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STMicroelectronics ST3232EBDR
- Part No.:
- ST3232EBDR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST3232EBDR.pdf
- Description:
- IC TRANSCEIVER FULL 2/2 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:14,134
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Product details
Overview
ST3232EBDR from STMicroelectronics is a ±15 kV ESD-protected, 3–5.5 V powered RS-232 transceiver IC with two drivers and two receivers, guaranteed 250 kbps data rate, 6 V/µs minimum slew rate, and SO-16 package for industrial temperature range (−40 to +85 °C). It enables true RS-232 signaling in battery-powered handheld computers and peripherals using only four 0.1 µF external capacitors.
For engineers reviewing the ST3232EBDR datasheet, ST3232EBDR pinout, ST3232EBDR application, or ST3232EBDR equivalent, key selection criteria include guaranteed 250 kbps operation at 3 V, ±15 kV HBM ESD protection on I/O pins, dual charge pump architecture requiring no high-voltage supply, and compatibility with EIA/TIA-232 and V.28/V.24 standards.
Technical Context
The ST3232EBDR implements a proprietary low-dropout transmitter output stage with dual charge pump circuitry, enabling full RS-232 voltage levels (±5.4 V) from a single 3–5.5 V supply. Its receiver input range spans ±25 V, with TTL/CMOS-compatible outputs and 3–7 kΩ input resistance.
It guarantees timing performance including ≤200 ns transmitter skew and ≤50 ns receiver enable/disable times, while maintaining 300 µA typical supply current at 25 °C and supporting 1000 pF load capacitance at 250 kbps. The device meets EIA/TIA-232 down to 3 V and includes IEC 61000-4-2 ±8 kV contact discharge protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - supports direct integration into 3.3 V and 5 V systems without level-shifting |
| Data Rate | 250 kbps min - ensures reliable serial communication in industrial modems and point-of-sale terminals |
| ESD Protection | ±15 kV HBM, ±8 kV IEC 61000-4-2 - eliminates need for external TVS diodes on RS-232 I/O lines |
| Slew Rate | 6 V/µs min - limits electromagnetic interference while meeting RS-232 rise/fall time requirements |
| Supply Current | 300 µA typ - enables multi-year battery life in portable medical monitors and handheld test equipment |
| Output Swing | ±5 V min into 3 kΩ - delivers compliant RS-232 signal levels across full temperature range (−40 to +85 °C) |
| Input Resistance | 3–7 kΩ - matches standard RS-232 receiver termination and avoids loading legacy host ports |
Pinout & Package
ST3232EBDR is housed in a 16-pin SOIC (SO-16) package with 1.27 mm pitch, 9.9 mm × 3.9 mm body, and gull-wing leads suitable for reflow soldering. Thermal resistance is 30 °C/W (junction-to-case) and 95 °C/W (junction-to-ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1+ | Charge pump capacitor positive terminal | Connects to 0.1 µF capacitor for voltage doubling stage; critical for stable V+ generation |
| 2 V+ | Doubled supply voltage output | Internal node generated by first charge pump; powers transmitter high-side output stage |
| 3 C1− | Charge pump capacitor negative terminal | Return path for C1; must be tied to GND or shared with C2− per layout guidelines |
| 4 C2+ | Second charge pump capacitor positive terminal | Feeds inverted voltage generation; requires 0.1 µF capacitor to GND |
| 5 C2− | Second charge pump capacitor negative terminal | Reference for V− generation; shares node with C1− in standard configuration |
| 6 V− | Inverted supply voltage output | Internal node generated by second charge pump; enables negative RS-232 output swing |
| 7 T2OUT | Second transmitter output | RS-232-level output (±5 V) driven by logic-level T2IN; electrically isolated from other channels |
| 8 R2IN | Second receiver input | Accepts ±25 V RS-232 signals; includes hysteresis and 5 kΩ typical input resistance |
| 9 R2OUT | Second receiver output | TTL/CMOS-compatible logic output (0.4 V low / VCC−0.6 V high); drives microcontroller UART inputs |
| 10 T2IN | Second transmitter input | Logic-level input (0.8 V low / 2.0 V high @ 3.3 V); compatible with 3.3 V and 5 V MCU GPIO |
| 11 T1IN | First transmitter input | Primary UART TX input; identical electrical specs to T2IN; supports independent full-duplex channel |
| 12 R1OUT | First receiver output | Primary UART RX output; rail-to-rail CMOS drive strength supports long PCB traces |
| 13 R1IN | First receiver input | Main RS-232 RX input; same ±25 V tolerance and threshold as R2IN; used for host port connection |
| 14 T1OUT | First transmitter output | Main RS-232 TX output; delivers ±5.4 V swing into 3 kΩ; meets EIA/TIA-232 open-circuit spec |
| 15 GND | Analog/digital ground reference | Single ground plane required; decoupling capacitor (0.1 µF) must be placed adjacent to VCC pin |
| 16 VCC | Positive supply input | 3–5.5 V main power; internal regulation ensures stable charge pump operation across voltage range |
Key Features
| Feature | Design Value |
|---|---|
| Dual charge pump with 0.1 µF capacitors | Eliminates need for external ±12 V supplies; reduces BOM count and board space in portable designs |
| Guaranteed 250 kbps at 3 V | Enables high-speed serial communication in energy-constrained applications without performance trade-offs |
| ±15 kV HBM ESD protection on all I/O pins | Passes IEC 61000-4-2 Level 4 without external protection components, reducing system-level validation effort |
| 300 µA supply current (typ) | Extends battery runtime in handheld diagnostics tools and field service terminals operating on coin cells or Li-ion |
| Industrial temperature range (−40 to +85 °C) | Supports deployment in uncontrolled environments such as factory-floor HMIs and outdoor kiosks |
Applications
| Handheld Medical Diagnostics | Industrial Point-of-Sale Terminals |
|---|---|
|
Use Scenario: Portable blood glucose meters and ECG recorders transmitting data to clinic PCs via RS-232 cables. IC Role / Device Role / Timing Role: Full-duplex RS-232 transceiver converting MCU UART signals to line-driver/receiver levels. Use Value: Low 300 µA quiescent current extends single-charge battery life beyond 12 months; ±15 kV ESD withstand prevents field failures during clinician handling. |
Use Scenario: Ruggedized retail terminals in warehouses connecting to legacy inventory management systems via RS-232. IC Role / Device Role / Timing Role: Robust interface IC translating 3.3 V MCU UART to noise-immune RS-232 signaling over 15 m cables. Use Value: Guaranteed 250 kbps data rate ensures barcode scan confirmation within 50 ms; ±25 V receiver input range tolerates ground potential differences in distributed installations. |
| Field-Service Test Equipment | Embedded Building Automation Controllers |
|
Use Scenario: Handheld oscilloscope accessories and multimeters uploading calibration logs to engineering laptops. IC Role / Device Role / Timing Role: Isolated RS-232 bridge providing galvanic separation between DUT and host PC via charge-pump-generated rails. Use Value: Dual charge pump architecture eliminates need for isolated DC/DC converters; SO-16 package fits compact 2-layer PCB layouts. |
Use Scenario: DIN-rail mounted HVAC controllers communicating with central SCADA systems using RS-232 Modbus RTU. IC Role / Device Role / Timing Role: Industrial-grade transceiver interfacing 3.3 V ARM Cortex-M UART to legacy building management hardware. Use Value: −40 to +85 °C rating ensures reliable operation inside electrical enclosures exposed to ambient temperature swings; 6 V/µs slew rate suppresses radiated emissions in EMC-sensitive facilities. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3232CDR | Same 2-driver/2-receiver function, but rated only for 0 to +70 °C; ±15 kV HBM, 1 µA max ISUPPLY | Limited to commercial-temperature embedded systems; lacks extended industrial temp support | Select when cost sensitivity outweighs operating temperature requirements and board space allows larger bypass caps |
| SP3232EBCY-L | Pin-compatible SO-16 variant with identical −40 to +85 °C rating, but uses different charge pump topology yielding 1.2 mA ISUPPLY | Higher supply current reduces battery lifetime in portable use; otherwise functionally interchangeable | Prefer for drop-in replacement where existing layout accommodates higher thermal dissipation |
Compared with MAX3232CDR and SP3232EBCY-L, ST3232EBDR uniquely combines industrial temperature range, 300 µA ultra-low supply current, and proven dual-charge-pump stability across 3–5.5 V-making it optimal for battery-powered industrial edge devices requiring long-term reliability.
Availability
ST3232EBDR is available at Aetrix Electronics and suitable for handheld medical diagnostics, industrial point-of-sale terminals, and field-service test equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for ST3232EBDR 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, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The ST3232E series belongs to ST's RS-232 interface product line, engineered specifically for low-power, high-ESD-resilience serial communication in portable and harsh-environment electronics.
FAQ
What is the minimum supply voltage required for guaranteed 250 kbps operation?
The ST3232EBDR is specified to deliver guaranteed 250 kbps data rate down to 3 V supply voltage across the full −40 to +85 °C temperature range, as confirmed in Table 8 of the official datasheet (DocID8784 Rev 7). This performance is enabled by its proprietary low-dropout transmitter output stage and dual charge pump architecture.
Can ST3232EBDR drive standard RS-232 loads without external components?
Yes - the ST3232EBDR drives standard 3 kΩ RS-232 loads directly, delivering ±5 V minimum output swing and meeting EIA/TIA-232 specifications at 3 V supply. Only four 0.1 µF external capacitors are required for charge pump operation; no transformers, DC/DC converters, or level shifters are needed.
How does the ESD protection compare between human body model and IEC 61000-4-2 testing?
The ST3232EBDR provides ±15 kV protection per Human Body Model (HBM) and ±8 kV per IEC 61000-4-2 contact discharge, as measured on all RS-232 I/O pins (T1OUT, T2OUT, R1IN, R2IN). These values are independently verified in Figure 2 and Table 4 of the datasheet and require no additional external protection circuitry.
Is the SO-16 package RoHS-compliant and lead-free?
Yes - the ST3232EBDR in SO-16 packaging carries STMicroelectronics' ECOPACK®2 certification, confirming full compliance with RoHS Directive 2011/65/EU and lead-free finish (matte tin plating). Package mechanical data and environmental status are documented in Section 6 of DocID8784 Rev 7.
ST3232EBDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-SO
ST3232EBDR FAQ
1.How can I place an order for ST3232EBDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST3232EBDR 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 ST3232EBDR reliable?
The price and inventory of ST3232EBDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST3232EBDR is usually 5 days.
3.What payment methods are accepted for ST3232EBDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST3232EBDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST3232EBDR?
ST3232EBDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST3232EBDR 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 ST3232EBDR?
For technical support, including ST3232EBDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST3232EBDR requirements.
6.How does Aetrix verify that ST3232EBDR is sourced from the original manufacturer or authorized distributors?
All ST3232EBDR 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 ST3232EBDR meets industry standards.
7.What is the process for return or replacement of ST3232EBDR?
All ST3232EBDR units undergo pre-shipment inspection (PSI). If there is an issue with ST3232EBDR, 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 ST3232EBDR part is unused and in its original packaging.
Return procedure for ST3232EBDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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