The ST3232BTR is a full RS-232 transceiver device offering two drivers and two receivers, enabling TTL/CMOS ↔ RS-232 level translation in both directions. It is designed for low power consumption, drawing only ~300 µA of supply current in no-load conditions, making it well suited for portable and battery-powered systems.
Operating from a supply voltage range of 3.0 V to 5.5 V, it retains full RS-232 performance even at lower voltages. The internal charge-pump circuitry requires only four small external capacitors to generate the necessary ± voltages for the RS-232 drivers.
The ST3232BTR can support data rates up to 400 kbps (with a guaranteed minimum of 300 kbps). It ensures proper slew rate (≥ 6 V/µs) to meet RS-232 timing and signal integrity demands.
Key Features & Specifications
| Parameter | Value / Characteristic |
|---|---|
| Manufacturer | STMicroelectronics |
| Manufacturer Part Number | ST3232BTR |
| Number of Drivers / Receivers | 2 drivers, 2 receivers |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| Supply Current (no load) | ~300 µA typical |
| Guaranteed Minimum Data Rate | 300 kbps |
| Typical Maximum Data Rate | 400 kbps |
| Slew Rate (drivers) | ≥ 6 V/µs |
| Driver Output Levels | ±5 V (and higher, to meet RS-232 spec) |
| Receiver Input Range | ±25 V |
| Package | 16-lead TSSOP |
| Operating Temperature | –40 °C to +85 °C |
| External Capacitors Required | 4 × 0.1 µF (charge pump) |
| ESD / Protection | Meets RS-232 interface standards (internal protections) |
Applications & Use-Cases
The ST3232BTR is well suited for any design that needs robust, low-power serial communication between TTL/CMOS logic and external devices using RS-232 signaling. Typical applications include:
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Embedded systems and microcontroller boards needing serial port connectivity
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Battery-powered / portable instrumentation, data loggers, handheld devices
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Serial interface modules, USB-to-serial converters
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Industrial control systems interfacing with legacy RS-232 equipment
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Peripheral devices like printers, modems, POS terminals, sensors
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Communication bridges between digital logic and RS-232 “legacy” interfaces
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