF, 50V, 2%, C0G/NP0
C4,C7,C8 = 100nF, 50V, 10 %, X7R
C6 = 4.7µF, 6.3V, 10%, X5R

L1,L2 = 330Ω @ 100MHz, 1.7A, 0.08Ω (Murata BLM18KG331SN1D)

D1 = PRTR5V0U2X, ESD suppressor, SMD SOT-143B
LED1 (TX) = HSMG-C190, green, SMD 0603
LED2 (RX) = HSMS-C190, red, SMD 0603
IC1 = FT231XQ, SMD QFN-20

K1 = micro-USB type B, female, SMD
K2 = 6-pin pinheader, 0.1" pitch, right angled
K3,K4 = 9-pin pinheader, 0.1" pitch, straight
PCB no. 180537-1 v1.0, from the Elektor Store

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