The TD501D232H is an isolated RS-485 transceiver module with 250kbps data rate, 2500VDC isolation, and built-in ESD protection for industrial serial communication.
| 包装 | Module (28x13x8mm) |
The TD501D232H is an isolated RS-485 transceiver module with 250kbps data rate, 2500VDC isolation, and built-in ESD protection for industrial serial communication.
The TD501D232H is an isolated RS-485 transceiver module from u-blox/TD Semiconductor in DIP-10 form factor, combining an RS-485 transceiver with galvanic isolation in a single plug-in module. The module integrates a standard RS-485 transceiver IC with digital isolation (transformer or capacitive coupling) between the logic side (VCC, RXD, TXD, RE, DE) and the bus side (A, B). The isolation barrier provides 2500Vrms withstand voltage, protecting the MCU from ground loops and common-mode voltage transients common in industrial environments. The 250kbps data rate supports RS-485 communication up to 1200m at lower speeds. The RE (Receiver Enable, active LOW) and DE (Driver Enable, active HIGH) pins control bus direction: typically RE and DE are tied together for half-duplex operation (receive mode when LOW, transmit mode when HIGH). The module approach eliminates the need for external isolation components (optocouplers, isolated DC-DC), reducing BOM count and PCB area. The DIP-10 footprint allows through-hole mounting for easy prototyping and replacement. The ISO-GND and ISO-VCC pins provide power to the isolated bus side, either from the internal isolated supply or from an external source. Applications include industrial automation, building control, and meter reading systems.
| 针脚 | 名称 | 类型 | 功能 |
|---|---|---|---|
| 1 | VCC | 电源 | Module supply (3.3V or 5V) |
| 2 | RXD | 输出 | Receiver data output (to MCU UART RX) |
| 3 | TXD | 输入 | Transmitter data input (from MCU UART TX) |
| 4 | 接地 | 电源 | 地面 |
| 5 | A | 输入/输出 | Non-inverting RS-485 bus pin |
| 6 | B | 输入/输出 | Inverting RS-485 bus pin |
| 7 | RE | 输入 | Receiver enable (active low) |
| 8 | 可选择丢弃 | 输入 | Driver enable (active high) |
| 9-10 | ISO-GND/ISO-VCC | 电源 | Isolated side power (optional) |
| 制造商 | 部件编号 | 包装 | 说明 |
|---|---|---|---|
| u-blox | TD501D232H | DIP-10 | Same device, module format |
| TI | ISO3531DR | SOIC-16 | Isolated RS-485, 1Mbps, chip-level |
| 模拟器件公司 | ADM2587EBRWZ | SOIC-20 | Isolated RS-485, 500kbps, 2.5kV |
| 硅实验室 | SI8641BB-D-IS1 | SOIC-16 | Digital isolator + external transceiver |
| 马克西姆 | MAX14850ASE+ | SOIC-16 | Isolated RS-485, 25Mbps, chip-level |
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