FT231XQ-R

FTDI

-40℃~+85℃ 125uA 3.3V~5V 8mA USB 2.0 USB to UART QFN-20-EP(4x4) USB Converters ROHS

Extended

Datasheetftdi/FT231XQ-R

Category: USB Converters
Package: QFN-20-EP(4x4)
Pins: 21

Overview

The FT231XQ-R is a USB Converter made by FTDI in a QFN-20-EP(4x4) package with 21 pins. -40℃~+85℃ 125uA 3.3V~5V 8mA USB 2.0 USB to UART QFN-20-EP(4x4) USB Converters ROHS.

PCBKit's library has its KiCad symbol (Interface_USB:FT231XQ, from KiCad's library) and its footprint (Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm, from KiCad's library), ready for a KiCad board. 2,666 are in stock at JLCPCB (part C132159). 91 open-source boards in 68 repositories on GitHub use it.

Symbol

Interface_USB:FT231XQFrom KiCad's library

Footprint

Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mmFrom KiCad's library

From the datasheet

Supply, least: 2.97 V · VCC, recommended operating min, normal operation · p. 17
Supply, most: 5.5 V · VCC, recommended operating max, normal operation · p. 17
Supply, least: 1.62 V · VCCIO, recommended operating min · p. 17
Supply, most: 3.63 V · VCCIO, recommended operating max · p. 17
Supply, absolute maximum: 5.5 V · VCC, absolute max · p. 16
Supply, absolute maximum: 4 V · VCCIO, absolute max · p. 16
Works from: -40 °C · Ambient operating temperature min, power applied · p. 16
Works up to: 85 °C · Ambient operating temperature max, power applied · p. 16
Takes working: 8 mA · VCC, operating supply current typical, normal operation · p. 17
Takes at most: 8.4 mA · VCC, operating supply current max, normal operation · p. 17
Takes asleep: 125 µA · VCC, USB suspend supply current typical · p. 17
A pin gives at most: 22 mA · DC output current, absolute max per output · p. 16

What it is and has

Interface: USB to full handshake serial UART · p. 13
CBUS: 4 configurable I/O pins · p. 13
Clock: Integrated clock; no external crystal required · p. 13
USB: USB 2.0 Full Speed · p. 1
UART signal inversion: Optional · p. 1
Power-on reset: Integrated · p. 1
LDO regulators: Internal 3V3 and 1V8 · p. 1
Bit bang modes: Synchronous and asynchronous · p. 1

Specifications

Parameter	Conditions	As printed	Page
Storage Temperature		min -65 · max 150 Degrees C	16
Floor Life (Out of Bag) At Factory Ambient (30°C / 60% Relative Humidity)	IPC/JEDEC J-STD-033A MSL Level 3 Compliant	max 168 Hours	16
Ambient Operating Temperature (Power Applied)	Power applied	min -40 · max 85 Degrees C	16
VCC Supply Voltage		min -0.3 · max 5.5 V	16
VCCIO IO Voltage		min -0.3 · max 4 V	16
DC Input Voltage – USBDP and USBDM		min -0.5 · max 3.63 V	16
DC Input Voltage – High Impedance Bi-directionals (powered from VCCIO)	Powered from VCCIO	min -0.3 · max 5.8 V	16
DC Output Current – Outputs		max 22 mA	16
ESD Charge Device Mode(CDM)	Class III	max 500 V	16
ESD Human Body Mode (HDM)	Class 2	max 2000 V	16
Human Body Mode (HBM)	> ± 2kV	min 2 kV	16
Machine mode (MM)	> ± 200V	min 200 V	16
Charged Device Mode (CDM)	> ± 500V	min 500 V	16
Latch-up	> ± 200mA	min 200 mA	16
VCC Operating Supply Voltage VCC	Ambient Temperature = -40°C to +85°C; Normal Operation	min 2.97 · typ 5 · max 5.5 V	17
VCCIO Operating Supply Voltage VCC2	Ambient Temperature = -40°C to +85°C	min 1.62 · max 3.63 V	17
Operating Supply Current Icc1	Ambient Temperature = -40°C to +85°C; Normal Operation	min 8 · typ 8 · max 8.4 mA	17
Operating Supply Current Icc2	Ambient Temperature = -40°C to +85°C; USB Suspend	typ 125 uA	17
3.3v regulator output 3V3	Ambient Temperature = -40°C to +85°C; VCC must be greater than 3V3 otherwise 3V3OUT is an input which must be driven with 3.3V	min 2.97 · typ 3.3 · max 3.63 V	17
Output Voltage High Voh	Ioh = +/-2mA; I/O Drive strength = 4mA; typical and maximum are VCCIO	min 2.97 V	18
Output Voltage High Voh	I/O Drive strength = 8mA; typical and maximum are VCCIO	min 2.97 V	18
Output Voltage High Voh	I/O Drive strength = 12mA; typical and maximum are VCCIO	min 2.97 V	18
Output Voltage High Voh	I/O Drive strength = 16mA; typical and maximum are VCCIO	min 2.97 V	18
Output Voltage Low Vol	Iol = +/-2mA; I/O Drive strength = 4mA	typ 0 · max 0.4 V	18
Output Voltage Low Vol	I/O Drive strength = 8mA	typ 0 · max 0.4 V	18
Output Voltage Low Vol	I/O Drive strength = 12mA	typ 0 · max 0.4 V	18
Output Voltage Low Vol	I/O Drive strength = 16mA	typ 0 · max 0.4 V	18
Input low Switching Threshold Vil	LVTTL	max 0.8 V	18
Input High Switching Threshold Vih	LVTTL	min 2 V	18
Switching Threshold Vt	LVTTL	typ 1.49 V	18
Schmitt trigger negative going threshold voltage Vt-		typ 1.15 V	18
Schmitt trigger positive going threshold voltage Vt+		typ 1.64 V	18
Input pull-up resistance Rpu	Vin = 0	min 40 · typ 75 · max 190 KΩ	18
Input pull-down resistance Rpd	Vin =VCCIO	min 40 · typ 75 · max 190 KΩ	18
Input Leakage Current Iin	Vin = 0; typical +/-1 uA	min -10 · max 10 uA	18
Tri-state output leakage current Ioz	Vin = 5.5V or 0; typical +/-1 uA	min -10 · max 10 uA	18
Output Voltage High Voh	Ioh = +/-2mA; I/O Drive strength = 4mA; typical and maximum are VCCIO	min 2.25 V	19
Output Voltage High Voh	I/O Drive strength = 8mA; typical and maximum are VCCIO	min 2.25 V	19
Output Voltage High Voh	I/O Drive strength = 12mA; typical and maximum are VCCIO	min 2.25 V	19
Output Voltage High Voh	I/O Drive strength = 16mA; typical and maximum are VCCIO	min 2.25 V	19
Input High Switching Threshold Vih	LVTTL	min 0.8 V	19
Switching Threshold Vt	LVTTL	typ 1.1 V	19
Schmitt trigger negative going threshold voltage Vt-		typ 0.8 V	19
Schmitt trigger positive going threshold voltage Vt+		typ 1.2 V	19
Output Voltage High Voh	Ioh = +/-2mA; I/O Drive strength = 4mA; typical and maximum are VCCIO	min 1.62 V	20
Output Voltage High Voh	I/O Drive strength = 8mA; typical and maximum are VCCIO	min 1.62 V	20
Output Voltage High Voh	I/O Drive strength = 12mA; typical and maximum are VCCIO	min 1.62 V	20
Output Voltage High Voh	I/O Drive strength = 16mA; typical and maximum are VCCIO	min 1.62 V	20
Input low Switching Threshold Vil	LVTTL	max 0.77 V	20
Input High Switching Threshold Vih	LVTTL	min 1.6 V	20
Switching Threshold Vt	LVTTL	typ 0.77 V	20
Schmitt trigger negative going threshold voltage Vt-		typ 0.557 V	20
Schmitt trigger positive going threshold voltage Vt+		typ 0.893 V	20

Ordering codes, by the datasheet

FT231XQ-R: 20 Pin QFN · Taped and reel, 5,000pcs per reel · p. 2

Parameters

Applications Function: USB to UART
Current - Supply: 8mA
Current - Supply(Max): 8.4mA
Data Rate: 3Mbps
Features: FIFO buffer；Programmable baud rate；Built-in clock generator；Hardware flow control support；Power-on reset
Operating Temperature: -40℃~+85℃
Output Current per Pin(Max): 22mA
Quiescent Supply Current: 125uA
Standby Current: 125uA
USB Protocol: USB 2.0
Voltage - Supply: 1.62V~5.5V
Voltage - Supply(Absolute Max): 5.5V

Order codes

FT231XQ-RLCSC C132159

Pinout

The pins of the FT231XQ-R
Pin	Name	Type
1	RXD	Input
2	RI	Input
3	GND	Power in
4	DSR	Input
5	DCD	Input
6	CTS	Input
7	CBUS2	Input/output
8	USBDP	Input/output
9	USBDM	Input/output
10	3V3OUT	Power out
11	RESET	Input
12	VCC	Power in
13	GND	Power in
14	CBUS1	Input/output
15	CBUS0	Input/output
16	CBUS3	Input/output
17	TXD	Output
18	DTR	Output
19	RTS	Output
20	VCCIO	Power in
21	GND	Power in

Open-source boards using it

All 91

4 layers65 × 30 mm
Icepi zero
cheyao/icepi-zero
An ECP5 FPGA Dev Board in a Pi Zero form
163 parts869
4 layers94 × 50.8 mm
Ulx3s
drandyhaas/KiCadRoutingTools
A set of Python/Rust tools to aid routing in KiCad
235 parts744MIT
4 layers46.8 × 34.8 mm
SmartWatch V4
Bellafaire/ESP32-Smart-Watch
An open source smartwatch based on the ESP32 compatible with the Arduino IDE.
74 parts258MIT
6 layers13 × 9.4 mm
Femu
femtoduino/femu-hardware
Femto ESP32 Micro USB
43 parts33MIT
6 layers80 × 70 mm
IMX6 Demo Board from REF
ts-manuel/iMX6-Demo-Board
Demo board for the i.MX6ULL Single-Core Processor with Arm Cortex-A7 Core
504 parts10GPL-3.0
4 layers89 × 57 mm
Type c card lexxpluss 2023
shujima/type-c-card

316 parts8
4 layers50 × 80 mm
ARGOS DEMO
CNES/argos-demo-board
Demo board designed to use the ARRIBADA SMD module via USB to send ARGOS messages to the Kineis constellation.
91 parts7CERN-OHL-S-2.0
2 layers101.5 × 53.3 mm
Mega
fortytwosystems/Mega
Arduino Mega replacement based on Microchip SAMC21
81 parts4GPL-3.0

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Questions

Is there a KiCad symbol and footprint for the FT231XQ-R?

Yes. The symbol is Interface_USB:FT231XQ and the footprint Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the FT231XQ-R?

QFN-20-EP(4x4), with 21 pins. Its footprint is drawn on this page.

Where is the FT231XQ-R datasheet?

FTDI publishes it: the Datasheet link on this page opens it.

Where can I order the FT231XQ-R?

JLCPCB lists it as part C132159, with 2,666 in stock; the sellers' links on this page open their listings.

What can replace the FT231XQ-R?

Parts like it in the library: the FT231XQ-T by FTDI and the FT221XQ-R by FTDI. Check their datasheets: a part that fits the footprint may still differ in its ratings.

Which open-source boards use the FT231XQ-R?

91 boards in 68 repositories on GitHub; the most starred are listed on this page, with their KiCad files.