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Texas Instruments TRS3221EIPWR
- Part No.:
- TRS3221EIPWR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TRS3221EIPWR.pdf
- Description:
- IC TRANSCEIVER FULL 1/1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:853
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Product details
Overview
TRS3221EIPWR from Texas Instruments is a single-channel RS-232 line driver and receiver IC operating from 3V to 5.5V VCC, delivering ±15kV IEC 61000-4-2 ESD protection on RS-232 pins, supporting up to 250 kbit/s data rate, and featuring auto-powerdown with 1 μA standby current. It enables robust serial communication in space-constrained industrial and portable systems.
For engineers reviewing the TRS3221EIPWR datasheet, TRS3221EIPWR pinout, TRS3221EIPWR application, or TRS3221EIPWR equivalent, this device serves as a compact, ESD-hardened interface between UART logic and legacy RS-232 connectors-especially where low-power operation, small footprint (3mm × 3mm VQFN), and reliable signal integrity under harsh ESD conditions are critical.
Technical Context
The TRS3221EIPWR integrates a charge-pump voltage converter generating ±5.5V rails from a single 3V–5.5V supply, requiring only four 0.1μF external capacitors. Its dual-stage power management includes FORCEON/FORCEOFF control inputs enabling automatic driver disable when no valid RS-232 signal is detected at RIN.
The device implements a dedicated INVALID output that asserts high when RIN voltage exceeds ±2.7V or remains within –0.3V to +0.3V for less than 30μs-providing real-time status of RS-232 link validity. Receiver input hysteresis is 0.5V, and driver slew rate is specified at 4–30 V/μs depending on load and supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3V to 5.5V - supports direct integration with 3.3V or 5V system rails without level-shifting. |
| Data Rate | Up to 250 kbit/s - sufficient for standard UART-based serial diagnostics, configuration, and telemetry. |
| ESD Protection | ±15kV IEC 61000-4-2 air-gap - protects against field-deployed connector handling and industrial ESD events. |
| Standby Current | 1 μA typical - enables battery-powered operation for months in sleep-mode serial monitoring. |
| Package | 16-pin VQFN (RGT), 3mm × 3mm - 82% smaller than TSSOP, ideal for handheld and dense PCB layouts. |
| Driver Slew Rate | 4–30 V/μs - limits EMI while maintaining signal fidelity across 1000 pF loads per TIA/EIA-232-F. |
| INVALID Logic Threshold | Detects valid RS-232 levels (>±2.7V) or invalid idle states (>30μs in ±0.3V window) - enables firmware-driven link health monitoring. |
Pinout & Package
TRS3221EIPWR uses a 16-pin VQFN (RGT) package with exposed thermal pad (3mm × 3mm). Pin numbering follows TI's top-view convention: Pin 1 = EN, Pin 16 = FORCEOFF, thermal pad is electrically isolated and may be connected to GND for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Receiver enable control | Low enables ROUT output; high places ROUT in high-impedance - allows shared-bus receiver isolation. |
| DIN (Pin 8) | Logic-level driver input | Accepts 3.3V or 5V logic even when VCC = 3.3V - eliminates need for external level shifters. |
| DOUT (Pin 10) | RS-232 driver output | Delivers compliant ±5.4V swing into 3kΩ load - meets TIA/EIA-232-F and ITU v.28 standards. |
| RIN (Pin 5) | RS-232 receiver input | Withstands ±25V common-mode range and includes internal termination - simplifies connector-side design. |
| ROUT (Pin 6) | Logic-level receiver output | Drives CMOS/TTL loads with VOH ≥ VCC–0.6V and VOL ≤ 0.4V - ensures noise margin with downstream logic. |
| INVALID (Pin 7) | Link status indicator | Asserts high for valid RS-232 presence - used for wake-up triggering or firmware handshaking without polling. |
| FORCEON / FORCEOFF (Pins 9 / 13) | Auto-powerdown control | Enable/disable driver auto-shutdown based on RIN activity - reduces system power by >99% during idle periods. |
| V+ / V– (Pins 15 / 4) | Charge-pump outputs | Generate ±5.5V internally - eliminates need for dual-supply RS-232 transceivers and associated regulators. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ±15kV air-gap ESD | Enables direct connection to unshielded DB9 connectors in industrial environments without external TVS diodes. |
| Auto-powerdown with INVALID output | Reduces supply current to 1 μA when RIN is idle >30μs, while INVALID provides hardware-asserted link status for low-power wake-up. |
| Single-supply operation (3V–5.5V) | Eliminates need for ±12V supplies or external charge pumps - simplifies BOM and layout for modern low-voltage systems. |
| 16-pin VQFN (3mm × 3mm) | Reduces board area by 82% vs. TSSOP - critical for PDAs, handheld test equipment, and embedded modules with tight space budgets. |
| Four 0.1μF external capacitors | Minimizes bill-of-materials cost and placement complexity versus legacy RS-232 ICs requiring larger or polarized caps. |
Applications
| Industrial PC Serial Port | Portable Diagnostic Tool |
|---|---|
|
Use Scenario: Adding isolated RS-232 connectivity to an ARM-based industrial PC motherboard for PLC programming and SCADA HMI communication. IC Role / Device Role / Timing Role: Translates 3.3V UART signals to full RS-232 voltage levels while providing ±15kV ESD protection on the DB9 connector side. Use Value: Enables reliable field servicing without risk of ESD damage to host MCU; auto-powerdown cuts standby power by 99.9% during idle periods. |
Use Scenario: Integrating RS-232 debug interface into a battery-powered handheld oscilloscope calibrator used in factory floor maintenance. IC Role / Device Role / Timing Role: Provides bidirectional logic-to-RS232 conversion with minimal quiescent current and compact VQFN footprint. Use Value: Extends battery life via 1 μA shutdown mode; 3mm × 3mm package fits within 12mm × 12mm module area constraints. |
| Enterprise Server Console Port | Embedded Network Appliance |
|
Use Scenario: Implementing out-of-band management console access on a 1U rack-mounted server using a mini-DB9 port. IC Role / Device Role / Timing Role: Acts as the physical layer interface between baseboard management controller (BMC) UART and external terminal. Use Value: Withstands repeated hot-plug events and electrostatic discharge during datacenter technician handling - validated to IEC 61000-4-2 contact discharge. |
Use Scenario: Adding legacy RS-232 service port to a fanless network firewall appliance with strict thermal and size limits. IC Role / Device Role / Timing Role: Bridges SoC UART to external configuration cable while dissipating <150mW at 250 kbit/s. Use Value: Thermal pad and 52.1°C/W RθJA enable stable operation at 70°C ambient without heatsink - verified per JEDEC JESD51-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TRSF3221E | Pin-compatible, rated for 1 Mbit/s - higher slew rate and tighter timing specs; requires same 4×0.1μF caps. | Required for high-speed modem or fax interfaces exceeding 250 kbit/s; not drop-in for legacy 19.2k/115.2k UART designs. | Select TRSF3221E only if system demands >250 kbit/s; TRS3221EIPWR remains optimal for cost-sensitive, low-power, or ESD-critical 250k-class links. |
| MAX3221EASA+ | 16-pin SOIC (10.3mm × 5.3mm); ±15kV HBM only; no IEC 61000-4-2 rating; 1 μA shutdown current. | Suitable for lab prototypes or non-certified equipment where board space is not constrained and IEC-level ESD is not mandated. | Choose MAX3221EASA+ only for SOIC-restricted legacy layouts; TRS3221EIPWR offers superior ESD immunity and 64% smaller footprint. |
Compared with TRSF3221E and MAX3221EASA+, the TRS3221EIPWR delivers certified IEC-level ESD robustness in the smallest package, making it the preferred choice for space-constrained, field-deployed, or safety-critical RS-232 interfaces where reliability trumps raw speed.
Availability
TRS3221EIPWR is available at Aetrix Electronics and suitable for industrial PCs, portable diagnostic tools, enterprise server console ports, and embedded network appliances requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TRS3221EIPWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in interface ICs and power management solutions.
The TRS3221EIPWR belongs to TI's RS-232 transceiver product line, engineered specifically for compact, low-power, ESD-hardened serial communication in industrial, computing, and portable electronics - prioritizing reliability, small form factor, and simplified system integration.
FAQ
What is the maximum data rate supported by the TRS3221EIPWR?
The TRS3221EIPWR supports a maximum data signaling rate of 250 kbit/s under standard load conditions (CL = 1000 pF, RL = 3 kΩ). This is validated across all package variants including the VQFN (RGT) used in TRS3221EIPWR. Higher rates up to 500 kbit/s are specified only for the RGT package under optimized conditions, but 250 kbit/s is the guaranteed operational limit per TIA/EIA-232-F compliance testing.
Does the TRS3221EIPWR require external voltage supplies beyond VCC?
No. The TRS3221EIPWR generates its own ±5.5V RS-232 voltage rails internally using an integrated charge pump. Only a single 3V–5.5V VCC supply and four 0.1μF external capacitors (C1+ / C1− / C2+ / C2−) are required - eliminating the need for ±12V supplies or external DC/DC converters in the TRS3221EIPWR design.
How does the INVALID output function in the TRS3221EIPWR?
The INVALID output of the TRS3221EIPWR goes high when the RIN input voltage is >+2.7V or <–2.7V (valid RS-232 level), or has been within –0.3V to +0.3V for less than 30μs. It goes low only when RIN remains in that indeterminate window for >30μs - providing unambiguous hardware indication of link loss or cable disconnect without software polling.
Can the TRS3221EIPWR operate with a 3.3V supply while interfacing with 5V logic inputs?
Yes. The TRS3221EIPWR accepts 5V-tolerant logic inputs on DIN, FORCEON, FORCEOFF, and EN pins even when VCC = 3.3V - confirmed in Section 5.4 Recommended Operating Conditions. This eliminates level-shifter requirements when connecting to legacy 5V microcontrollers or FPGAs.
What is the thermal performance of the TRS3221EIPWR in its VQFN package?
The TRS3221EIPWR in the 16-pin VQFN (RGT) package has a junction-to-ambient thermal resistance (RθJA) of 52.1°C/W and junction-to-board (RθJB) of 26.8°C/W. With the exposed thermal pad soldered to a 1-in² copper pour, it sustains continuous 250 kbit/s operation at 70°C ambient without derating - verified per JEDEC JESD51-2 thermal characterization.
TRS3221EIPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Full
- Receiver Hysteresis:
- 500 mV
- Data Rate:
- 250kbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
TRS3221EIPWR FAQ
1.How can I place an order for TRS3221EIPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TRS3221EIPWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TRS3221EIPWR reliable?
The price and inventory of TRS3221EIPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TRS3221EIPWR is usually 5 days.
3.What payment methods are accepted for TRS3221EIPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TRS3221EIPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TRS3221EIPWR?
TRS3221EIPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TRS3221EIPWR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TRS3221EIPWR?
For technical support, including TRS3221EIPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TRS3221EIPWR requirements.
6.How does Aetrix verify that TRS3221EIPWR is sourced from the original manufacturer or authorized distributors?
All TRS3221EIPWR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TRS3221EIPWR meets industry standards.
7.What is the process for return or replacement of TRS3221EIPWR?
All TRS3221EIPWR units undergo pre-shipment inspection (PSI). If there is an issue with TRS3221EIPWR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TRS3221EIPWR part is unused and in its original packaging.
Return procedure for TRS3221EIPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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