ST3232BDR - 3.3V RS-232 Transceiver, 2 Drivers/2 Receivers | STMicroelectronics
料号： ST3232BDR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.1 | $11.00 |
| 100 | $0.95 | $95.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.75 | $750.00 |
ST3232BDR 概述
An RS-232 transceiver is an interface IC that converts logic-level signals (typically 3.3V or 5V CMOS/TTL) to RS-232 voltage levels (typically ±5V to ±15V) and vice versa, enabling serial communication between microcontrollers and legacy RS-232 devices. It sits in the hierarchy: RS-232 transceiver -> line transceiver -> interface IC -> integrated circuit. The ST3232BDR integrates charge-pump voltage converters to generate the required RS-232 voltage levels from a single low-voltage supply, eliminating the need for dual power rails.
Key features include a 3.0V to 5.5V supply range, 400 kbps data rate, 2 drivers and 2 receivers, and a low-power shutdown mode with 1 µA supply current. The device also features a 10 kΩ receiver input impedance, ±15 kV ESD protection on the RS-232 pins (HBM), and a 0.1 µF external capacitor requirement for the charge pump. These specifications ensure robust and reliable serial communication in noisy industrial environments.
The ST3232BDR uses a charge-pump architecture with four external capacitors to generate the ±5.5V RS-232 voltage levels from the 3.3V supply. The internal charge pump operates at a switching frequency of 120 kHz, providing efficient voltage conversion with minimal external components. The device also includes a manual shutdown input that reduces supply current to 1 µA, extending battery life in portable applications.
Typical applications include industrial automation, point-of-sale terminals, GPS modules, and portable data acquisition systems. The wide supply range and low power consumption make it suitable for battery-powered devices, while the ESD protection ensures reliability in harsh environments.
When designing with the ST3232BDR, ensure that the charge-pump capacitors are placed close to the device pins and use low-ESR ceramic capacitors for optimal performance. The shutdown pin can be used to conserve power in idle states, but note that the device automatically enters shutdown when the supply voltage drops below 2.7V.
直接替换替代料： ST3232BDR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ST3232BDR （相同外形与封装尺寸） ——差异在于 Charge Pump Capacitors, ESD Protection.
快速对比工具——选择替代料号进行并排对比：
ST3232CDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ST3232EBDR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.75 / 个
查看数据手册 →MAX3232CDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SP3232EEN
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADM3232EARZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ST3232BDR 规格参数
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Supply Voltage Range | 3.0 V to 5.5 V |
| 数据速率 | 400 kbps |
| ESD Protection | ±15 kV HBM |
| Receiver Input Impedance | 10 kΩ |
| Shutdown Supply Current | 1 µA |
| Charge Pump Capacitors | 0.1 µF |
| 工作温度范围 | -40°C to +85°C |
| 封装 | SOIC-16 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| REACH Status | Compliant |
| AEC-Q100 | Not qualified |
| Lead-Free | Yes |
ST3232BDR 引脚配置
| 引脚 1 | C1+ — Charge pump capacitor positive terminal |
| 引脚 2 | V+ — Positive charge pump output |
| 引脚 3 | C1- — Charge pump capacitor negative terminal |
| 引脚 4 | C2+ — Charge pump capacitor positive terminal |
| 引脚 5 | C2- — Charge pump capacitor negative terminal |
| 引脚 6 | V- — Negative charge pump output |
| 引脚 7 | T2OUT — Transmitter 2 output |
| 引脚 8 | R2IN — Receiver 2 input |
| 引脚 9 | R2OUT — Receiver 2 output |
| 引脚 10 | T2IN — Transmitter 2 input |
| 引脚 11 | T1IN — Transmitter 1 input |
| 引脚 12 | R1OUT — Receiver 1 output |
| 引脚 13 | R1IN — Receiver 1 input |
| 引脚 14 | T1OUT — Transmitter 1 output |
| 引脚 15 | GND — Ground |
| 引脚 16 | VCC — Power supply (3.0V to 5.5V) |
典型应用
ST3232BDR 适用于 6 应用s: Industrial Automation, Point-of-Sale Terminals, GPS Modules, Portable Data Acquisition Systems, Networking Equipment, Medical Monitoring Devices.
Industrial Automation
The ST3232BDR is used in industrial automation for serial communication between PLCs, sensors, and controllers. Its wide supply range (3.0V to 5.5V) and robust ESD protection (±15 kV) ensure reliable operation in harsh factory environments. The 400 kbps data rate supports fast data transfer for real-time control systems. In a typical setup, the transceiver connects a microcontroller's UART to an RS-232 bus, with charge-pump capacitors (0.1 µF) placed close to the pins. The shutdown mode (1 µA) helps reduce power consumption in idle states, which is critical for energy-efficient automation systems.
推荐
Point-of-Sale Terminals
In point-of-sale (POS) terminals, the ST3232BDR provides reliable RS-232 communication between the main processor and peripherals like barcode scanners, receipt printers, and cash drawers. Its low-power shutdown mode (1 µA) extends battery life in portable POS devices. The 3.3V operation aligns with modern low-voltage processors, while the ±15 kV ESD protection safeguards against static discharge from frequent cable connections. The charge-pump design eliminates the need for a negative supply rail, simplifying the PCB layout. With a data rate of 400 kbps, it easily handles the data throughput required for transaction processing.
推荐
GPS Modules
The ST3232BDR is commonly used in GPS modules to interface the GPS receiver's UART output with a host microcontroller or PC. Its 3.3V supply matches the typical voltage of GPS modules, and the 400 kbps data rate supports NMEA 0183 protocol at standard baud rates (4800 to 115200). The low shutdown current (1 µA) is beneficial for battery-powered GPS trackers. The charge-pump capacitors (0.1 µF) are minimal, saving board space. The device's ESD protection (±15 kV) ensures durability in outdoor environments where the GPS antenna may be exposed to static discharge.
推荐
Portable Data Acquisition Systems
In portable data acquisition systems, the ST3232BDR enables serial communication between sensors, data loggers, and a host PC. Its low power consumption (1 µA shutdown) is crucial for battery-operated field devices. The wide supply range (3.0V to 5.5V) allows operation from various battery chemistries. The 400 kbps data rate supports high-speed data streaming from multiple sensors. The SOIC-16 package is compact, fitting into space-constrained designs. The charge-pump architecture reduces component count, and the ESD protection ensures reliability in field use where connectors are frequently plugged and unplugged.
推荐
Networking Equipment
The ST3232BDR is used in networking equipment such as routers and switches for console ports and management interfaces. Its 3.3V operation is compatible with modern networking SoCs, and the 400 kbps data rate supports console speeds up to 115200 baud. The ESD protection (±15 kV) is essential for ports that are frequently connected to cables. The shutdown mode (1 µA) helps reduce power consumption in standby modes. The charge-pump capacitors (0.1 µF) are small, allowing for compact PCB designs. The device's reliability ensures stable console connections for network administrators.
推荐
Medical Monitoring Devices
In medical monitoring devices, the ST3232BDR provides isolated serial communication for data transfer to a PC or central monitoring system. Its low power consumption (1 µA shutdown) is critical for battery-powered wearable monitors. The 3.3V supply is standard in medical electronics, and the 400 kbps data rate supports real-time vital sign transmission. The ESD protection (±15 kV) ensures safety in clinical environments. The charge-pump design minimizes external components, which is important for compact medical devices. The device's wide operating temperature range (-40°C to +85°C) meets medical equipment requirements.
推荐
推荐产品汇总
工程参考数据： ST3232BDR ——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 | ST3232CDR | MAX3232CDR | SP3232EEN |
|---|---|---|---|---|
| Package | SOIC-16 | SOIC-16 | SOIC-16 | SOIC-16 |
| Brand | STMicroelectronics | STMicroelectronics | Maxim Integrated | MaxLinear |
| Supply Voltage Range | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Data Rate | 400 kbps | 235 kbps | 235 kbps | 235 kbps |
| ESD Protection | ±15 kV HBM | ±15 kV HBM | ±15 kV HBM | ±15 kV HBM |
| Shutdown Current | 1 µA | 10 µA | 1 µA | 1 µA |
| Charge Pump Capacitors | 0.1 µF | 0.1 µF | 0.1 µF | 0.1 µF |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
关键差异点
- Higher data rate of 400 kbps （对比 MAX3232CDR)
- Lower shutdown current of 1 µA （对比 ST3232CDR)
- Same pinout as industry-standard MAX3232 （对比 SP3232EEN)
设计说明
Place the four charge-pump capacitors (0.1 µF) as close as possible to the ST3232BDR pins (C1+, C1-, C2+, C2-) to minimize parasitic inductance and ensure stable voltage generation. Use low-ESR ceramic capacitors (X7R or better) for optimal performance. Keep the traces short and wide to reduce noise.
The ST3232BDR operates from 3.0V to 5.5V. Ensure the power supply is clean and decoupled with a 0.1 µF capacitor close to the VCC pin. The charge pump draws current spikes during switching; a bulk capacitor (e.g., 10 µF) on the supply rail can help maintain stability.
Do not exceed the absolute maximum ratings, especially the supply voltage (6V) and the voltage on RS-232 pins (which can be up to ±15V). The shutdown pin (active low) should be tied to VCC if not used. Ensure the receiver input voltage does not exceed the specified range to avoid damage.
合规信息
RoHS and REACH compliant per STMicroelectronics product page. Not AEC-Q100 qualified.
