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MAX3232ESE+

3.0-5.5V RS-232 transceiver, 2Tx/2Rx, 1Mbps, ±15kV ESD, SOIC-16, 4x0.1µF caps

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Manufacturer Part：

MAX3232ESE+

Package：

SOIC-16 (narrow)

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Description

Product Overview

The MAX3232ESE+ is a 3.0V to 5.5V, 1 Mbps, dual-channel RS-232 transceiver from Analog Devices (formerly Maxim Integrated) with enhanced ±15 kV ESD protection. It features 2 drivers and 2 receivers, requires only four 0.1 µF charge pump capacitors, and is housed in a 16-pin narrow SOIC package for industrial temperature operation.

Key Specifications

  • Supply Voltage: 3.0V ~ 5.5V (single supply)
  • Data Rate: Up to 1 Mbps
  • Drivers: 2
  • Receivers: 2
  • ESD Protection: ±15 kV HBM on RS-232 pins
  • Guaranteed Slew Rate: 24 V/µs minimum
  • Supply Current: 1 mA typical (no load)
  • Shutdown Current: 1 µA max
  • Charge Pump Capacitors: 4 x 0.1 µF
  • Operating Temperature: -40°C ~ +85°C
  • Package: SOIC-16 (narrow, 150 mil)
  • Pin-compatible with MAX232/MAX242

Features

  • ±15 kV ESD protection on all RS-232 I/O pins (IEC 1000-4-2)
  • Single 3.0V to 5.5V supply operation
  • Low-power shutdown mode (1 µA max)
  • Only four external 0.1 µF capacitors needed
  • Pin-compatible with industry-standard MAX232/242
  • 3-state driver and receiver outputs
  • Meets all RS-232D and V.28 specifications
  • Receive inputs tolerant to ±25V

Applications

  • Battery-powered RS-232 communication
  • Handheld devices and PDAs
  • Notebook computer serial ports
  • Industrial control and instrumentation
  • Point-of-sale terminals

The MAX3232ESE+ from Analog Devices is a 3.0V to 5.5V powered RS-232 transceiver that integrates 2 drivers and 2 receivers with enhanced ±15 kV ESD protection on all RS-232 interface pins. The device uses an on-chip charge pump to generate the ±5.5V supplies needed for RS-232 output levels from a single 3.0V to 5.5V supply, requiring only four 0.1 µF external capacitors. The ESE+ suffix indicates narrow SOIC-16 package with industrial temperature range. The device supports data rates up to 1 Mbps and is pin-compatible with the industry-standard MAX232, enabling easy upgrades in existing 5V designs to 3V operation.

The MAX3232ESE+ uses an internal charge pump (voltage inverter and doubler) to generate the positive and negative supply rails required for RS-232 output levels from a single low-voltage supply. The charge pump operates at a fixed frequency and uses four external 0.1 µF capacitors for charge storage and transfer. Each driver converts TTL/CMOS logic levels (0 to VCC) to RS-232 levels (typically ±5.5V) using the generated dual supplies. Each receiver converts RS-232 input levels (±3V to ±15V) to TTL/CMOS logic levels using a threshold comparator with hysteresis for noise immunity. The ESD protection structures on the RS-232 pins clamp voltage transients to safe levels, protecting the internal circuitry from damage during handling and system-level ESD events.

Pin Name Function
1 C1+ Charge pump capacitor C1 positive
2 V+ Charge pump output (+5.5V generated)
3 C1- Charge pump capacitor C1 negative
4 C2+ Charge pump capacitor C2 positive
5 C2- Charge pump capacitor C2 negative
6 V- Charge pump output (-5.5V generated)
7 DOUT2 Driver 2 RS-232 output
8 RIN2 Receiver 2 RS-232 input
9 ROUT2 Receiver 2 TTL/CMOS output
10 DIN2 Driver 2 TTL/CMOS input
11 DIN1 Driver 1 TTL/CMOS input
12 ROUT1 Receiver 1 TTL/CMOS output
13 RIN1 Receiver 1 RS-232 input
14 DOUT1 Driver 1 RS-232 output
15 GND Ground
16 VCC Power supply (3.0V to 5.5V)

The MAX3232ESE+ is the go-to RS-232 transceiver for 3.3V microcontroller designs that need serial communication with legacy RS-232 equipment. In industrial instrumentation, it enables communication between modern low-voltage MCU boards and PLCs or HMI panels with RS-232 ports. For handheld devices, the low supply current and shutdown mode extend battery life. The ±15 kV ESD protection is critical in applications where cables are frequently connected and disconnected, such as point-of-sale terminals and diagnostic ports. The minimal external component count (4 capacitors) simplifies PCB layout and reduces BOM cost.

Model Manufacturer Key Difference
MAX3232CSE+ Analog Devices 0-70°C commercial temp range
SP3232ECP-L MaxLinear Pin-compatible alternative
ST3232EBPR STMicroelectronics Similar spec, different vendor
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Service & Packaging

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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