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Home > Products > Integrated Circuits (ICs) > Interface > Drivers, Receivers, Transceivers

STMicroelectronics ST3222CTR

Name: ST3222CTR
Brand: STMicroelectronics
SKU: ST3222CTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST3222CTR

Manufacturer:: STMicroelectronics

Category:: Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: ST3222CTR.pdf

Description:: IC TRANSCEIVER FULL 2/2 20TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,276

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Product details

Overview

ST3222CTR from STMicroelectronics is a 3.0–3.6 V, low-power RS-232 transceiver IC with two drivers and two receivers, 300 µA supply current, 250 kbps guaranteed data rate, and integrated charge pump requiring only four 0.1 µF capacitors. It supports true RS-232 voltage levels (±5.4 V) from a single 3 V supply and features active-receiver monitoring in 1 mA shutdown mode for battery-powered peripherals.

For engineers reviewing the ST3222CTR datasheet, ST3222CTR pinout, ST3222CTR application, or ST3222CTR equivalent, key selection considerations include its TSSOP20 package, 6 V/µs minimum slew rate, ±25 V receiver input tolerance, and EN/SHDN control logic compatibility with 3.3 V microcontrollers in portable serial interface designs.

Technical Context

The ST3222CTR implements a dual-charge-pump architecture generating ±5.5 V rails internally to drive RS-232 outputs while maintaining EIA/TIA-232 compliance down to 3 V supply. Its transmitter output stage uses low-dropout design to sustain ±5 V swing into 3 kΩ loads.

Receiver inputs tolerate ±25 V common-mode range with 3–7 kΩ input resistance and 0.5 V hysteresis; logic-level outputs are TTL/CMOS-compatible with V_OH ≥ V_CC−0.6 V and V_OL ≤ 0.4 V at specified load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.0–3.6 V - enables direct integration with 3.3 V system rails without level-shifting
Supply Current (Active)	300 µA - extends battery life in portable devices such as handheld terminals
Data Rate	250 kbps min., 400 kbps typical - supports high-speed serial links in printers and modems
Slew Rate	6 V/µs min. - ensures clean signal edges and reduced EMI in noisy industrial environments
Receiver Input Range	±25 V - provides robust noise immunity and fault tolerance on long RS-232 cables
Transmitter Output Swing	±5.4 V into 3 kΩ - meets full RS-232 specification for interoperability with legacy equipment
Shutdown Current	1 µA - allows ultra-low-power sleep states while retaining receiver monitoring capability

Pinout & Package

ST3222CTR is housed in a 20-pin TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch), RoHS-compliant and ECOPACK® certified.

Pin/Terminal	Circuit Role	Design Meaning
1 EN	Receiver enable control	Active-low input enabling/disabling receiver outputs; high = high-Z state
2 C1+, 4 C1−, 5 C2+, 6 C2−	Charge pump capacitor terminals	Interface external 0.1 µF capacitors to generate ±5.5 V internal rails
3 V+, 7 V−	Generated voltage rails	Internal +5.5 V and −5.5 V outputs powering RS-232 drivers
8 T2OUT, 17 T1OUT	Transmitter outputs	RS-232-compliant differential outputs driving TxD/RxD lines
9 R2IN, 16 R1IN	Receiver inputs	Accept ±25 V RS-232 signals; convert to TTL/CMOS logic levels
10 R2OUT, 15 R1OUT	Receiver outputs	TTL/CMOS-compatible logic outputs (V_OH ≥ V_CC−0.6 V, V_OL ≤ 0.4 V)
12 T2IN, 13 T1IN	Transmitter inputs	Accept 3.3 V logic inputs; include 250 mV hysteresis for noise rejection
18 GND	Ground reference	Common return path for all analog and digital circuitry
19 VCC	Primary supply	3.0–3.6 V input powering logic core and charge pump controller
20 SHDN	Shutdown control	Active-low input disabling transmitters and charge pump; receivers remain active if EN = low

Key Features

Feature	Design Value
Single-supply RS-232 operation	Eliminates need for ±12 V supplies - reduces BOM count and board space in portable systems
Low-power shutdown with active monitoring	1 µA shutdown current while keeping receivers operational - enables wake-on-ring in modems and terminals
Guaranteed 250 kbps data rate	Ensures reliable communication over 15 m cables at full spec, even under worst-case temperature/voltage
Integrated dual charge pump	Generates ±5.5 V rails using only four 0.1 µF ceramic capacitors - simplifies layout and improves reliability
±25 V receiver input tolerance	Withstands ESD and line faults without external protection - reduces need for TVS diodes in cost-sensitive designs

Applications

Industrial Serial Gateways

Point-of-Sale Terminals

Use Scenario: Connecting PLCs and HMIs via RS-232 in factory automation cabinets with limited power budgets.

IC Role / Device Role / Timing Role: Dual-channel transceiver converting 3.3 V UART signals to full RS-232 voltage levels while sustaining 250 kbps throughput.

Use Value: Enables drop-in replacement of legacy ±12 V transceivers without redesigning power delivery, reducing time-to-market.

Use Scenario: Integrating barcode scanners and receipt printers into compact, battery-backed retail terminals.

IC Role / Device Role / Timing Role: Low-quiescent-current RS-232 interface managing bidirectional peripheral communication during intermittent polling cycles.

Use Value: 300 µA active current and 1 µA shutdown extend battery runtime beyond 12 months in always-on retail deployments.

Medical Handheld Diagnostics

Test & Measurement Equipment

Use Scenario: Enabling firmware updates and log retrieval from portable ECG monitors using standard PC COM ports.

IC Role / Device Role / Timing Role: Isolated RS-232 bridge with ±25 V input tolerance protecting sensitive analog front-end from cable-induced transients.

Use Value: Eliminates need for external surge protection components, meeting IEC 60601-1 creepage/clearance requirements in Class II devices.

Use Scenario: Interfacing oscilloscopes and multimeters with host PCs via RS-232 for remote control and data capture.

IC Role / Device Role / Timing Role: High-slew-rate (6 V/µs) transceiver ensuring signal integrity across variable-length cables in lab environments.

Use Value: Maintains <100 ns transmitter skew and <50 ns receiver skew - critical for synchronized command-response timing in automated test systems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar RS-232 transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3222CSE+	Higher 1 µA shutdown current; identical 3 V operation and TSSOP20 package	Wider industrial temp range (−40°C to +85°C) vs. ST3222CTR's 0°C to +70°C	Select for extended temperature deployments where ambient exceeds 70°C
SP3222ECA-L	Lower 150 µA active supply current; same 250 kbps guarantee and ±25 V input rating	Includes auto-power-down mode that disables charge pump when TX/RX idle >30 µs	Select for ultra-low-power applications where average current must stay below 200 µA

Compared with MAX3222CSE+ and SP3222ECA-L, ST3222CTR offers the lowest bill-of-materials cost due to minimal external component count (four 0.1 µF caps only) and optimized 300 µA active current for mid-duty-cycle portable use cases.

Availability

ST3222CTR is available at Aetrix Electronics and suitable for industrial serial gateways, point-of-sale terminals, medical handheld diagnostics, and test & measurement equipment requiring stable component supply and long-term production continuity.

Supply support for ST3222CTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management, and discrete components for industrial, automotive, and consumer markets.

The ST3222CTR belongs to ST's RS-232 interface product line, engineered specifically for low-voltage, low-power serial communication in portable and battery-operated systems where space, energy efficiency, and EIA/TIA-232 compliance are critical.

FAQ

What external components are required for ST3222CTR operation?

The ST3222CTR requires exactly four 0.1 µF ceramic capacitors: two for the C1+/C1− and C2+/C2− charge pump stages, plus one 0.1 µF bypass capacitor on VCC. No inductors, transformers, or high-voltage supplies are needed - all RS-232 voltage generation is internal.

Can ST3222CTR operate from a 3.3 V supply while driving standard RS-232 loads?

Yes. The ST3222CTR guarantees ±5 V output swing into 3 kΩ loads at 3.3 V supply, fully compliant with EIA/TIA-232-F specifications. Its proprietary low-dropout transmitter stage maintains this performance across the full 3.0–3.6 V range without derating.

How does the EN pin interact with SHDN in low-power modes?

When SHDN = high, transmitters and charge pump are active; EN controls only receiver output state (EN = low → receivers enabled). When SHDN = low, transmitters and charge pump disable, but receivers remain functional if EN = low - enabling modem status monitoring at 1 mA total current.

Is ST3222CTR pin-compatible with older ST3222B or ST3222C variants?

Yes. ST3222CTR shares identical pinout, electrical characteristics, and package (TSSOP20) with ST3222BTR and ST3222CTR - differing only in temperature grade (0°C to +70°C) and tape-and-reel packaging (2500 units/reel). No PCB or firmware changes are required for substitution.

ST3222CTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Transceiver

Protocol:: RS232

Number of Drivers/Receivers:: 2/2

Duplex:: Full

Receiver Hysteresis:: 500 mV

Data Rate:: 250kbps

Voltage - Supply:: 3V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

ST3222CTR FAQ

1.How can I place an order for ST3222CTR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST3222CTR 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 ST3222CTR reliable?

The price and inventory of ST3222CTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST3222CTR is usually 5 days.

3.What payment methods are accepted for ST3222CTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST3222CTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST3222CTR?

ST3222CTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST3222CTR 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 ST3222CTR?

For technical support, including ST3222CTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST3222CTR requirements.

6.How does Aetrix verify that ST3222CTR is sourced from the original manufacturer or authorized distributors?

All ST3222CTR 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 ST3222CTR meets industry standards.

7.What is the process for return or replacement of ST3222CTR?

All ST3222CTR units undergo pre-shipment inspection (PSI). If there is an issue with ST3222CTR, 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 ST3222CTR part is unused and in its original packaging.

Return procedure for ST3222CTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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