SN65C3221PWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN65C3221PWG4 is a multi-channel EIA-232 RS-232 transceiver operating from 3V to 5.5V supply with Schmitt trigger inputs for enhanced noise immunity. It integrates charge pump circuitry to generate RS-232 voltage levels from low-voltage logic rails in a 16-pin SOIC package. Suitable for serial port interfaces in industrial terminals, embedded systems, and test equipment.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN65C3221PWG4 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 SN65C3221PWG4?
- 3V to 5.5V dual-supply operation with integrated charge pump generating ±5V RS-232 output levels
- Schmitt trigger receiver inputs providing 0.5V hysteresis for reliable data recovery in noisy environments
- Multi-channel RS-232 transceiver with driver and receiver pairs for full-duplex serial port implementation
- EIA-232 compliant output voltage swing meeting ±5V minimum from low-voltage 3.3V logic supply
- 16-pin SOIC package enabling board-level RS-232 interface without external voltage converters
What is SN65C3221PWG4 used for?
The SN65C3221PWG4 is designed for serial RS-232 port implementation in embedded microcontroller systems, industrial HMI terminals, and legacy device interfaces requiring standard EIA-232 voltage levels from 3.3V or 5V logic supplies. Its integrated charge pump eliminates external boost converters, simplifying RS-232 interfaces in space-constrained PCB designs for modems, GPS receivers, and barcode scanners. The Schmitt trigger inputs provide robust communication over long cables in electrically noisy factory and laboratory environments.
What are the specifications of SN65C3221PWG4?
| YTEOL | 0 |
| Additional Feature | CAN ALSO OPERATE WITH A 5V SUPPLY |
| Differential Output | NO |
| Driver Number of Bits | 1 |
| 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-G16 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Out Swing-Min | 10V |
| Output Characteristics | 3-STATE |
| Output Low Current-Max | 0.0016A |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Receiver Number of Bits | 1 |
| 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 | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| 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 SN65C3221PWG4 datasheet?
SN65C3221PWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN65C3221PWG4?
Compatible alternatives and drop-in replacements for SN65C3221PWG4:
Frequently Asked Questions
What supply voltage range does the SN65C3221PWG4 accept and how does it generate RS-232 output levels from 3.3V logic?
The SN65C3221PWG4 operates from 3V to 5.5V and uses an internal charge pump with external 0.1 µF capacitors to boost the supply to ±5V for RS-232 driver outputs. This meets the EIA-232 minimum ±5V differential requirement, allowing direct connection to DB-9 serial port connectors from a 3.3V microcontroller supply without any external voltage regulator or inverter.
How do Schmitt trigger inputs in the SN65C3221PWG4 improve signal integrity on long RS-232 cable runs?
The SN65C3221PWG4 receiver inputs include Schmitt trigger hysteresis of approximately 0.5V, preventing false triggering from noise, reflections, and ground level shifts on cables up to 15 meters or more. In industrial environments with switching power supplies and motor drives generating electromagnetic interference, the hysteresis provides a noise margin that eliminates the bit errors common with standard threshold comparators in RS-232 receivers.
How many driver and receiver channels does the SN65C3221PWG4 integrate and what serial port configurations does this support?
The SN65C3221PWG4 provides multiple RS-232 driver and receiver channels in a single 16-pin SOIC, typically supporting 1 full-duplex UART channel with RXD, TXD, and handshake lines including RTS and CTS. This integration enables complete RS-232 port implementation for 9-wire or 4-wire serial interfaces in embedded modems, GNSS receivers, and legacy industrial equipment communication adapters.
Is the SN65C3221PWG4 suitable for designs requiring both 3.3V and 5V system compatibility and how does this affect component selection?
The SN65C3221PWG4 operates across 3V to 5.5V, making it directly compatible with both 3.3V and 5V microcontroller I/O without level shifting. The logic input thresholds track the supply voltage, so the same PCB design works with both voltage standards. Only 4 external 0.1 µF charge pump capacitors are needed, simplifying BOM and reducing component count compared to discrete voltage converters in mixed-voltage RS-232 interface designs.
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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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