STMicroelectronics

ST3232EBDR - 3.3V RS-232 Transceiver, 15kV ESD | STMicroelectronics

Name: ST3232EBDR
Brand: STMicroelectronics
Price: 1.25 USD
Availability: InStock

MPN: ST3232EBDR ✓ Active

In Stock (99,999) Ships in 1-3 business days

3.0 V to 5.5 V Vdss 1 uA Id SOIC-16 Package

$1.25 USD / Unit

MOQ: 1 |

Volume Pricing

Qty	Unit Price	Extended
1	$1.25	$1.25
10	$1.1	$11.00
100	$0.95	$95.00
500	$0.85	$425.00
1,000	$0.75	$750.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for ST3232EBDR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

ST3232CDR

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📦 SOIC-16

Lower ESD protection (2kV vs 15kV)

📋 Reference alternative (not in catalog)

ST3232BDR

✅ Drop-In

STMicroelectronics

📦 SOIC-16

2 · 2 · 3.0 V to 5.5 V · 400 kbps · ±15 kV HBM · 10 kΩ · 1 µA · 0.1 µF

✓ 99,999 In Stock

$0.75 / Unit

View Datasheet →

MAX3232EUE+

✅ Drop-In

📦 SOIC-16

Cross-brand, similar specs, 15kV ESD

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SP3232EEY

✅ Drop-In

📦 SOIC-16

Cross-brand, similar specs, 15kV ESD

📋 Reference alternative (not in catalog)

ADM3232EARZ

✅ Drop-In

📦 SOIC-16

Cross-brand, similar specs, 15kV ESD

📋 Reference alternative (not in catalog)

ST3232EBDR Maximum Ratings & Electrical Characteristics

Number of Drivers	2
Number of Receivers	2
Supply Voltage	3.0 V to 5.5 V
Data Rate	400 kbps
ESD Protection	15 kV (HBM)
Shutdown Current	1 uA
Operating Temperature	-40C to +85C
Package	SOIC-16
Mounting Type	Surface Mount
Charge Pump Capacitors	4 x 0.1 uF
RS-232 Output Voltage Swing	±5.5 V
Receiver Input Voltage Range	-30 V to +30 V
Supply Current (Operating)	0.3 mA (typ)
RoHS Status	Compliant
MSL Level	1

ST3232EBDR Pin Configuration

Pin 1	C1+ — Charge pump capacitor positive terminal
Pin 2	V+ — Positive charge pump output
Pin 3	C1- — Charge pump capacitor negative terminal
Pin 4	C2+ — Charge pump capacitor positive terminal
Pin 5	C2- — Charge pump capacitor negative terminal
Pin 6	V- — Negative charge pump output
Pin 7	T2OUT — Transmitter 2 output
Pin 8	R2IN — Receiver 2 input
Pin 9	R2OUT — Receiver 2 output
Pin 10	T2IN — Transmitter 2 input
Pin 11	T1IN — Transmitter 1 input
Pin 12	R1OUT — Receiver 1 output
Pin 13	R1IN — Receiver 1 input
Pin 14	T1OUT — Transmitter 1 output
Pin 15	GND — Ground
Pin 16	VCC — Power supply (3.0V to 5.5V)

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

ST3232EBDR is suitable for 6 applications: Industrial Automation, Point-of-Sale Terminals, Portable Instrumentation, Networking Equipment, Medical Devices, Consumer Electronics.

🏭

Industrial Automation

The ST3232EBDR provides reliable RS-232 communication between PLCs, sensors, and industrial controllers. Its 15kV ESD protection ensures robustness in factory environments with electrical noise. The wide operating temperature range of -40°C to +85°C allows operation in harsh conditions. The device's low shutdown current of 1 uA is beneficial for energy-efficient systems. In a typical setup, the ST3232EBDR is placed between a microcontroller's UART and an RS-232 connector, with charge pump capacitors (0.1 uF) on pins 1-4 and 6. The shutdown pin can be tied to a GPIO for power management. Compared to optocouplers, the ST3232EBDR offers a simpler, lower-cost solution for serial communication over short distances.

Recommended

STM32F103C8T6 · STMicroelectronics STM32F103C8T6 · STMicroelectronics SN65HVD72 (RS-485 transceiver for alternative bus)

💳

Point-of-Sale Terminals

The ST3232EBDR is used in POS terminals to interface with barcode scanners, receipt printers, and customer displays. Its 400 kbps data rate supports high-speed transactions, and the 3.3V operation is compatible with modern POS processors. The integrated charge pump eliminates the need for a negative supply rail, simplifying the power design. In a POS system, the ST3232EBDR connects the main processor's UART to the RS-232 ports for peripherals. The shutdown mode can be used to save power when the terminal is idle. The device's small SOIC-16 package fits well on compact POS motherboards. Compared to USB interfaces, RS-232 remains a cost-effective choice for legacy peripherals.

Recommended

STM32F407VGT6 · STMicroelectronics MCP2200 (USB-to-UART bridge for alternative interface)

📱

Portable Instrumentation

The ST3232EBDR is ideal for battery-powered portable instruments such as multimeters and data loggers. Its low shutdown current of 1 uA extends battery life, and the 3.3V supply matches common battery voltages. The device's ESD protection ensures reliability in field use. In a portable instrument, the ST3232EBDR provides a serial interface for data download to a PC. The shutdown pin can be controlled by the microcontroller to enter low-power mode when not in use. The charge pump capacitors are small and require minimal PCB area. Compared to USB, RS-232 is simpler for point-to-point communication and does not require protocol negotiation.

Recommended

STM32L432KC (Low-power microcontroller) BQ25120 (Battery charger for power management)

🌐

Networking Equipment

The ST3232EBDR is used in networking equipment such as routers and switches for console ports and management interfaces. Its 400 kbps data rate is sufficient for console communication, and the 3.3V operation is compatible with networking SoCs. The device's ESD protection is crucial for ports that may be exposed to static discharge. In a router, the ST3232EBDR connects the SoC's UART to an RJ-45 console port. The shutdown pin can be used to disable the interface when not needed. The SOIC-16 package is suitable for high-density PCBs. Compared to Ethernet, RS-232 provides a simple, low-cost management interface.

Recommended

MT7621A (Networking SoC with UART) W5500 (Ethernet controller for alternative interface)

💊

Medical Devices

The ST3232EBDR is used in medical devices such as patient monitors and diagnostic equipment for serial communication. Its reliability and ESD protection are essential in medical environments. The wide temperature range and low power consumption make it suitable for portable medical devices. In a patient monitor, the ST3232EBDR transmits vital signs data to a central station via RS-232. The shutdown mode helps conserve battery power in portable monitors. The device's small footprint is advantageous for compact medical devices. Compared to wireless interfaces, RS-232 offers a secure, interference-free connection.

Recommended

STM32F103RBT6 (Microcontroller for data acquisition) AD8232 (ECG front-end for vital sign monitoring)

📺

Consumer Electronics

The ST3232EBDR is used in consumer electronics such as set-top boxes and gaming consoles for serial debugging and peripheral interfaces. Its low cost and small package make it ideal for high-volume production. The 3.3V operation is compatible with consumer SoCs. In a set-top box, the ST3232EBDR provides a debug UART for firmware development. The shutdown pin can be used to save power in standby mode. The device's ESD protection ensures reliability in consumer environments. Compared to USB, RS-232 is simpler and does not require licensing fees.

Recommended

AML8726-MX (Application processor with UART) FT232RL (USB-to-UART bridge for alternative interface)

Recommended Products Summary

STM32F103C8T6 STMicroelectronics Used in: Industrial Automation, Industrial Automation SN65HVD72 RS-485 transceiver for alternative bus Used in: Industrial Automation STM32F407VGT6 STMicroelectronics Used in: Point-of-Sale Terminals MCP2200 USB-to-UART bridge for alternative interface Used in: Point-of-Sale Terminals STM32L432KC Low-power microcontroller Used in: Portable Instrumentation BQ25120 Battery charger for power management Used in: Portable Instrumentation MT7621A Networking SoC with UART Used in: Networking Equipment W5500 Ethernet controller for alternative interface Used in: Networking Equipment STM32F103RBT6 Microcontroller for data acquisition Used in: Medical Devices AD8232 ECG front-end for vital sign monitoring Used in: Medical Devices AML8726-MX Application processor with UART Used in: Consumer Electronics FT232RL USB-to-UART bridge for alternative interface Used in: Consumer Electronics

What is the supply voltage range of ST3232EBDR?

The ST3232EBDR operates from a supply voltage range of 3.0V to 5.5V. According to the STMicroelectronics datasheet, this allows the device to be used in both 3.3V and 5V systems, providing flexibility in mixed-voltage designs.

What is the data rate of ST3232EBDR?

The ST3232EBDR supports data rates up to 400 kbps. This is sufficient for standard RS-232 communication at typical baud rates such as 115200 bps, with ample margin for higher-speed applications.

Does ST3232EBDR have ESD protection?

Yes, the ST3232EBDR features 15kV ESD protection on the RS-232 pins, compliant with IEC 61000-4-2. This ensures robustness in industrial environments where electrostatic discharge is a concern.

What is the shutdown current of ST3232EBDR?

The shutdown current of ST3232EBDR is 1 uA (typical). This low quiescent current makes it ideal for battery-powered applications where power conservation is critical.

What package is ST3232EBDR available in?

The ST3232EBDR is available in an SOIC-16 package. This surface-mount package is widely used and suitable for automated assembly, offering a compact footprint for space-constrained PCBs.

Where can I buy ST3232EBDR online?

ST3232EBDR can be purchased from major distributors such as DigiKey and Mouser. As of 2026-08-08, the price for a single unit is approximately $1.25, with volume discounts available for larger quantities.

What is the price of ST3232EBDR?

As of 2026-08-08, the price of ST3232EBDR is approximately $1.25 for a single unit, $0.95 for 100 units, and $0.75 for 1000 units. Prices may vary by distributor and quantity.

What is the lead time for ST3232EBDR?

The lead time for ST3232EBDR is typically 2-4 weeks from major distributors, depending on stock availability. For urgent requirements, check current stock levels on DigiKey or Mouser.

Is ST3232EBDR in stock?

As of 2026-08-08, ST3232EBDR is generally in stock at major distributors like DigiKey and Mouser. However, stock levels can fluctuate, so it is recommended to check the distributor's website for real-time availability.

ST3232EBDR vs MAX3232 - which is better for 3.3V RS-232?

Both ST3232EBDR and MAX3232 are 3.3V RS-232 transceivers with similar specifications. The ST3232EBDR offers 15kV ESD protection, while the MAX3232 typically offers 15kV as well. The ST3232EBDR has a slightly higher data rate of 400 kbps compared to MAX3232's 250 kbps. For most applications, either is suitable, but the ST3232EBDR may be preferred for higher-speed communication.

What is the difference between ST3232EBDR and ST3232CDR?

The ST3232EBDR and ST3232CDR are both RS-232 transceivers from STMicroelectronics. The main difference is that the ST3232EBDR has enhanced ESD protection of 15kV, while the ST3232CDR has 2kV ESD protection. The ST3232EBDR is recommended for applications requiring higher ESD robustness.

When should I choose ST3232EBDR over MAX3232?

Choose ST3232EBDR over MAX3232 when you need higher data rates (400 kbps vs 250 kbps) or when you prefer STMicroelectronics' reliability and support. The ST3232EBDR also offers a wider supply voltage range (3.0V to 5.5V) compared to MAX3232's 3.0V to 5.5V, which is similar. For most applications, both are interchangeable, but the ST3232EBDR provides a slight edge in data rate.

Is ST3232EBDR suitable for industrial applications?

Yes, the ST3232EBDR is suitable for industrial applications due to its wide operating temperature range of -40°C to +85°C and 15kV ESD protection. It can reliably communicate in harsh environments with electrical noise and ESD events.

What is the best drop-in replacement for ST3232EBDR?

The best drop-in replacement for ST3232EBDR is the MAX3232EUE+ from Maxim Integrated, which is pin-compatible and offers similar specifications. Other options include the SP3232EEY from MaxLinear and the ADM3232EARZ from Analog Devices, both in SOIC-16 packages.

Can MAX3232 replace ST3232EBDR?

Yes, the MAX3232 can replace ST3232EBDR in most applications, as it is pin-compatible and operates over the same supply voltage range. However, the ST3232EBDR offers a higher data rate (400 kbps vs 250 kbps) and similar ESD protection, so verify that the MAX3232 meets your data rate requirements.

Where to download ST3232EBDR datasheet PDF?

The ST3232EBDR datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/st3232e.pdf. It contains detailed specifications, pinout, and application information.

Where to find ST3232EBDR pinout?

The ST3232EBDR pinout is available in the datasheet on page 3. The SOIC-16 package has pins for VCC, GND, T1IN, T1OUT, R1IN, R1OUT, T2IN, T2OUT, R2IN, R2OUT, and shutdown (SHDN). Refer to the datasheet for the complete pinout diagram.

Hey Google, what can replace ST3232EBDR?

The ST3232EBDR can be replaced by the MAX3232EUE+ from Maxim Integrated, the SP3232EEY from MaxLinear, or the ADM3232EARZ from Analog Devices. All are pin-compatible SOIC-16 RS-232 transceivers with similar specifications.

Is ST3232EBDR the same as MAX3232?

No, ST3232EBDR and MAX3232 are not the same, but they are functionally equivalent. Both are dual RS-232 transceivers with similar pinouts and specifications. The ST3232EBDR has a higher data rate (400 kbps) compared to MAX3232 (250 kbps), and both offer 15kV ESD protection.

What are the key specifications of ST3232EBDR that engineers should know?

The key specifications of ST3232EBDR include a supply voltage range of 3.0V to 5.5V, data rate up to 400 kbps, 15kV ESD protection, shutdown current of 1 uA, and operating temperature range of -40°C to +85°C. It is housed in an SOIC-16 package and is RoHS compliant.

Engineering reference data for ST3232EBDR — comparison, design guidance, and compliance information.

Selection Guide

Choose the ST3232EBDR when you need a reliable RS-232 transceiver with 15kV ESD protection and a data rate of 400 kbps. It is ideal for industrial, medical, and portable applications where robustness and low power consumption are critical. If you do not require high ESD protection, the ST3232CDR is a lower-cost alternative. For cross-brand options, the MAX3232EUE+ and SP3232EEY are pin-compatible and offer similar performance, but the ST3232EBDR provides a higher data rate than the MAX3232EUE+. The ADM3232EARZ offers a slightly higher data rate of 460 kbps, but the ST3232EBDR is more widely available and cost-effective. For most applications, the ST3232EBDR is the best balance of performance, protection, and price.

Comparison with Alternatives

Parameter	This Product	ST3232CDR	MAX3232EUE+	SP3232EEY	ADM3232EARZ
Package	SOIC-16	SOIC-16	SOIC-16	SOIC-16	SOIC-16
Brand	STMicroelectronics	STMicroelectronics	Maxim Integrated	MaxLinear	Analog Devices
Supply Voltage Range	3.0V to 5.5V	3.0V to 5.5V	3.0V to 5.5V	3.0V to 5.5V	3.0V to 5.5V
Data Rate	400 kbps	400 kbps	250 kbps	250 kbps	460 kbps
ESD Protection	15 kV	2 kV	15 kV	15 kV	15 kV
Shutdown Current	1 uA	1 uA	1 uA	1 uA	1 uA
Operating Temperature	-40C to +85C	-40C to +85C	-40C to +85C	-40C to +85C	-40C to +85C
Number of Drivers/Receivers	2/2	2/2	2/2	2/2	2/2

Key Differentiators

Higher data rate of 400 kbps (vs MAX3232EUE+)
15kV ESD protection (vs ST3232CDR)
Wide supply voltage range (vs ADM3232EARZ)

Design Notes

Place the charge pump capacitors (C1, C2) as close to the ST3232EBDR as possible to minimize parasitic inductance and ensure stable voltage generation. Use 0.1 uF ceramic capacitors with low ESR. Also place a 0.1 uF decoupling capacitor on the VCC pin. Keep the RS-232 lines away from high-speed digital traces to reduce crosstalk.

The ST3232EBDR operates from a 3.0V to 5.5V supply. Ensure the supply is clean and well-regulated. The charge pump generates ±5.5V internally, so no external negative supply is needed. The shutdown pin can be used to reduce current consumption to 1 uA when the transceiver is idle, which is beneficial for battery-powered designs.

Do not exceed the absolute maximum ratings, including supply voltage and input voltages on the RS-232 pins. The receiver inputs can handle up to ±30V, but the transmitter outputs should not be shorted to ground for extended periods. Ensure the shutdown pin is properly driven to avoid unintended shutdown. Also, verify that the data rate does not exceed 400 kbps to maintain signal integrity.