ADM1181AARWZ-REEL

Overview

The ADM1181AARWZ-REEL is a dual-channel RS-232 transceiver manufactured by Analog Devices Inc. It operates from a single 5 V power supply (4.5 V to 5.5 V) and supports data rates up to 230 kbps. The device features ±15 kV ESD protection on all I/O lines, complying with IEC1000-4-2 standards. It includes an internal charge-pump voltage converter requiring four external 0.1 µF capacitors. The component is housed in a 16-lead SOIC package and functions as a robust upgrade for legacy MAX202E and LT1181A interfaces.

Feature Summary

• Compliant with EU EMC directive 89/336/EEC for low emissions and high immunity
• Integrated charge-pump DC-to-DC converter eliminates need for external negative voltage supplies
• Schmitt-trigger receiver inputs provide noise immunity and hysteresis
• Internal pull-down resistors ensure defined logic states for unconnected inputs

Applications

• General-purpose RS-232 data links
• Portable instruments requiring low power consumption
• PDAs and handheld devices
• ISDN modem standards supporting high baud rates

Procurement Notes

Verify the REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the specific revision level matches design requirements, as datasheet revisions may update specifications or ordering information. Ensure compatibility with existing PCB footprints for the 16-lead SOIC package.

Selection Notes

Select this component for applications requiring high ESD tolerance and EMC compliance without external shielding. It serves as a direct pin-compatible replacement for MAX202E and LT1181A devices. Consider the internal charge-pump current limitations when driving heavy capacitive loads at maximum data rates.

Part Context

The ADM1181A belongs to the ADM202E/ADM1181A family of RS-232 line drivers and receivers. This series was designed to replace older generation interface chips while offering improved electromagnetic compatibility and higher transmission speeds. The A variant denotes industrial temperature range operation.

Replacement Considerations

Confirmed pin-compatible replacements include MAX202E and LT1181A. Verify that substitute components support the required 230 kbps data rate and ±15 kV ESD protection levels to maintain system reliability in harsh electrical environments.