SN65C3243DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN65C3243DWG4 is an RS-232 line transceiver with 3 transmitters and 5 receivers, operating from a single 3.3 V or 5 V supply with on-chip charge pump. It supports full EIA-232 voltage levels and features Schmitt-trigger inputs for noise-robust signal reception. Packaged in 28-pin SOIC, it enables compact multi-port serial communication in industrial and embedded systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- OBSOLETE
- Datasheet
- SN65C3243DWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN65C3243DWG4?
- 3 RS-232 transmitters and 5 receivers in a single 28-pin package
- Single 3.3 V supply with internal charge pump generating ±5.5 V RS-232 levels
- Also operates at 5 V supply for legacy system compatibility
- Schmitt-trigger receiver inputs for noise-immune signal detection
- EIA-232 compliant output voltage levels up to ±5.5 V
- Low 1 µA maximum input leakage current reducing loading on serial lines
What is SN65C3243DWG4 used for?
The SN65C3243DWG4 enables multi-port RS-232 serial communication in embedded systems, industrial controllers, and telecommunications equipment operating from a 3.3 V supply. Its 3 transmitter and 5 receiver channel count supports applications requiring simultaneous COM port connections to modems, GPS receivers, and barcode scanners from a single IC. The device is also used in legacy equipment upgrades where 5 V RS-232 compatibility is required alongside modern low-voltage processor interfaces.
What are the specifications of SN65C3243DWG4?
| YTEOL | 0 |
| Additional Feature | ALSO OPERATES AT 5V SUPPLY |
| Differential Output | NO |
| Driver Number of Bits | 3 |
| High Level Input Current-Max | 0.000001A |
| Input Characteristics | SCHMITT TRIGGER |
| Interface IC Type | LINE TRANSCEIVER |
| Interface Standard | EIA-232 |
| JESD-30 Code | R-PDSO-G28 |
| JESD-609 Code | e4 |
| Number of Functions | 3 |
| Out Swing-Min | 10V |
| Output Characteristics | 3-STATE |
| Output Low Current-Max | 0.000001A |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP28,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Receiver Number of Bits | 5 |
| Supply Current-Max | 1mA |
| Supply Voltage-Max | 3.6V |
| Supply Voltage-Min | 3V |
| Supply Voltage-Nom | 3.3V |
| Supply Voltage1-Max | 3.6V |
| Supply Voltage1-Min | 3V |
| Supply Voltage1-Nom | 3.3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the SN65C3243DWG4 datasheet?
SN65C3243DWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN65C3243DWG4?
Compatible alternatives and drop-in replacements for SN65C3243DWG4:
Frequently Asked Questions
How does the SN65C3243DWG4 generate RS-232 voltage levels from a 3.3 V supply without an external power supply?
The device integrates an on-chip charge pump with external capacitors to boost the 3.3 V input supply to the ±5.5 V levels required by EIA-232 transmitters. This eliminates the need for a separate ±12 V supply rail, reducing BOM count and simplifying PCB design. The charge pump requires only four small external capacitors, typically 0.1 µF each, to generate compliant RS-232 output swings.
For a design connecting to 5 external serial devices, does this transceiver provide enough receiver channels without adding another IC?
The SN65C3243DWG4 provides exactly 5 RS-232 receiver channels alongside 3 transmitter channels, making it possible to receive data from 5 external devices simultaneously. This asymmetric channel count matches common GPS, modem, barcode scanner, and sensor terminal configurations where more incoming data streams than outgoing command channels are needed, all within a single 28-pin SOIC footprint.
Why does using Schmitt-trigger inputs on the receivers improve signal integrity in noisy industrial environments?
Schmitt-trigger inputs apply hysteresis to the logic threshold, typically 0.5 V on the input transition band, preventing multiple spurious switching events when the RS-232 signal transitions through the threshold slowly or contains superimposed noise. In industrial environments with high-frequency switching power supplies or long cable runs exceeding 3 meters, this hysteresis ensures clean, glitch-free received data even when signal edges are degraded.
Can this transceiver operate at both 3.3 V and 5 V logic supplies, and how does that help in mixed-voltage board designs?
The device supports both 3.3 V and 5 V VCC operation, with the internal charge pump adjusting to provide adequate RS-232 swing in both cases. On a mixed-voltage PCB where the processor runs at 3.3 V and legacy serial peripherals require 5 V RS-232 compatibility, the SN65C3243DWG4 bridges both domains without additional level-shifting circuitry, simplifying the board power architecture.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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