FT232RL-REEL - USB to UART Bridge IC, SSOP-28 | FTDI
料号： FT232RL-REEL ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.48 | $5.48 |
| 10 | $4.95 | $49.50 |
| 100 | $4.4 | $440.00 |
| 500 | $3.92 | $1,960.00 |
| 1,000 | $3.55 | $3,550.00 |
FT232RL-REEL 概述
A USB-to-UART bridge IC is a class of interface controller that translates between the Universal Serial Bus (USB) protocol and asynchronous serial (RS-232-style UART) signaling, allowing legacy microcontrollers and embedded designs to gain a USB connectivity port without writing low-level USB stack code. Within the broader power-management and connectivity taxonomy, the FT232RL belongs to the interface IC family, sitting alongside RS-232/RS-485 transceivers, I2C/SPI bridges, and CAN controllers as a host-side communication protocol converter.
Key features include an integrated 3.3 V LDO regulator that powers the internal USB transceiver, an on-chip 12 MHz oscillator with optional external clock input, 1 KB of programmable EEPROM for vendor/product descriptors and CBUS pin configuration, and configurable CBUS pins that can be assigned to functions such as TX/RX LED drivers, clock output, or GPIO. The IC supports USB 2.0 Full Speed (12 Mbps) and provides four modem-control signals (RTS, CTS, DTR, DSR) plus DCD and RI for legacy serial handshaking.
The architecture combines a USB Serial Interface Engine (SIE) with a 16-byte transmit buffer and 16-byte receive buffer FIFO, an embedded UART engine, and a flexible CBUS I/O subsystem. This hardware partitioning allows the host MCU to communicate through a standard serial port while the FT232RL handles all USB enumeration, descriptor loading, and bus signaling.
Typical applications include microcontroller-to-USB bridges for firmware debug consoles, industrial sensor data loggers, point-of-sale (POS) terminals, USB dongles for wireless modules, and legacy RS-232 equipment modernization. It is also widely embedded inside FPGA development boards and 3D printer controllers as a USB debug/programming port.
When designing with the FT232RL, observe the official FTDI hardware design guidelines: provide a 27 ohm series resistor on each USB differential pair, place the 12 MHz crystal within 5 mm of the XIN/XOUT pins with a guard ground ring, and connect VBUS to the 5 V supply through a 10 kohm resistor for bus-powered designs. Failure to follow the reference layout can degrade USB signal integrity and cause enumeration failures.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing a single-page engineering reference for selecting, sourcing, and laying out the FT232RL-REEL.
直接替换替代料： FT232RL-REEL ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
FT232RNL-REEL
✅ 直接替换📋 参考替代料（不在目录中）
FT232RL-R
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
FT232RL-TUBE
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
CY7C65213-28LTXC
✅ 直接替换📋 参考替代料（不在目录中）
FT232RL-REEL 规格参数
| 功能 | USB to UART serial bridge |
| USB Standard | USB 2.0 Full Speed (12 Mbps) |
| Data Rate (UART) | 300 baud to 3 Mbaud |
| Supply Voltage (VCC) | 3.3 V to 5.25 V |
| Logic I/O Voltage | 1.8 V to 5.25 V |
| Supply Current (typical) | 25 mA |
| 工作温度 | -40 C to +85 C |
| 封装 | SSOP-28 (208 mil) |
| 安装类型 | Surface Mount |
| 引脚数 | 28 |
| On-chip EEPROM | 1 KB |
| Internal Oscillator | 12 MHz (with optional external clock) |
| Transmit Buffer | 16 bytes |
| Receive Buffer | 16 bytes |
| Modem Control Signals | RTS, CTS, DTR, DSR, DCD, RI |
| CBUS Pins | 6 configurable (TX/RX LED, Clock, GPIO, PWRON, SLEEP) |
| Internal LDO | 3.3 V for USB transceiver |
| Drivers | VCP, D2XX (multi-platform) |
| RoHS 状态 | Compliant |
| MSL 等级 | 1 |
FT232RL-REEL 引脚配置
| 引脚 1 | TXD — Transmit Data output from UART |
| 引脚 2 | DTR — Data Terminal Ready modem output |
| 引脚 3 | RTS — Request To Send modem output |
| 引脚 4 | VCC — +3.3 V to +5.25 V main supply |
| 引脚 5 | RXD — Receive Data input to UART |
| 引脚 6 | RI — Ring Indicator modem input |
| 引脚 7 | GND — Device ground |
| 引脚 8 | DCD — Data Carrier Detect modem input |
| 引脚 9 | DSR — Data Set Ready modem input |
| 引脚 10 | CTS — Clear To Send modem input |
| 引脚 11 | CBUS4 — Configurable CBUS pin (default: TXLED#) |
| 引脚 12 | CBUS2 — Configurable CBUS pin (default: TXDEN) |
| 引脚 13 | CBUS3 — Configurable CBUS pin (default: PWRON#) |
| 引脚 14 | CBUS1 — Configurable CBUS pin (default: RXLED#) |
| 引脚 15 | CBUS0 — Configurable CBUS pin (default: TXLED) |
| 引脚 16 | CBUS5 — Configurable CBUS pin (default: CLK30) |
| 引脚 17 | OSCI — Input to 12 MHz oscillator (XOUT) |
| 引脚 18 | OSCO — Output from 12 MHz oscillator (XIN) |
| 引脚 19 | RESET# — Active-low reset input (tie to VCC via 10k for normal operation) |
| 引脚 20 | VCC — +3.3 V to +5.25 V main supply |
| 引脚 21 | GND — Device ground |
| 引脚 22 | CBUS6 — Configurable CBUS pin (default: GPIO) |
| 引脚 23 | CBUS7 — Configurable CBUS pin (default: PWREN#) |
| 引脚 24 | TEST — Test pin (must be tied to GND for normal operation) |
| 引脚 25 | AGND — Analog ground for internal PLL |
| 引脚 26 | GND — Device ground |
| 引脚 27 | USBDP — USB D+ differential data line |
| 引脚 28 | USBDM — USB D- differential data line |
典型应用
FT232RL-REEL 适用于 6 应用s: Microcontroller USB Debug Console, Industrial Sensor Data Logger, FPGA Development Board USB Port, Point-of-Sale (POS) Terminal USB Connectivity, 3D Printer Controller USB Port, Wireless Module USB Dongle.
Microcontroller USB Debug Console
The FT232RL-REEL serves as the canonical USB-to-UART debug port for microcontroller development boards, providing a 3 Mbaud transparent serial channel between a host PC and the target MCU's UART pins. Its 16-byte TX/RX FIFOs sustain high-throughput printf-style logging without back-pressuring the MCU, while the integrated 3.3 V LDO eliminates the need for an external regulator. The CBUS pins can be configured as TX/RX LED drivers to give the user a visual traffic indicator, and the FTDI VCP/D2XX driver stack is pre-installed on Windows, macOS, and Linux, so no driver deployment is needed. Compared to a discrete USB implementation using a microcontroller's USB peripheral, the FT232RL offloads the USB stack entirely and works with any MCU regardless of whether it has a built-in USB controller, which is why it is found on nearly every ARM Cortex-M and AVR development board.
推荐
Industrial Sensor Data Logger
In industrial data-logger designs the FT232RL-REEL converts the host MCU's serial sensor stream (Modbus RTU, NMEA, or vendor protocol) into USB for direct PC ingestion without additional protocol converters. Its -40 C to +85 C industrial temperature range and SSOP-28 footprint suit DIN-rail and panel-mount enclosures. The 1 KB on-chip EEPROM stores custom VID/PID so the logger appears as a branded device in the host OS, simplifying field-deployment driver signing. CBUS0 can be configured as a power-on reset pulse for the connected MCU, allowing the host application to remotely reboot the logger over USB, while the modem-control signals (RTS/CTS/DTR/DSR) enable hardware-flow-controlled acquisition from high-speed sensors. Compared to a Wi-Fi or Ethernet bridge, USB offers deterministic bandwidth and zero configuration for technicians, which is preferred in factory-floor deployments.
推荐
FPGA Development Board USB Port
The FT232RL-REEL is the de-facto USB-to-UART programming/debug port on most FPGA development boards, including early Spartan-6 and Cyclone IV kits, where it bridges a host PC's USB to the FPGA's UART or JTAG-over-UART pins. Its 3 Mbaud ceiling comfortably covers JTAG-over-serial bitstreams and bit-banged configuration protocols used by open-source FPGA toolchains. The on-chip CBUS pins can be re-tasked as DONE-LED or PROGRAMN-B drivers, simplifying the board schematic, and the FTDI VCP driver is bundled with Vivado and Quartus, eliminating a separate driver install step. Compared to a dedicated FT2232H JTAG controller, the FT232RL is lower cost and simpler BOM when only UART-style configuration is required, which is common for soft-core CPUs and embedded RISC-V designs.
推荐
Point-of-Sale (POS) Terminal USB Connectivity
POS terminals, receipt printers, and barcode scanners frequently use the FT232RL-REEL as a USB-to-UART bridge to the main application processor, supporting the legacy RS-232 command sets still common in retail peripherals. Its reliable USB enumeration and FTDI VCP driver ensure plug-and-play operation on Windows POS systems and Linux-based kiosks, while the 1 KB EEPROM can store vendor-specific serial numbers for inventory tracking. The modem-control signals (RTS, DTR) are used to wake peripheral devices from low-power standby, reducing in-store energy consumption. Compared to native USB peripherals, RS-232-via-FT232RL offers a simpler firmware path because most POS application code already has a serial-port abstraction layer, which shortens time-to-market and reduces certification cost.
推荐
3D Printer Controller USB Port
The FT232RL-REEL is the standard USB-to-UART bridge on most 3D printer controller boards (Marlin-firmware printers based on ATmega2560 and STM32F4 designs), converting USB G-code streams from the host slicer into UART commands the printer MCU understands. Its 250 kbaud typical operating rate (Marlin's default baud) sits well within the FT232RL's 3 Mbaud ceiling, leaving headroom for telemetry and command echo. The integrated 12 MHz oscillator and 3.3 V LDO simplify the BOM by removing the need for an external regulator, while the SSOP-28 footprint fits the tight layout of small controller boards. CBUS pins are commonly re-purposed as fan-PWM or status-LED drivers to further reduce external components. Compared to native-USB printer controllers, the FT232RL approach is favored by the hobbyist community because it works with the existing Marlin serial protocol without firmware changes.
推荐
Wireless Module USB Dongle
USB dongles housing wireless modules (sub-GHz radios, LoRa, BLE sniffer boards) often use the FT232RL-REEL as the host-side USB-to-UART bridge to the module's UART pins, allowing the dongle to enumerate as a virtual COM port and work with any terminal program. Its small SSOP-28 package fits inside a typical USB-A stick enclosure, and the 1 KB EEPROM lets the dongle present a unique VID/PID that identifies the wireless protocol to the host application. The CBUS pins can be re-tasked as a module-reset pulse or as a button-debounced GPIO, removing external glue logic. Compared to integrating a microcontroller's native USB, the FT232RL approach dramatically simplifies dongle firmware because the host PC handles all USB protocol overhead, while the wireless module handles only the radio protocol.
推荐
推荐产品汇总
工程参考数据： FT232RL-REEL ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | FT232RNL-REEL | FT232RL-R | FT232RL-TUBE | CY7C65213-28LTXC |
|---|---|---|---|---|---|
| Package | SSOP-28 (208 mil) | SSOP-28 (208 mil) - same | SSOP-28 (208 mil) - same | SSOP-28 (208 mil) - same | SSOP-28 - same |
| Brand | FTDI | FTDI | FTDI | FTDI | Infineon |
| Lifecycle Status | Obsolete (LTB 1 Jun 2024) | Active | Obsolete | Obsolete | Active |
| USB Standard | USB 2.0 Full Speed (12 Mbps) | USB 2.0 Full Speed (12 Mbps) | USB 2.0 Full Speed (12 Mbps) | USB 2.0 Full Speed (12 Mbps) | USB 2.0 Full Speed (12 Mbps) |
| Max UART Baud Rate | 3 Mbaud | 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 | 3.3 V to 5.25 V | 1.71 V to 5.5 V (wider) |
| Driver Model | FTDI VCP / D2XX | FTDI VCP / D2XX | FTDI VCP / D2XX | FTDI VCP / D2XX | Infineon USB-Serial (CDC-ACM/Vendor) |
| On-chip EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | Configurable via firmware |
| Internal LDO | 3.3 V LDO (USB transceiver) | 3.3 V LDO (improved) | 3.3 V LDO | 3.3 V LDO | Internal 3.3 V regulator |
| Approx 1pc Price (USD) | 5.48 | ~4.60 | ~5.40 | ~5.50 | ~3.20 |
关键差异点
- Drop-in pin compatibility with active-production FT232RNL-REEL （对比 FT232RL-REEL (obsolete) vs FT232RNL-REEL)
- Mature FTDI VCP/D2XX driver ecosystem （对比 FT232RL-REEL vs Infineon CY7C65213-28LTXC)
- 1 KB on-chip EEPROM for custom VID/PID （对比 FT232RL-REEL vs Silicon Labs CP2102N (QFN-28))
设计说明
Place the 12 MHz crystal within 5 mm of the FT232RL-REEL's OSCI/OSCO pins (pins 17 and 18) and surround the crystal with a guard ground ring connected to GND. According to FTDI hardware design guidelines, use a crystal with 20 ppm initial accuracy and 30 pF load capacitance, and route the USB differential pair (USBDP/USBDM, pins 27 and 28) as a 90-ohm differential trace with maximum length 50 mm. Keep the data lines away from switching power and clock signals to preserve USB signal integrity. Estimated: a 4-layer stackup with continuous ground plane under the USB section is required to meet USB-IF compliance.
The TEST pin (pin 24) must be tied to GND for normal operation; floating this pin places the device into test mode and prevents USB enumeration. The RESET# pin (pin 19) should be pulled up to VCC through a 10 kohm resistor or driven by a microcontroller for proper power-on sequencing. Decoupling requires a 100 nF ceramic capacitor placed within 3 mm of the VCC pins (pins 4 and 20) plus a 4.7 uF bulk capacitor; missing bulk capacitance can cause VBUS current spikes that trigger USB host port shutdown.
For bus-powered designs, route VBUS (5 V from USB) to VCC through a 10 kohm resistor and place a 10 uF decoupling capacitor at VCC. The internal 3.3 V LDO can source up to 50 mA to external CBUS-driven circuitry, but the total system budget (including the FT232RL's own 25 mA typical) must remain under 100 mA for a low-power USB port or 500 mA for a high-power port. Self-powered designs must use a voltage divider or regulator to ensure VCC never exceeds 5.25 V when the host is suspended, otherwise the internal LDO can back-power the USB transceiver and violate USB compliance.
合规信息
RoHS and REACH compliant per FTDI product page. Not AEC-Q100 qualified - choose CY7C65213 for automotive applications. Counterfeit risk is elevated due to obsolete status; purchase only from authorized distribution.
