ST3243ECTR-E

ST3243ECTR-E is a STMicroelectronics RS-232 transceiver. It provides the electrical bridge between a microcontroller’s TTL/CMOS UART and RS-232 serial lines, handling both level shifting and signal driving/receiving.
Key points:
- Single-supply operation with an internal charge pump to generate RS-232 voltage levels from a low-voltage rail.
- Bi-directional data paths, suitable for UART interfaces.
- Extended temperature range (ECTR) for industrial conditions; typical packaging options (e.g., 8-pin) are common.
- 3-state outputs and standard RS-232 signaling (positive/negative voltages) for reliable long-distance or multi-device connections.
Common uses:
- Microcontroller to PC/modem serial links
- Data acquisition or industrial control interfaces
- Embedded systems requiring RS-232 connectivity
Notes:
- Check the exact electrical specs (supply range, data rate, capacitor values) in the datasheet or ST product selector for your application.

Equivalents (RS-232 quad transceivers, pin-compatible with ST3243ECTR-E):
- MAX3243E (Maxim Integrated)
- SP3243/SP3243E (Exar/Sipex)
- ADM3243 (Analog Devices)

Here are core features of ST3243ECTR-E (RS-232 transceiver):
- Quad RS-232 transceiver (4 drivers and 4 receivers)
- Single-supply operation: 3.0 V to 5.5 V (logic compatible with 3.3 V)
- On-chip charge pump to generate RS-232 voltage levels
- TTL/CMOS-compatible input thresholds
- RS-232 compliant output swing with full voltage levels
- Integrated protections: ESD on I/O pins
- Low power consumption with standby/shutdown option
- Extended operating temperature range (-40°C to 125°C)
- Packaging: Tape-and-Reel option available (CTR/TR variant)

- Pin count: 16 pins (16-pin package, e.g., SO-16).
- Function: Dual RS-232 transceiver (two drivers and two receivers) that converts TTL/CMOS logic levels to RS-232 voltage levels and vice versa, using an internal charge pump to generate the required RS-232 voltages.

Manufacturer: STMicroelectronics (STMicroelectronics N.V.).
What kind of company: A global semiconductor company that designs, develops, manufactures, and sells integrated circuits and other semiconductors for automotive, industrial, consumer, and communication markets (headquartered in Geneva, Switzerland).

ST3243ECTR-E is a quad RS-232 transceiver. Applications include:
- RS-232 interfaces for microcontroller-based systems
- Data terminal equipment (PCs, modems, printers, network gear)
- Industrial automation and process control
- Instrumentation and test equipment
- Point-of-sale terminals
- Telecom and networking equipment
- Embedded/portable devices requiring 3.3V/5V RS-232 transceivers

ST3243ECTR-E is in a 16-pin RoHS, surface‑mount SO‑16 package (Tape & Reel).