FT232RQ - USB to UART Bridge IC, QFN-32 | FTDI
Teilenummer: FT232RQ ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $4.5 | $4,50 |
| 10 | $4.05 | $40,50 |
| 100 | $3.6 | $360,00 |
| 500 | $3.15 | $1.575,00 |
| 1.000 | $2.7 | $2.700,00 |
| 3.000 | $2.4 | $7.200,00 |
FT232RQ Übersicht
A USB-to-UART bridge is a protocol converter that translates USB signalling into a generic asynchronous serial interface (RS-232-style UART). It sits at the boundary between a USB host and an embedded MCU, sensor, or industrial controller that exposes only UART. Compared to native USB on microcontrollers, a dedicated bridge removes the need for on-chip USB peripherals, crystal matching, or impedance-controlled PCB routing, simplifying hardware design and shortening time-to-prototype. Bridges like the FT232R family belong to the broader category of interface ICs, alongside RS-232/RS-485 transceivers and CAN/LIN controllers.
Key features of the FT232RQ include an integrated 3.3 V LDO regulator with external power output, integrated 12 MHz oscillator, integrated power-on-reset circuit, and configurable CBUS I/O pins for status LEDs, TX/RX LEDs, or general-purpose handshaking. It also supports FTDI's Bit-Bang mode, allowing the eight UART/handshake pins to be used as a general-purpose bidirectional parallel I/O port under software control - a popular feature for FPGA configuration, EEPROM programming, and JTAG bridging.
The FT232RQ uses a dedicated USB transceiver and serial-parallel engine block; data from the USB endpoint is buffered in a 384-byte transmit and 128-byte receive FIFO and then clocked out by an internal baud-rate generator. The device is USB 2.0 Full Speed compatible and works with UHCI/OHCI/EHCI host controllers. Its low operating and suspend currents make it suitable for bus-powered designs and battery-powered accessories.
Typical applications include USB-to-RS232 adapter dongles, microcontroller debug and programming interfaces (Arduino bootloaders, ESP8266/ESP32 firmware flash bridges), industrial instrumentation with USB diagnostics ports, point-of-sale terminals, USB-to-JTAG/SPI bridges via Bit-Bang mode, and embedded debug consoles on FPGAs and DSPs. The wide 3.3 V to 5.25 V supply range covers both 3.3 V and 5 V logic targets.
When designing with the FT232RQ, note that this part is in the FTDI product family as an EOL/NRND variant; the active direct replacement is the FT232RNQ in the same QFN-32 package. Add 27 ohm series resistors on USB D+/D- if the datasheet recommendation is required, and place the decoupling capacitors as close as possible to VCC and the internal 3V3OUT pin to keep noise off the analog regulator.
This page synthesizes distributor pricing, drop-in QFN-32 alternatives from FTDI's RN family and Infineon's CY7C65213, and practical design notes not collected in the FT232R datasheet alone.
Drop-in-Alternativen für FT232RQ – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit FT232RQ (gleiche Bauform und Footprint) – abweichend in Function, Operating Temperature, Package, RoHS Status, Supply Voltage.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
FT232RNQ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
FT232RQ Technische Daten
| Funktion | USB to UART Bridge IC |
| USB Specification | USB 2.0 Full Speed (12 Mbps) |
| Versorgungsspannung | 3.3 V to 5.25 V |
| Data Rate (Standard) | 300 baud to 3 Mbaud |
| UART Channels | 1 (TX, RX, RTS, CTS, DTR, DSR, DCD, RI) |
| Internal FIFO | 384 byte TX / 128 byte RX |
| Internal Oscillator | 12 MHz |
| Internal LDO Output | 3.3 V (powers external circuitry) |
| Gehäuse | 32-pin QFN (5x5 mm) |
| Betriebstemperatur | -40 C to +85 C |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Driver Support | VCP, D2XX (Windows, macOS, Linux) |
FT232RQ Pin-Konfiguration
| Pin 1 | GND — Ground reference |
| Pin 2 | VCC — Supply voltage (3.3 V to 5.25 V) |
| Pin 3 | 3V3OUT — Internal 3.3 V LDO output for external circuitry |
| Pin 4 | USBDP — USB D+ data line |
| Pin 5 | USBDM — USB D- data line |
| Pin 6 | GND — Ground reference |
| Pin 7 | OSCI — 12 MHz oscillator input (internal on RQ) |
| Pin 8 | OSCO — 12 MHz oscillator output |
| Pin 9 | RESET — Reset input (active low) |
| Pin 10 | TXD — UART transmit (to host) |
| Pin 11 | RXD — UART receive (from host) |
| Pin 12 | RTS — Request To Send (output) |
| Pin 13 | CTS — Clear To Send (input) |
| Pin 14 | DTR — Data Terminal Ready (output) |
| Pin 15 | DSR — Data Set Ready (input) |
| Pin 16 | DCD — Data Carrier Detect (input) |
| Pin 17 | RI — Ring Indicator (input) |
| Pin 18 | CBUS0 — Configurable CBUS pin (default: TXLED#) |
| Pin 19 | CBUS1 — Configurable CBUS pin (default: RXLED#) |
| Pin 20 | CBUS2 — Configurable CBUS pin (default: TXDEN) |
| Pin 21 | CBUS3 — Configurable CBUS pin (default: PWREN#) |
| Pin 22 | CBUS4 — Configurable CBUS pin (default: SLEEP#) |
| Pin 23 | CBUS5 — Configurable CBUS pin (default: DRIVE 0) |
| Pin 24 | TEST — Test pin (tie to GND per datasheet) |
| Pin 25 | AGND — Analog ground for internal PLL |
| Pin 26 | AVCC — Analog supply (tie to VCC) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
| Pin 29 | GND — Exposed pad / ground |
| Pin 30 | GND — Exposed pad / ground |
| Pin 31 | GND — Exposed pad / ground |
| Pin 32 | GND — Exposed pad / ground |
Typische Anwendungen
FT232RQ ist geeignet für 6 Anwendungs: USB to RS-232 Serial Adapter, Microcontroller Programming & Debug Bridge, FPGA Bit-Bang Configuration & JTAG, Industrial Instrumentation & Diagnostics, POS Terminal Hardware Connect, Audio Interface & MIDI to UART.
USB to RS-232 Serial Adapter
The FT232RQ is the canonical USB-to-UART bridge for desktop RS-232 DB9 adapter dongles, converting USB 2.0 Full Speed signalling to RS-232 voltage swings through an external transceiver such as the MAX3232. Its integrated 3.3 V LDO can power the transceiver side, the internal 12 MHz oscillator eliminates external crystals, and the full set of modem-control signals (RTS, CTS, DTR, DSR, DCD, RI) supports hardware flow control needed for industrial terminals. VCP driver compatibility ensures plug-and-play on Windows, macOS, and Linux without custom firmware, a key reason this topology remains dominant for legacy serial peripherals and lab instrumentation.
Empfohlen
Microcontroller Programming & Debug Bridge
The FT232RQ is widely deployed as a USB programming interface for Arduino bootloaders, ESP8266, ESP32, and other 3.3 V microcontrollers. Its DTR/RTS handshake pins drive the auto-reset-and-bootloader-entry circuit so firmware upload is fully automatic without manual button presses, and the internal 3.3 V LDO can power the target board for low-current nodes. When VCC is 5 V the UART outputs are 5 V TTL; when VCC is 3.3 V they shift accordingly, covering both 5 V Arduino and 3.3 V ESP targets with the same host-side board. The wide 3.3 V to 5.25 V supply range and VCP/D2XX driver ecosystem make it the lowest-friction debug-port solution.
Empfohlen
FPGA Bit-Bang Configuration & JTAG
The FT232RQ's Bit-Bang mode repurposes the eight UART/handshake pins as a software-driven parallel I/O port, making it a popular low-cost FPGA configuration bridge. Designers use it to load SPI-mode bitstreams into FPGAs, drive JTAG TDI/TDO/TMS/TCK sequences, or program small EEPROMs over I2C bit-banged from the host. The 384-byte TX FIFO keeps bit-bang throughput high while the integrated 12 MHz oscillator avoids external crystals, and CBUS pins can serve as additional enable or status signals. This makes the FT232RQ a flexible tool for prototype programming and lab test fixtures.
Empfohlen
Industrial Instrumentation & Diagnostics
Industrial instruments - process controllers, lab meters, motor drives - frequently expose a USB diagnostics port built on the FT232RQ. Its -40 C to +85 C extended operating temperature range and RoHS-compliant QFN-32 package support factory-floor and outdoor enclosures. The internal 3.3 V LDO can power auxiliary circuitry (op-amps, sensors, level shifters), and the full hardware-handshake set lets the host PC emulate a modem link for legacy SCADA software. Low USB suspend current keeps battery-backed instruments within budget, and the FTDI VCP driver means field laptops connect without installing custom software.
Empfohlen
POS Terminal Hardware Connect
Point-of-sale terminals - receipt printers, barcode scanners, customer displays - use the FT232RQ to add a USB service/maintenance port alongside the main host CPU. The full UART with hardware flow control supports command-line diagnostics, firmware update via XMODEM, and event logging from a service laptop, and the QFN-32 (5x5 mm) footprint fits inside compact POS enclosures. The CBUS pins can be reconfigured to drive status LEDs or control a power-mux, eliminating small discrete logic. Because the FT232RQ is EOL/NRND, FTDI recommends the FT232RNQ for new POS designs.
Empfohlen
Audio Interface & MIDI to UART
USB-MIDI adapters and audio-control surfaces use the FT232RQ's high-speed UART to bridge between a USB host and DSP/MCU running the audio pipeline. The 3 Mbaud maximum data rate comfortably exceeds MIDI's 31250 baud with substantial headroom for high-resolution control messages, and the low-latency FTDI D2XX driver supports tight real-time loops. The internal 3.3 V LDO powers MIDI-driver circuitry or a small optocoupler, while the wide 3.3 V to 5.25 V supply range lets the same design support both 3.3 V and 5 V MCU targets. This is why FT232R-family parts remain common in semi-professional audio gear.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für FT232RQ – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | FT232RNQ | FT232RL | CY7C65213-28LTXI |
|---|---|---|---|---|
| Brand | FTDI | FTDI | FTDI | Infineon |
| Package | QFN-32 (5x5 mm) | QFN-32 (5x5 mm) - same | SSOP-28 - differs | QFN-28 - differs |
| Lifecycle | EOL/NRND | Active | EOL/NRND | Active |
| USB Speed | Full Speed (12 Mbps) | Full Speed (12 Mbps) | Full Speed (12 Mbps) | Full Speed (12 Mbps) |
| Maximum UART Baud | 3 Mbaud | 3 Mbaud | 3 Mbaud | 3 Mbaud |
| Supply Voltage | 3.3 V to 5.25 V | 3.3 V to 5.25 V | 3.3 V to 5.25 V | 1.71 V to 5.5 V (wider) |
| Internal Oscillator | 12 MHz | 12 MHz | 12 MHz | Internal (no external crystal) |
| Driver Ecosystem | FTDI VCP/D2XX | FTDI VCP/D2XX | FTDI VCP/D2XX | Infineon/Cypress drivers |
Wichtigste Unterscheidungsmerkmale
- Same-family drop-in with active production status (vs. FT232RNQ)
- Lower pin count for cost-sensitive designs (vs. FT232RL)
- Wider supply range with Infinecy toolchain (vs. CY7C65213-28LTXI)
Designhinweise
Route USB D+/D- as a 90 ohm differential pair with no splits, keep total length under 50 mm, and add the 27 ohm series resistors recommended by the FT232R datasheet close to the FT232RQ. Place the VCC and 3V3OUT decoupling capacitors (typically 100 nF and 4.7 uF) within 2 mm of their respective pins. Tie the exposed thermal pad (pins 29-32) to a continuous ground pour with multiple stitching vias for thermal and reference integrity.
Do not load the FT232RQ's internal 3.3 V LDO beyond its rated current (the 3V3OUT pin powers external logic but cannot supply the entire board). Tie the TEST pin to GND per datasheet; leaving it floating can cause USB enumeration failure. The CBUS pins default to specific functions (TXLED#, RXLED#, PWREN#, etc.); if you reprogram them via the FTDI EEPROM utility, document the change because FT232RQ and FT232RNQ CBUS defaults may differ.
Estimated: at VCC = 5 V and UART active with all CBUS outputs loaded, the FT232RQ draws roughly 25 mA typical and falls below 2 mA during USB suspend (per the FT232R datasheet guidance). For bus-powered designs, ensure the host port can deliver the full 100 mA unit-load envelope, accounting for any 3V3OUT current drawn by external circuitry. Add a ferrite bead on VCC if the supply shares switching regulator noise with USB signalling.
Compliance-Informationen
RoHS-compliant Pb-free QFN-32 per FTDI product page. AEC-Q100 not applicable (industrial/commercial USB bridges, not automotive). Reach and conflict-minerals status inferred from FTDI corporate compliance statements; halogen-free status not explicitly published in the FT232R datasheet excerpt and marked unknown.
