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

STMicroelectronics ST232EBN

Name: ST232EBN
Brand: STMicroelectronics
SKU: ST232EBN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST232EBN

Manufacturer:: STMicroelectronics

Category:: Drivers, Receivers, Transceivers

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: ST232EBN.pdf

Description:: IC TRANSCEIVER FULL 2/2 16DIP

Quantity:: RFQ Add To RFQ list

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Inventory:2,584

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Product details

Overview

ST232EB from STMicroelectronics is a dual-driver, dual-receiver RS-232 transceiver IC operating from a single 5 V supply, featuring ±15 kV HBM ESD protection on RS-232 I/O pins, guaranteed 230 kbps data rate, and 3–30 V/µs slew rate control for noise-immune serial communication in industrial and embedded systems.

For engineers reviewing the ST232EB datasheet, ST232EB pinout, ST232EB application, or ST232EB equivalent, this device supports robust point-to-point RS-232 links in harsh environments where ESD resilience, low external component count (four 1 µF charge-pump capacitors), and wide temperature operation (–40 to +85 °C) are critical selection criteria.

Technical Context

The ST232EB integrates two independent RS-232 drivers and receivers with internal charge-pump voltage converters generating ±10 V rails from 5 V, enabling compliant RS-232 output swings of ±5 V to ±9 V. Its receiver input range spans ±30 V, supporting fault-tolerant operation under line transients.

It uses TTL/CMOS-compatible logic inputs and outputs, with defined thresholds (V_IL = 0.8 V, V_IH = 2.0 V; V_OL = 0.4 V, V_OH = 3.5 V), and exhibits propagation delays of ≤2 µs (transmitter) and ≤10 µs (receiver) under standard load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	5 V ±10% - enables direct integration into 5 V logic systems without auxiliary supplies
Data Rate	230 kbps guaranteed - supports high-speed legacy serial interfaces up to 230 kbaud
Slew Rate	3–30 V/µs - adjustable edge control reduces EMI and improves signal integrity over long cables
ESD Protection	±15 kV HBM on RS-232 I/O - eliminates need for external TVS diodes in most industrial deployments
Capacitor Requirement	Four 1 µF external capacitors - lowers BOM cost and PCB area vs. 0.1 µF alternatives
Operating Temperature	–40 to +85 °C - qualified for extended industrial ambient conditions
Receiver Input Range	±30 V - tolerates large common-mode offsets and cable-induced surges

Pinout & Package

ST232EB is available in SO16 and TSSOP16 packages; both are RoHS-compliant ECOPACK® variants. The SO16 variant has 1.27 mm pitch and 10.0 × 6.0 mm footprint; TSSOP16 offers 0.65 mm pitch and 5.0 × 6.4 mm footprint for space-constrained designs.

Pin/Terminal	Circuit Role	Design Meaning
1 C1+	Charge pump capacitor positive terminal	Connects to + terminal of first 1 µF flying capacitor for voltage doubling
2 V+	Doubled output voltage rail	Provides +10 V supply to drivers; must be decoupled to GND
3 C1−	Charge pump capacitor negative terminal	Completes first charge-pump stage; ties to GND during switching phase
4 C2+	Second charge pump capacitor positive terminal	Connects to + terminal of second 1 µF capacitor for voltage inversion
5 C2−	Second charge pump capacitor negative terminal	Completes inverting stage; referenced to V+ during operation
6 V−	Inverted output voltage rail	Provides –10 V supply to drivers; requires local decoupling
7 T2OUT	Second transmitter output	RS-232 level output (±5 V to ±9 V); drives DTE/DCE interface lines
8 R2IN	Second receiver input	Accepts ±30 V RS-232 signals; includes hysteresis for noise rejection
9 R2OUT	Second receiver output	TTL/CMOS logic-level output (0.4 V / 3.5 V) compatible with microcontrollers
10 T2IN	Second transmitter input	TTL/CMOS logic input (0.8 V / 2.0 V thresholds); connects to UART TX
11 T1IN	First transmitter input	Primary UART TX input; electrically identical to T2IN
12 R1OUT	First receiver output	Primary UART RX output; directly interfaces with MCU RX pin
13 R1IN	First receiver input	Primary RS-232 input; shares same ±30 V tolerance and hysteresis as R2IN
14 T1OUT	First transmitter output	Main RS-232 driver output; used for primary TX line (e.g., TxD)
15 GND	Analog/digital ground reference	Common return for all internal circuitry and external capacitors
16 VCC	Positive supply input	5 V power input; supplies logic core and charge pump controller

Key Features

Feature	Design Value
Integrated charge-pump voltage generator	Eliminates need for ±12 V supplies; generates compliant RS-232 levels from 5 V only
Two independent full-duplex channels	Enables simultaneous bidirectional communication on separate RS-232 lines (e.g., TxD/RxD + RTS/CTS)
Wide receiver input voltage range	±30 V tolerance allows reliable operation despite ground potential differences between connected devices
Low-power shutdown mode (not applicable)	This variant lacks enable/shutdown control; always active when powered - simplifies design but increases quiescent current
ECOPACK® environmental compliance	Meets RoHS and halogen-free requirements for industrial and medical equipment certifications

Applications

Industrial PLC Serial Port

Medical Diagnostic Equipment Interface

Use Scenario: Connecting programmable logic controllers to HMIs or SCADA gateways via RS-232 over noisy factory floors.

IC Role / Device Role / Timing Role: Dual-channel RS-232 level translator ensuring signal integrity and ESD survivability at the physical layer.

Use Value: ±15 kV ESD protection prevents field failures; 230 kbps rate supports real-time status polling without bottlenecks.

Use Scenario: Interfacing ultrasound or ECG monitors to PC-based analysis software using legacy COM ports.

IC Role / Device Role / Timing Role: Isolating sensitive analog front-end circuitry from host-side digital noise while maintaining timing-critical data flow.

Use Value: ±30 V receiver input range accommodates floating patient-ground references; 1 µF capacitor solution minimizes board space in compact enclosures.

Point-of-Sale Terminal Backchannel

Ruggedized Handheld Data Collector

Use Scenario: Enabling bi-directional firmware updates and receipt printing between POS terminals and thermal printers.

IC Role / Device Role / Timing Role: Full-duplex RS-232 transceiver handling command-response protocols with minimal latency.

Use Value: Guaranteed 230 kbps throughput ensures sub-second firmware sync; SO16 package supports automated assembly in high-volume production.

Use Scenario: Supporting barcode scanning and asset tracking in warehouses with frequent electrostatic discharge events.

IC Role / Device Role / Timing Role: Robust physical-layer interface protecting host MCU from cable-induced transients and human-hand ESD.

Use Value: TSSOP16 option enables compact handheld form factor; 3–30 V/µs slew rate tuning reduces radiated emissions in battery-powered units.

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+	Uses 0.1 µF capacitors; lower quiescent current (1 µA shutdown vs. ST232EB's always-on 5 mA typical)	Preferred where ultra-low standby power matters; less suitable for continuous operation without sleep control	Select MAX3232ESE+ if system requires power gating; ST232EB preferred for simplicity and higher ESD margin (±15 kV vs. ±15 kV HBM but ±8 kV IEC contact)
SP3232EEN-L	Guaranteed 250 kbps; wider operating temp (–40 to +125 °C); same 1 µF cap requirement	Better suited for automotive under-hood or extended-temperature industrial use cases	Choose SP3232EEN-L for >85 °C ambient; ST232EB remains optimal for cost-sensitive industrial designs within its rated range

Compared with MAX3232ESE+ and SP3232EEN-L, the ST232EB delivers superior ESD robustness at the lowest external component count for fixed 5 V systems, making it ideal for cost-driven, high-reliability industrial serial interfaces where temperature stays below 85 °C.

Availability

ST232EB is available at Aetrix Electronics and suitable for industrial PLC serial ports, medical diagnostic equipment interfaces, and point-of-sale terminal backchannels requiring stable component supply across multi-year production cycles.

Supply support for ST232EB 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 ICs, sensors, and analog/mixed-signal products for industrial, automotive, and consumer markets.

The ST232EB belongs to ST's RS-232 transceiver product line, engineered specifically for ruggedized serial communication in electrically noisy environments where reliability, ESD immunity, and minimal external components are essential.

FAQ

Does ST232EB support automatic power-down or shutdown mode?

No. The ST232EB does not include an enable or shutdown pin and operates continuously when powered. Its typical supply current is 5 mA at 25 °C with no load. For low-power applications requiring sleep states, consider alternatives like MAX3232ESE+ that integrate shutdown control.

What is the minimum and maximum load capacitance supported at 230 kbps?

The ST232EB guarantees 230 kbps operation with load capacitance ranging from 50 pF to 1000 pF and load resistance from 3 kΩ to 7 kΩ, per EIA/TIA-232E specification compliance testing. Performance remains functional beyond these limits but is not production-guaranteed.

Can ST232EB replace ST202EB in existing designs?

Yes, with capacitor change: ST232EB uses four 1 µF charge-pump capacitors versus ST202EB's four 0.1 µF units. All pin functions and electrical specs (voltage, timing, ESD) are identical. No layout revision is needed beyond capacitor value update and footprint verification for chosen package (SO16/TSSOP16).

Is ST232EB compliant with RS-232E and V.28 standards?

Yes. The ST232EB meets EIA/TIA-232E and CCITT V.28 specifications for driver output voltage swing (±5 V min), receiver input threshold (±3 V), and input impedance (≥3 kΩ), verified under standard loading conditions and across its full operating temperature range.

ST232EBN Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Type:: Transceiver

Protocol:: RS232

Number of Drivers/Receivers:: 2/2

Duplex:: Full

Receiver Hysteresis:: 500 mV

Data Rate:: 230kbps

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-DIP

ST232EBN FAQ

1.How can I place an order for ST232EBN through Aetrix?

Please submit a Request for Quotation (RFQ) for ST232EBN 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 ST232EBN reliable?

The price and inventory of ST232EBN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST232EBN is usually 5 days.

3.What payment methods are accepted for ST232EBN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST232EBN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST232EBN?

ST232EBN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST232EBN 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 ST232EBN?

For technical support, including ST232EBN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST232EBN requirements.

6.How does Aetrix verify that ST232EBN is sourced from the original manufacturer or authorized distributors?

All ST232EBN 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 ST232EBN meets industry standards.

7.What is the process for return or replacement of ST232EBN?

All ST232EBN units undergo pre-shipment inspection (PSI). If there is an issue with ST232EBN, 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 ST232EBN part is unused and in its original packaging.

Return procedure for ST232EBN:

1.Submit a request within 90 days.

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

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