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STMicroelectronics ST3222EBTR
- Part No.:
- ST3222EBTR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ST3222EBTR.pdf
- Description:
- IC TRANSCEIVER FULL 2/2 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,350
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Product details
Overview
ST3222EBTR from STMicroelectronics is a ±15 kV ESD-protected, 3–5.5 V low-power RS-232 transceiver IC with dual drivers and dual receivers, 250 Kbps guaranteed data rate, 6 V/µs minimum slew rate, and 300 µA supply current. It operates across –40 to +85 °C and supports battery-powered portable systems requiring true RS-232 signaling from single-supply rails.
For engineers reviewing the ST3222EBTR datasheet, ST3222EBTR pinout, ST3222EBTR application, or ST3222EBTR equivalent, key selection considerations include shutdown current (1 µA), receiver input voltage range (±25 V), EN/SHDN logic control behavior, and TSSOP20 package compatibility with space-constrained PCB layouts.
Technical Context
The ST3222EBTR integrates a dual charge pump generating ±5.5 V from 3–5.5 V VCC, enabling compliant RS-232 output swing (±5 V) without external high-voltage supplies. Its proprietary low-dropout transmitter stage maintains full drive capability down to 3 V.
It features independent enable (EN) and shutdown (SHDN) controls: SHDN disables transmitters and charge pump (1 µA mode), while EN places receivers in high-Z state without affecting transmitter operation-enabling modem monitoring during low-power states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - enables direct integration into modern low-voltage embedded systems without level-shifting. |
| Data Rate | 250 Kbps min - guarantees reliable full-duplex serial communication for industrial modems and point-of-sale terminals. |
| ESD Protection | ±15 kV HBM, ±8 kV IEC 1000-4-2 - eliminates need for external TVS diodes on RS-232 I/O lines. |
| Supply Current | 300 µA typical - extends battery life in handheld medical devices and portable test equipment. |
| Slew Rate | 6 V/µs min - reduces electromagnetic interference (EMI) while maintaining signal integrity over long cables. |
| Receiver Input Range | ±25 V - tolerates large ground potential differences between connected equipment in factory-floor environments. |
| Shutdown Current | 1 µA max - allows deep-sleep operation in always-on IoT gateways with wake-on-RX capability. |
Pinout & Package
TSSOP20 package: 6.5 mm × 4.4 mm, 0.65 mm pitch, lead-free ECOPACK® compliant, optimized for automated SMT assembly and thermal performance in compact designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Receiver enable control | Active-low; places R1OUT/R2OUT in high-impedance state while transmitters remain operational. |
| 19 VCC | Positive supply input | 3–5.5 V main power rail; powers logic core, receivers, and charge pump controller. |
| 18 GND | Ground reference | Common return path for all internal circuits and external capacitors C1–C4. |
| 20 SHDN | Active-low shutdown | Disables transmitters and charge pump; receivers remain active if EN = low (1 µA mode). |
| 8,17 T2OUT/T1OUT | RS-232 driver outputs | Deliver ±5 V swing into 3 kΩ load; meet EIA/TIA-232 voltage compliance at 250 Kbps. |
| 9,16 R2IN/R1IN | RS-232 receiver inputs | Accept ±25 V input range; hysteresis (0.5 V) prevents noise-induced false triggering. |
| 10,15 R2OUT/R1OUT | Logic-level receiver outputs | CMOS-compatible outputs (VOL ≤ 0.4 V, VOH ≥ VCC–0.6 V) interface directly with microcontrollers. |
| 2,4,5,6 C1+/C1−/C2+/C2− | Charge pump capacitor terminals | Support dual-stage voltage generation (V+ ≈ +5.5 V, V− ≈ −5.5 V) using four 0.1 µF ceramic caps. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent control | Separate EN and SHDN pins allow selective receiver disable and full system shutdown-critical for modem handshaking in sleep/wake protocols. |
| True 3 V RS-232 compliance | Guaranteed ±5 V output swing and 250 Kbps operation at VCC = 3 V-enables direct replacement of legacy 5 V transceivers in brownout-prone systems. |
| Low EMI slew rate | 6 V/µs minimum controlled transition rate reduces radiated emissions, easing EMC certification for medical and industrial equipment. |
| High-impedance receiver outputs | R_OUT pins enter high-Z when EN = high-prevents bus contention in multi-drop RS-232 configurations with shared RX lines. |
Applications
| Industrial Modem Interface | Portable Diagnostic Equipment |
|---|---|
Use Scenario: Connecting PLCs to remote telemetry modems over noisy factory wiring with ground offsets up to ±10 V. IC Role / Device Role / Timing Role: Dual-driver/dual-receiver RS-232 physical layer interface with ±25 V input tolerance and ESD-hardened I/O. Use Value: Eliminates external protection components and sustains 250 Kbps throughput despite cable-induced transients and ESD events. | Use Scenario: Battery-powered handheld ECG monitor transmitting waveform data to PC via RS-232 cable. IC Role / Device Role / Timing Role: Low-power transceiver managing UART-to-RS232 conversion with 300 µA active current and 1 µA shutdown mode. Use Value: Extends single-charge battery life beyond 72 hours while maintaining full RS-232 voltage compliance for legacy host compatibility. |
| Point-of-Sale Terminal | Embedded Print Controller |
Use Scenario: Integrating magnetic stripe reader and receipt printer into compact retail terminal with shared RS-232 bus. IC Role / Device Role / Timing Role: Dual-channel transceiver supporting simultaneous TX/RX with independent EN control for bus arbitration. Use Value: Enables hot-plug detection of peripherals via active receivers during SHDN mode-reducing boot-time latency. | Use Scenario: Controlling thermal label printer in warehouse automation system exposed to electrostatic discharge during operator handling. IC Role / Device Role / Timing Role: ESD-hardened RS-232 interface with ±15 kV HBM protection on all I/O pins. Use Value: Prevents field failures due to operator-induced ESD without adding discrete protection diodes or layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3222ESE+ | Higher shutdown current (10 µA vs. 1 µA); identical 250 Kbps rating and ±15 kV ESD. | Less suitable for ultra-low-power battery systems requiring sub-µA retention modes. | Prefer ST3222EBTR where <5 µA shutdown is mandatory; MAX3222ESE+ acceptable if board-level leakage dominates. |
| SP3222ET-L | Lower ESD rating (±10 kV HBM); same TSSOP20 footprint and 3–5.5 V operation. | Not recommended for uncontrolled environments like retail floors or medical labs with frequent static discharge. | Select ST3222EBTR where certified ±15 kV HBM protection is required by safety or regulatory standards. |
Compared with MAX3222ESE+ and SP3222ET-L, the ST3222EBTR uniquely delivers 1 µA shutdown current with full ±15 kV HBM protection in TSSOP20-making it optimal for battery-critical and ESD-sensitive deployments where both metrics are simultaneously constrained.
Availability
ST3222EBTR is available at Aetrix Electronics and suitable for industrial modem interfaces, portable diagnostic equipment, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ST3222EBTR 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The ST3222EBTR belongs to ST's RS-232 interface product line, engineered specifically for low-voltage, low-power, high-ESD-resilience serial communication in portable and harsh-environment embedded systems.
FAQ
What is the minimum external capacitor value required for stable operation at 3.3 V?
The ST3222EBTR requires four 0.1 µF ceramic capacitors (C1–C4) for stable 3.3 V operation, as specified in Table 11 of the datasheet. These must be X7R or better dielectric, placed within 5 mm of the respective pins. Using smaller values risks charge pump instability and reduced output voltage margin under load.
Can the receivers remain active while transmitters are disabled?
Yes. When SHDN = high (VCC), transmitters and charge pump are disabled, but receivers stay fully operational if EN = low. This consumes only 1 µA total supply current and allows continuous monitoring of incoming RS-232 signals-ideal for wake-on-ring functionality in modems.
Does the ST3222EBTR support automatic direction control like half-duplex RS-485 devices?
No. The ST3222EBTR is a full-duplex RS-232 transceiver with fixed, independent transmitter and receiver channels. It lacks auto-direction sensing circuitry or DE/RE control pins. Direction management must be handled externally by the host MCU via separate TX/RX enable logic.
Is the TSSOP20 package RoHS and REACH compliant?
Yes. The ST3222EBTR uses ST's ECOPACK®-certified TSSOP20 package, which is lead-free, RoHS-compliant, and meets REACH SVHC requirements. The "ECOPACK" marking appears on the package body and inner reel box label per JEDEC JESD97 standard.
ST3222EBTR 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
ST3222EBTR FAQ
1.How can I place an order for ST3222EBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST3222EBTR 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 ST3222EBTR reliable?
The price and inventory of ST3222EBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST3222EBTR is usually 5 days.
3.What payment methods are accepted for ST3222EBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST3222EBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST3222EBTR?
ST3222EBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST3222EBTR 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 ST3222EBTR?
For technical support, including ST3222EBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST3222EBTR requirements.
6.How does Aetrix verify that ST3222EBTR is sourced from the original manufacturer or authorized distributors?
All ST3222EBTR 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 ST3222EBTR meets industry standards.
7.What is the process for return or replacement of ST3222EBTR?
All ST3222EBTR units undergo pre-shipment inspection (PSI). If there is an issue with ST3222EBTR, 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 ST3222EBTR part is unused and in its original packaging.
Return procedure for ST3222EBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST3222EBTR Tags
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