MAX238EWG+

Overview

The MAX238EWG+ is a multichannel RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It integrates four drivers and four receivers within a single chip, supporting full-duplex communication at data rates up to 120 kbps. The device operates on a single +5 V power supply with a typical operating current of 15 mA. It features a propagation delay of 10 µs and includes 500 mV hysteresis on the receivers for noise immunity. The component is housed in a 24-SOIC package (0.295 inch width) and supports surface-mount installation. It functions without an external shutdown mode and lacks integrated ESD protection circuitry.

Feature Summary

• Integrates four independent drivers and four receivers for comprehensive serial communication interfaces
• Operates exclusively from a single +5 V power supply eliminating the need for dual voltage rails
• Provides receiver input hysteresis to enhance signal integrity in noisy environments

Applications

• EIA/TIA-232E communications interfaces
• V.28/V.24 serial data transmission systems
• Industrial equipment requiring isolated serial connectivity

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix indicates the SOIC-24 package variant. Check for RoHS compliance documentation as required by regional regulations. Ensure the absence of ESD protection aligns with system design requirements. Validate that the single +5 V supply constraint fits the target application power architecture.

Selection Notes

Select this component when designing systems limited to a single +5 V rail without access to negative voltages. The 120 kbps speed suits standard asynchronous serial links where higher throughput is unnecessary. Consider the lack of built-in ESD protection if the interface connects to external connectors exposed to handling. The 24-pin SOIC footprint requires adequate PCB space for thermal management and trace routing.

Part Context

This part belongs to the MAX220–MAX249 family of line drivers and receivers designed for applications where ±12 V supplies are unavailable. These devices provide a compact solution for replacing discrete transistor-based RS-232 circuits. The family shares common architectural principles but varies in channel count and package options to suit different density requirements.

Replacement Considerations

The MAX238CNG+ serves as a pin-compatible alternative in a DIP package. Verify that the package change does not impact mechanical constraints. Other family members like the MAX232 offer similar functionality but may differ in driver/receiver counts or performance specifications.