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

STMicroelectronics ST3232EBTR

Name: ST3232EBTR
Brand: STMicroelectronics
SKU: ST3232EBTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST3232EBTR

Manufacturer:: STMicroelectronics

Category:: Drivers, Receivers, Transceivers

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: ST3232EBTR.pdf

Description:: IC TRANSCEIVER FULL 2/2 16TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ST3232EBTR from STMicroelectronics is a ±15 kV ESD-protected, 3–5.5 V low-power RS-232 transceiver IC with two drivers and two receivers, guaranteed 250 kbps data rate and 6 V/µs minimum slew rate, used in battery-powered handheld and peripheral interfaces.

For engineers reviewing the ST3232EBTR datasheet, ST3232EBTR pinout, ST3232EBTR application, or ST3232EBTR equivalent, this device supports robust serial communication in space-constrained, low-voltage embedded systems where ESD resilience and supply flexibility are critical selection criteria.

Technical Context

The ST3232EBTR implements dual charge-pump voltage conversion to generate ±V_CC-derived RS-232 output levels (±5.4 V) from a single 3–5.5 V supply, eliminating need for external ±12 V rails. Its proprietary low-dropout transmitter stage maintains full RS-232 compliance down to 3 V.

It features TTL/CMOS-compatible logic inputs with hysteresis (0.25 V), receiver input thresholds adjustable by V_CC (e.g., 0.6–1.5 V low, 1.4–2.4 V high), and guaranteed 50 ns receiver enable/disable timing - enabling fast, deterministic interface control in real-time serial links.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3 V to 5.5 V - operates directly from Li-ion, 3.3 V LDO, or 5 V USB power without level-shifting.
ESD Protection	±15 kV HBM / ±8 kV IEC 1000-4-2 contact - protects I/O pins against handling and system-level ESD events.
Data Rate	250 kbps minimum guaranteed - supports full-speed RS-232 operation including modem handshaking and legacy industrial protocols.
Slew Rate	6 V/µs minimum - limits electromagnetic emissions while ensuring signal integrity on long cables up to 15 m.
Supply Current	300 µA typical at no load - enables multi-year battery life in always-on portable devices.
Receiver Input Range	±25 V - tolerates noise, ground shifts, and cable-induced transients in noisy industrial environments.
Transmitter Output Swing	±5.4 V into 3 kΩ - meets EIA/TIA-232-F specification for driver output amplitude and drive capability.

Pinout & Package

TSSOP16 package: 5.0 mm × 4.4 mm × 1.05 mm body, 0.65 mm pitch, lead-free and RoHS-compliant per ECOPACK®.

Pin/Terminal	Circuit Role	Design Meaning
1 C1+	Charge pump capacitor positive terminal	Connects to + terminal of first 0.1 µF external capacitor for voltage doubling stage.
2 V+	Doubled voltage output	Provides +2×V_CC rail for transmitter outputs; requires 0.1 µF decoupling to GND.
3 C1−	Charge pump capacitor negative terminal	Completes first charge pump loop; connects to V+ via external capacitor.
4 C2+	Second charge pump capacitor positive terminal	Connects to + terminal of second 0.1 µF capacitor for voltage inversion stage.
5 C2−	Second charge pump capacitor negative terminal	Completes second charge pump loop; connects to V− via external capacitor.
6 V−	Inverted voltage output	Provides −V_CC rail for transmitter outputs; requires 0.1 µF decoupling to GND.
7 T2OUT	Second transmitter output	RS-232-level output (±5.4 V) for secondary serial channel (e.g., RTS/CTS).
8 R2IN	Second receiver input	Accepts ±25 V RS-232 input signals (e.g., CTS, DSR); TTL/CMOS output on R2OUT.
9 R2OUT	Second receiver output	TTL/CMOS logic-level output corresponding to R2IN; drives microcontroller GPIO directly.
10 T2IN	Second transmitter input	Accepts TTL/CMOS logic input (0.8 V / 2.0 V thresholds); enables bidirectional control signaling.
11 T1IN	First transmitter input	Primary logic input for main TX line; compatible with 3.3 V or 5 V MCU I/O without level shifters.
12 R1OUT	First receiver output	Primary TTL/CMOS output for RX line; sinks 1.6 mA at 0.4 V low, sources 1 mA at V_CC−0.6 V high.
13 R1IN	First receiver input	Main RS-232 input (e.g., from DB9 connector); includes 5 kΩ typical input resistance and hysteresis.
14 T1OUT	First transmitter output	Main RS-232 driver output (±5.4 V); capable of driving 3 kΩ loads over 15 m cables.
15 GND	Ground reference	Common return for all analog and digital circuitry; must be low-impedance connection to system ground plane.
16 VCC	Positive supply input	Single 3–5.5 V supply input; bypass with 0.1 µF ceramic capacitor placed within 5 mm of pin.

Key Features

Feature	Design Value
Dual charge-pump architecture	Generates compliant ±5.4 V RS-232 outputs from 3 V supply using only four 0.1 µF capacitors - eliminates external DC/DC converters.
Low quiescent current	300 µA typical supply current enables use in always-on battery-powered devices such as barcode scanners and medical handhelds.
Guaranteed 250 kbps timing	Meets EIA/TIA-232-F data rate requirement across full temperature range (−40°C to +85°C) - ensures interoperability with legacy modems and PLCs.
Integrated ESD protection	±15 kV HBM and ±8 kV IEC 1000-4-2 on all RS-232 I/O pins - removes need for discrete TVS diodes in most end equipment designs.
Wide supply voltage range	Operates from 3 V to 5.5 V - supports direct integration with both 3.3 V microcontrollers and 5 V legacy peripherals without voltage translation.

Applications

Industrial Serial Interface

Medical Handheld Terminal

Use Scenario: Connecting PLCs, HMIs, and sensors via RS-232 in factory automation cabinets with high EMI and ground potential differences.

IC Role / Device Role / Timing Role: Dual-channel transceiver providing isolated, ESD-hardened physical layer interface between 3.3 V ARM Cortex-M controller and legacy 25-pin RS-232 equipment.

Use Value: ±25 V receiver input tolerance and 6 V/µs slew rate suppress noise coupling and ensure reliable frame reception over 10 m unshielded cables.

Use Scenario: Portable patient monitor with battery-backed UART interface to PC or printer for diagnostic report export.

IC Role / Device Role / Timing Role: Low-power RS-232 bridge converting microcontroller UART signals to standard DB9 levels while minimizing standby current draw.

Use Value: 300 µA supply current extends lithium coin-cell life beyond 3 years in sleep mode; ±15 kV ESD rating prevents field failures during clinical handling.

Point-of-Sale Peripheral

Embedded Test Equipment

Use Scenario: Compact receipt printer module integrated into retail kiosk with tight PCB area budget and shared 3.3 V rail.

IC Role / Device Role / Timing Role: Space-optimized TSSOP16 transceiver delivering full RS-232 voltage swing without external regulators or transformers.

Use Value: TSSOP16 footprint (5.0 × 4.4 mm) saves >40% board area vs SO-16; 250 kbps guarantee ensures rapid print job transmission without protocol timeouts.

Use Scenario: Automated test fixture communicating with DUTs via RS-232 for firmware update and calibration logging.

IC Role / Device Role / Timing Role: Robust physical layer interface supporting hot-plug detection, flow control (RTS/CTS), and error-free command-response cycles.

Use Value: 50 ns receiver enable/disable timing allows precise hardware handshaking; dual drivers/receivers support simultaneous command and status reporting.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3232ESE+	Same 2-driver/2-receiver configuration, ±15 kV HBM, but uses different charge-pump topology requiring 0.1 µF × 4 capacitors; 1 µA shutdown current vs ST3232EBTR's 300 µA active current.	Offers ultra-low shutdown mode for intermittent-use systems; lacks ST's guaranteed 250 kbps min spec - rated at 250 kbps typical only.	Select MAX3232ESE+ when deep-sleep current <1 µA is mandatory; otherwise ST3232EBTR provides tighter timing guarantees and broader temp range (−40°C to +85°C vs −40°C to +85°C same).
SP3232EEN-L	Pin-compatible TSSOP16 variant with identical electrical specs, but rated only to 0°C–70°C industrial range and specified for 250 kbps typical (not guaranteed).	Valid for commercial-grade applications only; not qualified for extended temperature deployments like outdoor kiosks or automotive diagnostics tools.	Choose SP3232EEN-L only for cost-sensitive, room-temperature consumer products; ST3232EBTR is required for full industrial temperature compliance and guaranteed timing.

Compared with MAX3232ESE+ and SP3232EEN-L, the ST3232EBTR uniquely delivers guaranteed 250 kbps operation across −40°C to +85°C with 300 µA active supply current - making it optimal for industrial and medical designs demanding timing certainty and wide-temperature reliability without shutdown complexity.

Availability

ST3232EBTR is available at Aetrix Electronics and suitable for industrial serial interface, medical handheld terminal, and point-of-sale peripheral applications requiring stable component supply and long-term lifecycle support.

Supply support for ST3232EBTR 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, power management ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The ST3232EBTR belongs to ST's RS-232 transceiver product line, engineered specifically for low-voltage, ESD-hardened serial communication in space- and power-constrained embedded systems.

FAQ

What is the minimum external capacitor value required for reliable operation at 3.3 V?

The ST3232EBTR requires four 0.1 µF ceramic capacitors (C1+, C1−, C2+, C2−) for stable charge-pump operation at 3.3 V. These must be X7R or better dielectric, placed within 5 mm of their respective pins, and rated for ≥10 V DC to ensure margin under ripple and temperature drift.

Does the ST3232EBTR support automatic power-down when VCC is removed?

No, the ST3232EBTR does not include an auto-power-down feature. When VCC drops below 2.7 V, transmitter outputs enter high-impedance state and receiver outputs go low, but no internal shutdown circuitry is present. External enable control or system-level power sequencing is required for true low-leakage isolation.

Can the ST3232EBTR drive standard RS-232 cables longer than 15 meters?

The ST3232EBTR is characterized for reliable operation up to 15 m with standard 3 kΩ load and 1000 pF capacitance. Beyond that distance, signal integrity degrades due to attenuation and skew; for longer runs, use RS-422/485 transceivers or add line drivers - the ST3232EBTR's 6 V/µs slew rate is optimized for shorter, noise-prone interconnects.

Is the TSSOP16 package of ST3232EBTR lead-free and RoHS-compliant?

Yes, the ST3232EBTR in TSSOP16 packaging is fully RoHS-compliant and lead-free, manufactured per ST's ECOPACK®2 specifications. The device carries the "E" grade marking and conforms to JEDEC J-STD-020 moisture sensitivity level 3 (MSL3), requiring bake prior to reflow if exposed to ambient >12 months.

ST3232EBTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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:: 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:: 16-TSSOP

ST3232EBTR FAQ

1.How can I place an order for ST3232EBTR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST3232EBTR 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 ST3232EBTR reliable?

The price and inventory of ST3232EBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST3232EBTR is usually 5 days.

3.What payment methods are accepted for ST3232EBTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST3232EBTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST3232EBTR?

ST3232EBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST3232EBTR 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 ST3232EBTR?

For technical support, including ST3232EBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST3232EBTR requirements.

6.How does Aetrix verify that ST3232EBTR is sourced from the original manufacturer or authorized distributors?

All ST3232EBTR 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 ST3232EBTR meets industry standards.

7.What is the process for return or replacement of ST3232EBTR?

All ST3232EBTR units undergo pre-shipment inspection (PSI). If there is an issue with ST3232EBTR, 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 ST3232EBTR part is unused and in its original packaging.

Return procedure for ST3232EBTR:

1.Submit a request within 90 days.

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

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